batgrbproduct analysis for trigger=1187203
batgrbproduct Analysis for Trigger=1187203
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 16:07:18 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1187203/GCN5_download_cron
======================================================================
Trigger: 01187203 Segment: 000
BAT Trigger Time: 714687664 [s; MET]
Trigger Stop: 714687728 [s; MET]
UTC: 2023-08-25T20:20:32.108640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.928347705924 Dec: -16.2056204636928 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.92
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 18.92
Flight Position: [ source = BAT ]
RA: 261.928347705924 Dec: -16.2056204636928 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 261.892397814828 Dec: -16.1515165868521 [deg; J2000]
{ 17h 27m 34.2s , -16d 09' 05.5" }
+/- 4.61601092138474 [arcmin] (estimated 90% radius based on SNR)
+/- 2.48976083102336 [arcmin] (formal 1-sigma fit error)
SNR: 3.42110000045617
Angular difference between Flight and Ground position is 3.850901 arcmin
Partial Coding Fraction: 0.1855469 [ including projection effects ]
Duration
T90: 186 +/- 50.3587132480567
Measured from: 50.0000001192093
to: 236.000000119209 [s; relative to TRIGTIME]
T50: 65 +/- 16.1245154965971
Measured from: 124.000000119209
to: 189.000000119209 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 238
to: 239 [s; relative to TRIGTIME]
Total Fluence
Measured from: 33
to: 239 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 22.647643 18.976015 5.105711 0.543043
0.197092 0.189899 0.145874 0.116218 [error]
Peak 0.178739 0.138800 0.032801 0.008424
0.011069 0.010427 0.007458 0.005619 [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 1.15e-05 8.73e-06 4.45e-06 3.26e-06 2.62e-05 2.79e-05 erg/cm2
Error 4.44e-07 1.91e-07 1.59e-07 2.41e-07 5.95e-07 6.01e-07 erg/cm2
Peak flux Power-law 2.49e+00 1.14e+00 3.14e-01 1.08e-01 4.01e+00 4.06e+00 ph/cm2/s
Error 2.96e-01 1.06e-01 6.05e-02 3.77e-02 3.60e-01 3.60e-01 ph/cm2/s
Fluence Cutoff-PL 9.34e-06 9.29e-06 4.24e-06 8.78e-07 2.36e-05 2.38e-05 erg/cm2
Error 5.82e-07 2.26e-07 1.90e-07 2.27e-07 7.58e-07 8.16e-07 erg/cm2
Peak flux Cutoff-PL 2.43e+00 1.18e+00 2.99e-01 5.87e-02 3.96e+00 3.97e+00 ph/cm2/s
Error 3.25e-01 1.40e-01 7.52e-02 7.13e-02 3.77e-01 3.90e-01 ph/cm2/s
Fluence Band 6.13e-06 6.90e-06 2.72e-06 9.60e-07 1.64e-05 1.68e-05 erg/cm2
Error 8.56e-07 8.34e-07 -------- 1.71e-06 -------- 2.86e-06 erg/cm2
Peak flux Band 1.25e+00 9.57e-01 2.98e-01 3.40e-02 2.54e+00 2.54e+00 ph/cm2/s
Error -------- 2.31e-01 -------- -------- 5.25e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.973 0.048 - - 1.08e-02 2.76e-04 113.800 57
CPL 1.807 0.241 7.2 0.0 4.53e-02 0.00e+00 41.040 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.860 0.201 - - 1.61e-02 2.36e-03 59.540 57
CPL 1.000 0.000 50.0 0.0 6.27e-02 0.00e+00 132.990 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 206.000 33.000 239.000
T90 186.000 50.000 236.000
T50 65.000 124.000 189.000
Peak 1.000 238.000 239.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
261.8924 -16.1515 0.0559 49.2 169.4 0.8215 3.4 TRIG_01187203
------------------------------------------
Foreground time interval of the image:
33.000 69.901 (delta_t = 36.901 [sec])
Background time interval of the image:
-60.000 -52.778 (delta_t = 7.222 [sec])
-52.000 3.170 (delta_t = 55.170 [sec])
4.000 15.785 (delta_t = 11.785 [sec])
17.000 33.000 (delta_t = 16.000 [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
33.000000 92.350000
94.000000 239.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97275 ( -0.0474073 0.0478754 )
Norm@50keV : 1.07824E-02 ( -0.000276382 0.000275352 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 113.80 using 59 PHA bins.
