batgrbproduct analysis for trigger=1519536
batgrbproduct Analysis for Trigger=1519536
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 Oct 18 15:18:45 EDT 2026
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1519536/batgroup_hand_proc
======================================================================
Trigger: 01519536 Segment: 000
BAT Trigger Time: 813945944.128 [s; MET]
Trigger Stop: 813945945.152 [s; MET]
UTC: 2026-10-17T16:05:05.479100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 139.899793339594 Dec: 12.6439928103883 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.35
Image Trigger?: NO
Rate S/N Ratio: 41.821047332653 [ if not an image trigger ]
Image S/N Ratio: 9.35
Flight Position: [ source = BAT ]
RA: 139.899793339594 Dec: 12.6439928103883 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 139.900895704924 Dec: 12.6444338219978 [deg; J2000]
{ 09h 19m 36.2s , +12d 38' 40.0" }
+/- 1.30744661647543 [arcmin] (estimated 90% radius based on SNR)
+/- 0.661565517316966 [arcmin] (formal 1-sigma fit error)
SNR: 20.7395070352287
Angular difference between Flight and Ground position is 0.069752 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 89.3639999628067 +/- 4.77755970489148
Measured from: -0.00800001621246338
to: 89.3559999465942 [s; relative to TRIGTIME]
T50: 65.3679999113083 +/- 3.40305568111108
Measured from: 3.56400001049042
to: 68.9319999217987 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.216000080108643
to: 0.783999919891357 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.703999996185303
to: 93.107999920845 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.517177 0.708941 0.599550 0.293036
0.057939 0.060551 0.051408 0.042866 [error]
Peak 0.022485 0.054925 0.059742 0.052856
0.006728 0.007640 0.007332 0.006835 [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 1.19e-07 2.82e-07 5.32e-07 2.43e-06 1.44e-06 3.36e-06 erg/cm2
Error 2.23e-08 3.00e-08 4.98e-08 5.70e-07 1.29e-07 5.87e-07 erg/cm2
Peak flux Power-law 1.63e-01 3.06e-01 4.42e-01 1.36e+00 1.26e+00 2.27e+00 ph/cm2/s
Error 6.43e-02 7.11e-02 5.58e-02 4.58e-01 1.70e-01 4.20e-01 ph/cm2/s
Fluence Cutoff-PL 1.17e-07 2.81e-07 5.32e-07 2.46e-06 1.45e-06 3.39e-06 erg/cm2
Error 1.73e-08 2.82e-08 4.90e-08 5.00e-07 1.28e-07 6.32e-07 erg/cm2
Peak flux Cutoff-PL 1.70e-01 3.12e-01 4.41e-01 1.30e+00 1.26e+00 2.22e+00 ph/cm2/s
Error 6.47e-02 7.16e-02 5.61e-02 4.26e-01 1.71e-01 4.56e-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 1.086 0.165 - - 1.46e-03 1.22e-04 63.570 57
CPL 1.082 0.167 10000.0 0.0 1.47e-03 1.21e-04 63.660 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.468 0.296 - - 1.05e-02 1.71e-03 65.420 57
CPL 0.460 0.300 10000.0 0.0 1.06e-02 1.56e-03 65.500 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: 9.152000 sec.
T50 in the 50-300 keV band: 5.824000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 93.812 -0.704 93.108
T90 89.364 -0.008 89.356
T50 65.368 3.564 68.932
Peak 1.000 -0.216 0.784
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
139.9009 +12.6444 0.0093 17.2 -42.5 1.2046 20.7 TRIG_01519536
------------------------------------------
Foreground time interval of the image:
-0.704 18.973 (delta_t = 19.677 [sec])
Background time interval of the image:
-179.128 -0.704 (delta_t = 178.424 [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 -0.704 sec. to 93.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08604 ( -0.167236 0.161961 )
Norm@50keV : 1.46421E-03 ( -0.000122337 0.0001217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.57 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 57 degrees of freedom
# Null hypothesis probability = 2.561990e-01
Photon flux (15-150 keV) in 93.81 sec: 0.169619 ( -0.014803 0.0148837 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44256e-06 ( -1.28379e-07 1.28913e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.704 sec. to 93.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08173 ( -0.186584 0.147117 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.47218E-03 ( -0.000122728 0.000120063 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.66 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 56 degrees of freedom
# Null hypothesis probability = 2.248783e-01
Photon flux (15-150 keV) in 93.81 sec: 0.169560 ( -0.014841 0.014844 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44658e-06 ( -1.32385e-07 1.23276e-07 ) ergs/cm2
Band function
Time interval is from -0.704 sec. to 93.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.912950 ( 0.91295 5.91292 )
beta : -1.08601 ( -0.161901 0.167408 )
Epeak [keV] : 41.8445 ( -41.8444 -41.8444 )
Norm@50keV : 2.46752E-03 ( -0.00112359 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.57 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 2.001680e-01
Photon flux (15-150 keV) in 93.81 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] : 23.2936 ( )
R^2/D10^2 : 4.68510E-03 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 118.32 using 59 PHA bins.
