batgrbproduct analysis for trigger=1344586
batgrbproduct Analysis for Trigger=1344586
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 Aug 24 20:23:21 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1344586/GCN5_download_cron
======================================================================
Trigger: 01344586 Segment: 000
BAT Trigger Time: 777672643.712 [s; MET]
Trigger Stop: 777672645.76 [s; MET]
UTC: 2025-08-23T20:10:07.512660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 297.521383211523 Dec: -24.9761879046082 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.48
Image Trigger?: NO
Rate S/N Ratio: 14.422205101856 [ if not an image trigger ]
Image S/N Ratio: 8.48
Flight Position: [ source = BAT ]
RA: 297.521383211523 Dec: -24.9761879046082 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 297.46508462088 Dec: -24.9855139444688 [deg; J2000]
{ 19h 49m 51.6s , -24d 59' 07.9" }
+/- 1.68581299871994 [arcmin] (estimated 90% radius based on SNR)
+/- 0.653717586812462 [arcmin] (formal 1-sigma fit error)
SNR: 14.424639031081
Angular difference between Flight and Ground position is 3.112618 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 193.59199988842 +/- 10.1882239597491
Measured from: -19.3239998817444
to: 174.268000006676 [s; relative to TRIGTIME]
T50: 160.304000020027 +/- 75.6688078789803
Measured from: -2.21999990940094
to: 158.084000110626 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.24000000953674
to: 5.24000000953674 [s; relative to TRIGTIME]
Total Fluence
Measured from: -23.8439999818802
to: 180.815999984741 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.133390 1.155305 0.795824 0.134437
0.097755 0.095773 0.079777 0.068597 [error]
Peak 0.041259 0.048819 0.036882 0.015896
0.008427 0.008249 0.007110 0.005700 [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 3.20e-07 4.99e-07 5.87e-07 1.33e-06 1.80e-06 2.74e-06 erg/cm2
Error 4.38e-08 4.38e-08 7.87e-08 3.69e-07 1.83e-07 4.42e-07 erg/cm2
Peak flux Power-law 3.27e-01 3.64e-01 2.90e-01 3.82e-01 1.12e+00 1.36e+00 ph/cm2/s
Error 1.05e-01 6.96e-02 5.78e-02 1.66e-01 1.92e-01 2.32e-01 ph/cm2/s
Fluence Cutoff-PL 3.09e-07 5.18e-07 5.87e-07 7.82e-07 1.74e-06 2.20e-06 erg/cm2
Error 4.91e-08 5.71e-08 8.31e-08 5.92e-07 2.13e-07 6.31e-07 erg/cm2
Peak flux Cutoff-PL 3.34e-01 3.67e-01 2.87e-01 3.69e-01 1.13e+00 1.36e+00 ph/cm2/s
Error 1.01e-01 6.98e-02 5.83e-02 2.05e-01 1.92e-01 2.63e-01 ph/cm2/s
Fluence Band 3.03e-07 5.24e-07 5.70e-07 1.13e-06 1.75e-06 2.54e-06 erg/cm2
Error -------- -------- 1.06e-07 -------- -------- -------- 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 1.767 0.161 - - 9.51e-04 9.35e-05 49.590 57
CPL 1.462 0.506 78.9 -21.4 1.40e-03 1.25e-03 48.870 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.331 0.307 - - 9.36e-03 1.54e-03 37.480 57
CPL 1.329 0.536 9999.3 0.0 9.39e-03 6.75e-03 37.490 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: 89.856000 sec.
T50 in the 50-300 keV band: 17.408000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 204.660 -23.844 180.816
T90 193.592 -19.324 174.268
T50 160.304 -2.220 158.084
Peak 1.000 4.240 5.240
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
297.4651 -24.9855 0.0134 19.4 62.0 2.0389 14.4 TRIG_01344586
------------------------------------------
Foreground time interval of the image:
-23.844 33.389 (delta_t = 57.233 [sec])
Background time interval of the image:
-78.711 -23.844 (delta_t = 54.867 [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 -23.844 sec. to 180.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76714 ( -0.158821 0.162449 )
Norm@50keV : 9.51465E-04 ( -9.42042e-05 9.28717e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.59 using 59 PHA bins.
# Reduced chi-squared = 0.8699 for 57 degrees of freedom
# Null hypothesis probability = 7.465681e-01
Photon flux (15-150 keV) in 204.7 sec: 0.129476 ( -0.0114504 0.0114599 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79555e-06 ( -1.82087e-07 1.84575e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -23.844 sec. to 180.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46236 ( -0.696668 0.315784 )
Epeak [keV] : 78.9181 ( -36.0806 -78.9192 )
Norm@50keV : 1.40098E-03 ( -0.000548571 0.00194837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.87 using 59 PHA bins.
