batgrbproduct analysis for trigger=1339848
batgrbproduct Analysis for Trigger=1339848
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): Wed Aug 6 11:07:20 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1339848/GCN5_download_cron
======================================================================
Trigger: 01339848 Segment: 000
BAT Trigger Time: 776066984.96 [s; MET]
Trigger Stop: 776066985.984 [s; MET]
UTC: 2025-08-05T06:09:08.869860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 24.1534268197707 Dec: -81.4065556494068 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.91
Image Trigger?: NO
Rate S/N Ratio: 16.8226038412607 [ if not an image trigger ]
Image S/N Ratio: 8.91
Flight Position: [ source = BAT ]
RA: 24.1534268197707 Dec: -81.4065556494068 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 24.1430331110093 Dec: -81.4018302933031 [deg; J2000]
{ 01h 36m 34.3s , -81d 24' 06.6" }
+/- 1.37767050590081 [arcmin] (estimated 90% radius based on SNR)
+/- 0.579886075456835 [arcmin] (formal 1-sigma fit error)
SNR: 19.2459473362726
Angular difference between Flight and Ground position is 0.298450 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 80.4559999704361 +/- 12.9992966059571
Measured from: -53.4559999704361
to: 27 [s; relative to TRIGTIME]
T50: 22.460000038147 +/- 5.5007828722284
Measured from: -15.2999999523163
to: 7.16000008583069 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.46399998664856
to: 1.46399998664856 [s; relative to TRIGTIME]
Total Fluence
Measured from: -61.7120000123978
to: 36.2519999742508 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.948199 1.554195 1.065021 0.213522
0.077620 0.081313 0.069500 0.059648 [error]
Peak 0.040312 0.086419 0.078138 0.010777
0.008992 0.010030 0.008763 0.006705 [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 3.49e-07 6.12e-07 8.20e-07 2.25e-06 2.38e-06 4.04e-06 erg/cm2
Error 3.60e-08 3.97e-08 6.64e-08 3.80e-07 1.62e-07 4.35e-07 erg/cm2
Peak flux Power-law 5.19e-01 5.72e-01 4.49e-01 5.82e-01 1.76e+00 2.12e+00 ph/cm2/s
Error 1.15e-01 8.22e-02 6.64e-02 1.67e-01 2.34e-01 2.79e-01 ph/cm2/s
Fluence Cutoff-PL 2.99e-07 6.79e-07 8.55e-07 6.32e-07 2.22e-06 2.47e-06 erg/cm2
Error 4.26e-08 5.26e-08 7.64e-08 3.65e-07 1.81e-07 3.96e-07 erg/cm2
Peak flux Cutoff-PL 3.81e-01 6.63e-01 5.18e-01 1.53e-01 1.68e+00 1.71e+00 ph/cm2/s
Error 1.36e-01 1.08e-01 8.48e-02 1.30e-01 2.40e-01 2.66e-01 ph/cm2/s
Fluence Band 2.80e-07 7.08e-07 8.06e-07 1.35e-06 2.25e-06 3.15e-06 erg/cm2
Error 4.75e-08 6.13e-08 8.08e-08 -------- 1.78e-07 -------- erg/cm2
Peak flux Band 3.25e-01 6.93e-01 4.55e-01 3.92e-01 1.64e+00 1.86e+00 ph/cm2/s
Error 1.48e-01 -------- -------- -------- 2.41e-01 3.66e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.577 0.103 - - 2.62e-03 1.67e-04 66.040 57
CPL 0.572 0.524 68.6 15.9 8.69e-03 5.91e-03 52.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.347 0.197 - - 1.46e-02 1.89e-03 58.600 57
CPL -0.321 1.177 70.8 23.8 9.86e-02 2.16e-01 49.700 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: 78.272000 sec.
T50 in the 50-300 keV band: 26.432000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 97.964 -61.712 36.252
T90 80.456 -53.456 27.000
T50 22.460 -15.300 7.160
Peak 1.000 0.464 1.464
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
24.1430 -81.4018 0.0100 35.2 3.0 4.0387 19.2 TRIG_01339848
------------------------------------------
Foreground time interval of the image:
-61.712 -49.010 (delta_t = 12.702 [sec])
-47.960 36.252 (delta_t = 84.212 [sec])
Background time interval of the image:
-158.859 -61.712 (delta_t = 97.147 [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
Multiple GTIs in the spectrum
tstart tstop
-61.712000 -49.010000
-47.960000 36.252000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57694 ( -0.103206 0.103757 )
Norm@50keV : 2.62267E-03 ( -0.000167254 0.00016682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.04 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.929216e-01
Photon flux (15-150 keV) in 96.91 sec: 0.334662 ( -0.0214495 0.0214815 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38393e-06 ( -1.6189e-07 1.62647e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-61.712000 -49.010000
-47.960000 36.252000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.572150 ( -0.557316 0.491329 )
Epeak [keV] : 68.6369 ( -10.017 21.8204 )
Norm@50keV : 8.68649E-03 ( -0.00379362 0.00803255 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.41 using 59 PHA bins.
