batgrbproduct analysis for trigger=1340954
batgrbproduct Analysis for Trigger=1340954
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 Aug 10 19:56:21 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1340954/GCN5_download_cron
======================================================================
Trigger: 01340954 Segment: 000
BAT Trigger Time: 776451235.648 [s; MET]
Trigger Stop: 776451252.032 [s; MET]
UTC: 2025-08-09T16:53:19.531720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 233.015230435181 Dec: -53.2886328539506 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.22
Image Trigger?: NO
Rate S/N Ratio: 12.8452325786651 [ if not an image trigger ]
Image S/N Ratio: 9.22
Flight Position: [ source = BAT ]
RA: 233.015230435181 Dec: -53.2886328539506 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 233.034081554834 Dec: -53.3140539461045 [deg; J2000]
{ 15h 32m 08.2s , -53d 18' 50.6" }
+/- 1.84057840118629 [arcmin] (estimated 90% radius based on SNR)
+/- 0.757471690372623 [arcmin] (formal 1-sigma fit error)
SNR: 12.7236644292203
Angular difference between Flight and Ground position is 1.668329 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 17.7879998683929 +/- 2.76979417821898
Measured from: 1.92400014400482
to: 19.7120000123978 [s; relative to TRIGTIME]
T50: 8.87199997901917 +/- 2.26830774968127
Measured from: 5.88800013065338
to: 14.7600001096725 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.5759999752045
to: 12.5759999752045 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.01199996471405
to: 20.9400000572205 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.246554 0.311576 0.154462 0.040682
0.031664 0.030168 0.024584 0.020770 [error]
Peak 0.024348 0.028273 0.019828 0.002409
0.007362 0.006687 0.005700 0.004634 [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 7.45e-08 1.12e-07 1.26e-07 2.71e-07 3.94e-07 5.84e-07 erg/cm2
Error 1.26e-08 1.30e-08 2.28e-08 9.75e-08 5.39e-08 1.21e-07 erg/cm2
Peak flux Power-law 2.22e-01 1.88e-01 1.09e-01 9.35e-02 5.60e-01 6.13e-01 ph/cm2/s
Error 9.05e-02 5.21e-02 4.30e-02 7.23e-02 1.55e-01 1.70e-01 ph/cm2/s
Fluence Cutoff-PL 6.72e-08 1.29e-07 1.20e-07 4.86e-08 3.51e-07 3.64e-07 erg/cm2
Error 1.42e-08 1.89e-08 2.91e-08 8.88e-08 5.98e-08 1.03e-07 erg/cm2
Peak flux Cutoff-PL 1.84e-01 2.14e-01 1.15e-01 2.72e-02 5.35e-01 5.41e-01 ph/cm2/s
Error 1.08e-01 6.80e-02 5.28e-02 7.80e-02 1.61e-01 1.81e-01 ph/cm2/s
Fluence Band 6.51e-08 1.31e-07 1.14e-07 1.61e-07 3.70e-07 4.73e-07 erg/cm2
Error 1.50e-08 1.99e-08 2.63e-08 1.42e-07 -------- 1.50e-07 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 1.827 0.203 - - 2.15e-03 2.89e-04 43.390 57
CPL 0.643 1.092 48.0 20.2 1.03e-02 2.72e-02 38.590 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.793 0.481 - - 4.08e-03 1.27e-03 79.850 57
CPL 0.505 2.526 53.7 0.0 1.99e-02 0.00e+00 78.580 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: 28.928000 sec.
T50 in the 50-300 keV band: 11.648000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.928 1.012 20.940
T90 17.788 1.924 19.712
T50 8.872 5.888 14.760
Peak 1.000 11.576 12.576
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
233.0341 -53.3141 0.0150 10.2 -78.9 0.7046 12.7 TRIG_01340954
------------------------------------------
Foreground time interval of the image:
1.012 20.940 (delta_t = 19.928 [sec])
Background time interval of the image:
-239.648 -226.588 (delta_t = 13.060 [sec])
-224.648 -192.358 (delta_t = 32.290 [sec])
-190.648 -43.318 (delta_t = 147.330 [sec])
-42.648 1.012 (delta_t = 43.660 [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 1.012 sec. to 20.940 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82669 ( -0.198947 0.206761 )
Norm@50keV : 2.15160E-03 ( -0.000291476 0.000286582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.39 using 59 PHA bins.
# Reduced chi-squared = 0.7612 for 57 degrees of freedom
# Null hypothesis probability = 9.081443e-01
Photon flux (15-150 keV) in 19.93 sec: 0.299609 ( -0.0349532 0.0349708 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94461e-07 ( -5.33363e-08 5.44155e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.012 sec. to 20.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.642644 ( -1.23776 0.945797 )
Epeak [keV] : 47.9524 ( -9.54458 30.8635 )
Norm@50keV : 1.03127E-02 ( -0.0103133 0.0441349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.59 using 59 PHA bins.
