The burst occurred when BAT detectors had some issues. Thus, data below ~50 keV are incorrect and should not be used in the analysis.
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BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Sat Oct 29 21:48:32 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1131910/batgroup_hand_proc
======================================================================
Trigger: 01131910 Segment: 000
BAT Trigger Time: 688655817.792 [s; MET]
Trigger Stop: 688655818.816 [s; MET]
UTC: 2022-10-28T13:16:27.675980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 314.205809453804 Dec: 41.0656228856362 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.77
Image Trigger?: NO
Rate S/N Ratio: 36.783148315499 [ if not an image trigger ]
Image S/N Ratio: 7.77
Flight Position: [ source = BAT ]
RA: 314.205809453804 Dec: 41.0656228856362 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 314.197802575268 Dec: 41.0822114853648 [deg; J2000]
{ 20h 56m 47.5s , +41d 04' 56.0" }
+/- 1.55070686148878 [arcmin] (estimated 90% radius based on SNR)
+/- 0.587473058410844 [arcmin] (formal 1-sigma fit error)
SNR: 16.2529830365287
Angular difference between Flight and Ground position is 1.059159 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 57.0879999399185 +/- 14.9647059050599
Measured from: 0.6839998960495
to: 57.771999835968 [s; relative to TRIGTIME]
T50: 22.7919999361038 +/- 11.881096931075
Measured from: 8.17199993133545
to: 30.9639998674393 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.555999994277954
to: 1.55599999427795 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0840001106262207
to: 84.0319999456406 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.001430 0.199417 1.077385 0.388470
0.003271 0.025375 0.058013 0.049353 [error]
Peak 0.000136 0.014983 0.074231 0.033223
0.000380 0.003964 0.009616 0.008942 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
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=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 50-150 50-350 keV
Fluence Power-law 2.69e-07 5.36e-07 8.31e-07 2.83e-06 1.51e-06 3.66e-06 erg/cm2
Error 1.31e-07 1.49e-07 7.76e-08 8.80e-07 1.43e-07 8.74e-07 erg/cm2
Peak flux Power-law 2.61e-01 4.07e-01 4.79e-01 1.09e+00 7.97e-01 1.57e+00 ph/cm2/s
Error 3.71e-01 2.83e-01 1.18e-01 6.34e-01 1.52e-01 6.05e-01 ph/cm2/s
Fluence Cutoff-PL 1.24e-07 4.02e-07 8.50e-07 1.69e-06 1.51e-06 2.53e-06 erg/cm2
Error 1.29e-07 2.41e-07 8.47e-08 1.43e-06 1.48e-07 1.40e-06 erg/cm2
Peak flux Cutoff-PL 3.39e-08 2.40e-05 8.32e-03 5.44e+00 1.46e-01 5.35e+00 ph/cm2/s
Error 2.85e-06 1.91e-04 9.97e-03 1.00e+01 8.21e-02 8.76e+00 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.367 0.325 - - 2.84e-03 5.09e-04 29.60 41
CPL 0.221 2.181 136.554 71.217 4.94e-03 9.81e-03 29.03 41
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.766 0.703 - - 1.27e-02 5.66e-03 35.63 41
CPL 0.081 3.219 265.852 811.994 1.69e-02 2.33e-02 35.58 41
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc === T90 in the 50-300 keV band: 66.688000 sec. T50 in the 50-300 keV band: 22.784000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 84.116 -0.084 84.032
T90 57.088 0.684 57.772
T50 22.792 8.172 30.964
Peak 1.000 0.556 1.556
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 314.1978 41.0822 0.0118 30.6499 55.9526 0.7858192 16.253 TRIG_01131910 Foreground time interval of the image: -0.084 16.709 (delta_t = 16.793 [sec]) Background time interval of the image: -239.792 -0.084 (delta_t = 239.708 [sec])
Time interval is from -0.084 sec. to 84.032 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.10367 ( ) Norm@50keV : 2.71639E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 293.45 using 59 bins. Reduced chi-squared = 5.14825 # Null hypothesis probability of 1.54e-33 with 57 degrees of freedom Photon flux (15-150 keV) in 84.12 sec: 6.47667E-02 ( ) ph/cm2/s Energy fluence (15-150 keV) : 8.96543e-07 ( 0 0 ) ergs/cm2
Time interval is from -0.084 sec. to 84.032 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.70670 ( ) Epeak [keV] : 4076.07 ( ) Norm@50keV : 2.03755E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 271.09 using 59 bins. Reduced chi-squared = 4.84089 # Null hypothesis probability of 5.73e-30 with 56 degrees of freedom Photon flux (15-150 keV) in 84.12 sec: 0.110770 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.36575e-06 ( 0 0 ) ergs/cm2
