batgrbproduct analysis for trigger=1125350
batgrbproduct Analysis for Trigger=1125350
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): Tue Sep 27 07:24:26 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1125350/GCN5_download_cron
======================================================================
Trigger: 01125350 Segment: 000
BAT Trigger Time: 685872664 [s; MET]
Trigger Stop: 685872728 [s; MET]
UTC: 2022-09-26T08:10:34.072960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.925075128708 Dec: -15.8371320617403 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.83
Flight Position: [ source = BAT ]
RA: 244.925075128708 Dec: -15.8371320617403 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.981441339023 Dec: -15.81140277812 [deg; J2000]
{ 16h 19m 55.5s , -15d 48' 41.1" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 4.38678887484741 [arcmin] (formal 1-sigma fit error)
SNR: -2.8217700523529
Angular difference between Flight and Ground position is 3.601448 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 527.619999885559 +/- 62.4594673523249
Measured from: 81.200000166893
to: 608.820000052452 [s; relative to TRIGTIME]
T50: 254.947999954224 +/- 27.479059725424
Measured from: 245.048000097275
to: 499.996000051498 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 410.728000044823
to: 411.728000044823 [s; relative to TRIGTIME]
Total Fluence
Measured from: -183.251999974251
to: 633.56400001049 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 34.230733 2.403790 -0.193209 0.117144
0.266495 0.231850 0.191202 0.161505 [error]
Peak 0.064191 0.023272 0.015647 0.002464
0.008431 0.007087 0.006396 0.005378 [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 1.20e-05 1.17e-06 4.60e-08 1.88e-09 1.32e-05 1.32e-05 erg/cm2
Error 9.52e-07 1.17e-07 1.23e-08 8.65e-10 9.38e-07 9.38e-07 erg/cm2
Peak flux Power-law 6.53e-01 2.10e-01 3.75e-02 7.81e-03 9.05e-01 9.08e-01 ph/cm2/s
Error 1.65e-01 8.80e-02 3.73e-02 1.62e-02 1.94e-01 1.95e-01 ph/cm2/s
Fluence Cutoff-PL 1.12e-05 8.54e-07 2.89e-10 5.22e-18 1.21e-05 1.21e-05 erg/cm2
Error 1.15e-06 1.34e-07 8.59e-10 2.95e-15 1.16e-06 1.16e-06 erg/cm2
Peak flux Cutoff-PL 6.67e-01 1.95e-01 3.10e-02 5.58e-03 8.98e-01 8.99e-01 ph/cm2/s
Error -------- 8.94e-02 4.25e-02 1.63e-02 1.96e-01 1.96e-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 6.665 0.255 - - 6.85e-05 1.51e-05 71.210 57
CPL 1.000 0.000 50.0 0.0 1.21e-03 0.00e+00 740.050 56
The chi2 of BB fit is 42.72 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.481 0.949 - - 2.27e-03 2.10e-03 70.220 57
CPL 1.844 0.000 3.9 0.0 2.09e-02 0.00e+00 74.120 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 816.816 -183.252 633.564
T90 527.620 81.200 608.820
T50 254.948 245.048 499.996
Peak 1.000 410.728 411.728
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.9814 -15.8114 0.0680 23.7 -55.4 -1.7084 -2.8 TRIG_01125350
------------------------------------------
Foreground time interval of the image:
-183.252 71.201 (delta_t = 254.453 [sec])
Background time interval of the image:
-239.000 -183.252 (delta_t = 55.748 [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
-183.252000 353.210000
355.000000 407.150000
408.000000 633.564000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.66505 ( -0.255746 0.254197 )
Norm@50keV : 6.85132E-05 ( -1.36791e-05 1.64564e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.21 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 57 degrees of freedom
# Null hypothesis probability = 9.759980e-02
Photon flux (15-150 keV) in 814.2 sec: 0.554225 ( -0.0425625 0.0430327 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31673e-05 ( -9.33708e-07 9.43316e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-183.252000 353.210000
355.000000 407.150000
408.000000 633.564000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.20533E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 740.05 using 59 PHA bins.
