batgrbproduct analysis for trigger=1342439
batgrbproduct Analysis for Trigger=1342439
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 Aug 15 15:43:20 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1342439/batgroup_hand_proc
======================================================================
Trigger: 01342439 Segment: 000
BAT Trigger Time: 776849736 [s; MET]
Trigger Stop: 776849808 [s; MET]
UTC: 2025-08-14T07:34:59.856620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 306.328650636288 Dec: 48.3909798891984 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.55
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.55
Flight Position: [ source = BAT ]
RA: 306.328650636288 Dec: 48.3909798891984 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 306.313134833502 Dec: 48.4064028446367 [deg; J2000]
{ 20h 25m 15.2s , +48d 24' 23.1" }
+/- 1.91410846435455 [arcmin] (estimated 90% radius based on SNR)
+/- 0.86081171350287 [arcmin] (formal 1-sigma fit error)
SNR: 12.0312023670586
Angular difference between Flight and Ground position is 1.112819 arcmin
Partial Coding Fraction: 0.546875 [ including projection effects ]
Duration
T90: 110.108000040054 +/- 47.9023809834804
Measured from: 3.21599996089935
to: 113.324000000954 [s; relative to TRIGTIME]
T50: 29.4079998731613 +/- 18.3315524264779
Measured from: 10.932000041008
to: 40.3399999141693 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.2159999608994
to: 11.2159999608994 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.06400001049042
to: 125.363999962807 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.769945 0.924007 0.528043 0.241134
0.097394 0.099038 0.082502 0.065545 [error]
Peak 0.014452 0.053423 0.026780 0.014004
0.009155 0.009788 0.008408 0.006342 [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 2.78e-07 3.99e-07 4.24e-07 8.35e-07 1.36e-06 1.94e-06 erg/cm2
Error 4.86e-08 4.69e-08 7.94e-08 3.14e-07 1.86e-07 3.95e-07 erg/cm2
Peak flux Power-law 2.61e-01 2.59e-01 1.80e-01 1.98e-01 7.79e-01 8.98e-01 ph/cm2/s
Error 1.21e-01 8.03e-02 6.38e-02 1.19e-01 2.33e-01 2.64e-01 ph/cm2/s
Fluence Cutoff-PL 2.70e-07 4.18e-07 4.22e-07 4.47e-07 1.32e-06 1.56e-06 erg/cm2
Error 5.40e-08 6.52e-08 8.72e-08 5.73e-07 2.16e-07 5.84e-07 erg/cm2
Peak flux Cutoff-PL 2.03e-01 3.20e-01 1.91e-01 3.17e-02 7.42e-01 7.46e-01 ph/cm2/s
Error 1.32e-01 1.23e-01 1.03e-01 1.25e-01 2.35e-01 2.50e-01 ph/cm2/s
Fluence Band 2.59e-07 4.32e-07 4.03e-07 6.57e-07 1.32e-06 1.75e-06 erg/cm2
Error -------- -------- 8.67e-08 -------- -------- -------- 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 1.912 0.214 - - 1.19e-03 1.64e-04 73.960 57
CPL 1.553 0.872 54.0 0.0 1.90e-03 0.00e+00 73.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.526 0.459 - - 6.20e-03 1.85e-03 61.500 57
CPL -0.441 3.808 56.2 -18.7 7.28e-02 8.53e+01 59.210 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: 24.064000 sec.
T50 in the 50-300 keV band: 15.488000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 124.300 1.064 125.364
T90 110.108 3.216 113.324
T50 29.408 10.932 40.340
Peak 1.000 10.216 11.216
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
306.3131 +48.4064 0.0160 38.1 9.3 2.1363 12.0 TRIG_01342439
------------------------------------------
Foreground time interval of the image:
1.064 82.501 (delta_t = 81.437 [sec])
Background time interval of the image:
-239.000 1.064 (delta_t = 240.064 [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 1.064 sec. to 125.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91166 ( -0.208664 0.219023 )
Norm@50keV : 1.19073E-03 ( -0.000166368 0.000162519 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.96 using 59 PHA bins.
