batgrbproduct analysis for trigger=1352124
batgrbproduct Analysis for Trigger=1352124
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 26 19:28:17 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1352124/GCN5_download_cron
======================================================================
Trigger: 01352124 Segment: 000
BAT Trigger Time: 780512702.912 [s; MET]
Trigger Stop: 780512704.96 [s; MET]
UTC: 2025-09-25T17:04:26.519420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 341.201363225776 Dec: 46.5737856026786 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.89
Image Trigger?: NO
Rate S/N Ratio: 11.9582607431014 [ if not an image trigger ]
Image S/N Ratio: 8.89
Flight Position: [ source = BAT ]
RA: 341.201363225776 Dec: 46.5737856026786 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 341.207080282466 Dec: 46.5491591320948 [deg; J2000]
{ 22h 44m 49.7s , +46d 32' 57.0" }
+/- 0.970384100387726 [arcmin] (estimated 90% radius based on SNR)
+/- 0.312495729210711 [arcmin] (formal 1-sigma fit error)
SNR: 31.7519408632362
Angular difference between Flight and Ground position is 1.496294 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 64.5119998455048 +/- 6.59091497079751
Measured from: -15.5639997720718
to: 48.9480000734329 [s; relative to TRIGTIME]
T50: 34.3400000333786 +/- 3.08970993683459
Measured from: -2.30799984931946
to: 32.0320001840591 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.192000031471252
to: 1.19200003147125 [s; relative to TRIGTIME]
Total Fluence
Measured from: -23.5239999294281
to: 64.4240000247955 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.732446 1.807569 1.083854 0.217747
0.063866 0.065923 0.054860 0.044426 [error]
Peak 0.040712 0.057942 0.037487 0.009573
0.006993 0.007659 0.006452 0.004956 [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 5.28e-07 7.75e-07 8.49e-07 1.75e-06 2.69e-06 3.90e-06 erg/cm2
Error 4.06e-08 3.48e-08 5.72e-08 2.54e-07 1.30e-07 2.98e-07 erg/cm2
Peak flux Power-law 4.05e-01 3.91e-01 2.62e-01 2.75e-01 1.17e+00 1.33e+00 ph/cm2/s
Error 1.00e-01 6.07e-02 5.33e-02 1.13e-01 1.77e-01 2.03e-01 ph/cm2/s
Fluence Cutoff-PL 5.28e-07 7.76e-07 8.49e-07 1.73e-06 2.68e-06 3.88e-06 erg/cm2
Error 4.13e-08 3.41e-08 5.73e-08 4.05e-07 1.28e-07 3.59e-07 erg/cm2
Peak flux Cutoff-PL 4.03e-01 3.93e-01 2.63e-01 2.58e-01 1.17e+00 1.32e+00 ph/cm2/s
Error 1.10e-01 6.74e-02 5.75e-02 2.01e-01 1.79e-01 2.42e-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 1.868 0.088 - - 3.32e-03 1.60e-04 41.680 57
CPL 1.870 0.245 9999.2 0.0 3.32e-03 0.00e+00 41.690 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.574 0.266 - - 9.18e-03 1.46e-03 52.250 57
CPL 2.002 0.016 0.7 0.1 5.41e-03 1.80e-03 52.010 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: 58.944000 sec.
T50 in the 50-300 keV band: 25.728000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 87.948 -23.524 64.424
T90 64.512 -15.564 48.948
T50 34.340 -2.308 32.032
Peak 1.000 0.192 1.192
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
341.2071 +46.5492 0.0061 22.2 136.1 4.6151 31.8 TRIG_01352124
------------------------------------------
Foreground time interval of the image:
-23.524 64.424 (delta_t = 87.948 [sec])
Background time interval of the image:
-239.912 -23.524 (delta_t = 216.388 [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 -23.524 sec. to 64.424 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86845 ( -0.0878292 0.0889919 )
Norm@50keV : 3.32155E-03 ( -0.000160717 0.000159506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.68 using 59 PHA bins.
# Reduced chi-squared = 0.7313 for 57 degrees of freedom
# Null hypothesis probability = 9.362392e-01
Photon flux (15-150 keV) in 87.95 sec: 0.470421 ( -0.0219188 0.0220135 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68562e-06 ( -1.29615e-07 1.30294e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -23.524 sec. to 64.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86967 ( -0.0900368 0.40065 )
Epeak [keV] : 9999.25 ( )
Norm@50keV : 3.31675E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.69 using 59 PHA bins.