# Reduced chi-squared = 1.9965 for 57 degrees of freedom
# Null hypothesis probability = 1.175608e-05
Photon flux (15-150 keV) in 204.4 sec: 2.90724 ( -0.0857183 0.0866083 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61538e-05 ( -5.93825e-07 5.95321e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
33.000000 92.350000
94.000000 239.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80670 ( -0.287417 0.194663 )
Epeak [keV] : 7.24366 ( )
Norm@50keV : 4.52847E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.04 using 59 PHA bins.
# Reduced chi-squared = 0.7328 for 56 degrees of freedom
# Null hypothesis probability = 9.330815e-01
Photon flux (15-150 keV) in 204.4 sec: 2.55806 ( -0.10445 0.1064 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35775e-05 ( -7.5444e-07 7.61799e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
33.000000 92.350000
94.000000 239.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.57586 ( -0.207148 0.557554 )
beta : -3.75103 ( -0.91836 0.32566 )
Epeak [keV] : 12.8444 ( -8.12952 7.44231 )
Norm@50keV : 6.21027E-02 ( -0.0213842 0.0728831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.72 using 59 PHA bins.
# Reduced chi-squared = 0.6857 for 55 degrees of freedom
# Null hypothesis probability = 9.637526e-01
Photon flux (15-150 keV) in 204.4 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63719e-05 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.49013 ( )
R^2/D10^2 : 1.84981 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 292.76 using 59 PHA bins.
# Reduced chi-squared = 5.1361 for 57 degrees of freedom
# Null hypothesis probability = 2.040123e-33
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.133e-06 2.146e-07
25- 50 9.934e-06 2.310e-07
50-150 3.160e-06 1.625e-07
15-150 1.823e-05 4.303e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.9033 (-1.10387 1.16452)
Norm : 21.4765 (-1.21228 1.28814)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.593e-06 3.168e-07
25- 50 9.422e-06 2.330e-07
50-150 4.682e-06 2.340e-07
15-150 2.270e-05 5.212e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.30092 (-0.554917 0.553252)
R1^2/D10^2 : 11.1119 (-3.61294 6.65204)
kT2 [keV] : 13.0555 (-1.17441 1.57182)
R2^2/D10^2 : 0.162244 (-0.0756964 0.113935)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.138e-06 6.807e-07
25- 50 9.368e-06 5.161e-07
50-150 4.760e-06 5.366e-07
15-150 2.227e-05 1.355e-06
Peak spectrum fit
Power-law model
Time interval is from 238.000 sec. to 239.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.86025 ( -0.193564 0.209395 )
Norm@50keV : 1.61145E-02 ( -0.00237174 0.00234217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.54 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.831904e-01
Photon flux (15-150 keV) in 1 sec: 4.01114 ( -0.360066 0.360896 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82191e-07 ( -1.70517e-08 1.7202e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 238.000 sec. to 239.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 6.26882E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 132.99 using 59 PHA bins.
# Reduced chi-squared = 2.3748 for 56 degrees of freedom
# Null hypothesis probability = 3.306692e-08
Photon flux (15-150 keV) in 1 sec: 3.95560 ( -0.37786 0.3769 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77072e-07 ( -1.9672e-08 2.0019e-08 ) ergs/cm2
Band function
Time interval is from 238.000 sec. to 239.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.89436 ( 0.84445 0.84445 )
beta : -3.16695 ( 3.15966 0.428924 )
Epeak [keV] : 3.49477 ( -3.50368 6.37453 )
Norm@50keV : 7.04980E-02 ( -0.0224645 26001 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.18 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Null hypothesis probability = 3.591299e-01
Photon flux (15-150 keV) in 1 sec: 2.53604 ( 4.46396 -0.52406 ) 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] : 6.55127 (-0.63553 0.689567)
R^2/D10^2 : 9.36898 (-3.40179 5.55299)
(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 5.999e-08 9.065e-09
25- 50 7.200e-08 8.405e-09
50-150 9.331e-09 3.331e-09
15-150 1.413e-07 1.530e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.0302 (-4.26754 5.35926)
Norm : 38.4546 (-8.0556 10.8324)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.860e-08 7.990e-09
25- 50 6.852e-08 6.670e-09
50-150 2.747e-08 8.025e-09
15-150 1.646e-07 1.570e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.05566 (-1.77211 1.00128)
R1^2/D10^2 : 25.8031 (-13.6198 129.588)
kT2 [keV] : 16.9651 (-7.79918 13.4862)
R2^2/D10^2 : 7.32667E-02 (-0.0653273 0.248317)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.988e-08 2.160e-08
25- 50 6.299e-08 1.639e-08
50-150 4.087e-08 2.392e-08
15-150 1.737e-07 5.257e-08
Plot creation:
Sat Aug 26 16:11:01 EDT 2023