batgrbproduct analysis for trigger=1351039
batgrbproduct Analysis for Trigger=1351039
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 Sep 21 12:47:20 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1351039/GCN5_download_cron
======================================================================
Trigger: 01351039 Segment: 000
BAT Trigger Time: 780074753.792 [s; MET]
Trigger Stop: 780074754.816 [s; MET]
UTC: 2025-09-20T15:25:17.429200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 51.4589467862716 Dec: -29.6457820402814 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.27
Image Trigger?: NO
Rate S/N Ratio: 89.0673902166219 [ if not an image trigger ]
Image S/N Ratio: 17.27
Flight Position: [ source = BAT ]
RA: 51.4589467862716 Dec: -29.6457820402814 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 51.4648534243471 Dec: -29.6462933882738 [deg; J2000]
{ 03h 25m 51.6s , -29d 38' 46.7" }
+/- 1.11263931087607 [arcmin] (estimated 90% radius based on SNR)
+/- 0.369138265416316 [arcmin] (formal 1-sigma fit error)
SNR: 26.1154677325042
Angular difference between Flight and Ground position is 0.309531 arcmin
Partial Coding Fraction: 0.1582031 [ including projection effects ]
Duration
T90: 38.0199999809265 +/- 1.26532841152853
Measured from: 0.172000050544739
to: 38.1920000314713 [s; relative to TRIGTIME]
T50: 29.2680000066757 +/- 0.639061803542233
Measured from: 3.40400004386902
to: 32.6720000505447 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.116000056266785
to: 0.883999943733215 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.440000057220459
to: 40.4919999837875 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.111705 7.106151 6.040948 1.883934
0.124368 0.142073 0.129048 0.097800 [error]
Peak 0.265700 0.756114 0.753430 0.241020
0.028056 0.038554 0.037985 0.025117 [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 1.79e-06 3.33e-06 4.76e-06 1.44e-05 1.36e-05 2.43e-05 erg/cm2
Error 8.83e-08 9.77e-08 1.33e-07 9.02e-07 3.38e-07 9.68e-07 erg/cm2
Peak flux Power-law 4.20e+00 5.27e+00 4.82e+00 7.69e+00 1.69e+01 2.20e+01 ph/cm2/s
Error 4.37e-01 3.53e-01 2.89e-01 9.04e-01 9.85e-01 1.27e+00 ph/cm2/s
Fluence Cutoff-PL 1.62e-06 3.40e-06 4.97e-06 9.21e-06 1.34e-05 1.92e-05 erg/cm2
Error 1.14e-07 1.06e-07 1.63e-07 1.81e-06 3.55e-07 1.81e-06 erg/cm2
Peak flux Cutoff-PL 3.21e+00 5.71e+00 5.61e+00 3.34e+00 1.66e+01 1.79e+01 ph/cm2/s
Error 5.18e-01 4.21e-01 4.01e-01 9.40e-01 9.89e-01 1.31e+00 ph/cm2/s
Fluence Band 1.51e-06 3.48e-06 4.85e-06 1.22e-05 1.33e-05 2.21e-05 erg/cm2
Error 1.36e-07 1.27e-07 1.59e-07 1.31e-06 3.55e-07 1.32e-06 erg/cm2
Peak flux Band 2.76e+00 6.18e+00 5.28e+00 5.37e+00 1.64e+01 1.96e+01 ph/cm2/s
Error 6.31e-01 -------- 4.40e-01 -------- 9.94e-01 1.41e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.484 0.043 - - 3.48e-02 8.54e-04 60.210 57
CPL 1.091 0.184 133.4 43.9 5.19e-02 9.57e-03 45.870 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.129 0.085 - - 1.45e-01 8.19e-03 77.960 57
CPL 0.016 0.425 102.0 20.6 4.66e-01 2.11e-01 52.810 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: 36.672000 sec.
T50 in the 50-300 keV band: 29.504000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 40.932 -0.440 40.492
T90 38.020 0.172 38.192
T50 29.268 3.404 32.672
Peak 1.000 -0.116 0.884
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
51.4649 -29.6463 0.0074 47.6 155.6 5.9672 26.1 TRIG_01351039
------------------------------------------
Foreground time interval of the image:
-0.440 14.209 (delta_t = 14.649 [sec])
Background time interval of the image:
-239.792 -0.440 (delta_t = 239.352 [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 -0.440 sec. to 40.492 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48359 ( -0.0433015 0.0432524 )
Norm@50keV : 3.48346E-02 ( -0.000854092 0.000853923 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.21 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.604486e-01
Photon flux (15-150 keV) in 40.93 sec: 4.32981 ( -0.12073 0.12109 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35627e-05 ( -3.38351e-07 3.38465e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.440 sec. to 40.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09149 ( -0.187355 0.180213 )
Epeak [keV] : 133.391 ( -25.3002 62.4646 )
Norm@50keV : 5.19415E-02 ( -0.00851842 0.0106117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.87 using 59 PHA bins.
