batgrbproduct analysis for trigger=1413695
batgrbproduct Analysis for Trigger=1413695
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): Fri Nov 14 13:06:06 EST 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1413695/batgroup_hand_proc
======================================================================
Trigger: 01413695 Segment: 000
BAT Trigger Time: 784675772.544 [s; MET]
Trigger Stop: 784675774.592 [s; MET]
UTC: 2025-11-12T21:28:55.869080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.018999550852 Dec: 24.2255822810423 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.94
Image Trigger?: NO
Rate S/N Ratio: 11.7473401244707 [ if not an image trigger ]
Image S/N Ratio: 7.94
Flight Position: [ source = BAT ]
RA: 274.018999550852 Dec: 24.2255822810423 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.081371577305 Dec: 24.1580115863908 [deg; J2000]
{ 18h 16m 19.5s , +24d 09' 28.8" }
+/- 1.43946879179975 [arcmin] (estimated 90% radius based on SNR)
+/- 0.646052674435568 [arcmin] (formal 1-sigma fit error)
SNR: 18.0765339213194
Angular difference between Flight and Ground position is 5.299999 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 55.4199999570847 +/- 6.64656453164335
Measured from: -24.6360000371933
to: 30.7839999198914 [s; relative to TRIGTIME]
T50: 24.5439999103546 +/- 9.78714766128789
Measured from: -0.360000014305115
to: 24.1839998960495 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.05199992656708
to: 2.05199992656708 [s; relative to TRIGTIME]
Total Fluence
Measured from: -28.2960000038147
to: 32.3799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.583116 0.650482 0.340303 0.045402
0.046675 0.047433 0.039382 0.031772 [error]
Peak 0.025757 0.036351 0.021589 0.006747
0.006373 0.006592 0.005429 0.004231 [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 1.64e-07 2.42e-07 2.68e-07 5.59e-07 8.44e-07 1.23e-06 erg/cm2
Error 2.01e-08 2.06e-08 3.65e-08 1.51e-07 8.54e-08 1.89e-07 erg/cm2
Peak flux Power-law 2.40e-01 2.24e-01 1.45e-01 1.46e-01 6.70e-01 7.55e-01 ph/cm2/s
Error 7.59e-02 4.78e-02 4.24e-02 8.25e-02 1.41e-01 1.64e-01 ph/cm2/s
Fluence Cutoff-PL 1.48e-07 2.75e-07 2.59e-07 1.18e-07 7.64e-07 7.99e-07 erg/cm2
Error 2.30e-08 2.90e-08 4.42e-08 1.21e-07 9.34e-08 1.53e-07 erg/cm2
Peak flux Cutoff-PL 2.27e-01 2.43e-01 1.48e-01 6.83e-02 6.61e-01 6.86e-01 ph/cm2/s
Error 8.18e-02 6.47e-02 4.97e-02 1.14e-01 1.07e-01 1.86e-01 ph/cm2/s
Fluence Band 1.46e-07 2.73e-07 2.59e-07 1.24e-07 7.65e-07 8.06e-07 erg/cm2
Error 2.25e-08 2.85e-08 -------- -------- -------- -------- erg/cm2
Peak flux Band 2.27e-01 2.43e-01 1.48e-01 6.84e-02 6.61e-01 6.87e-01 ph/cm2/s
Error -------- -------- -------- -------- 1.42e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.855 0.151 - - 1.51e-03 1.52e-04 94.390 57
CPL 0.774 0.748 48.4 11.9 6.21e-03 7.74e-03 86.370 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.625 0.352 - - 5.17e-03 1.19e-03 71.650 57
CPL 1.047 1.397 72.5 0.0 1.10e-02 0.00e+00 71.050 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: 26.176000 sec.
T50 in the 50-300 keV band: 21.184000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 60.676 -28.296 32.380
T90 55.420 -24.636 30.784
T50 24.544 -0.360 24.184
Peak 1.000 1.052 2.052
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.0814 +24.1580 0.0107 10.7 137.9 1.6726 18.1 TRIG_01413695
------------------------------------------
Foreground time interval of the image:
-28.296 29.757 (delta_t = 58.053 [sec])
Background time interval of the image:
-239.544 -28.296 (delta_t = 211.248 [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 -28.296 sec. to 32.380 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85501 ( -0.148752 0.154076 )
Norm@50keV : 1.51289E-03 ( -0.000152942 0.000150781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 94.39 using 59 PHA bins.
# Reduced chi-squared = 1.656 for 57 degrees of freedom
# Null hypothesis probability = 1.353253e-03
Photon flux (15-150 keV) in 60.68 sec: 0.213086 ( -0.0181666 0.0181717 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.44059e-07 ( -8.47469e-08 8.60904e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -28.296 sec. to 32.380 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.774113 ( -0.814441 0.68114 )
Epeak [keV] : 48.3759 ( -7.8834 15.8708 )
Norm@50keV : 6.20501E-03 ( -0.00361586 0.0118547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.37 using 59 PHA bins.
