batgrbproduct analysis for trigger=1344131
batgrbproduct Analysis for Trigger=1344131
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 22 15:56:18 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1344131/GCN5_download_cron
======================================================================
Trigger: 01344131 Segment: 000
BAT Trigger Time: 777466013.504 [s; MET]
Trigger Stop: 777466014.528 [s; MET]
UTC: 2025-08-21T10:46:17.318700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 358.412197919316 Dec: -28.6182338404795 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.65
Image Trigger?: NO
Rate S/N Ratio: 28.1424945589406 [ if not an image trigger ]
Image S/N Ratio: 6.65
Flight Position: [ source = BAT ]
RA: 358.412197919316 Dec: -28.6182338404795 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 358.427336062087 Dec: -28.6314657737187 [deg; J2000]
{ 23h 53m 42.6s , -28d 37' 53.3" }
+/- 2.12839413965071 [arcmin] (estimated 90% radius based on SNR)
+/- 1.15252957916936 [arcmin] (formal 1-sigma fit error)
SNR: 10.3388584139539
Angular difference between Flight and Ground position is 1.125143 arcmin
Partial Coding Fraction: 0.640625 [ including projection effects ]
Duration
T90: 1.5239999294281 +/- 0.373250525983285
Measured from: -0.387999773025513
to: 1.13600015640259 [s; relative to TRIGTIME]
T50: 0.796000003814697 +/- 0.336933272884171
Measured from: 0.0920001268386841
to: 0.888000130653381 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0640000104904175
to: 1.06400001049042 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.459999918937683
to: 1.20000004768372 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.039958 0.040775 0.063118 0.044709
0.010355 0.010894 0.010334 0.009234 [error]
Peak 0.030417 0.030989 0.038660 0.030427
0.008158 0.008671 0.008237 0.007347 [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 7.60e-09 2.11e-08 4.75e-08 2.84e-07 1.28e-07 3.60e-07 erg/cm2
Error 3.76e-09 5.95e-09 9.53e-09 1.58e-07 2.59e-08 1.60e-07 erg/cm2
Peak flux Power-law 1.87e-01 2.64e-01 2.76e-01 5.31e-01 8.94e-01 1.26e+00 ph/cm2/s
Error 1.03e-01 8.44e-02 6.45e-02 3.24e-01 2.08e-01 3.18e-01 ph/cm2/s
Fluence Cutoff-PL 7.43e-09 2.09e-08 4.74e-08 2.88e-07 1.28e-07 3.57e-07 erg/cm2
Error 3.70e-09 5.95e-09 9.55e-09 2.18e-07 1.92e-08 1.42e-07 erg/cm2
Peak flux Cutoff-PL 2.00e-01 2.72e-01 2.73e-01 4.95e-01 9.03e-01 1.23e+00 ph/cm2/s
Error 1.04e-01 8.48e-02 6.51e-02 3.50e-01 2.09e-01 3.43e-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 0.831 0.413 - - 6.68e-03 1.41e-03 44.520 57
CPL 0.845 0.417 9999.4 0.0 6.76e-03 3.79e-03 44.550 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.936 0.481 - - 7.79e-03 1.80e-03 47.190 57
CPL 0.932 0.487 10000.0 0.0 7.84e-03 -2.99e-03 47.220 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: 1.344000 sec.
T50 in the 50-300 keV band: 0.704000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.660 -0.460 1.200
T90 1.524 -0.388 1.136
T50 0.796 0.092 0.888
Peak 1.000 0.064 1.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
358.4273 -28.6315 0.0186 33.8 168.5 0.2079 10.3 TRIG_01344131
------------------------------------------
Foreground time interval of the image:
-0.460 1.200 (delta_t = 1.660 [sec])
Background time interval of the image:
-239.504 -0.460 (delta_t = 239.044 [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 -0.460 sec. to 1.200 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.830902 ( -0.43425 0.391466 )
Norm@50keV : 6.68355E-03 ( -0.00144825 0.00136588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.52 using 59 PHA bins.
# Reduced chi-squared = 0.7810 for 57 degrees of freedom
# Null hypothesis probability = 8.856711e-01
Photon flux (15-150 keV) in 1.66 sec: 0.767460 ( -0.156177 0.157637 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27998e-07 ( -2.58766e-08 2.60168e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.460 sec. to 1.200 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.844748 ( -0.458938 0.375512 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 6.75854E-03 ( -0.00131365 0.00626343 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.55 using 59 PHA bins.
