batgrbproduct analysis for trigger=1512356
batgrbproduct Analysis for Trigger=1512356
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): Mon Sep 21 17:16:10 EDT 2026
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1512356/batgroup_hand_proc
======================================================================
Trigger: 01512356 Segment: 000
BAT Trigger Time: 811675790.528 [s; MET]
Trigger Stop: 811675791.552 [s; MET]
UTC: 2026-09-21T09:29:12.031340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 145.372818296902 Dec: 2.85212615697513 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.28
Image Trigger?: NO
Rate S/N Ratio: 60.1747455333215 [ if not an image trigger ]
Image S/N Ratio: 19.28
Flight Position: [ source = BAT ]
RA: 145.372818296902 Dec: 2.85212615697513 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 145.375687186135 Dec: 2.84877789334757 [deg; J2000]
{ 09h 41m 30.2s , +02d 50' 55.6" }
+/- 0.996477287756291 [arcmin] (estimated 90% radius based on SNR)
+/- 0.402691559217056 [arcmin] (formal 1-sigma fit error)
SNR: 30.57087027499
Angular difference between Flight and Ground position is 0.264416 arcmin
Partial Coding Fraction: 0.2773438 [ including projection effects ]
Duration
T90: 8.62399995326996 +/- 1.43795410609326
Measured from: -4.03199994564056
to: 4.59200000762939 [s; relative to TRIGTIME]
T50: 3.04000008106232 +/- 0.28844399226893
Measured from: -1.23199999332428
to: 1.80800008773804 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.131999969482422
to: 1.13199996948242 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.87999999523163
to: 6.92799997329712 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.960281 1.637137 1.493850 0.598314
0.055403 0.063358 0.059013 0.043853 [error]
Peak 0.158145 0.288097 0.337923 0.152452
0.017342 0.021570 0.021977 0.016372 [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 3.56e-07 7.44e-07 1.22e-06 4.48e-06 3.36e-06 6.80e-06 erg/cm2
Error 2.94e-08 3.67e-08 5.69e-08 4.74e-07 1.45e-07 5.03e-07 erg/cm2
Peak flux Power-law 1.81e+00 2.31e+00 2.16e+00 3.54e+00 7.48e+00 9.83e+00 ph/cm2/s
Error 2.61e-01 2.06e-01 1.68e-01 5.81e-01 5.60e-01 7.42e-01 ph/cm2/s
Fluence Cutoff-PL 3.51e-07 7.47e-07 1.23e-06 4.13e-06 3.35e-06 6.44e-06 erg/cm2
Error 3.52e-08 3.92e-08 6.64e-08 9.02e-07 1.49e-07 8.19e-07 erg/cm2
Peak flux Cutoff-PL 1.73e+00 2.34e+00 2.21e+00 3.01e+00 7.44e+00 9.29e+00 ph/cm2/s
Error 3.19e-01 2.19e-01 2.13e-01 8.25e-01 5.67e-01 1.19e+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 1.290 0.072 - - 2.46e-02 1.01e-03 49.610 57
CPL 1.186 0.202 413.7 -87.2 2.74e-02 6.69e-03 49.700 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.099 0.121 - - 6.45e-02 4.66e-03 55.370 57
CPL 0.930 0.357 370.0 0.0 7.67e-02 3.16e-02 54.960 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: 5.760000 sec.
T50 in the 50-300 keV band: 2.240000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 13.808 -6.880 6.928
T90 8.624 -4.032 4.592
T50 3.040 -1.232 1.808
Peak 1.000 0.132 1.132
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
145.3757 +2.8488 0.0063 43.9 -37.5 4.7910 30.6 TRIG_01512356
------------------------------------------
Foreground time interval of the image:
-6.880 6.928 (delta_t = 13.808 [sec])
Background time interval of the image:
-60.528 -6.880 (delta_t = 53.648 [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 -6.880 sec. to 6.928 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29044 ( -0.0725165 0.0720887 )
Norm@50keV : 2.45565E-02 ( -0.00101279 0.0010119 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.61 using 59 PHA bins.
# Reduced chi-squared = 0.8704 for 57 degrees of freedom
# Null hypothesis probability = 7.457096e-01
Photon flux (15-150 keV) in 13.81 sec: 2.92456 ( -0.130137 0.130431 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35906e-06 ( -1.44729e-07 1.4487e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.880 sec. to 6.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18618 ( -0.296546 0.106885 )
Epeak [keV] : 413.740 ( -517.595 -692.031 )
Norm@50keV : 2.73747E-02 ( -0.00461378 0.00876965 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.70 using 59 PHA bins.