# Reduced chi-squared = 13.215 for 56 degrees of freedom
# Null hypothesis probability = 4.337682e-120
Photon flux (15-150 keV) in 814.2 sec: 0.504193 ( -0.054011 0.052506 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20669e-05 ( -1.17456e-06 1.14159e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-183.252000 353.210000
355.000000 407.150000
408.000000 633.564000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.64634 ( )
beta : -7.38061 ( )
Epeak [keV] : 19.6641 ( )
Norm@50keV : 1.24414E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 652.31 using 59 PHA bins.
# Reduced chi-squared = 11.860 for 55 degrees of freedom
# Null hypothesis probability = 4.742548e-103
Photon flux (15-150 keV) in 814.2 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] : 2.52413 (-0.108648 0.118113)
R^2/D10^2 : 234.454 (-77.9432 113.99)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.72 using 59 PHA bins.
# Reduced chi-squared = 0.7494 for 57 degrees of freedom
# Null hypothesis probability = 9.200330e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.123e-05 1.201e-06
25- 50 8.577e-07 1.242e-07
50-150 2.976e-10 1.463e-10
15-150 1.208e-05 1.303e-06
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.16471 (-0.25073 0.282132)
Norm : 250.943 (-72.3049 99.3638)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.169e-05 1.128e-06
25- 50 9.476e-07 1.264e-07
50-150 1.790e-09 8.366e-10
15-150 1.264e-05 1.352e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.54767 (-0.108638 0.118122)
R1^2/D10^2 : 214.823 (-77.9504 113.981)
kT2 [keV] : 0.644174 (-1.11182 25.3948)
R2^2/D10^2 : 3.26686E+08 (-3.51101e+08 6.46138e+12)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 410.728 sec. to 411.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.48083 ( -0.775089 1.12387 )
Norm@50keV : 2.27334E-03 ( -0.00226961 0.00193237 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.22 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 57 degrees of freedom
# Null hypothesis probability = 1.122135e-01
Photon flux (15-150 keV) in 1 sec: 0.905194 ( -0.1941 0.193726 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.53418e-08 ( -1.00529e-08 1.14636e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 410.728 sec. to 411.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84425 ( )
Epeak [keV] : 3.92777 ( )
Norm@50keV : 2.08875E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.12 using 59 PHA bins.
# Reduced chi-squared = 1.324 for 56 degrees of freedom
# Null hypothesis probability = 5.288717e-02
Photon flux (15-150 keV) in 1 sec: 0.898059 ( -0.189705 0.202831 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4412e-08 ( -9.2064e-09 1.24617e-08 ) ergs/cm2
Band function
Time interval is from 410.728 sec. to 411.728 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.23912 ( 6.23912 6.23912 )
beta : -3.48336 ( -1.12094 0.776545 )
Epeak [keV] : 24.2096 ( -24.2096 -24.2096 )
Norm@50keV : 0.308317 ( -0.30838 0.262711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.22 using 59 PHA bins.
# Reduced chi-squared = 1.277 for 55 degrees of freedom
# Null hypothesis probability = 8.111594e-02
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] : 3.27289 (-0.77466 1.11812)
R^2/D10^2 : 66.2870 (-66.3192 303.492)
(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 2.086e-08 1.183e-08
25- 50 4.081e-09 2.460e-09
50-150 1.292e-11 1.436e-11
15-150 2.496e-08 1.404e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.39840 (-4.35185 20.6167)
Norm : 33.2091 (-25.5536 129.268)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.995e-08 1.110e-08
25- 50 7.890e-09 4.801e-09
50-150 4.550e-10 4.375e-10
15-150 2.830e-08 1.639e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.48378 (-0.734672 0.850506)
R1^2/D10^2 : 320.104 (-272.027 4444.55)
kT2 [keV] : 13.4682 (-4.07296 6.32596)
R2^2/D10^2 : 7.28023E-02 (-0.0574021 0.157201)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.954e-08 1.092e-08
25- 50 1.120e-08 6.585e-09
50-150 1.170e-08 8.135e-09
15-150 4.245e-08 2.269e-08
Plot creation:
Tue Sep 27 07:28:41 EDT 2022