# Reduced chi-squared = 1.542 for 56 degrees of freedom
# Null hypothesis probability = 5.678527e-03
Photon flux (15-150 keV) in 60.68 sec: 0.204798 ( -0.018756 0.01879 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.63688e-07 ( -9.0753e-08 9.61232e-08 ) ergs/cm2
Band function
Time interval is from -28.296 sec. to 32.380 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.774010 ( -0.578986 0.897104 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 48.3657 ( -7.88008 15.8682 )
Norm@50keV : 6.20582E-03 ( -0.00361659 0.0118599 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.37 using 59 PHA bins.
# Reduced chi-squared = 1.570 for 55 degrees of freedom
# Null hypothesis probability = 4.398041e-03
Photon flux (15-150 keV) in 60.68 sec: 0.205774 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.6455e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.9279 (-1.02434 1.14165)
R^2/D10^2 : 7.34803E-02 (-0.0229721 0.0330098)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 102.54 using 59 PHA bins.
# Reduced chi-squared = 1.7990 for 57 degrees of freedom
# Null hypothesis probability = 2.052127e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.111e-07 1.839e-08
25- 50 3.115e-07 3.213e-08
50-150 2.091e-07 4.308e-08
15-150 6.317e-07 7.021e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.6352 (-20.1346 32.1319)
Norm : 0.998652 (-0.118779 0.139999)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.575e-07 1.948e-08
25- 50 2.614e-07 2.360e-08
50-150 3.770e-07 1.445e-07
15-150 7.959e-07 1.511e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.17501 (-2.02918 2.25191)
R1^2/D10^2 : 0.357788 (-0.21427 1.05114)
kT2 [keV] : 17.3761 (-4.0839 9.76713)
R2^2/D10^2 : 9.02638E-03 (-0.00771124 0.0206568)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.480e-07 7.360e-08
25- 50 2.722e-07 1.284e-07
50-150 3.395e-07 1.817e-07
15-150 7.597e-07 3.001e-07
Peak spectrum fit
Power-law model
Time interval is from 1.052 sec. to 2.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62532 ( -0.344706 0.359539 )
Norm@50keV : 5.17065E-03 ( -0.00120624 0.00117674 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.65 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 57 degrees of freedom
# Null hypothesis probability = 9.157085e-02
Photon flux (15-150 keV) in 1 sec: 0.669771 ( -0.141206 0.141251 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.8214e-08 ( -1.17482e-08 1.20758e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.052 sec. to 2.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04720 ( -1.90355 0.890837 )
Epeak [keV] : 72.4730 ( )
Norm@50keV : 1.10055E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.05 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 56 degrees of freedom
# Null hypothesis probability = 8.478190e-02
Photon flux (15-150 keV) in 1 sec: 0.661237 ( -0.071643 0.142454 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56243e-08 ( -1.33106e-08 1.33299e-08 ) ergs/cm2
Band function
Time interval is from 1.052 sec. to 2.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94928 ( -6.38647 -4.94928 )
beta : -1.97051 ( -0.823926 0.479113 )
Epeak [keV] : 27.6644 ( -10.1621 15.6201 )
Norm@50keV : 337.658 ( -69.348 5547.21 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.77 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 55 degrees of freedom
# Null hypothesis probability = 1.004397e-01
Photon flux (15-150 keV) in 1 sec: 0.661235 ( 6.33877 -0.14222 ) 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] : 11.0568 (-2.56761 3.78098)
R^2/D10^2 : 0.227327 (-0.149675 0.370724)
(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 5.813e-09 2.572e-09
25- 50 1.655e-08 5.928e-09
50-150 1.147e-08 6.249e-09
15-150 3.383e-08 1.211e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 151.833 (-86.8845 -149.271)
Norm : 2.78561 (-0.618562 0.885328)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.147e-09 4.110e-09
25- 50 1.327e-08 7.445e-09
50-150 2.633e-08 1.669e-08
15-150 4.674e-08 2.765e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.76112 (-2.56684 3.17321)
R1^2/D10^2 : 0.647198 (-0.44803 1.82315)
kT2 [keV] : 33.6098 (-26.8161 -33.1415)
R2^2/D10^2 : 2.94035E-03 (-0.00302421 0.0394134)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.369e-09 4.471e-09
25- 50 1.454e-08 8.650e-09
50-150 2.628e-08 1.552e-08
15-150 4.819e-08 2.473e-08
Plot creation:
Fri Nov 14 13:14:51 EST 2025