XSPEC version: 12.9.0n Build Date/Time: Thu May 12 09:56:58 2016 [?1034hXSPEC12>query no XSPEC12>data 1:1 /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_repro c/trigger717500/00717500000-results/pha/sw00717500000b_peak.pha 1 spectrum in use Spectral Data File: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger717500/00717500000-results/pha/sw00717500000b_peak.pha Spectrum 1 Net count rate (cts/s) for Spectrum:1 4.143e-01 +/- 4.813e-02 Assigned to Data Group 1 and Plot Group 1 Noticed Channels: 1-80 Telescope: SWIFT Instrument: BAT Channel Type: PI Exposure Time: 1 sec Using fit statistic: chi Using test statistic: chi No response loaded. ***Warning! One or more spectra are missing responses, and are not suitable for fit. XSPEC12>response 1 /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_rep roc/trigger717500/remake_spec_cflux/spec_1speak/sw00717500000b_1speak.rsp Response successfully loaded. XSPEC12>ignore **-13.0 150.0-** 3 channels (1-3) ignored in spectrum # 1 18 channels (63-80) ignored in spectrum # 1 XSPEC12>model bbodyrad + bbodyrad Input parameter value, delta, min, bot, top, and max values for ... 3 0.01( 0.03) 0.0001 0.001 100 200 1:bbodyrad:kT>4.0000 1.00000E-02 1.00000E-04 1.00000E-03 100.00 2 00.00 1 0.01( 0.01) 0 0 1e+20 1e+24 2:bbodyrad:norm>20.000 1.00000E-02 0.0000 0.0000 1.00000E+24 1.00000E+24 3 0.01( 0.03) 0.0001 0.001 100 200 3:bbodyrad:kT>10.000 1.00000E-02 1.00000E-04 1.00000E-03 100.00 2 00.00 1 0.01( 0.01) 0 0 1e+20 1e+24 4:bbodyrad:norm>0.50000 1.00000E-02 0.0000 0.0000 1.00000E+24 1.00000E+24 ======================================================================== Model bbodyrad<1> + bbodyrad<2> Source No.: 1 Active/On Model Model Component Parameter Unit Value par comp 1 1 bbodyrad kT keV 4.00000 +/- 0.0 2 1 bbodyrad norm 20.0000 +/- 0.0 3 2 bbodyrad kT keV 10.0000 +/- 0.0 4 2 bbodyrad norm 0.500000 +/- 0.0 ________________________________________________________________________ Fit statistic : Chi-Squared = 96.56 using 59 PHA bins. Test statistic : Chi-Squared = 96.56 using 59 PHA bins. Reduced chi-squared = 1.756 for 55 degrees of freedom Null hypothesis probability = 4.553264e-04 Current data and model not fit yet. XSPEC12>fit Parameters Chi-Squared |beta|/N Lvl 1:kT 2:norm 3:kT 4:norm 66.7294 2.60258 -2 3.48660 41.9249 20.3873 0.127134 62.8126 26.2827 -2 3.03519 57.1056 16.3224 0.203432 59.7633 14.6829 -3 2.60408 106.614 16.7563 0.241441 59.4874 0.382965 -4 2.69132 127.873 16.5507 0.247813 59.4804 0.197494 -5 2.69337 122.747 16.6176 0.244148 ================================================== Variances and Principal Axes 1 2 3 4 8.4953E-04| -0.0385 -0.0001 -0.0526 -0.9979 6.2275E-02| 0.9973 0.0032 -0.0648 -0.0351 2.6180E+00| -0.0628 -0.0011 -0.9965 0.0549 3.7557E+05| -0.0033 1.0000 -0.0009 0.0001 -------------------------------------------------- ================================================ Covariance Matrix 1 2 3 4 4.142e+00 -1.236e+03 1.300e+00 -9.321e-02 -1.236e+03 3.756e+05 -3.462e+02 2.492e+01 1.300e+00 -3.462e+02 2.919e+00 -1.660e-01 -9.321e-02 2.492e+01 -1.660e-01 1.047e-02 ------------------------------------------------ ======================================================================== Model bbodyrad<1> + bbodyrad<2> Source No.: 1 Active/On Model Model Component Parameter Unit Value par comp 1 1 bbodyrad kT keV 2.69337 +/- 2.03511 2 1 bbodyrad norm 122.747 +/- 612.837 3 2 bbodyrad kT keV 16.6176 +/- 1.70855 4 2 bbodyrad norm 0.244148 +/- 0.102321 ________________________________________________________________________ Fit statistic : Chi-Squared = 59.48 using 59 PHA bins. Test statistic : Chi-Squared = 59.48 using 59 PHA bins. Reduced chi-squared = 1.081 for 55 degrees of freedom Null hypothesis probability = 3.158600e-01 XSPEC12>fit Parameters Chi-Squared |beta|/N Lvl 1:kT 2:norm 3:kT 4:norm 59.4802 0.00201488 -3 2.68376 125.185 16.5948 0.245454 ================================================== Variances and Principal Axes 1 2 3 4 8.2595E-04| -0.0364 -0.0001 -0.0516 -0.9980 6.6976E-02| 0.9972 0.0034 -0.0667 -0.0329 2.6303E+00| -0.0649 -0.0011 -0.9964 0.0539 3.7077E+05| -0.0034 1.0000 -0.0009 0.0001 -------------------------------------------------- ================================================ Covariance Matrix 1 2 3 4 4.445e+00 -1.273e+03 1.345e+00 -9.467e-02 -1.273e+03 3.708e+05 -3.436e+02 2.427e+01 1.345e+00 -3.436e+02 2.930e+00 -1.636e-01 -9.467e-02 2.427e+01 -1.636e-01 1.013e-02 ------------------------------------------------ ======================================================================== Model bbodyrad<1> + bbodyrad<2> Source No.: 1 Active/On Model Model Component Parameter Unit Value par comp 1 1 bbodyrad kT keV 2.68376 +/- 2.10843 2 1 bbodyrad norm 125.185 +/- 608.906 3 2 bbodyrad kT keV 16.5948 +/- 1.71179 4 2 bbodyrad norm 0.245454 +/- 0.100637 ________________________________________________________________________ Fit statistic : Chi-Squared = 59.48 using 59 PHA bins. Test statistic : Chi-Squared = 59.48 using 59 PHA bins. Reduced chi-squared = 1.081 for 55 degrees of freedom Null hypothesis probability = 3.158637e-01 XSPEC12>fit 100 Parameters Chi-Squared |beta|/N Lvl 1:kT 2:norm 3:kT 4:norm 59.4802 0.000886223 -3 2.68661 124.489 16.6021 0.245052 ================================================== Variances and Principal Axes 1 2 3 4 8.3394E-04| -0.0366 -0.0001 -0.0520 -0.9980 6.6621E-02| 0.9972 0.0033 -0.0665 -0.0331 2.6225E+00| -0.0646 -0.0011 -0.9964 0.0542 3.9063E+05| -0.0033 1.0000 -0.0009 0.0001 -------------------------------------------------- ================================================ Covariance Matrix 1 2 3 4 4.448e+00 -1.307e+03 1.340e+00 -9.495e-02 -1.307e+03 3.906e+05 -3.515e+02 2.499e+01 1.340e+00 -3.515e+02 2.920e+00 -1.640e-01 -9.495e-02 2.499e+01 -1.640e-01 1.022e-02 ------------------------------------------------ ======================================================================== Model bbodyrad<1> + bbodyrad<2> Source No.: 1 Active/On Model Model Component Parameter Unit Value par comp 1 1 bbodyrad kT keV 2.68661 +/- 2.10897 2 1 bbodyrad norm 124.489 +/- 624.997 3 2 bbodyrad kT keV 16.6021 +/- 1.70893 4 2 bbodyrad norm 0.245052 +/- 0.101082 ________________________________________________________________________ Fit statistic : Chi-Squared = 59.48 using 59 PHA bins. Test statistic : Chi-Squared = 59.48 using 59 PHA bins. Reduced chi-squared = 1.081 for 55 degrees of freedom Null hypothesis probability = 3.158643e-01 XSPEC12>log bat_spec_2bb.log Logging to file:bat_spec_2bb.log XSPEC12>show XSPEC version: 12.9.0n Sun Nov 20 14:30:35 2016 Auto-saving is done after every command. Fit statistic in use: Chi-Squared Minimization technique: Levenberg-Marquardt Convergence criterion = 0.01 Parameter fit deltas: 0.01 * parValue Always calculate parameter derivatives using full (slower) numerical differentiation: No Querying disabled - will not continue fitting. Prefit-renorming enabled. Solar abundance table: angr Photoionization Cross-Section Table: bcmc: Balucinska-Church and McCammon, 1998 Cosmology in use: H0 = 70 q0 = 0 Lambda0 = 0.73 Model data directory: /software/lheasoft/release/x86_64-unknown-linux-gnu-libc2.12/../spectral/modelData/ Plot settings: Showing of individual additive components is OFF. Showing of background spectra is OFF. Effective area normalization is OFF. Current unit settings: Energy = keV Wavelength = angstrom, with Y-Axis displayed per Hz X-Axis data display mode: Channels Spectra plots will be shifted to source frame by redshift value z: 0 Device: /null Plotting of line IDs is OFF. Splashpage is ON. xlog for data plots is ON. ylog for data plots is OFF. Default plot rebin settings for all plot groups: Min. Signif. Max. # Bins Error Type 0.00000 1 quad Responses