batgrbproduct analysis for trigger=1350381
batgrbproduct Analysis for Trigger=1350381
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): Thu Sep 18 13:19:20 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1350381/GCN5_download_cron
======================================================================
Trigger: 01350381 Segment: 000
BAT Trigger Time: 779783300.664 [s; MET]
Trigger Stop: 779783300.696 [s; MET]
UTC: 2025-09-17T06:27:44.321060 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 291.377759295369 Dec: 11.1132662687865 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.69
Image Trigger?: NO
Rate S/N Ratio: 44.8107130048162 [ if not an image trigger ]
Image S/N Ratio: 9.69
Flight Position: [ source = BAT ]
RA: 291.377759295369 Dec: 11.1132662687865 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 291.382383054909 Dec: 11.1166523383858 [deg; J2000]
{ 19h 25m 31.8s , +11d 06' 59.9" }
+/- 1.41581990223548 [arcmin] (estimated 90% radius based on SNR)
+/- 0.432942979567246 [arcmin] (formal 1-sigma fit error)
SNR: 18.5094130552617
Angular difference between Flight and Ground position is 0.339677 arcmin
Partial Coding Fraction: 0.4804688 [ including projection effects ]
Duration
T90: 0.287999987602234 +/- 0.0843800854316004
Measured from: 0.00400006771087646
to: 0.29200005531311 [s; relative to TRIGTIME]
T50: 0.0999999046325684 +/- 0.032249103740824
Measured from: 0.0200001001358032
to: 0.120000004768372 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.312000036239624
to: 0.687999963760376 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.371999979019165 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.075981 0.098639 0.082336 0.027217
0.008107 0.009488 0.008016 0.005966 [error]
Peak 0.067511 0.102643 0.086388 0.024304
0.010728 0.011939 0.010458 0.008042 [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 2.65e-08 4.43e-08 5.62e-08 1.43e-07 1.67e-07 2.70e-07 erg/cm2
Error 4.27e-09 4.50e-09 7.48e-09 3.95e-08 1.81e-08 4.59e-08 erg/cm2
Peak flux Power-law 8.08e-01 8.04e-01 5.61e-01 6.20e-01 2.42e+00 2.79e+00 ph/cm2/s
Error 1.71e-01 1.06e-01 8.46e-02 1.89e-01 3.05e-01 3.42e-01 ph/cm2/s
Fluence Cutoff-PL 2.57e-08 4.53e-08 5.74e-08 1.08e-07 1.66e-07 2.37e-07 erg/cm2
Error 5.02e-09 5.48e-09 6.37e-09 5.30e-08 1.86e-08 7.04e-08 erg/cm2
Peak flux Cutoff-PL 7.51e-01 8.29e-01 5.86e-01 4.37e-01 2.39e+00 2.60e+00 ph/cm2/s
Error 2.11e-01 1.23e-01 1.02e-01 2.46e-01 3.13e-01 4.52e-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 1.656 0.168 - - 4.82e-02 4.95e-03 55.260 57
CPL 1.459 0.541 142.6 0.0 6.05e-02 4.52e-02 55.000 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.519 0.206 - - 1.93e-02 2.38e-03 53.060 57
CPL 1.164 0.743 126.0 0.0 2.86e-02 3.17e-02 52.510 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.372 0.000 0.372
T90 0.288 0.004 0.292
T50 0.100 0.020 0.120
Peak 1.000 -0.312 0.688
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
291.3824 +11.1167 0.0104 43.8 -11.7 0.2940 18.5 TRIG_01350381
------------------------------------------
Foreground time interval of the image:
0.000 0.372 (delta_t = 0.372 [sec])
Background time interval of the image:
-239.664 -21.404 (delta_t = 218.260 [sec])
-14.664 0.000 (delta_t = 14.664 [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 0.000 sec. to 0.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65581 ( -0.165893 0.170393 )
Norm@50keV : 4.82246E-02 ( -0.00496699 0.00492491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.26 using 59 PHA bins.
# Reduced chi-squared = 0.9695 for 57 degrees of freedom
# Null hypothesis probability = 5.405225e-01
Photon flux (15-150 keV) in 0.372 sec: 6.30906 ( -0.639866 0.641136 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66748e-07 ( -1.80243e-08 1.81309e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45949 ( -0.724147 0.357229 )
Epeak [keV] : 142.590 ( -142.583 -142.583 )
Norm@50keV : 6.04723E-02 ( -0.0144703 0.0759291 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.00 using 59 PHA bins.