# Reduced chi-squared = 2.0758 for 57 degrees of freedom
# Null hypothesis probability = 3.467328e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.295e-08 7.641e-09
25- 50 2.347e-07 3.602e-08
50-150 9.507e-07 1.352e-07
15-150 1.228e-06 1.463e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-16.8517 -200)
Norm : 0.712018 (-0.0602238 0.0602238)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.663e-07 1.825e-08
25- 50 3.199e-07 6.895e-08
50-150 7.015e-07 2.678e-07
15-150 1.188e-06 4.503e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.30377 (-2.06564 1.81106)
R1^2/D10^2 : 6.89513E-02 (-0.0309404 0.0894889)
kT2 [keV] : 87.6220 (-41.7892 -87.4867)
R2^2/D10^2 : 1.39095E-04 (-0.000106424 0.000447411)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.251e-07 7.196e-08
25- 50 2.744e-07 1.207e-07
50-150 1.037e-06 5.599e-07
15-150 1.436e-06 6.687e-07
Peak spectrum fit
Power-law model
Time interval is from -0.216 sec. to 0.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.468427 ( -0.312752 0.279919 )
Norm@50keV : 1.05404E-02 ( -0.00177098 0.00165143 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.42 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.076431e-01
Photon flux (15-150 keV) in 1 sec: 1.25504 ( -0.169481 0.170239 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43917e-07 ( -1.95071e-08 1.95577e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.216 sec. to 0.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.459566 ( -0.337562 0.263227 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.06368E-02 ( -0.00178235 0.00134194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.50 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 56 degrees of freedom
# Null hypothesis probability = 1.805038e-01
Photon flux (15-150 keV) in 1 sec: 1.26082 1.25473 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43501e-07 ( -1.9105e-08 2.0078e-08 ) ergs/cm2
Band function
Time interval is from -0.216 sec. to 0.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.759541 ( 0.759303 0.759303 )
beta : -0.468401 ( -0.280168 0.312745 )
Epeak [keV] : 16.3682 ( -16.373 -16.373 )
Norm@50keV : 1.52941E-02 ( -0.0062631 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.42 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 55 degrees of freedom
# Null hypothesis probability = 1.587445e-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] : 43.3024 (-11.1447 20.8843)
R^2/D10^2 : 7.65878E-03 (-0.00443303 0.00847066)
(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 1.749e-09 5.486e-10
25- 50 1.220e-08 3.439e-09
50-150 1.281e-07 3.501e-08
15-150 1.420e-07 3.948e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-24.6798 -200)
Norm : 4.80225 (-0.703272 0.703272)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.195e-08 6.740e-09
25- 50 2.299e-08 1.295e-08
50-150 5.043e-08 2.847e-08
15-150 8.537e-08 4.745e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.4496 (-3.1092 4.30195)
R1^2/D10^2 : 0.261946 (-0.206408 0.548144)
kT2 [keV] : 199.177 (-143.813 -199.177)
R2^2/D10^2 : 4.28935E-04 (-9.09197e-05 0.00121761)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.627e-09 4.099e-09
25- 50 1.923e-08 1.082e-08
50-150 1.194e-07 8.450e-08
15-150 1.453e-07 1.146e-07
Plot creation:
Sun Oct 18 15:24:21 EDT 2026