read: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger717500/remake_spec_cflux/spec_1speak/sw00717500000b_1speak.rsp associated with spectrum 1 source 1 energies: 204 channels: 80 Distinct RMF files: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger717500/remake_spec_cflux/spec_1speak/sw00717500000b_1speak.rsp 1 file 1 spectrum Spectrum 1 Spectral Data File: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger717500/00717500000-results/pha/sw00717500000b_peak.pha Net count rate (cts/s) for Spectrum:1 3.604e-01 +/- 3.818e-02 Assigned to Data Group 1 and Plot Group 1 Noticed Channels: 4-62 Telescope: SWIFT Instrument: BAT Channel Type: PI Exposure Time: 1 sec Using fit statistic: chi Using test statistic: chi Using Response (RMF) File /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger717500/remake_spec_cflux/spec_1speak/sw00717500000b_1speak.rsp for Source 1 Spectral data counts: 0.360361 Model predicted rate: 0.316546 Current model list: ======================================================================== Model bbodyrad<1> + bbodyrad<2> Source No.: 1 Active/On Model Model Component Parameter Unit Value par comp 1 1 bbodyrad kT keV 2.68661 +/- 2.10897 2 1 bbodyrad norm 124.489 +/- 624.997 3 2 bbodyrad kT keV 16.6021 +/- 1.70893 4 2 bbodyrad norm 0.245052 +/- 0.101082 ________________________________________________________________________ Using energies from responses. Fit statistic : Chi-Squared = 59.48 using 59 PHA bins. Test statistic : Chi-Squared = 59.48 using 59 PHA bins. Reduced chi-squared = 1.081 for 55 degrees of freedom Null hypothesis probability = 3.158643e-01 Weighting method: standard XSPEC12>flux 15.0 25.0 err 500 90 Parameter distribution is derived from fit covariance matrix. Model Flux 0.82251 photons (2.5183e-08 ergs/cm^2/s) range (15.000 - 25.000 keV) Error range 0.1635 - 0.8412 (5.248e-09 - 2.554e-08) (90.00% confidence) XSPEC12>flux 25.0 50.0 err 500 90 Parameter distribution is derived from fit covariance matrix. Model Flux 1.0428 photons (6.1189e-08 ergs/cm^2/s) range (25.000 - 50.000 keV) Error range 0.5194 - 1.214 (3.084e-08 - 7.144e-08) (90.00% confidence) XSPEC12>flux 50.0 150.0 err 500 90 Parameter distribution is derived from fit covariance matrix. Model Flux 0.98009 photons (1.1732e-07 ergs/cm^2/s) range (50.000 - 150.00 keV) Error range 0.4981 - 1.132 (5.838e-08 - 1.384e-07) (90.00% confidence) XSPEC12>flux 15.0 150.0 err 500 90 Parameter distribution is derived from fit covariance matrix. Model Flux 2.8454 photons (2.0369e-07 ergs/cm^2/s) range (15.000 - 150.00 keV) Error range 1.086 - 2.984 (9.361e-08 - 2.268e-07) (90.00% confidence) XSPEC12>error 1 Parameter Confidence Range (2.706) ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 2 is pegged at 131.111 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Number of trials exceeded before bracketing of delta fit-stat. Last attempt: -1.81888e+06, with delta statistic: 2.35468 *** Parameter lower bound is INVALID. Apparent non-monotonicity in statistic space detected. Current bracket values 13.9429, 14.1402 and delta stat 2.61154, 3.74434 but latest trial 13.9596 gives 2.61007 Suggest that you check this result using the steppar command. 1 0 14.0416 (-2.68624,11.3553) XSPEC12>error 2 Parameter Confidence Range (2.706) Due to zero model norms, the following fit parameters are temporarily frozen:1 Due to zero model norms, the following fit parameters are temporarily frozen:1 Due to zero model norms, the following fit parameters are temporarily frozen:1 ***Warning: Zero alpha-matrix diagonal element for parameter 3 ***Warning: Zero alpha-matrix diagonal element for parameter 4 Parameter 3 is pegged at 0.241947 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. Parameter 4 is pegged at 0.00555131 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 3 ***Warning: Zero alpha-matrix diagonal element for parameter 4 Parameter 3 is pegged at 