# Reduced chi-squared = 0.9822 for 56 degrees of freedom
# Null hypothesis probability = 5.126218e-01
Photon flux (15-150 keV) in 0.372 sec: 6.26808 ( -0.65411 0.65316 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65563e-07 ( -1.86569e-08 1.85959e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.372 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51576 ( 1.51574 0.541607 )
beta : -2.77322 ( 9.09657 19.0966 )
Epeak [keV] : 181.552 ( -104.05 -181.459 )
Norm@50keV : 5.65780E-02 ( -0.00554971 0.034509 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.02 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 55 degrees of freedom
# Null hypothesis probability = 4.736899e-01
Photon flux (15-150 keV) in 0.372 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] : 14.6378 (-1.67913 1.90162)
R^2/D10^2 : 0.773313 (-0.277944 0.426354)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.74 using 59 PHA bins.
# Reduced chi-squared = 1.452 for 57 degrees of freedom
# Null hypothesis probability = 1.457153e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.295e-08 2.703e-09
25- 50 5.031e-08 6.715e-09
50-150 7.254e-08 1.375e-08
15-150 1.358e-07 1.815e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 160.054 (-56.0919 -161.744)
Norm : 25.8514 (-2.84751 3.30338)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.455e-08 5.813e-09
25- 50 4.593e-08 1.626e-08
50-150 9.307e-08 4.916e-08
15-150 1.636e-07 7.593e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.54396 (-1.5798 2.71339)
R1^2/D10^2 : 34.5318 (-28.7798 256.607)
kT2 [keV] : 20.1855 (-3.5094 6.76201)
R2^2/D10^2 : 0.207232 (-0.14129 0.208251)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.700e-08 1.293e-08
25- 50 4.097e-08 1.296e-08
50-150 9.171e-08 2.701e-08
15-150 1.597e-07 4.678e-08
Peak spectrum fit
Power-law model
Time interval is from -0.312 sec. to 0.688 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51909 ( -0.204241 0.208398 )
Norm@50keV : 1.92837E-02 ( -0.00238699 0.00237671 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.06 using 59 PHA bins.
# Reduced chi-squared = 0.9308 for 57 degrees of freedom
# Null hypothesis probability = 6.237134e-01
Photon flux (15-150 keV) in 1 sec: 2.41994 ( -0.304659 0.305348 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82378e-07 ( -2.41891e-08 2.43151e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.312 sec. to 0.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16359 ( -0.954561 0.530632 )
Epeak [keV] : 125.953 ( -125.95 -125.95 )
Norm@50keV : 2.86467E-02 ( -0.0114382 0.0519845 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.51 using 59 PHA bins.
# Reduced chi-squared = 0.9376 for 56 degrees of freedom
# Null hypothesis probability = 6.078956e-01
Photon flux (15-150 keV) in 1 sec: 2.38866 ( -0.31382 0.31316 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80043e-07 ( -2.5228e-08 2.5061e-08 ) ergs/cm2
Band function
Time interval is from -0.312 sec. to 0.688 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16444 ( 1.24728 0.818539 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 126.076 ( -50.5152 -126.076 )
Norm@50keV : 2.86193E-02 ( -0.0114149 0.00846644 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.51 using 59 PHA bins.
# Reduced chi-squared = 0.9547 for 55 degrees of freedom
# Null hypothesis probability = 5.704665e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82554e-07 ( -1.82547e-07 -1.82554e-07 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.8405 (-2.15081 2.58588)
R^2/D10^2 : 0.232153 (-0.0967531 0.156851)
(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 1.207e-08 2.553e-09
25- 50 5.036e-08 1.010e-08
50-150 8.798e-08 2.049e-08
15-150 1.504e-07 2.365e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.349 (-72.5857 -199.357)
Norm : 9.95402 (-1.20645 1.20843)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.479e-08 7.805e-09
25- 50 4.768e-08 2.636e-08
50-150 1.046e-07 5.747e-08
15-150 1.770e-07 9.755e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.57676 (-1.69128 7.03126)
R1^2/D10^2 : 34.5179 (-33.9676 2043.23)
kT2 [keV] : 19.3969 (-3.53336 19.7933)
R2^2/D10^2 : 0.103805 (-0.0971889 0.114027)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.540e-08 1.212e-08
25- 50 4.178e-08 1.250e-08
50-150 1.032e-07 3.421e-08
15-150 1.704e-07 4.463e-08
Plot creation:
Thu Sep 18 13:22:52 EDT 2025