batgrbproduct analysis for trigger=1187142
batgrbproduct Analysis for Trigger=1187142
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): Sat Aug 26 12:38:14 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1187142/GCN5_download_cron
======================================================================
Trigger: 01187142 Segment: 000
BAT Trigger Time: 714647048 [s; MET]
Trigger Stop: 714647192 [s; MET]
UTC: 2023-08-25T09:03:36.111400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.941681607958 Dec: -16.2138321706453 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 26.75
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 26.75
Flight Position: [ source = BAT ]
RA: 261.941681607958 Dec: -16.2138321706453 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 261.938106076473 Dec: -16.2021871339662 [deg; J2000]
{ 17h 27m 45.1s , -16d 12' 07.9" }
+/- 0.585136457692903 [arcmin] (estimated 90% radius based on SNR)
+/- 0.15486371306429 [arcmin] (formal 1-sigma fit error)
SNR: 65.4045789119765
Angular difference between Flight and Ground position is 0.728439 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 215.303999900818 +/- 11.5261407314971
Measured from: -66.0559998750687
to: 149.248000025749 [s; relative to TRIGTIME]
T50: 109.527999997139 +/- 2.76751725258623
Measured from: -30.8959999084473
to: 78.6320000886917 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -22.3279999494553
to: -21.3279999494553 [s; relative to TRIGTIME]
Total Fluence
Measured from: -75.4759999513626
to: 175.276000022888 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 24.468587 21.020438 6.549616 0.609578
0.154282 0.146644 0.116235 0.101612 [error]
Peak 0.154071 0.127189 0.035364 0.010756
0.010206 0.009436 0.006952 0.006298 [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 9.65e-06 8.65e-06 5.35e-06 5.02e-06 2.58e-05 2.87e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 1.64e+00 8.98e-01 3.09e-01 1.38e-01 2.92e+00 2.98e+00 ph/cm2/s
Error 1.87e-01 8.27e-02 5.45e-02 4.41e-02 2.56e-01 2.60e-01 ph/cm2/s
Fluence Cutoff-PL 8.21e-06 8.99e-06 5.28e-06 1.95e-06 2.38e-05 2.44e-05 erg/cm2
Error 4.38e-07 1.87e-07 1.56e-07 3.72e-07 6.24e-07 7.73e-07 erg/cm2
Peak flux Cutoff-PL 1.55e+00 1.01e+00 2.48e-01 2.11e-02 2.83e+00 2.83e+00 ph/cm2/s
Error 2.04e-01 1.15e-01 7.67e-02 3.86e-02 2.62e-01 2.63e-01 ph/cm2/s
Fluence Band 7.96e-06 9.02e-06 5.18e-06 3.09e-06 2.38e-05 2.53e-05 erg/cm2
Error 5.97e-07 2.38e-07 1.51e-07 -------- 6.15e-07 -------- erg/cm2
Peak flux Band 1.60e+00 9.22e-01 2.57e-01 8.81e-02 2.83e+00 2.87e+00 ph/cm2/s
Error 2.16e-01 -------- 6.56e-02 -------- 2.63e-01 2.82e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.695 0.000 - - 9.68e-03 0.00e+00 116.140 57
CPL 1.874 0.154 7.1 0.0 2.55e-02 0.00e+00 53.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.540 0.180 - - 1.45e-02 1.95e-03 58.000 57
CPL 1.280 0.877 19.7 0.0 9.43e-02 0.00e+00 52.040 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 250.752 -75.476 175.276
T90 215.304 -66.056 149.248
T50 109.528 -30.896 78.632
Peak 1.000 -22.328 -21.328
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
261.9381 -16.2022 0.0030 21.8 -136.4 40.6460 65.4 TRIG_01187142
------------------------------------------
Foreground time interval of the image:
-15.699 175.276 (delta_t = 190.975 [sec])
Background time interval of the image:
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 -75.476 sec. to 175.276 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.69475 ( )
Norm@50keV : 9.67522E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 116.14 using 59 PHA bins.
# Reduced chi-squared = 2.0376 for 57 degrees of freedom
# Null hypothesis probability = 6.276532e-06
Photon flux (15-150 keV) in 250.8 sec: 2.15190 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57669e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -75.476 sec. to 175.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87363 ( -0.191172 0.117003 )
Epeak [keV] : 7.11752 ( )
Norm@50keV : 2.54681E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.16 using 59 PHA bins.
