batgrbproduct analysis for trigger=1315630
batgrbproduct Analysis for Trigger=1315630
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 May 28 13:50:23 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1315630/batgroup_hand_proc
======================================================================
Trigger: 01315630 Segment: 000
BAT Trigger Time: 769401772.48 [s; MET]
Trigger Stop: 769401772.608 [s; MET]
UTC: 2025-05-20T02:42:16.844680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 282.268181373042 Dec: -11.8468720448437 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.73
Image Trigger?: NO
Rate S/N Ratio: 84.2674314311288 [ if not an image trigger ]
Image S/N Ratio: 9.73
Flight Position: [ source = BAT ]
RA: 282.268181373042 Dec: -11.8468720448437 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 282.264882848451 Dec: -11.8524018788243 [deg; J2000]
{ 18h 49m 03.6s , -11d 51' 08.6" }
+/- 1.61868529808749 [arcmin] (estimated 90% radius based on SNR)
+/- 0.504753436581148 [arcmin] (formal 1-sigma fit error)
SNR: 15.286741430122
Angular difference between Flight and Ground position is 0.384190 arcmin
Partial Coding Fraction: 0.6875 [ including projection effects ]
Duration
T90: 0.46399998664856 +/- 0.147512777518617
Measured from: -0.248000025749207
to: 0.215999960899353 [s; relative to TRIGTIME]
T50: 0.128000020980835 +/- 0.0357770535203468
Measured from: 0.00800001621246338
to: 0.136000037193298 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.539999961853027
to: 0.460000038146973 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.328000068664551
to: 0.23199999332428 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.028869 0.062435 0.091674 0.044313
0.007638 0.008192 0.008272 0.007653 [error]
Peak 0.034021 0.070443 0.098728 0.039205
0.009821 0.010017 0.009464 0.008602 [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 7.36e-09 2.44e-08 6.68e-08 5.44e-07 1.83e-07 6.43e-07 erg/cm2
Error 2.23e-09 4.36e-09 7.40e-09 1.56e-07 2.11e-08 1.57e-07 erg/cm2
Peak flux Power-law 3.07e-01 5.03e-01 6.23e-01 1.53e+00 1.86e+00 2.96e+00 ph/cm2/s
Error 9.46e-02 9.35e-02 7.25e-02 4.15e-01 2.35e-01 4.08e-01 ph/cm2/s
Fluence Cutoff-PL 7.37e-09 2.45e-08 6.69e-08 5.39e-07 1.83e-07 6.37e-07 erg/cm2
Error 2.72e-09 4.45e-09 8.85e-09 2.15e-07 2.12e-08 2.30e-07 erg/cm2
Peak flux Cutoff-PL 2.76e-01 4.99e-01 6.44e-01 1.22e+00 1.84e+00 2.64e+00 ph/cm2/s
Error 1.23e-01 9.89e-02 9.34e-02 -------- 2.48e-01 5.28e-01 ph/cm2/s
Fluence Band 6.20e-11 1.54e-10 7.73e-11 4.40e-11 3.22e-10 3.41e-10 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 0.547 0.227 - - 2.49e-02 3.34e-03 48.290 57
CPL 0.537 0.611 10000.0 0.0 2.51e-02 3.08e-03 48.280 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.691 0.232 - - 1.61e-02 2.18e-03 42.770 57
CPL 0.411 0.767 381.0 0.0 2.04e-02 0.00e+00 42.480 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.560 -0.328 0.232
T90 0.464 -0.248 0.216
T50 0.128 0.008 0.136
Peak 1.000 -0.540 0.460
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
282.2649 -11.8524 0.0127 33.3 174.4 0.2323 15.3 TRIG_01315630
------------------------------------------
Foreground time interval of the image:
-0.328 0.232 (delta_t = 0.560 [sec])
Background time interval of the image:
-74.579 -0.328 (delta_t = 74.251 [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 -0.328 sec. to 0.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.547379 ( -0.234603 0.219244 )
Norm@50keV : 2.49098E-02 ( -0.00339169 0.00327955 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.29 using 59 PHA bins.
# Reduced chi-squared = 0.8472 for 57 degrees of freedom
# Null hypothesis probability = 7.876610e-01
Photon flux (15-150 keV) in 0.56 sec: 2.92876 ( -0.344941 0.347181 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83018e-07 ( -2.10718e-08 2.11388e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.328 sec. to 0.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.537324 ( -0.970101 0.252353 )
Epeak [keV] : 9999.99 ( -9999.99 -9999.99 )
Norm@50keV : 2.51184E-02 ( -0.00340602 0.00275724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.28 using 59 PHA bins.
