batgrbproduct analysis for trigger=1513082
batgrbproduct Analysis for Trigger=1513082
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Thu Sep 24 09:02:11 EDT 2026
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1513082/batgroup_hand_proc
======================================================================
Trigger: 01513082 Segment: 000
BAT Trigger Time: 811905246.784 [s; MET]
Trigger Stop: 811905247.808 [s; MET]
UTC: 2026-09-24T01:13:28.271940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 133.739773158039 Dec: 12.0455693875754 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.83
Image Trigger?: NO
Rate S/N Ratio: 50.0199960015992 [ if not an image trigger ]
Image S/N Ratio: 13.83
Flight Position: [ source = BAT ]
RA: 133.739773158039 Dec: 12.0455693875754 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 133.753568259257 Dec: 12.0408275065565 [deg; J2000]
{ 08h 55m 00.9s , +12d 02' 27.0" }
+/- 0.865435566641292 [arcmin] (estimated 90% radius based on SNR)
+/- 0.251961089549811 [arcmin] (formal 1-sigma fit error)
SNR: 37.3923739277964
Angular difference between Flight and Ground position is 0.858032 arcmin
Partial Coding Fraction: 0.3945312 [ including projection effects ]
Duration
T90: 344.824000000954 +/- 1.7845021548826
Measured from: 7.1159999370575
to: 351.939999938011 [s; relative to TRIGTIME]
T50: 77.9199999570847 +/- 0.951066796420879
Measured from: 70.1519999504089
to: 148.071999907494 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 338.783999919891
to: 339.783999919891 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.96000003814697
to: 455.684000015259 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 16.475103 26.235065 26.455659 9.273948
0.153286 0.169793 0.157030 0.126720 [error]
Peak 0.238811 0.422513 0.438829 0.154254
0.010210 0.012859 0.013648 0.010697 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== 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 Power-law 5.68e-06 1.22e-05 2.06e-05 7.96e-05 5.66e-05 1.18e-04 erg/cm2
Error 1.70e-07 2.21e-07 2.46e-07 2.23e-06 6.69e-07 2.23e-06 erg/cm2
Peak flux Power-law 2.65e+00 3.29e+00 2.98e+00 4.69e+00 1.05e+01 1.36e+01 ph/cm2/s
Error 1.82e-01 1.36e-01 1.12e-01 3.84e-01 3.68e-01 4.84e-01 ph/cm2/s
Fluence Cutoff-PL 5.50e-06 1.22e-05 2.08e-05 7.35e-05 5.65e-05 1.12e-04 erg/cm2
Error 2.52e-07 2.24e-07 3.17e-07 4.72e-06 6.78e-07 4.71e-06 erg/cm2
Peak flux Cutoff-PL 2.53e+00 3.32e+00 3.04e+00 3.95e+00 1.04e+01 1.28e+01 ph/cm2/s
Error 2.23e-01 1.43e-01 1.40e-01 8.66e-01 3.83e-01 9.71e-01 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 1.245 0.023 - - 1.22e-02 1.65e-04 23.050 57
CPL 1.159 0.070 663.5 -178.2 1.32e-02 9.12e-04 20.560 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.144 0.060 - - 9.03e-02 3.04e-03 61.480 57
CPL 0.973 0.218 347.2 0.0 1.08e-01 2.42e-02 59.880 56
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: 342.976000 sec.
T50 in the 50-300 keV band: 78.144000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 461.644 -5.960 455.684
T90 344.824 7.116 351.940
T50 77.920 70.152 148.072
Peak 1.000 338.784 339.784
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
133.7536 +12.0408 0.0051 40.2 -38.5 5.6199 37.4 TRIG_01513082
------------------------------------------
Foreground time interval of the image:
-5.960 16.717 (delta_t = 22.677 [sec])
Background time interval of the image:
-179.784 -5.960 (delta_t = 173.824 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -5.960 sec. to 455.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24498 ( -0.0225932 0.0224977 )
Norm@50keV : 1.22358E-02 ( -0.000165702 0.000165091 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 23.05 using 59 PHA bins.
# Reduced chi-squared = 0.4044 for 57 degrees of freedom
# Null hypothesis probability = 9.999823e-01
Photon flux (15-150 keV) in 461.6 sec: 1.44598 ( -0.0225003 0.0225846 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66005e-05 ( -6.68812e-07 6.68808e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.960 sec. to 455.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15904 ( -0.0940573 0.0468749 )
Epeak [keV] : 663.549 ( -307.226 -663.549 )
Norm@50keV : 1.31593E-02 ( -0.000756603 0.00106807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 20.56 using 59 PHA bins.