# Reduced chi-squared = 0.8191 for 56 degrees of freedom
# Null hypothesis probability = 8.308801e-01
Photon flux (15-150 keV) in 40.93 sec: 4.21860 ( -0.1289 0.12956 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33525e-05 ( -3.56337e-07 3.54454e-07 ) ergs/cm2
Band function
Time interval is from -0.440 sec. to 40.492 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.640972 ( -0.437799 0.809864 )
beta : -1.66128 ( -0.148248 0.0976746 )
Epeak [keV] : 74.1974 ( -24.3007 45.288 )
Norm@50keV : 9.39176E-02 ( -0.041768 0.21574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.28 using 59 PHA bins.
# Reduced chi-squared = 0.7688 for 55 degrees of freedom
# Null hypothesis probability = 8.954206e-01
Photon flux (15-150 keV) in 40.93 sec: 4.15983 ( 2.84017 -0.13748 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32751e-05 ( -1.32748e-05 -3.55804e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.6597 ( )
R^2/D10^2 : 0.277119 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 357.23 using 59 PHA bins.
# Reduced chi-squared = 6.2672 for 57 degrees of freedom
# Null hypothesis probability = 4.668169e-45
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.125e-07 3.540e-08
25- 50 3.248e-06 1.152e-07
50-150 7.315e-06 2.763e-07
15-150 1.127e-05 3.315e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-5.70197 -200)
Norm : 18.0289 (-0.440424 0.440424)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.838e-06 5.362e-08
25- 50 3.536e-06 9.905e-08
50-150 7.755e-06 1.985e-07
15-150 1.313e-05 3.745e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.93366 (-0.820717 0.853317)
R1^2/D10^2 : 1.87159 (-0.452038 0.660056)
kT2 [keV] : 31.4034 (-3.10717 4.22658)
R2^2/D10^2 : 2.81559E-02 (-0.0101908 0.0133315)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.359e-06 1.124e-07
25- 50 3.577e-06 1.920e-07
50-150 8.347e-06 6.569e-07
15-150 1.328e-05 7.736e-07
Peak spectrum fit
Power-law model
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12871 ( -0.0853631 0.0846291 )
Norm@50keV : 0.145398 ( -0.00819371 0.00818727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.96 using 59 PHA bins.
# Reduced chi-squared = 1.368 for 57 degrees of freedom
# Null hypothesis probability = 3.403207e-02
Photon flux (15-150 keV) in 1 sec: 16.9152 ( -0.984838 0.986014 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50653e-06 ( -8.87884e-08 8.89013e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62987E-02 ( -0.444396 0.404856 )
Epeak [keV] : 101.999 ( -14.5197 26.7464 )
Norm@50keV : 0.466414 ( -0.157533 0.264194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.81 using 59 PHA bins.
# Reduced chi-squared = 0.9430 for 56 degrees of freedom
# Null hypothesis probability = 5.965372e-01
Photon flux (15-150 keV) in 1 sec: 16.6349 ( -0.988 0.9897 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48164e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.16622 ( -1.21332 2.62653 )
beta : -1.61677 ( -0.644094 0.216425 )
Epeak [keV] : 63.0811 ( -14.5137 36.7858 )
Norm@50keV : 2.28059 ( -2.42894 110.501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.76 using 59 PHA bins.
# Reduced chi-squared = 0.9048 for 55 degrees of freedom
# Null hypothesis probability = 6.744174e-01
Photon flux (15-150 keV) in 1 sec: 16.4263 ( -9.4263 -0.9929 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47832e-06 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.9156 (-1.22009 1.32796)
R^2/D10^2 : 0.872945 (-0.170619 0.206351)
(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 6.686e-08 6.945e-09
25- 50 3.321e-07 2.515e-08
50-150 9.759e-07 8.100e-08
15-150 1.375e-06 8.650e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 70.4748 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.755e-07 1.175e-08
25- 50 3.376e-07 2.060e-08
50-150 7.404e-07 1.460e-07
15-150 1.253e-06 1.530e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.0481 (-2.971 1.62942)
R1^2/D10^2 : 2.52924 (-0.951166 2.10082)
kT2 [keV] : 34.2217 (-8.44087 35.1222)
R2^2/D10^2 : 9.67519E-02 (-0.083954 0.190857)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.397e-08 2.575e-08
25- 50 3.513e-07 9.450e-08
50-150 1.036e-06 3.997e-07
15-150 1.481e-06 5.011e-07
Plot creation:
Sun Sep 21 12:51:10 EDT 2025