# Reduced chi-squared = 0.7955 for 56 degrees of freedom
# Null hypothesis probability = 8.647874e-01
Photon flux (15-150 keV) in 1.66 sec: 0.772311 ( -0.16187 0.15309 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27856e-07 ( -2.57278e-08 1.26802e-08 ) ergs/cm2
Band function
Time interval is from -0.460 sec. to 1.200 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.832983 ( 0.833388 0.833388 )
beta : -0.831091 ( -0.391351 0.434222 )
Epeak [keV] : 13.8080 ( -13.8035 -13.8035 )
Norm@50keV : 1.01233E-02 ( -0.00484414 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.52 using 59 PHA bins.
# Reduced chi-squared = 0.8094 for 55 degrees of freedom
# Null hypothesis probability = 8.429442e-01
Photon flux (15-150 keV) in 1.66 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] : 30.2776 (-8.95981 17.612)
R^2/D10^2 : 1.06278E-02 (-0.0074059 0.0191781)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.26 using 59 PHA bins.
# Reduced chi-squared = 0.9168 for 57 degrees of freedom
# Null hypothesis probability = 6.532965e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.516e-09 1.258e-09
25- 50 1.558e-08 7.108e-09
50-150 1.005e-07 4.230e-08
15-150 1.186e-07 5.092e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-53.9081 -200)
Norm : 3.19587 (-0.647085 0.647085)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.321e-08 7.791e-09
25- 50 2.541e-08 1.448e-08
50-150 5.573e-08 3.218e-08
15-150 9.435e-08 5.495e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.81945 (-8.39124 8.15997)
R1^2/D10^2 : 0.214274 (-0.197899 0.748194)
kT2 [keV] : 84.1828 (-54.6717 -79.9426)
R2^2/D10^2 : 8.02611E-04 (-0.000721504 0.00416664)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.161e-08 6.472e-09
25- 50 1.448e-08 6.978e-09
50-150 1.063e-07 6.228e-08
15-150 1.324e-07 6.904e-08
Peak spectrum fit
Power-law model
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.935847 ( -0.510816 0.451407 )
Norm@50keV : 7.78726E-03 ( -0.00185199 0.00175485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.19 using 59 PHA bins.
# Reduced chi-squared = 0.8280 for 57 degrees of freedom
# Null hypothesis probability = 8.195694e-01
Photon flux (15-150 keV) in 1 sec: 0.894263 ( -0.206994 0.208287 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.62137e-08 ( -2.03665e-08 2.05433e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.931783 ( -0.546894 0.426267 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 7.83774E-03 ( -0.00185244 -0.00783771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.22 using 59 PHA bins.
# Reduced chi-squared = 0.8432 for 56 degrees of freedom
# Null hypothesis probability = 7.921110e-01
Photon flux (15-150 keV) in 1 sec: 0.902722 ( -0.217272 0.200628 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.59292e-08 ( -2.01088e-08 1.95518e-08 ) ergs/cm2
Band function
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.855571 ( 0.855491 0.855491 )
beta : -0.936830 ( -0.45067 0.511626 )
Epeak [keV] : 14.4527 ( -14.2046 -14.2046 )
Norm@50keV : 1.15888E-02 ( -0.00549354 1.31324 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.19 using 59 PHA bins.
# Reduced chi-squared = 0.8581 for 55 degrees of freedom
# Null hypothesis probability = 7.637382e-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] : 29.4335 (-11.8855 29.8427)
R^2/D10^2 : 1.27546E-02 (-0.0124033 0.0465494)
(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 1.749e-09 1.099e-09
25- 50 1.070e-08 6.450e-09
50-150 6.597e-08 3.421e-08
15-150 7.843e-08 4.139e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-71.3975 -200)
Norm : 3.71975 (-0.847948 0.847948)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.268e-09 5.560e-09
25- 50 1.783e-08 1.048e-08
50-150 3.910e-08 2.321e-08
15-150 6.620e-08 3.913e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.63089 (-3.62713 6.08368)
R1^2/D10^2 : 0.325977 (-0.250104 1.75321)
kT2 [keV] : 198.517 (-159.732 -198.538)
R2^2/D10^2 : 2.33618E-04 (-8.05282e-05 0.0041799)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.593e-09 4.206e-09
25- 50 1.646e-08 9.515e-09
50-150 6.972e-08 6.405e-08
15-150 9.277e-08 6.485e-08
Plot creation:
Fri Aug 22 15:59:44 EDT 2025