# Reduced chi-squared = 0.3672 for 56 degrees of freedom
# Null hypothesis probability = 9.999963e-01
Photon flux (15-150 keV) in 461.6 sec: 1.43439 ( -0.0253 0.02437 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.65252e-05 ( -6.7809e-07 6.7809e-07 ) ergs/cm2
Band function
Time interval is from -5.960 sec. to 455.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15905 ( 1.03726 1.18613 )
beta : -10.00000 ( 10 2.31191e-09 )
Epeak [keV] : 663.520 ( -187.919 -663.52 )
Norm@50keV : 1.31577E-02 ( -0.000155275 0.00106771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 20.56 using 59 PHA bins.
# Reduced chi-squared = 0.3738 for 55 degrees of freedom
# Null hypothesis probability = 9.999937e-01
Photon flux (15-150 keV) in 461.6 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.1448 ( )
R^2/D10^2 : 3.45918E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1270.44 using 59 PHA bins.
# Reduced chi-squared = 22.2884 for 57 degrees of freedom
# Null hypothesis probability = 2.941404e-228
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.647e-06 4.501e-08
25- 50 9.174e-06 2.008e-07
50-150 3.982e-05 5.724e-07
15-150 5.065e-05 6.693e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 6.60594 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.593e-06 1.085e-07
25- 50 1.461e-05 2.193e-07
50-150 3.203e-05 4.754e-07
15-150 5.423e-05 7.616e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.86558 (-0.468543 0.489547)
R1^2/D10^2 : 0.560238 (-0.0924406 0.115227)
kT2 [keV] : 35.9012 (-1.48171 1.69962)
R2^2/D10^2 : 8.01133E-03 (-0.0011557 0.0012428)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.589e-06 2.645e-07
25- 50 1.252e-05 3.000e-07
50-150 3.930e-05 6.878e-07
15-150 5.642e-05 8.540e-07
Peak spectrum fit
Power-law model
Time interval is from 338.784 sec. to 339.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14380 ( -0.0600891 0.0599289 )
Norm@50keV : 9.03364E-02 ( -0.00303874 0.00303723 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.48 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.188278e-01
Photon flux (15-150 keV) in 1 sec: 10.5274 ( -0.367825 0.36826 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.31702e-07 ( -3.41787e-08 3.42426e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 338.784 sec. to 339.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.972759 ( -0.24164 0.194249 )
Epeak [keV] : 347.220 ( -347.22 -347.22 )
Norm@50keV : 0.107602 ( -0.0191492 0.0291748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.88 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 56 degrees of freedom
# Null hypothesis probability = 3.367795e-01
Photon flux (15-150 keV) in 1 sec: 10.4435 ( -0.3832 0.3837 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.25466e-07 ( -3.5714e-08 3.5566e-08 ) ergs/cm2
Band function
Time interval is from 338.784 sec. to 339.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.689933 ( 0.690376 0.690376 )
beta : -1.20723 ( 1.20651 0.101517 )
Epeak [keV] : 119.146 ( -119.011 661.973 )
Norm@50keV : 0.160861 ( -0.0723204 2634.46 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.73 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 55 degrees of freedom
# Null hypothesis probability = 3.079360e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.5761 ( )
R^2/D10^2 : 0.448897 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.622e-08 2.360e-09
25- 50 1.838e-07 9.100e-09
50-150 5.788e-07 3.260e-08
15-150 7.988e-07 3.290e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 43.7521 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.090e-07 3.650e-09
25- 50 2.096e-07 7.450e-09
50-150 4.596e-07 1.635e-08
15-150 7.782e-07 2.740e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.30962 (-1.17473 1.32025)
R1^2/D10^2 : 4.73824 (-1.68195 2.97276)
kT2 [keV] : 33.8449 (-4.00418 6.02233)
R2^2/D10^2 : 7.66690E-02 (-0.0313087 0.0401155)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.349e-08 9.350e-09
25- 50 1.957e-07 1.725e-08
50-150 6.619e-07 6.855e-08
15-150 9.310e-07 7.990e-08
Plot creation:
Thu Sep 24 09:11:40 EDT 2026