0.241947 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. Parameter 4 is pegged at 0.00555131 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 3 ***Warning: Zero alpha-matrix diagonal element for parameter 4 Parameter 3 is pegged at 0.225174 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. Parameter 4 is pegged at 0.0106712 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 3 ***Warning: Zero alpha-matrix diagonal element for parameter 4 Parameter 3 is pegged at 0.225174 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. Parameter 4 is pegged at 0.0106712 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. Apparent non-monotonicity in statistic space detected. Current bracket values 2149.9, 2165.4 and delta stat 0.113118, 71.0425 but latest trial 2150.52 gives 0.113075 Suggest that you check this result using the steppar command. 2 0 2157.65 (-124.662,2032.99) XSPEC12>error 3 Parameter Confidence Range (2.706) 3 14.3053 19.2456 (-2.29508,2.64521) XSPEC12>error 4 Parameter Confidence Range (2.706) Due to zero model norms, the following fit parameters are temporarily frozen:3 Due to zero model norms, the following fit parameters are temporarily frozen:3 Due to zero model norms, the following fit parameters are temporarily frozen:3 Due to zero model norms, the following fit parameters are temporarily frozen:3 Due to zero model norms, the following fit parameters are temporarily frozen:3 Due to zero model norms, the following fit parameters are temporarily frozen:3 Due to zero model norms, the following fit parameters are temporarily frozen:3 Due to zero model norms, the following fit parameters are temporarily frozen:3 ***Warning: Zero alpha-matrix diagonal element for parameter 1 ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 1 is pegged at 0.216853 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. Parameter 2 is pegged at 478.226 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 1 ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 1 is pegged at 0.216853 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. Parameter 2 is pegged at 478.226 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 1 ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 1 is pegged at 0.0106836 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. Parameter 2 is pegged at 1.20846e+08 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. ***Warning: Zero alpha-matrix diagonal element for parameter 1 ***Warning: Zero alpha-matrix diagonal element for parameter 2 Parameter 1 is pegged at 0.0106836 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. Parameter 2 is pegged at 1.20846e+08 due to zero or negative pivot element, likely caused by the fit being insensitive to the parameter. Apparent non-monotonicity in statistic space detected. Current bracket values 0.328288, 0.393427 and delta stat 0.640527, 3.22616 but latest trial 0.374024 gives 0.510411 Suggest that you check this result using the steppar command. 4 0.129631 0.360857 (-0.115517,0.115709) XSPEC12>log none Log file closed logging switched off XSPEC12>setplot energy XSPEC12>setplot command sc white 1 XSPEC12>setplot command cpd bat_spec_2bb.gif/gif 2 XSPEC12>plot ldata delchi XSPEC12>/* XSPEC12>exit XSPEC: quit Spectral model: bbodyrad<1> + bbodyrad<2> ------------------------------------------------------------ Parameters : value Lower 90% Upper 90% kT1 [keV] : 2.68661 (-2.68624 11.3553) R1^2/D10^2 : 124.489 (-124.662 2032.99) kT2 [keV] : 16.6021 (-2.29508 2.64521) R2^2/D10^2 : 0.245052 (-0.115517 0.115709) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.48 using 59 PHA bins. # Reduced chi-squared = 1.081 for 55 degrees of freedom # Null hypothesis probability = 3.158643e-01 Energy Fluence 90% Error [keV] [erg/cm2] [erg/cm2] 15- 25 2.518e-08 1.015e-08 25- 50 6.119e-08 2.030e-08 50-150 1.173e-07 4.001e-08 15-150 2.037e-07 6.659e-08