batgrbproduct analysis for trigger=1347179
batgrbproduct Analysis for Trigger=1347179
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 Sep 5 20:27:21 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1347179/GCN5_download_cron
======================================================================
Trigger: 01347179 Segment: 000
BAT Trigger Time: 778700259.328 [s; MET]
Trigger Stop: 778700260.352 [s; MET]
UTC: 2025-09-04T17:37:03.058860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 84.3577955922695 Dec: 3.58459228169204 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.77
Image Trigger?: NO
Rate S/N Ratio: 20.4205778566621 [ if not an image trigger ]
Image S/N Ratio: 8.77
Flight Position: [ source = BAT ]
RA: 84.3577955922695 Dec: 3.58459228169204 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 84.3772576809579 Dec: 3.57496136714161 [deg; J2000]
{ 05h 37m 30.5s , +03d 34' 29.9" }
+/- 1.04864680037862 [arcmin] (estimated 90% radius based on SNR)
+/- 0.402560442252665 [arcmin] (formal 1-sigma fit error)
SNR: 28.4215685717388
Angular difference between Flight and Ground position is 1.300839 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 37.1119999885559 +/- 13.8892030644256
Measured from: -4.43999981880188
to: 32.672000169754 [s; relative to TRIGTIME]
T50: 14.0360000133514 +/- 1.97821838244111
Measured from: 3.94400012493134
to: 17.9800001382828 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.10800004005432
to: 6.10800004005432 [s; relative to TRIGTIME]
Total Fluence
Measured from: -19.6839998960495
to: 54.444000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.793736 0.954036 0.824558 0.255244
0.053641 0.055679 0.047162 0.037370 [error]
Peak 0.028929 0.048880 0.054732 0.015482
0.006553 0.007006 0.006399 0.005009 [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 2.09e-07 4.07e-07 6.15e-07 2.02e-06 1.73e-06 3.25e-06 erg/cm2
Error 2.35e-08 2.65e-08 4.65e-08 3.47e-07 1.13e-07 3.75e-07 erg/cm2
Peak flux Power-law 2.68e-01 3.42e-01 3.19e-01 5.23e-01 1.11e+00 1.45e+00 ph/cm2/s
Error 7.32e-02 5.70e-02 4.91e-02 1.74e-01 1.56e-01 2.18e-01 ph/cm2/s
Fluence Cutoff-PL 2.08e-07 4.09e-07 6.11e-07 1.99e-06 1.72e-06 3.09e-06 erg/cm2
Error 1.80e-08 2.62e-08 4.69e-08 3.31e-07 1.14e-07 5.06e-07 erg/cm2
Peak flux Cutoff-PL 2.44e-01 3.51e-01 3.33e-01 3.52e-01 1.09e+00 1.28e+00 ph/cm2/s
Error 9.16e-02 6.31e-02 6.07e-02 2.83e-01 1.60e-01 2.77e-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 1.404 0.111 - - 2.42e-03 1.42e-04 61.480 57
CPL 1.401 0.111 9999.4 0.0 2.42e-03 3.32e-04 61.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.100 0.240 - - 9.53e-03 1.31e-03 72.500 57
CPL 0.714 0.852 185.0 0.0 1.44e-02 1.98e-02 72.050 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: 37.248000 sec.
T50 in the 50-300 keV band: 11.072000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 74.128 -19.684 54.444
T90 37.112 -4.440 32.672
T50 14.036 3.944 17.980
Peak 1.000 5.108 6.108
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
84.3773 +3.5750 0.0068 13.6 -6.7 2.2318 28.4 TRIG_01347179
------------------------------------------
Foreground time interval of the image:
-19.684 19.873 (delta_t = 39.557 [sec])
Background time interval of the image:
-239.328 -19.684 (delta_t = 219.644 [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 -19.684 sec. to 54.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40393 ( -0.110706 0.110515 )
Norm@50keV : 2.41506E-03 ( -0.000142551 0.0001423 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.48 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.186898e-01
Photon flux (15-150 keV) in 74.13 sec: 0.294372 ( -0.0180165 0.018079 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72851e-06 ( -1.12907e-07 1.13449e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -19.684 sec. to 54.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40067 ( -0.11115 0.111419 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.42355E-03 ( -0.000143003 0.000520164 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 56 degrees of freedom
# Null hypothesis probability = 2.849865e-01
Photon flux (15-150 keV) in 74.13 sec: 0.294901 ( -0.018654 0.017522 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72008e-06 ( -1.04909e-07 1.23538e-07 ) ergs/cm2
Band function
Time interval is from -19.684 sec. to 54.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17946 ( 1.17946 1.17946 )
beta : -1.40389 ( -0.110531 0.110712 )
Epeak [keV] : 22.0187 ( -22.0111 -22.0111 )
Norm@50keV : 4.86068E-03 ( -0.00258763 0.342721 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.48 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.551610e-01
Photon flux (15-150 keV) in 74.13 sec: 0.346232 ( 6.65377 -0.346232 ) 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] : 17.7378 ( )
R^2/D10^2 : 1.83015E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 164.79 using 59 PHA bins.
