batgrbproduct analysis for trigger=1513316
batgrbproduct Analysis for Trigger=1513316
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): Sun Sep 27 12:15:10 EDT 2026
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1513316/batgroup_hand_proc
======================================================================
Trigger: 01513316 Segment: 000
BAT Trigger Time: 812013220.032 [s; MET]
Trigger Stop: 812013223.104 [s; MET]
UTC: 2026-09-25T07:13:01.512700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 132.461863091586 Dec: 24.9710808030724 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.55
Image Trigger?: NO
Rate S/N Ratio: 13.5646599662505 [ if not an image trigger ]
Image S/N Ratio: 6.55
Flight Position: [ source = BAT ]
RA: 132.461863091586 Dec: 24.9710808030724 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 132.453737082496 Dec: 24.8810422060795 [deg; J2000]
{ 08h 49m 48.9s , +24d 52' 51.8" }
+/- 3.54620499888947 [arcmin] (estimated 90% radius based on SNR)
+/- 1.87678905607022 [arcmin] (formal 1-sigma fit error)
SNR: 4.98587595110552
Angular difference between Flight and Ground position is 5.420379 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 35.4239999055862 +/- 10.5521819155653
Measured from: 0.936000108718872
to: 36.3600000143051 [s; relative to TRIGTIME]
T50: 22.8959999084473 +/- 17.1176866866114
Measured from: 2.01200008392334
to: 24.9079999923706 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.10400009155273
to: 2.10400009155273 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.484000086784363
to: 40.4120000600815 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.110160 0.214426 0.077164 0.054239
0.036164 0.037653 0.031746 0.026596 [error]
Peak 0.020942 0.036179 0.017702 0.001804
0.006017 0.006496 0.005244 0.004489 [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 3.58e-08 6.18e-08 8.14e-08 2.19e-07 2.38e-07 3.97e-07 erg/cm2
Error 1.35e-08 1.56e-08 2.98e-08 1.68e-07 7.16e-08 1.96e-07 erg/cm2
Peak flux Power-law 2.04e-01 1.97e-01 1.33e-01 1.40e-01 5.91e-01 6.74e-01 ph/cm2/s
Error 7.36e-02 4.69e-02 4.18e-02 8.79e-02 1.38e-01 1.62e-01 ph/cm2/s
Fluence Cutoff-PL 3.22e-08 7.61e-08 6.76e-08 1.56e-08 1.89e-07 1.92e-07 erg/cm2
Error 1.59e-08 3.28e-08 5.50e-08 1.96e-07 8.90e-08 2.29e-07 erg/cm2
Peak flux Cutoff-PL 2.03e-01 2.02e-01 1.33e-01 1.06e-01 5.89e-01 6.37e-01 ph/cm2/s
Error 7.61e-02 7.81e-02 6.21e-02 1.24e-01 1.42e-01 1.95e-01 ph/cm2/s
Fluence Band 3.05e-08 7.68e-08 7.21e-08 1.14e-07 2.19e-07 2.94e-07 erg/cm2
Error 1.60e-08 -------- -------- -------- -------- -------- 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 1.601 0.440 - - 6.38e-04 1.77e-04 46.860 57
CPL -0.005 3.673 49.3 0.0 5.78e-03 0.00e+00 46.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.571 0.396 - - 4.64e-03 1.16e-03 62.040 57
CPL 1.344 2.693 115.1 0.0 6.37e-03 1.83e+00 62.040 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 39.928 0.484 40.412
T90 35.424 0.936 36.360
T50 22.896 2.012 24.908
Peak 1.000 1.104 2.104
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
132.4537 +24.8810 0.0387 12.9 157.4 0.3707 5.0 TRIG_01513316
------------------------------------------
Foreground time interval of the image:
0.484 40.412 (delta_t = 39.928 [sec])
Background time interval of the image:
-179.032 0.484 (delta_t = 179.516 [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 0.484 sec. to 40.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60118 ( -0.431517 0.448262 )
Norm@50keV : 6.37812E-04 ( -0.000179879 0.000174385 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.86 using 59 PHA bins.
# Reduced chi-squared = 0.8221 for 57 degrees of freedom
# Null hypothesis probability = 8.287273e-01
Photon flux (15-150 keV) in 39.93 sec: 8.19917E-02 ( -0.0206829 0.0206899 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38142e-07 ( -7.00125e-08 7.30943e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.484 sec. to 40.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.51176E-03 ( -5.13142 2.21542 )
Epeak [keV] : 49.3099 ( )
Norm@50keV : 5.77944E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.21 using 59 PHA bins.
