batgrbproduct analysis for trigger=1324646
batgrbproduct Analysis for Trigger=1324646
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): Mon Jun 16 20:03:43 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1324646/GCN5_download_cron
======================================================================
Trigger: 01324646 Segment: 000
BAT Trigger Time: 771719155.392 [s; MET]
Trigger Stop: 771719156.416 [s; MET]
UTC: 2025-06-15T22:25:19.598540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 290.343801566507 Dec: 4.67246531517887 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.04
Image Trigger?: NO
Rate S/N Ratio: 18.3030052177231 [ if not an image trigger ]
Image S/N Ratio: 7.04
Flight Position: [ source = BAT ]
RA: 290.343801566507 Dec: 4.67246531517887 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 290.383816145048 Dec: 4.67890229222546 [deg; J2000]
{ 19h 21m 32.1s , +04d 40' 44.0" }
+/- 0.874440089806397 [arcmin] (estimated 90% radius based on SNR)
+/- 0.325055377002514 [arcmin] (formal 1-sigma fit error)
SNR: 36.843523012983
Angular difference between Flight and Ground position is 2.423853 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 52.4879999160767 +/- 10.3409231959651
Measured from: -3.38399982452393
to: 49.1040000915527 [s; relative to TRIGTIME]
T50: 18.8719999790192 +/- 3.84629694161518
Measured from: 1.74000012874603
to: 20.6120001077652 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.28799998760223
to: 4.28799998760223 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.24000000953674
to: 77.336000084877 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.441368 1.848958 1.759830 0.675285
0.069037 0.072812 0.063655 0.051600 [error]
Peak 0.163681 0.184848 0.122127 0.040310
0.012521 0.012744 0.010873 0.008308 [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 3.73e-07 8.15e-07 1.40e-06 5.58e-06 3.84e-06 8.17e-06 erg/cm2
Error 3.22e-08 4.00e-08 6.36e-08 6.16e-07 1.61e-07 6.41e-07 erg/cm2
Peak flux Power-law 1.55e+00 1.39e+00 8.54e-01 7.97e-01 4.14e+00 4.60e+00 ph/cm2/s
Error 2.00e-01 1.09e-01 9.40e-02 1.79e-01 3.21e-01 3.52e-01 ph/cm2/s
Fluence Cutoff-PL 3.69e-07 8.20e-07 1.40e-06 5.16e-06 3.84e-06 7.75e-06 erg/cm2
Error 3.22e-08 4.08e-08 6.37e-08 -------- 1.60e-07 -------- erg/cm2
Peak flux Cutoff-PL 1.56e+00 1.39e+00 8.52e-01 7.86e-01 4.14e+00 4.59e+00 ph/cm2/s
Error 2.02e-01 1.09e-01 9.35e-02 2.56e-01 3.20e-01 2.87e-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 1.217 0.077 - - 4.70e-03 1.85e-04 71.060 57
CPL 1.214 0.077 9999.4 0.0 4.72e-03 2.97e-04 71.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.702 0.144 - - 3.11e-02 2.59e-03 62.150 57
CPL 1.704 0.145 9999.4 -0.0 3.11e-02 1.31e-02 62.160 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: 50.112000 sec.
T50 in the 50-300 keV band: 17.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 82.576 -5.240 77.336
T90 52.488 -3.384 49.104
T50 18.872 1.740 20.612
Peak 1.000 3.288 4.288
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
290.3838 +4.6789 0.0052 24.3 60.9 3.1861 36.8 TRIG_01324646
------------------------------------------
Foreground time interval of the image:
-5.240 9.509 (delta_t = 14.749 [sec])
Background time interval of the image:
-239.392 -143.622 (delta_t = 95.770 [sec])
-142.392 -5.240 (delta_t = 137.152 [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
-5.240000 65.898000
67.608000 77.336000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21670 ( -0.0771163 0.0765041 )
Norm@50keV : 4.70290E-03 ( -0.000185267 0.000184857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.06 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 57 degrees of freedom
# Null hypothesis probability = 9.967427e-02
Photon flux (15-150 keV) in 80.87 sec: 0.553356 ( -0.0234561 0.023592 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84059e-06 ( -1.60438e-07 1.61096e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-5.240000 65.898000
67.608000 77.336000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21392 ( -0.0791836 0.0755612 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.72492E-03 ( -0.000183797 0.000409263 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.21 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 56 degrees of freedom
# Null hypothesis probability = 8.284941e-02
Photon flux (15-150 keV) in 80.87 sec: 0.554296 ( -0.024865 0.022516 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84471e-06 ( -1.64109e-07 1.55448e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-5.240000 65.898000
67.608000 77.336000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.965406 ( 0.965525 0.965525 )
beta : -1.21668 ( -0.0765004 0.0771345 )
Epeak [keV] : 48.2734 ( -48.1855 -48.1855 )
Norm@50keV : 8.70491E-03 ( -0.00311116 0.655619 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.06 using 59 PHA bins.
