Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Wed Jan 22 19:22:29 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger173780
======================================================================
Trigger: 00173780 Segment: 000
BAT Trigger Time: 156822675.776 [s; MET]
Trigger Stop: 156822675.84 [s; MET]
UTC: 2005-12-21T01:51:15.868000 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 328.710912255944 Dec: 16.8957209657683 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.39
Image Trigger?: NO
Rate S/N Ratio: 56.0267793113258 [ if not an image trigger ]
Image S/N Ratio: 16.39
Analysis Position: [ source = BAT ]
RA: 328.710912255944 Dec: 16.8957209657683 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 328.712488221718 Dec: 16.8911945453272 [deg; J2000]
{ 21h 54m 51.0s , +16d 53' 28.3" }
+/- 0.616931500733245 [arcmin] (estimated 90% radius based on SNR)
+/- 0.191656142438593 [arcmin] (formal 1-sigma fit error)
SNR: 60.6428894105721
Angular difference between the analysis and refined position is 0.286260 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 1.39200001955032 +/- 0.1974638995435
Measured from: 0.0320000052452087
to: 1.42400002479553 [s; relative to TRIGTIME]
T50: 0.548000007867813 +/- 0.0800999213143316
Measured from: 0.112000018358231
to: 0.660000026226044 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0279999971389771
to: 0.972000002861023 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0320000052452087
to: 2.09200000762939 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.453369 0.589756 0.545039 0.166671
0.013733 0.015021 0.014121 0.010538 [error]
Peak 0.333818 0.493821 0.491908 0.150075
0.010863 0.012541 0.012510 0.009073 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 2.124 -0.032 2.092
T90 1.392 0.032 1.424
T50 0.548 0.112 0.660
Peak 1.000 -0.028 0.972
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_index}
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.395 -0.054 0.054 - - - 5.63e-02 -1.61e-03 1.61e-03 61.000 57
CPL -1.392 -0.054 0.149 9988.260 -9988.260 -9988.260 5.65e-02 -1.62e-03 8.77e-03 61.030 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.270 -0.052 0.052 - - - 1.02e-01 -2.91e-03 2.91e-03 66.640 57
CPL -1.199 -0.094 0.209 657.548 -657.548 -657.548 1.10e-01 -1.37e-02 2.49e-02 66.280 56
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence PL 1.38e-07 2.71e-07 4.13e-07 1.37e-06 1.16e-06 2.19e-06 erg/cm2
90%_error_low -8.16e-09 -9.34e-09 -1.41e-08 -1.06e-07 -3.49e-08 -1.13e-07 erg/cm2
90%_error_hi 8.37e-09 9.31e-09 1.41e-08 1.12e-07 3.50e-08 1.18e-07 erg/cm2
Peak flux PL 8.10e-04 1.02e-02 8.87e-02 1.00e+01 3.93e-01 9.83e+00 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 1.38e-07 2.71e-07 4.13e-07 1.36e-06 1.16e-06 2.29e-06 erg/cm2
90%_error_low N/A -9.35e-09 N/A N/A -3.49e-08 -3.48e-07 erg/cm2
90%_error_hi N/A 9.30e-09 N/A N/A 3.49e-08 4.49e-09 erg/cm2
Peak flux CPL 3.31e+00 3.90e+00 3.25e+00 4.19e+00 1.21e+01 1.47e+01 ph/cm2/s
90%_error_low -2.68e-01 -1.36e-01 -1.06e-01 -7.58e-01 -3.97e-01 -8.96e-01 ph/cm2/s
90%_error_hi 2.32e-01 1.43e-01 1.29e-01 4.26e-01 3.98e-01 5.78e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 328.7125 16.8912 0.0032 36.6224 -178.5787 1.8182488 60.643 TRIG_00173780 Foreground time interval of the image: -0.032 2.092 (delta_t = 2.124 [sec]) Background time interval of the image: -223.875 -0.032 (delta_t = 223.843 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -0.032 sec. to 2.092 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.39466 ( -0.0544723 0.0544858 ) Norm@50keV : 5.63380E-02 ( -0.00161317 0.00161293 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.00 using 59 PHA bins. # Reduced chi-squared = 1.070 for 57 degrees of freedom # Null hypothesis probability = 3.342475e-01 Photon flux (15-150 keV) in 2.124 sec: 6.85276 ( -0.21712 0.21807 ) ph/cm2/s Energy fluence (15-150 keV) : 1.15767e-06 ( -3.49154e-08 3.49574e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 2.092 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.39186 ( -0.0541745 0.14865 ) Epeak [keV] : 9988.26 ( -9996.57 -9996.57 ) Norm@50keV : 5.65433E-02 ( -0.00161638 0.00877272 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.03 using 59 PHA bins. # Reduced chi-squared = 1.090 for 56 degrees of freedom # Null hypothesis probability = 2.998938e-01 Photon flux (15-150 keV) in 2.124 sec: 6.85109 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.15743e-06 ( -3.49339e-08 3.49228e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.028 sec. to 0.972 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.27041 ( -0.0521367 0.0522041 ) Norm@50keV : 0.102082 ( -0.00291305 0.00291161 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.64 using 59 PHA bins. # Reduced chi-squared = 1.169 for 57 degrees of freedom # Null hypothesis probability = 1.793145e-01 Photon flux (15-150 keV) in 1 sec: 0.393205 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.01634e-06 ( -3.07189e-08 3.07644e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.028 sec. to 0.972 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.19933 ( -0.0941724 0.208753 ) Epeak [keV] : 657.548 ( -657.776 -657.776 ) Norm@50keV : 0.109669 ( -0.013688 0.0249344 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.28 using 59 PHA bins. # Reduced chi-squared = 1.184 for 56 degrees of freedom # Null hypothesis probability = 1.635932e-01 Photon flux (15-150 keV) in 1 sec: 12.0640 ( -0.3969 0.3982 ) ph/cm2/s Energy fluence (15-150 keV) : 1.01326e-06 ( -3.20544e-08 2.88894e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 1.392 sec. Hardness ratio (energy fluence ratio) = 1.52138925683
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.097687e-07 S(50-150 keV) = 7.478876e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -7.430423029095083E-01, IMY = 1.843573853546018E-02
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -223.875410 -0.032000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2593 35.4597 0.0 31.3 -4.1 -0.1827 -1.0 12.0 Her X-1 268.3728 -1.4794 27.3 42.3 -70.0 -0.3276 -0.4 1.6 SW J1753.5-0127 288.8034 10.9475 1.0 23.5 -98.2 2.2623 12.1 0.3 GRS 1915+105 299.5954 35.2068 0.2 5.8 150.6 8.4280 57.0 0.4 Cyg X-1 308.1176 40.9471 1.2 14.0 129.1 1.6485 9.9 0.5 Cyg X-3 325.9302 38.3016 0.0 27.0 144.0 0.2889 1.4 11.4 Cyg X-2 308.0334 37.6509 2.3 13.0 142.6 0.7942 5.0 ------ UNKNOWN 253.5291 34.6955 2.4 32.0 -5.4 0.9066 4.7 ------ UNKNOWN 261.5087 13.7542 2.3 34.8 -46.0 1.1761 5.0 ------ UNKNOWN 319.2934 -11.9825 2.9 52.7 -141.1 3.4436 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.032000 2.092000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4546 35.3423 125.4 31.2 -4.4 -0.0023 -0.1 0.1 Her X-1 268.3713 -1.6049 4.5 42.4 -70.1 0.2224 2.5 9.1 SW J1753.5-0127 288.9672 11.0551 7.5 23.4 -98.6 -0.0425 -1.5 11.9 GRS 1915+105 299.6674 35.0157 25.9 5.9 152.5 -0.0092 -0.4 11.8 Cyg X-1 308.0246 41.1546 0.0 14.0 128.2 0.0455 2.0 12.7 Cyg X-3 326.2491 38.1556 7.6 27.3 144.3 -0.0427 -1.5 10.6 Cyg X-2 311.9930 33.7512 2.5 16.1 158.6 0.0992 4.5 ------ UNKNOWN 341.8897 9.1392 2.4 51.6 179.5 0.3077 4.8 ------ UNKNOWN 328.7125 16.8912 0.2 36.6 -178.6 1.8183 60.6 ------ UNKNOWN 335.5700 5.0871 2.0 49.3 -171.2 0.2788 5.7 ------ UNKNOWN 260.3820 23.9530 2.0 29.8 -29.1 0.1423 5.9 ------ UNKNOWN 279.7984 19.8688 2.3 18.3 -66.0 0.1215 4.9 ------ UNKNOWN 227.4760 20.6360 2.7 58.4 -12.9 0.4406 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 71.524590 290.682800 292.224000 302.318300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.8013 10.9748 2.0 39.1 -60.2 2.4122 5.9 1.8 GRS 1915+105 299.5908 35.2037 0.2 31.7 -15.9 8.7165 48.3 0.1 Cyg X-1 308.1094 40.9643 1.4 29.9 1.0 1.3731 8.0 0.7 Cyg X-3 326.3159 38.2764 3.8 21.5 28.1 0.4481 3.0 7.3 Cyg X-2 308.0424 20.2956 2.6 19.8 -43.8 0.7076 4.5 ------ UNKNOWN 347.0517 -39.9776 3.5 59.4 -163.1 4.8915 3.3 ------ UNKNOWN 311.0822 -3.7825 2.3 27.0 -105.2 1.0067 4.9 ------ UNKNOWN 265.3358 36.0675 2.3 58.8 -24.5 5.4058 5.0 ------ UNKNOWN 278.0306 16.0245 2.4 48.4 -50.2 3.5392 4.8 ------ UNKNOWN