# Reduced chi-squared = 0.8251 for 56 degrees of freedom
# Null hypothesis probability = 8.216668e-01
Photon flux (15-150 keV) in 39.93 sec: 7.66801E-02 ( -0.0215908 0.0233399 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8899e-07 ( -6.57691e-08 1.12325e-07 ) ergs/cm2
Band function
Time interval is from 0.484 sec. to 40.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.65040 ( -4.6504 -4.6504 )
beta : -2.12903 ( -1.18175 0.685885 )
Epeak [keV] : 31.6201 ( -31.6201 9.84199 )
Norm@50keV : 11.7544 ( -2.89347 445493 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.92 using 59 PHA bins.
# Reduced chi-squared = 0.8166 for 55 degrees of freedom
# Null hypothesis probability = 8.321884e-01
Photon flux (15-150 keV) in 39.93 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19062e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.1003 (-2.48841 3.4883)
R^2/D10^2 : 2.80230E-02 (-0.0179519 0.0430788)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.53 using 59 PHA bins.
# Reduced chi-squared = 0.8164 for 57 degrees of freedom
# Null hypothesis probability = 8.374815e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.886e-08 1.785e-08
25- 50 8.256e-08 3.896e-08
50-150 5.786e-08 3.622e-08
15-150 1.693e-07 8.317e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 155.599 (-100.49 -152.42)
Norm : 0.339773 (-0.0889989 0.142239)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.473e-08 1.992e-08
25- 50 6.472e-08 3.694e-08
50-150 1.297e-07 8.190e-08
15-150 2.291e-07 1.357e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.54962 (-1.83007 2.86986)
R1^2/D10^2 : 4.35637E-02 (-0.0229323 0.0638669)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 9.72565E-06 (-7.31406e-06 3.60322e-05)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.151e-08 1.839e-08
25- 50 7.807e-08 4.726e-08
50-150 1.335e-07 3.704e-08
15-150 2.431e-07 9.681e-08
Peak spectrum fit
Power-law model
Time interval is from 1.104 sec. to 2.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57111 ( -0.394737 0.397131 )
Norm@50keV : 4.63937E-03 ( -0.00117288 0.00114442 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.04 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.011660e-01
Photon flux (15-150 keV) in 1 sec: 0.590968 ( -0.137553 0.137611 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.35483e-08 ( -1.16276e-08 1.19984e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.104 sec. to 2.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34378 ( -4.32939 1.0563 )
Epeak [keV] : 115.130 ( -137.248 -137.248 )
Norm@50keV : 6.37423E-03 ( -0.00581293 3.64613 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.04 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 56 degrees of freedom
# Null hypothesis probability = 2.695090e-01
Photon flux (15-150 keV) in 1 sec: 0.588887 ( -0.144772 0.139078 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.26018e-08 ( -1.77647e-08 1.28215e-08 ) ergs/cm2
Band function
Time interval is from 1.104 sec. to 2.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.09165 -5 )
beta : -2.09595 ( -1.09587 0.601294 )
Epeak [keV] : 29.4964 ( -8.79425 14.4812 )
Norm@50keV : 227.365 ( -50.5626 1615.33 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.44 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 55 degrees of freedom
# Null hypothesis probability = 3.501294e-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] : 10.5538 (-2.32858 3.25363)
R^2/D10^2 : 0.243512 (-0.155454 0.367289)
(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 5.614e-09 2.323e-09
25- 50 1.503e-08 6.683e-09
50-150 9.152e-09 4.780e-09
15-150 2.980e-08 1.346e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 164.792 (-100.854 -160.928)
Norm : 2.42389 (-0.592114 0.848988)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.044e-09 3.505e-09
25- 50 1.158e-08 6.460e-09
50-150 2.508e-08 1.469e-08
15-150 4.270e-08 2.459e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.69460 (-2.16764 1.9361)
R1^2/D10^2 : 0.441575 (-0.259467 0.686984)
kT2 [keV] : 199.363 (-167.916 -199.363)
R2^2/D10^2 : 8.40680E-05 (-4.591e-05 0.00309736)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.262e-09 3.732e-09
25- 50 1.380e-08 8.160e-09
50-150 2.653e-08 8.575e-09
15-150 4.659e-08 1.766e-08
Plot creation:
Sun Sep 27 12:20:48 EDT 2026