# Reduced chi-squared = 2.8910 for 57 degrees of freedom
# Null hypothesis probability = 2.079930e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.586e-08 1.057e-08
25- 50 3.927e-07 3.517e-08
50-150 8.933e-07 9.377e-08
15-150 1.372e-06 1.012e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-19.5205 -200)
Norm : 1.21364 (-0.0715445 0.0715445)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.240e-07 1.490e-08
25- 50 4.309e-07 3.302e-08
50-150 9.451e-07 1.875e-07
15-150 1.600e-06 2.443e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.30734 (-0.901064 1.0425)
R1^2/D10^2 : 0.472554 (-0.205392 0.38939)
kT2 [keV] : 31.5122 (-4.69911 6.98069)
R2^2/D10^2 : 2.37792E-03 (-0.00108454 0.00162815)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.248e-07 4.303e-08
25- 50 3.871e-07 5.964e-08
50-150 1.172e-06 2.506e-07
15-150 1.784e-06 3.013e-07
Peak spectrum fit
Power-law model
Time interval is from 5.108 sec. to 6.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10033 ( -0.243576 0.23658 )
Norm@50keV : 9.53110E-03 ( -0.00131117 0.00130784 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.50 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 57 degrees of freedom
# Null hypothesis probability = 8.089907e-02
Photon flux (15-150 keV) in 1 sec: 1.10558 ( -0.155738 0.156126 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.96409e-08 ( -1.49967e-08 1.51276e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.108 sec. to 6.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.714047 ( -1.19787 0.505266 )
Epeak [keV] : 185.011 ( -185.001 -185.001 )
Norm@50keV : 1.43661E-02 ( -0.00595403 0.0335555 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.05 using 59 PHA bins.
# Reduced chi-squared = 1.287 for 56 degrees of freedom
# Null hypothesis probability = 7.299893e-02
Photon flux (15-150 keV) in 1 sec: 1.08841 ( -0.161005 0.15814 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.76013e-08 ( -1.62588e-08 1.60387e-08 ) ergs/cm2
Band function
Time interval is from 5.108 sec. to 6.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.99999 -4.99999 )
beta : -1.11450 ( -0.25435 0.251894 )
Epeak [keV] : 21.7828 ( -21.7827 13.463 )
Norm@50keV : 1593.72 ( -217.962 2.59788e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.43 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 55 degrees of freedom
# Null hypothesis probability = 5.758741e-02
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] : 20.2355 (-3.24781 4.19292)
R^2/D10^2 : 5.06929E-02 (-0.0230981 0.0390812)
(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 3.983e-09 1.178e-09
25- 50 1.999e-08 5.000e-09
50-150 6.078e-08 1.589e-08
15-150 8.476e-08 1.814e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-38.5252 -200)
Norm : 4.53532 (-0.641936 0.641936)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.129e-08 6.425e-09
25- 50 2.172e-08 1.213e-08
50-150 4.764e-08 2.655e-08
15-150 8.066e-08 4.505e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.86587 (-2.67408 12.7182)
R1^2/D10^2 : 2.54716 (-2.47402 152.186)
kT2 [keV] : 24.3331 (-5.07764 -24.333)
R2^2/D10^2 : 2.59989E-02 (-0.0258237 0.0164351)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.261e-09 4.377e-09
25- 50 1.856e-08 6.836e-09
50-150 6.697e-08 2.806e-08
15-150 9.379e-08 3.639e-08
Plot creation:
Fri Sep 5 20:32:30 EDT 2025