# Reduced chi-squared = 0.9492 for 56 degrees of freedom
# Null hypothesis probability = 5.831382e-01
Photon flux (15-150 keV) in 250.8 sec: 1.95510 ( -0.06644 0.06731 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38243e-05 ( -6.21934e-07 6.26022e-07 ) ergs/cm2
Band function
Time interval is from -75.476 sec. to 175.276 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.68873 ( -0.307435 0.962302 )
beta : -3.21162 ( 3.21404 0.298125 )
Epeak [keV] : 13.6763 ( -8.75029 10.8261 )
Norm@50keV : 3.27550E-02 ( -0.0106384 0.104943 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.05 using 59 PHA bins.
# Reduced chi-squared = 0.9463 for 55 degrees of freedom
# Null hypothesis probability = 5.882343e-01
Photon flux (15-150 keV) in 250.8 sec: 1.65880 ( 5.3412 -0.06567 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37768e-05 ( -2.3775e-05 -6.12755e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.72493 ( )
R^2/D10^2 : 0.815350 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 533.94 using 59 PHA bins.
# Reduced chi-squared = 9.3673 for 57 degrees of freedom
# Null hypothesis probability = 1.182411e-78
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.899e-06 1.480e-07
25- 50 9.314e-06 2.107e-07
50-150 4.482e-06 1.718e-07
15-150 1.769e-05 3.662e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.9332 (-1.3361 1.41368)
Norm : 13.1228 (-0.601809 0.630257)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.267e-06 2.245e-07
25- 50 9.108e-06 1.806e-07
50-150 6.240e-06 2.132e-07
15-150 2.261e-05 4.239e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.72281 (-0.353668 0.360804)
R1^2/D10^2 : 6.16714 (-1.38525 1.93327)
kT2 [keV] : 15.7685 (-0.981444 1.15858)
R2^2/D10^2 : 6.50161E-02 (-0.0193495 0.0248936)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.109e-06 4.866e-07
25- 50 9.124e-06 3.436e-07
50-150 6.462e-06 3.361e-07
15-150 2.270e-05 8.765e-07
Peak spectrum fit
Power-law model
Time interval is from -22.328 sec. to -21.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.53975 ( -0.175419 0.185231 )
Norm@50keV : 1.45022E-02 ( -0.00195303 0.00194125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.00 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.381751e-01
Photon flux (15-150 keV) in 1 sec: 2.91971 ( -0.256399 0.256495 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46622e-07 ( -1.46861e-08 1.49432e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -22.328 sec. to -21.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28042 ( -1.12536 0.628327 )
Epeak [keV] : 19.6674 ( )
Norm@50keV : 9.42827E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.04 using 59 PHA bins.
# Reduced chi-squared = 0.9294 for 56 degrees of freedom
# Null hypothesis probability = 6.253398e-01
Photon flux (15-150 keV) in 1 sec: 2.82842 ( -0.26123 0.26204 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31766e-07 ( -1.4787e-08 1.6604e-08 ) ergs/cm2
Band function
Time interval is from -22.328 sec. to -21.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17367 ( )
beta : -8.31700 ( )
Epeak [keV] : 61.0169 ( )
Norm@50keV : 3.81663E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 110.52 using 59 PHA bins.
# Reduced chi-squared = 2.0095 for 55 degrees of freedom
# Null hypothesis probability = 1.338423e-05
Photon flux (15-150 keV) in 1 sec: 2.82761 ( 4.17239 -0.26705 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38337e-07 ( -1.3833e-07 -1.5554e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.11904 (-0.650387 0.714868)
R^2/D10^2 : 5.11560 (-1.7293 2.63038)
(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 4.237e-08 5.660e-09
25- 50 5.994e-08 7.175e-09
50-150 1.055e-08 3.324e-09
15-150 1.129e-07 1.171e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 30.0395 (-5.28343 6.82513)
Norm : 23.4633 (-4.1795 5.2379)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.779e-08 5.635e-09
25- 50 5.464e-08 5.720e-09
50-150 2.998e-08 8.575e-09
15-150 1.324e-07 1.520e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.15079 (-1.17049 1.10804)
R1^2/D10^2 : 15.3766 (-7.80631 23.9471)
kT2 [keV] : 14.0607 (-4.10319 9.90053)
R2^2/D10^2 : 0.150525 (-0.135996 0.686962)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.834e-08 2.092e-08
25- 50 5.300e-08 2.280e-08
50-150 3.201e-08 1.770e-08
15-150 1.334e-07 5.679e-08
Plot creation:
Sat Aug 26 12:40:29 EDT 2023