# Reduced chi-squared = 0.8622 for 56 degrees of freedom
# Null hypothesis probability = 7.585698e-01
Photon flux (15-150 keV) in 0.56 sec: 2.91532 ( -0.35386 0.36116 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83081e-07 ( -2.14514e-08 2.10437e-08 ) ergs/cm2
Band function
Time interval is from -0.328 sec. to 0.232 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.866704 ( 0.866704 0.866704 )
beta : -0.547387 ( -0.219232 0.234483 )
Epeak [keV] : 13.4501 ( -13.4501 -13.4501 )
Norm@50keV : 3.76807E-02 ( -0.0159062 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.29 using 59 PHA bins.
# Reduced chi-squared = 0.8780 for 55 degrees of freedom
# Null hypothesis probability = 7.269830e-01
Photon flux (15-150 keV) in 0.56 sec: 9.73395E-03 ( 6.99027 -0.0081315 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.2153e-10 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.4457 (-5.953 8.45341)
R^2/D10^2 : 3.16966E-02 (-0.0136918 0.0216263)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.74 using 59 PHA bins.
# Reduced chi-squared = 0.9780 for 57 degrees of freedom
# Null hypothesis probability = 5.222790e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.015e-09 8.814e-10
25- 50 1.960e-08 3.872e-09
50-150 1.536e-07 3.119e-08
15-150 1.763e-07 3.122e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-18.099 -200)
Norm : 11.4929 (-1.46544 1.46544)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.603e-08 9.131e-09
25- 50 3.084e-08 1.702e-08
50-150 6.763e-08 3.679e-08
15-150 1.145e-07 6.314e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.77043 (-4.9825 7.1857)
R1^2/D10^2 : 0.495331 (-0.391385 5.16327)
kT2 [keV] : 50.2238 (-14.9447 81.0093)
R2^2/D10^2 : 1.08808E-02 (-0.00881078 0.0169088)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.020e-09 4.105e-09
25- 50 2.496e-08 1.304e-08
50-150 1.548e-07 8.137e-08
15-150 1.867e-07 9.509e-08
Peak spectrum fit
Power-law model
Time interval is from -0.540 sec. to 0.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.690921 ( -0.238652 0.224351 )
Norm@50keV : 1.61220E-02 ( -0.00220736 0.00214563 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.77 using 59 PHA bins.
# Reduced chi-squared = 0.7503 for 57 degrees of freedom
# Null hypothesis probability = 9.191678e-01
Photon flux (15-150 keV) in 1 sec: 1.86492 ( -0.233803 0.235983 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97602e-07 ( -2.38037e-08 2.38724e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.540 sec. to 0.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.411089 ( -1.05659 0.476495 )
Epeak [keV] : 380.989 ( -380.989 -380.989 )
Norm@50keV : 2.04326E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.48 using 59 PHA bins.
# Reduced chi-squared = 0.7586 for 56 degrees of freedom
# Null hypothesis probability = 9.087793e-01
Photon flux (15-150 keV) in 1 sec: 1.83827 ( -0.24678 0.24943 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96454e-07 ( -2.4535e-08 2.4314e-08 ) ergs/cm2
Band function
Time interval is from -0.540 sec. to 0.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.817375 ( 0.817375 0.817375 )
beta : -0.690921 ( -0.223985 0.23894 )
Epeak [keV] : 14.9883 ( -14.9883 -14.9883 )
Norm@50keV : 2.37542E-02 ( -0.00968929 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.77 using 59 PHA bins.
# Reduced chi-squared = 0.7776 for 55 degrees of freedom
# Null hypothesis probability = 8.851319e-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] : 30.5578 (-5.04959 6.94436)
R^2/D10^2 : 2.69567E-02 (-0.0116435 0.0185555)
(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 3.893e-09 1.136e-09
25- 50 2.420e-08 5.945e-09
50-150 1.584e-07 3.205e-08
15-150 1.865e-07 3.335e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-20.4471 -200)
Norm : 7.70180 (-0.997073 0.997073)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.919e-08 1.089e-08
25- 50 3.691e-08 2.063e-08
50-150 8.095e-08 4.489e-08
15-150 1.370e-07 7.610e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.31841 (-8.73439 8.16225)
R1^2/D10^2 : 0.366756 (-0.295333 -0.359458)
kT2 [keV] : 41.7431 (-11.9393 55.3301)
R2^2/D10^2 : 1.01732E-02 (-0.00883508 0.0234983)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.525e-09 5.059e-09
25- 50 2.342e-08 6.525e-09
50-150 1.609e-07 3.725e-08
15-150 1.938e-07 4.860e-08
Plot creation:
Wed May 28 13:59:44 EDT 2025