Time interval is from -0.084 sec. to 84.032 sec. Spectral model in the Band function: ------------------------------------------------------------ Parameters : value lower 90% higher 90% alpha : ( ) beta : ( ) Epeak [keV] : ( ) Norm@50keV : ( ) ------------------------------------------------------------ Photon flux (15-150 keV) in sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Spectral model blackbody: ------------------------------------------------------------ Parameters : value Lower 90% Upper 90% kT [keV] : 5.00000 ( ) R^2/D10^2 : 0.0 ( ) (R is the radius in km and D10 is the distance to the source in units of 10 kpc) ------------------------------------------------------------ #Fit statistic : Chi-Squared 492.77 using 59 bins. Reduced chi-squared = # Null hypothesis probability of 1.14e-70 with 57 degrees of freedom Energy Fluence 90% Error [keV] [erg/cm2] [erg/cm2] 15- 25 0.000e+00 0.000e+00 25- 50 0.000e+00 0.000e+00 50-150 0.000e+00 0.000e+00 15-150 0.000e+00 0.000e+00
Spectral model: thermal bremsstrahlung ------------------------------------------------------------ Parameters : value Lower 90% Upper 90% kT [keV] : 7.00000 ( ) Norm : 0.0 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 492.77 using 59 bins. Reduced chi-squared = # Null hypothesis probability of 1.14e-70 with 57 degrees of freedom Energy Fluence 90% Error [keV] [erg/cm2] [erg/cm2] 15- 25 0.000e+00 0.000e+00 25- 50 0.000e+00 0.000e+00 50-150 0.000e+00 0.000e+00 15-150 0.000e+00 0.000e+00
Spectral model: bbodyrad<1> + bbodyrad<2> ------------------------------------------------------------ Parameters : value Lower 90% Upper 90% kT1 [keV] : 3.19050E-03 ( ) R1^2/D10^2 : 1.94930E-03 ( ) kT2 [keV] : 199.363 ( ) R2^2/D10^2 : 3.67594E-05 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 299.42 using 59 bins. Reduced chi-squared = # Null hypothesis probability of 2.46e-35 with 55 degrees of freedom Energy Fluence 90% Error [keV] [erg/cm2] [erg/cm2] 15- 25 0.000e+00 0.000e+00 25- 50 0.000e+00 0.000e+00 50-150 0.000e+00 0.000e+00 15-150 0.000e+00 0.000e+00
Time interval is from 0.556 sec. to 1.556 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.17927 ( ) Norm@50keV : 1.33657E-05 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 134.83 using 59 bins. Reduced chi-squared = 2.36544 # Null hypothesis probability of 2.99e-08 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 3.91792E-03 ( ) ph/cm2/s Energy fluence (15-150 keV) : 9.11003e-09 ( 0 0 ) ergs/cm2
Time interval is from 0.556 sec. to 1.556 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.591420 ( ) Epeak [keV] : 453.380 ( ) Norm@50keV : 5.53731E-06 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 135.37 using 59 bins. Reduced chi-squared = 2.41732 # Null hypothesis probability of 1.60e-08 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.145553 ( -0.0885656 0.075604 ) ph/cm2/s Energy fluence (15-150 keV) : 4.62488e-08 ( 0 0 ) ergs/cm2
Time interval is from 0.556 sec. to 1.556 sec. Spectral model in the Band function: ------------------------------------------------------------ Parameters : value lower 90% higher 90% alpha : ( ) beta : ( ) Epeak [keV] : ( ) Norm@50keV : ( ) ------------------------------------------------------------ Photon flux (15-150 keV) in sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Spectral model blackbody: ------------------------------------------------------------ Parameters : value Lower 90% Upper 90% kT [keV] : 5.21825 ( ) R^2/D10^2 : 1.32705E-03 ( ) (R is the radius in km and D10 is the distance to the source in units of 10 kpc) ------------------------------------------------------------ #Fit statistic : Chi-Squared 135.45 using 59 bins. Reduced chi-squared = # Null hypothesis probability of 2.48e-08 with 57 degrees of freedom Energy Fluence 90% Error [keV] [erg/cm2] [erg/cm2] 15- 25 3.817e-12 0.000e+00 25- 50 2.766e-12 0.000e+00 50-150 1.377e-13 0.000e+00 15-150 6.721e-12 0.000e+00
Spectral model: thermal bremsstrahlung ------------------------------------------------------------ Parameters : value Lower 90% Upper 90% kT [keV] : 6.57199 ( ) Norm : 2.29243E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 135.45 using 59 bins. Reduced chi-squared = # Null hypothesis probability of 2.48e-08 with 57 degrees of freedom Energy Fluence 90% Error [keV] [erg/cm2] [erg/cm2] 15- 25 6.141e-12 0.000e+00 25- 50 1.360e-12 0.000e+00 50-150 2.373e-14 0.000e+00 15-150 7.525e-12 0.000e+00
Spectral model: bbodyrad<1> + bbodyrad<2> ------------------------------------------------------------ Parameters : value Lower 90% Upper 90% kT1 [keV] : 3.43380 ( ) R1^2/D10^2 : 8.39474E-04 ( ) kT2 [keV] : 12.9727 ( ) R2^2/D10^2 : 7.43447E-05 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 135.42 using 59 bins. Reduced chi-squared = # Null hypothesis probability of 9.91e-09 with 55 degrees of freedom Energy Fluence 90% Error [keV] [erg/cm2] [erg/cm2] 15- 25 3.000e-12 0.000e+00 25- 50 9.198e-12 1.087e-08 50-150 9.691e-12 0.000e+00 15-150 2.189e-11 5.180e-08
Plot creation: Sat Oct 29 22:46:47 EDT 2022