# Reduced chi-squared = 1.292 for 55 degrees of freedom
# Null hypothesis probability = 7.135177e-02
Photon flux (15-150 keV) in 80.87 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] : 21.3138 ( )
R^2/D10^2 : 1.97097E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 260.58 using 59 PHA bins.
# Reduced chi-squared = 4.5715 for 57 degrees of freedom
# Null hypothesis probability = 8.309059e-28
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.359e-07 1.096e-08
25- 50 7.051e-07 4.751e-08
50-150 2.390e-06 1.468e-07
15-150 3.231e-06 1.621e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 2.34586 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.724e-07 2.224e-08
25- 50 9.087e-07 4.205e-08
50-150 1.993e-06 8.572e-08
15-150 3.374e-06 1.581e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.28484 (-0.96339 1.07874)
R1^2/D10^2 : 0.473213 (-0.180549 0.325163)
kT2 [keV] : 37.4092 (-4.91332 7.23341)
R2^2/D10^2 : 2.98669E-03 (-0.00118524 0.00159801)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.851e-07 5.499e-08
25- 50 8.072e-07 8.047e-08
50-150 2.778e-06 3.279e-07
15-150 3.971e-06 3.922e-07
Peak spectrum fit
Power-law model
Time interval is from 3.288 sec. to 4.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70183 ( -0.142323 0.145246 )
Norm@50keV : 3.11197E-02 ( -0.00260666 0.00257394 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.15 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.979163e-01
Photon flux (15-150 keV) in 1 sec: 4.13568 ( -0.320919 0.321399 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.8809e-07 ( -2.53198e-08 2.55662e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.288 sec. to 4.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70427 ( -0.146775 0.142611 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 3.10971E-02 ( -0.00924612 0.0169416 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.16 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 56 degrees of freedom
# Null hypothesis probability = 2.662287e-01
Photon flux (15-150 keV) in 1 sec: 4.13631 ( -0.32057 0.31909 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.87607e-07 ( -2.5013e-08 2.5845e-08 ) ergs/cm2
Band function
Time interval is from 3.288 sec. to 4.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23868 ( 1.22172 1.22172 )
beta : -1.70911 ( 1.70934 0.148331 )
Epeak [keV] : 37.0480 ( -35.6431 -35.6431 )
Norm@50keV : 7.19306E-02 ( -0.0524863 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.09 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 55 degrees of freedom
# Null hypothesis probability = 2.382217e-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] : 12.6343 ( )
R^2/D10^2 : 0.806526 ( )
(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 2.730e-08 3.885e-09
25- 50 9.114e-08 8.150e-09
50-150 9.041e-08 1.635e-08
15-150 2.088e-07 2.015e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 143.247 (-45.3704 -142.323)
Norm : 16.9625 (-1.51605 1.84913)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.373e-08 4.815e-09
25- 50 8.050e-08 1.169e-08
50-150 1.559e-07 6.653e-08
15-150 2.801e-07 7.720e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.08512 (-1.3582 1.7254)
R1^2/D10^2 : 8.55669 (-4.98788 14.0488)
kT2 [keV] : 26.3657 (-6.57639 14.1621)
R2^2/D10^2 : 4.59767E-02 (-0.0342902 0.0549865)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.834e-08 1.545e-08
25- 50 7.557e-08 1.774e-08
50-150 1.647e-07 6.017e-08
15-150 2.886e-07 8.750e-08
Plot creation:
Mon Jun 16 20:08:54 EDT 2025