# Reduced chi-squared = 0.9359 for 56 degrees of freedom
# Null hypothesis probability = 6.115988e-01
Photon flux (15-150 keV) in 96.91 sec: 0.321269 ( -0.022403 0.02241 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21532e-06 ( -1.8001e-07 1.81667e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-61.712000 -49.010000
-47.960000 36.252000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.77494E-03 ( -0.784598 2.90761 )
beta : -2.13154 ( -2.02065 0.340216 )
Epeak [keV] : 54.5687 ( -17.6732 20.7348 )
Norm@50keV : 1.92670E-02 ( -0.0239439 1.87952 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.75 using 59 PHA bins.
# Reduced chi-squared = 0.9045 for 55 degrees of freedom
# Null hypothesis probability = 6.749711e-01
Photon flux (15-150 keV) in 96.91 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25277e-06 ( -2.25209e-06 -1.794e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.8684 (-0.940734 1.02636)
R^2/D10^2 : 5.07512E-02 (-0.0116903 0.014869)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.98 using 59 PHA bins.
# Reduced chi-squared = 1.403 for 57 degrees of freedom
# Null hypothesis probability = 2.400818e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.000e-07 2.369e-08
25- 50 7.368e-07 6.052e-08
50-150 9.286e-07 1.321e-07
15-150 1.865e-06 1.366e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 170.908 (-43.5803 -170.906)
Norm : 1.38419 (-0.0944421 0.10342)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.402e-07 2.951e-08
25- 50 6.421e-07 9.371e-08
50-150 1.334e-06 5.572e-07
15-150 2.316e-06 6.658e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.50459 (-2.15353 1.82355)
R1^2/D10^2 : 0.139365 (-0.0542125 0.130238)
kT2 [keV] : 29.9670 (-9.57351 37.8021)
R2^2/D10^2 : 1.90793E-03 (-0.00172635 0.0071367)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.697e-07 5.684e-08
25- 50 7.232e-07 1.575e-07
50-150 1.270e-06 5.240e-07
15-150 2.263e-06 6.575e-07
Peak spectrum fit
Power-law model
Time interval is from 0.464 sec. to 1.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34742 ( -0.197581 0.195745 )
Norm@50keV : 1.45849E-02 ( -0.00188557 0.00188481 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.60 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.163951e-01
Photon flux (15-150 keV) in 1 sec: 1.75616 ( -0.233656 0.234226 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42532e-07 ( -1.97117e-08 1.98247e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.464 sec. to 1.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.320570 ( -1.33632 1.01868 )
Epeak [keV] : 70.7560 ( -12.9493 34.6318 )
Norm@50keV : 9.86357E-02 ( -0.0986366 0.333104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.70 using 59 PHA bins.
# Reduced chi-squared = 0.8875 for 56 degrees of freedom
# Null hypothesis probability = 7.107609e-01
Photon flux (15-150 keV) in 1 sec: 1.68181 ( -0.2402 0.24025 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31086e-07 ( -2.0793e-08 2.1328e-08 ) ergs/cm2
Band function
Time interval is from 0.464 sec. to 1.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.566256 ( -1.24553 -0.637655 )
beta : -2.49818 ( 2.488 0.916098 )
Epeak [keV] : 65.5859 ( -25.8803 29.5016 )
Norm@50keV : 0.136965 ( -0.15075 56.858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.19 using 59 PHA bins.
# Reduced chi-squared = 0.8943 for 55 degrees of freedom
# Null hypothesis probability = 6.953346e-01
Photon flux (15-150 keV) in 1 sec: 1.64314 ( 5.35686 -0.24006 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3293e-07 ( -1.32923e-07 -2.0981e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.1436 (-1.99514 2.37588)
R^2/D10^2 : 0.173109 (-0.0669488 0.102497)
(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 9.309e-09 2.379e-09
25- 50 3.947e-08 7.810e-09
50-150 7.215e-08 1.705e-08
15-150 1.209e-07 2.179e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-52.7661 -200)
Norm : 7.39437 (-0.954146 0.954146)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.842e-08 1.043e-08
25- 50 3.543e-08 1.974e-08
50-150 7.771e-08 4.298e-08
15-150 1.316e-07 7.300e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 80.8568 (-82.4719 -82.4719)
R1^2/D10^2 : 4.77611E-04 (-0.000440458 0.186237)
kT2 [keV] : 13.9483 (-13.982 3.09457)
R2^2/D10^2 : 0.253585 (-0.252012 0.242952)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.162e-08 7.330e-09
25- 50 3.955e-08 2.644e-08
50-150 8.085e-08 4.721e-08
15-150 1.320e-07 7.315e-08
Plot creation:
Wed Aug 6 11:10:51 EDT 2025