# Reduced chi-squared = 0.6892 for 56 degrees of freedom
# Null hypothesis probability = 9.632716e-01
Photon flux (15-150 keV) in 19.93 sec: 0.287352 ( -0.03608 0.036193 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51009e-07 ( -5.71812e-08 6.25085e-08 ) ergs/cm2
Band function
Time interval is from 1.012 sec. to 20.940 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.81624 ( -0.753707 1.13912 )
beta : -2.25085 ( 9.37167 19.3717 )
Epeak [keV] : 32.5781 ( -11.1787 31.3586 )
Norm@50keV : 0.579441 ( -0.559262 59.1598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.55 using 59 PHA bins.
# Reduced chi-squared = 0.6828 for 55 degrees of freedom
# Null hypothesis probability = 9.653285e-01
Photon flux (15-150 keV) in 19.93 sec: 0.290308 ( 6.70969 -0.035872 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.69634e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7745 (-1.31014 1.5263)
R^2/D10^2 : 0.109847 (-0.0434357 0.0696513)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.82 using 59 PHA bins.
# Reduced chi-squared = 0.8038 for 57 degrees of freedom
# Null hypothesis probability = 8.557046e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.287e-08 1.097e-08
25- 50 1.455e-07 2.115e-08
50-150 9.389e-08 2.506e-08
15-150 2.923e-07 4.594e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.2375 (-26.7226 52.1418)
Norm : 1.39440 (-0.221115 0.272042)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.236e-08 1.187e-08
25- 50 1.209e-07 1.674e-08
50-150 1.779e-07 8.949e-08
15-150 3.712e-07 8.889e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.43674 (-2.97259 2.6223)
R1^2/D10^2 : 0.307031 (-0.179305 0.686687)
kT2 [keV] : 21.3337 (-16.9571 101.916)
R2^2/D10^2 : 4.86354E-03 (-0.00472535 0.028377)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.592e-08 3.293e-08
25- 50 1.315e-07 6.779e-08
50-150 1.641e-07 9.602e-08
15-150 3.615e-07 1.785e-07
Peak spectrum fit
Power-law model
Time interval is from 11.576 sec. to 12.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79251 ( -0.456545 0.505437 )
Norm@50keV : 4.07759E-03 ( -0.0012928 0.0012452 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.85 using 59 PHA bins.
# Reduced chi-squared = 1.401 for 57 degrees of freedom
# Null hypothesis probability = 2.458262e-02
Photon flux (15-150 keV) in 1 sec: 0.560259 ( -0.154932 0.1552 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75491e-08 ( -1.16791e-08 1.2137e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.576 sec. to 12.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.504833 ( -3.36911 1.68264 )
Epeak [keV] : 53.6889 ( )
Norm@50keV : 1.99304E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.58 using 59 PHA bins.
# Reduced chi-squared = 1.403 for 56 degrees of freedom
# Null hypothesis probability = 2.494864e-02
Photon flux (15-150 keV) in 1 sec: 0.535032 ( -0.160881 0.16026 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.45382e-08 ( -1.1642e-08 1.29116e-08 ) ergs/cm2
Band function
Time interval is from 11.576 sec. to 12.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.555731 ( -1.44587 5.28806 )
beta : -9.37164 ( 9.37167 19.3717 )
Epeak [keV] : 54.4802 ( -21.4519 450.763 )
Norm@50keV : 1.85719E-02 ( -0.0185704 1.2042e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.58 using 59 PHA bins.
# Reduced chi-squared = 1.429 for 55 degrees of freedom
# Null hypothesis probability = 2.013838e-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] : 12.3176 (-3.37945 4.84191)
R^2/D10^2 : 0.126620 (-0.126605 0.287595)
(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 4.070e-09 2.522e-09
25- 50 1.320e-08 7.172e-09
50-150 1.225e-08 8.585e-09
15-150 2.953e-08 1.854e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 97.2774 (-54.5323 -97.2608)
Norm : 2.52478 (-0.795655 1.21155)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.598e-09 4.088e-09
25- 50 1.135e-08 6.785e-09
50-150 1.810e-08 1.422e-08
15-150 3.604e-08 2.441e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.68718 (-2.6595 61.3075)
R1^2/D10^2 : 30.5626 (-44.6733 -44.6733)
kT2 [keV] : 14.1129 (-4.20686 -13.9584)
R2^2/D10^2 : 7.21099E-02 (-0.0749157 0.216252)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.820e-09 2.927e-09
25- 50 1.164e-08 6.830e-09
50-150 1.497e-08 1.002e-08
15-150 3.242e-08 1.852e-08
Plot creation:
Sun Aug 10 19:59:50 EDT 2025