# Reduced chi-squared = 0.7444 for 56 degrees of freedom
# Null hypothesis probability = 9.227835e-01
Photon flux (15-150 keV) in 87.95 sec: 0.470192 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68433e-06 ( -1.31652e-07 1.24766e-07 ) ergs/cm2
Band function
Time interval is from -23.524 sec. to 64.424 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36785 ( 1.36287 1.36287 )
beta : -1.87356 ( 1.87349 0.09139 )
Epeak [keV] : 28.0656 ( -27.7044 -27.7044 )
Norm@50keV : 8.25979E-03 ( -0.00526478 798235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.60 using 59 PHA bins.
# Reduced chi-squared = 0.7564 for 55 degrees of freedom
# Null hypothesis probability = 9.089125e-01
Photon flux (15-150 keV) in 87.95 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] : 12.1358 ( )
R^2/D10^2 : 9.99482E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 197.24 using 59 PHA bins.
# Reduced chi-squared = 3.4603 for 57 degrees of freedom
# Null hypothesis probability = 2.429897e-17
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.741e-07 2.278e-08
25- 50 8.739e-07 4.609e-08
50-150 7.797e-07 8.052e-08
15-150 1.928e-06 1.042e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.3252 (-16.0573 21.6436)
Norm : 2.03008 (-0.140265 0.156377)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.666e-07 3.927e-08
25- 50 8.041e-07 4.283e-08
50-150 1.291e-06 3.421e-07
15-150 2.561e-06 3.566e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.78288 (-0.727451 0.809864)
R1^2/D10^2 : 1.23402 (-0.49025 0.901016)
kT2 [keV] : 23.2207 (-3.05812 4.26623)
R2^2/D10^2 : 7.16572E-03 (-0.0032894 0.00505624)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.178e-07 7.559e-08
25- 50 7.540e-07 7.990e-08
50-150 1.379e-06 2.023e-07
15-150 2.651e-06 3.113e-07
Peak spectrum fit
Power-law model
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57388 ( -0.260059 0.271003 )
Norm@50keV : 9.17546E-03 ( -0.00146893 0.00144221 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.25 using 59 PHA bins.
# Reduced chi-squared = 0.9166 for 57 degrees of freedom
# Null hypothesis probability = 6.536292e-01
Photon flux (15-150 keV) in 1 sec: 1.16975 ( -0.176609 0.176794 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.60955e-08 ( -1.48066e-08 1.49852e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00167 ( -0.0164637 0.0164637 )
Epeak [keV] : 0.680515 ( -0.0364928 0.0829812 )
Norm@50keV : 5.41207E-03 ( -0.00181648 0.00177437 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.01 using 59 PHA bins.
# Reduced chi-squared = 0.9288 for 56 degrees of freedom
# Null hypothesis probability = 6.265941e-01
Photon flux (15-150 keV) in 1 sec: 1.16799 ( -0.179985 0.17795 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58279e-08 ( -1.53482e-08 1.52461e-08 ) ergs/cm2
Band function
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.24766 ( 7.24307 2.24766 )
beta : -1.57388 ( -0.271003 0.260057 )
Epeak [keV] : 110.231 ( -110.231 -110.231 )
Norm@50keV : 1.24707 ( -0.199655 0.196018 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.25 using 59 PHA bins.
# Reduced chi-squared = 0.9500 for 55 degrees of freedom
# Null hypothesis probability = 5.804380e-01
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] : 14.2972 (-2.77481 3.63596)
R^2/D10^2 : 0.154327 (-0.0845226 0.176514)
(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 6.649e-09 2.170e-09
25- 50 2.525e-08 5.375e-09
50-150 3.434e-08 1.090e-08
15-150 6.623e-08 1.491e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.075 (-100.66 -199.129)
Norm : 4.75916 (-0.708389 0.816338)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.185e-08 6.790e-09
25- 50 2.280e-08 1.271e-08
50-150 4.997e-08 2.793e-08
15-150 8.462e-08 4.801e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.78849 (-1.4243 6.62966)
R1^2/D10^2 : 73.8792 (-68.9085 20505.9)
kT2 [keV] : 18.6398 (-4.26094 40.1607)
R2^2/D10^2 : 5.62404E-02 (-0.0408403 0.0693327)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.251e-08 5.965e-09
25- 50 1.932e-08 8.092e-09
50-150 4.666e-08 1.832e-08
15-150 7.849e-08 2.920e-08
Plot creation:
Fri Sep 26 19:33:39 EDT 2025