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: Mon Jan 13 03:44:02 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger526270
======================================================================
Trigger: 00526270 Segment: 000
BAT Trigger Time: 363669072 [s; MET]
Trigger Stop: 363669136 [s; MET]
UTC: 2012-07-11T03:11:02.587440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 331.668154858708 Dec: 60.0195598602082 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.65
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.65
Analysis Position: [ source = BAT ]
RA: 331.668154858708 Dec: 60.0195598602082 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 331.668 Dec: 60.0196 [deg; J2000]
{ 22h 06m 40.3s , +60d 01' 10.6" }
+/- 2.78147568926 [arcmin] (estimated 90% radius based on SNR)
SNR: 7.05498740443
Angular difference between the analysis and refined position is 0.005230 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 60.0960000157356 +/- 20.144552825529
Measured from: -11.0640000104904
to: 49.0320000052452 [s; relative to TRIGTIME]
T50: 23.8719999790192 +/- 21.0544436621287
Measured from: 8.07200002670288
to: 31.944000005722 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 13.1079999804497
to: 14.1079999804497 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.0879999995232
to: 51.3999999761581 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.294071 0.440013 0.207852 0.112954
0.056935 0.058844 0.056538 0.056769 [error]
Peak 0.013137 0.010775 0.019682 0.018122
0.007153 0.007474 0.007137 0.007149 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 63.488 -12.088 51.400
T90 60.096 -11.064 49.032
T50 23.872 8.072 31.944
Peak 1.000 13.108 14.108
====== 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 -1.707 -0.316 0.297 - - - 9.99e-04 -2.02e-04 1.96e-04 43.490 57
CPL -0.892 -1.200 2.182 55.309 -33.158 -55.309 3.00e-03 -3.00e-03 5.75e-02 42.670 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 -0.606 -0.878 1.352 - - - 3.47e-03 -3.47e-03 1.56e-03 47.090 57
CPL -0.640 -0.842 1.467 9999.360 -9999.360 -9999.360 3.54e-03 -2.11e-03 3.36e-02 47.100 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 9.84e-08 1.59e-07 1.95e-07 4.71e-07 5.87e-07 9.24e-07 erg/cm2
90%_error_low -2.31e-08 -2.64e-08 -5.25e-08 -2.13e-07 -1.22e-07 -2.75e-07 erg/cm2
90%_error_hi 2.40e-08 2.64e-08 5.41e-08 3.10e-07 1.27e-07 3.57e-07 erg/cm2
Peak flux PL 6.10e-02 1.05e-01 1.38e-01 3.69e-01 4.04e-01 6.73e-01 ph/cm2/s
90%_error_low -6.10e-02 -1.05e-01 -5.63e-02 -2.65e-01 -4.04e-01 -3.00e-01 ph/cm2/s
90%_error_hi 8.91e-02 6.93e-02 5.43e-02 1.95e+00 1.61e-01 6.63e-01 ph/cm2/s
Fluence CPL 9.26e-08 1.76e-07 1.83e-07 1.12e-07 5.22e-07 5.64e-07 erg/cm2
90%_error_low -2.71e-08 -3.63e-08 -7.56e-08 -1.03e-07 -1.41e-07 -1.81e-07 erg/cm2
90%_error_hi 2.65e-08 4.23e-08 6.28e-08 4.23e-07 1.68e-07 4.67e-07 erg/cm2
Peak flux CPL 6.14e-02 1.05e-01 1.38e-01 3.63e-01 4.05e-01 6.69e-01 ph/cm2/s
90%_error_low -6.14e-02 N/A N/A N/A -1.71e-01 N/A ph/cm2/s
90%_error_hi 8.89e-02 N/A N/A N/A 1.72e-01 N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-50.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 331.668 60.020 0.000 17.079 -93.128 0.611 7.055 TRIG_00526270 Image time interval: 0.000 to 64.000 [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 -12.088 sec. to 51.400 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.70744 ( -0.315989 0.297467 ) Norm@50keV : 9.98657E-04 ( -0.000202201 0.000196035 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.49 using 59 PHA bins. # Reduced chi-squared = 0.7629 for 57 degrees of freedom # Null hypothesis probability = 9.063198e-01 Photon flux (15-150 keV) in 63.49 sec: 0.132985 ( -0.022 0.022001 ) ph/cm2/s Energy fluence (15-150 keV) : 5.86807e-07 ( -1.21783e-07 1.27155e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.088 sec. to 51.400 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.891897 ( -1.20921 2.17311 ) Epeak [keV] : 55.3094 ( -32.8671 -55.0185 ) Norm@50keV : 3.00355E-03 ( -0.00307167 0.0574675 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.67 using 59 PHA bins. # Reduced chi-squared = 0.7621 for 56 degrees of freedom # Null hypothesis probability = 9.051111e-01 Photon flux (15-150 keV) in 63.49 sec: 0.128048 ( -0.023619 0.023837 ) ph/cm2/s Energy fluence (15-150 keV) : 5.22342e-07 ( -1.40543e-07 1.68065e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 13.108 sec. to 14.108 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.605754 ( -0.877897 1.35167 ) Norm@50keV : 3.46508E-03 ( -0.00346468 0.00155806 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.09 using 59 PHA bins. # Reduced chi-squared = 0.8261 for 57 degrees of freedom # Null hypothesis probability = 8.225578e-01 Photon flux (15-150 keV) in 1 sec: 0.404251 6.71025E-02 ( ) ph/cm2/s Energy fluence (15-150 keV) : 4.41998e-08 ( -1.86304e-08 1.8819e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.108 sec. to 14.108 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.640419 ( -0.843302 1.46513 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 3.53509E-03 ( -0.00210556 0.0336171 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.10 using 59 PHA bins. # Reduced chi-squared = 0.8411 for 56 degrees of freedom # Null hypothesis probability = 7.955739e-01 Photon flux (15-150 keV) in 1 sec: 0.404587 ( -0.170966 0.171773 ) ph/cm2/s Energy fluence (15-150 keV) : 4.40829e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 60.096 sec. Hardness ratio (energy fluence ratio) = 1.2248417657
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.5772975e-07 S(50-150 keV) = 3.290727e-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 = -0.0167664741587, IMY = 0.306780430715
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: -179.000000 -12.088000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3079 35.2519 27.9 48.5 165.4 0.3375 0.4 9.1 Her X-1 299.7150 35.1965 7.7 17.1 125.1 0.5066 1.5 6.1 Cyg X-1 308.0571 40.9178 5.2 8.4 128.4 0.6634 2.2 3.2 Cyg X-3 326.1631 38.4380 5.9 8.8 18.3 0.5349 2.0 7.0 Cyg X-2 280.2176 41.5541 3.2 27.6 160.0 1.2357 3.6 ------ UNKNOWN 220.6215 54.1858 4.9 58.8 -159.2 4.6168 2.4 ------ UNKNOWN 219.7291 56.3363 2.9 58.0 -156.8 6.4694 4.0 ------ UNKNOWN 26.2102 60.8230 2.4 41.8 -73.8 5.9111 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -12.088000 51.400000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2533 35.4166 7.0 48.5 165.6 -0.5765 -1.6 10.9 Her X-1 299.7401 35.0869 7.6 17.2 124.7 -0.2118 -1.5 10.1 Cyg X-1 308.0905 41.1169 6.0 8.3 129.4 0.2501 1.9 9.9 Cyg X-3 326.1411 38.3929 19.0 8.9 18.6 -0.0765 -0.6 4.5 Cyg X-2 308.1004 10.6818 2.6 35.4 80.8 1.4713 4.4 ------ UNKNOWN 330.8527 42.3806 2.4 9.5 -15.3 0.6139 4.9 ------ UNKNOWN 331.7104 59.9925 2.0 17.1 -93.0 0.7846 5.7 ------ UNKNOWN 257.7541 65.7044 2.3 38.0 -152.0 0.8403 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 112.500610 864.300600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.6082 35.2759 2.8 32.2 107.2 4.0513 4.1 4.5 Cyg X-1 308.0558 40.9644 2.3 24.0 101.0 3.5277 5.1 2.6 Cyg X-3 326.2170 38.2738 3.4 22.0 64.3 2.2100 3.4 3.6 Cyg X-2 358.5633 10.1933 3.1 53.7 19.3 9.2494 3.7 ------ UNKNOWN 9.9136 56.7122 3.3 20.0 -44.6 1.7727 3.5 ------ UNKNOWN 217.2498 50.6595 4.2 57.4 -170.4 7.9462 2.7 ------ UNKNOWN 202.7436 54.2318 4.7 58.7 -159.3 13.0168 2.5 ------ UNKNOWN 35.0574 36.2211 2.4 46.2 -35.8 4.8956 4.7 ------ UNKNOWN 200.0790 55.8704 3.6 58.0 -156.8 14.0540 3.2 ------ UNKNOWN 180.9805 64.8836 3.4 53.2 -142.2 11.2251 3.4 ------ UNKNOWN