# Reduced chi-squared = 0.8875 for 56 degrees of freedom
# Null hypothesis probability = 7.106532e-01
Photon flux (15-150 keV) in 13.81 sec: 2.91577 ( -0.13492 0.13493 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35297e-06 ( -1.49272e-07 1.48623e-07 ) ergs/cm2
Band function
Time interval is from -6.880 sec. to 6.928 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.703141 ( 0.76095 0.76095 )
beta : -1.35613 ( -0.597395 0.111737 )
Epeak [keV] : 85.4505 ( -84.8166 201.211 )
Norm@50keV : 5.34788E-02 ( -0.0317089 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.99 using 59 PHA bins.
# Reduced chi-squared = 0.8725 for 55 degrees of freedom
# Null hypothesis probability = 7.373602e-01
Photon flux (15-150 keV) in 13.81 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] : 19.1702 ( )
R^2/D10^2 : 0.150019 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 189.26 using 59 PHA bins.
# Reduced chi-squared = 3.3204 for 57 degrees of freedom
# Null hypothesis probability = 4.279800e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.492e-07 1.362e-08
25- 50 7.220e-07 4.426e-08
50-150 1.953e-06 1.353e-07
15-150 2.824e-06 1.416e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-6.46149 -200)
Norm : 12.4130 (-0.515869 0.515869)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.270e-07 1.982e-08
25- 50 8.214e-07 3.832e-08
50-150 1.802e-06 8.148e-08
15-150 3.050e-06 1.457e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.28459 (-1.26141 1.37792)
R1^2/D10^2 : 1.13106 (-0.379276 0.643379)
kT2 [keV] : 39.5554 (-7.15682 13.5167)
R2^2/D10^2 : 1.11590E-02 (-0.00634392 0.0100836)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.976e-07 4.281e-08
25- 50 8.068e-07 9.087e-08
50-150 2.259e-06 5.420e-07
15-150 3.363e-06 5.262e-07
Peak spectrum fit
Power-law model
Time interval is from 0.132 sec. to 1.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09927 ( -0.12193 0.120228 )
Norm@50keV : 6.44632E-02 ( -0.00467112 0.00465729 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.37 using 59 PHA bins.
# Reduced chi-squared = 0.9715 for 57 degrees of freedom
# Null hypothesis probability = 5.362948e-01
Photon flux (15-150 keV) in 1 sec: 7.47677 ( -0.559491 0.560248 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.7413e-07 ( -5.17364e-08 5.18358e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.132 sec. to 1.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.930056 ( -0.484427 0.22918 )
Epeak [keV] : 369.960 ( -369.96 -369.96 )
Norm@50keV : 7.67133E-02 ( -0.0160799 0.0470601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9814 for 56 degrees of freedom
# Null hypothesis probability = 5.142592e-01
Photon flux (15-150 keV) in 1 sec: 7.44155 ( -0.56676 0.56719 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.72022e-07 ( -5.2628e-08 5.2466e-08 ) ergs/cm2
Band function
Time interval is from 0.132 sec. to 1.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.933734 ( 0.640729 0.640729 )
beta : -1.81945 ( 7.69056 7.68336 )
Epeak [keV] : 382.707 ( -168.573 -382.203 )
Norm@50keV : 7.63044E-02 ( -0.0054573 0.0287247 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9993 for 55 degrees of freedom
# Null hypothesis probability = 4.760648e-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] : 21.7932 (-2.0636 2.36455)
R^2/D10^2 : 0.272578 (-0.0771693 0.103826)
(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 2.406e-08 3.720e-09
25- 50 1.265e-07 1.390e-08
50-150 4.488e-07 5.615e-08
15-150 5.994e-07 5.585e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-11.6918 -200)
Norm : 30.9819 (-2.3041 2.3041)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.717e-08 6.410e-09
25- 50 1.484e-07 1.680e-08
50-150 3.256e-07 9.925e-08
15-150 5.512e-07 1.155e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.96913 (-2.02098 2.61536)
R1^2/D10^2 : 3.82610 (-2.1954 6.36115)
kT2 [keV] : 34.2037 (-6.41379 12.9961)
R2^2/D10^2 : 5.56032E-02 (-0.0350434 0.05519)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.317e-08 1.809e-08
25- 50 1.368e-07 4.130e-08
50-150 4.906e-07 1.499e-07
15-150 6.806e-07 1.933e-07
Plot creation:
Mon Sep 21 17:26:30 EDT 2026