# Reduced chi-squared = 0.8727 for 56 degrees of freedom
# Null hypothesis probability = 7.391076e-01
Photon flux (15-150 keV) in 204.7 sec: 0.127695 ( -0.012007 0.011973 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73968e-06 ( -2.12041e-07 2.14755e-07 ) ergs/cm2
Band function
Time interval is from -23.844 sec. to 180.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90209 ( -4.90209 -4.90209 )
beta : -1.84733 ( -0.192837 0.178415 )
Epeak [keV] : 22.0772 ( -10.9534 3.94423 )
Norm@50keV : 236.606 ( -20.575 708701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.43 using 59 PHA bins.
# Reduced chi-squared = 0.8624 for 55 degrees of freedom
# Null hypothesis probability = 7.558421e-01
Photon flux (15-150 keV) in 204.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75431e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7400 (-1.28196 1.46807)
R^2/D10^2 : 3.32370E-02 (-0.0117671 0.0179731)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.72 using 59 PHA bins.
# Reduced chi-squared = 1.381 for 57 degrees of freedom
# Null hypothesis probability = 2.989955e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.979e-07 3.305e-08
25- 50 6.069e-07 6.039e-08
50-150 4.955e-07 1.101e-07
15-150 1.300e-06 1.432e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.7588 (-27.0688 64.1889)
Norm : 0.572673 (-0.0721378 0.0735814)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.064e-07 4.022e-08
25- 50 5.295e-07 5.476e-08
50-150 8.570e-07 3.149e-07
15-150 1.693e-06 3.553e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.02123 (-1.56603 1.88679)
R1^2/D10^2 : 0.264012 (-0.157945 0.446099)
kT2 [keV] : 21.4415 (-5.09848 11.6608)
R2^2/D10^2 : 2.73185E-03 (-0.00217228 0.00332133)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.098e-07 1.096e-07
25- 50 5.136e-07 1.612e-07
50-150 8.844e-07 4.792e-07
15-150 1.708e-06 6.288e-07
Peak spectrum fit
Power-law model
Time interval is from 4.240 sec. to 5.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33065 ( -0.308955 0.304482 )
Norm@50keV : 9.35516E-03 ( -0.00154266 0.00154067 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.48 using 59 PHA bins.
# Reduced chi-squared = 0.6576 for 57 degrees of freedom
# Null hypothesis probability = 9.786849e-01
Photon flux (15-150 keV) in 1 sec: 1.12264 ( -0.19162 0.192174 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.17744e-08 ( -1.67644e-08 1.69425e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.240 sec. to 5.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32948 ( -0.768401 0.304182 )
Epeak [keV] : 9999.29 ( -9999.35 -9999.35 )
Norm@50keV : 9.39075E-03 ( -0.00154891 0.0119421 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.49 using 59 PHA bins.
# Reduced chi-squared = 0.6695 for 56 degrees of freedom
# Null hypothesis probability = 9.728973e-01
Photon flux (15-150 keV) in 1 sec: 1.12570 ( -0.195155 0.18907 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.17889e-08 ( -1.67703e-08 1.65921e-08 ) ergs/cm2
Band function
Time interval is from 4.240 sec. to 5.240 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00595 ( 1.00593 6.00134 )
beta : -1.33197 ( 1.33197 0.310019 )
Epeak [keV] : 59.5072 ( -59.5085 -59.5085 )
Norm@50keV : 1.76188E-02 ( -0.00979684 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.48 using 59 PHA bins.
# Reduced chi-squared = 0.6814 for 55 degrees of freedom
# Null hypothesis probability = 9.660148e-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] : 16.8139 (-3.85839 5.68613)
R^2/D10^2 : 8.58170E-02 (-0.0530709 0.124382)
(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 4.956e-09 1.923e-09
25- 50 2.173e-08 6.610e-09
50-150 4.371e-08 1.549e-08
15-150 7.040e-08 1.956e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-71.2474 -200)
Norm : 4.64741 (-0.77291 0.77291)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.157e-08 6.685e-09
25- 50 2.226e-08 1.262e-08
50-150 4.883e-08 2.802e-08
15-150 8.266e-08 4.654e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.80661 (-4.56629 3.73578)
R1^2/D10^2 : 0.427687 (-0.280526 2.84348)
kT2 [keV] : 79.2268 (-58.8642 -84.6165)
R2^2/D10^2 : 8.14336E-04 (-0.000444588 0.0171972)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.700e-09 5.121e-09
25- 50 2.311e-08 1.295e-08
50-150 6.201e-08 3.403e-08
15-150 9.382e-08 4.737e-08
Plot creation:
Sun Aug 24 20:27:13 EDT 2025