# Reduced chi-squared = 1.298 for 57 degrees of freedom
# Null hypothesis probability = 6.487993e-02
Photon flux (15-150 keV) in 124.3 sec: 0.171735 ( -0.0204763 0.0204933 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36092e-06 ( -1.84189e-07 1.86886e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.064 sec. to 125.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55292 ( -1.1058 0.639088 )
Epeak [keV] : 53.9753 ( )
Norm@50keV : 1.90315E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.52 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 56 degrees of freedom
# Null hypothesis probability = 5.820348e-02
Photon flux (15-150 keV) in 124.3 sec: 0.169659 ( -0.02121 0.021124 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3165e-06 ( -2.1664e-07 2.1576e-07 ) ergs/cm2
Band function
Time interval is from 1.064 sec. to 125.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.86165 ( -4.13532 -4.13532 )
beta : -2.10266 ( -0.350435 0.296003 )
Epeak [keV] : 26.3766 ( -25.341 77.3494 )
Norm@50keV : 3.74137 ( -3.73797 66.8744 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.08 using 59 PHA bins.
# Reduced chi-squared = 1.311 for 55 degrees of freedom
# Null hypothesis probability = 6.086742e-02
Photon flux (15-150 keV) in 124.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32026e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.4295 (-1.40288 1.62762)
R^2/D10^2 : 6.89604E-02 (-0.0293605 0.0508918)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.48 using 59 PHA bins.
# Reduced chi-squared = 1.535 for 57 degrees of freedom
# Null hypothesis probability = 5.821801e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.924e-07 4.139e-08
25- 50 5.070e-07 7.539e-08
50-150 2.985e-07 8.993e-08
15-150 9.979e-07 1.614e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.6511 (-25.1612 47.5906)
Norm : 0.812098 (-0.136643 0.177515)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.616e-07 4.438e-08
25- 50 4.289e-07 5.699e-08
50-150 5.986e-07 2.585e-07
15-150 1.289e-06 2.823e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.03364 (-3.0889 2.26198)
R1^2/D10^2 : 0.160205 (-0.100637 0.708931)
kT2 [keV] : 42.8430 (-21.1237 -35.9226)
R2^2/D10^2 : 2.59822E-04 (-0.000461452 0.013361)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.544e-07 1.442e-07
25- 50 4.055e-07 2.145e-07
50-150 4.916e-07 2.909e-07
15-150 1.152e-06 6.271e-07
Peak spectrum fit
Power-law model
Time interval is from 10.216 sec. to 11.216 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52552 ( -0.455206 0.462471 )
Norm@50keV : 6.19998E-03 ( -0.00185487 0.0018405 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.50 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.181464e-01
Photon flux (15-150 keV) in 1 sec: 0.779360 ( -0.231995 0.233187 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.85896e-08 ( -1.83841e-08 1.8791e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.216 sec. to 11.216 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.441227 ( -5.49014 2.12637 )
Epeak [keV] : 56.1980 ( -18.5629 -56.0537 )
Norm@50keV : 7.27871E-02 ( -0.0741867 170.473 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.21 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 56 degrees of freedom
# Null hypothesis probability = 3.591965e-01
Photon flux (15-150 keV) in 1 sec: 0.742106 ( -0.232405 0.236892 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.07667e-08 ( -1.93946e-08 2.12126e-08 ) ergs/cm2
Band function
Time interval is from 10.216 sec. to 11.216 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.399666 ( -1.13263 2.20268 )
beta : -10.00000 ( 10 8.31442e-10 )
Epeak [keV] : 56.7397 ( -17.5364 -56.7397 )
Norm@50keV : 6.85665E-02 ( -0.0193159 25.3492 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.21 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 55 degrees of freedom
# Null hypothesis probability = 3.245198e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.51438e-08 ( -5.51368e-08 -1.80719e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.9971 (-3.40707 5.24062)
R^2/D10^2 : 0.158359 (-0.113035 0.319307)
(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 5.674e-09 3.291e-09
25- 50 1.954e-08 1.078e-08
50-150 2.086e-08 1.431e-08
15-150 4.607e-08 2.915e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 175.763 (-114.15 -175.647)
Norm : 3.26807 (-0.96248 1.3042)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.264e-09 4.932e-09
25- 50 1.565e-08 9.210e-09
50-150 3.286e-08 2.028e-08
15-150 5.678e-08 3.376e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 30.6379 (-31.1058 -31.1058)
R1^2/D10^2 : 3.55144E-03 (-0.00306816 0.358616)
kT2 [keV] : 9.99339 (-10.0503 6.87723)
R2^2/D10^2 : 0.312307 (-0.307845 -0.307845)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.875e-09 4.948e-09
25- 50 1.883e-08 1.378e-08
50-150 2.877e-08 1.762e-08
15-150 5.448e-08 3.499e-08
Plot creation:
Fri Aug 15 15:49:40 EDT 2025