batgrbproduct analysis for trigger=1142847
batgrbproduct Analysis for Trigger=1142847
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): Fri Dec 2 18:57:15 EST 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1142847/GCN5_download_cron
======================================================================
Trigger: 01142847 Segment: 000
BAT Trigger Time: 691590336 [s; MET]
Trigger Stop: 691590400 [s; MET]
UTC: 2022-12-01T12:25:05.684420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.933488910624 Dec: -68.2595112495696 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.65
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 15.65
Flight Position: [ source = BAT ]
RA: 266.933488910624 Dec: -68.2595112495696 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.897487526124 Dec: -68.2266427361343 [deg; J2000]
{ 17h 47m 35.4s , -68d 13' 35.9" }
+/- 1.01746072285409 [arcmin] (estimated 90% radius based on SNR)
+/- 0.329410766299216 [arcmin] (formal 1-sigma fit error)
SNR: 29.6741901681322
Angular difference between Flight and Ground position is 2.128451 arcmin
Partial Coding Fraction: 0.515625 [ including projection effects ]
Duration
T90: 584.347999930382 +/- 34.6759008309404
Measured from: -17.4799998998642
to: 566.868000030518 [s; relative to TRIGTIME]
T50: 345.923999905586 +/- 28.7665107970612
Measured from: -10.9719998836517
to: 334.952000021935 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -13.5080000162125
to: -12.5080000162125 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.8839999437332
to: 648.271999955177 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.183777 4.068340 3.785091 -0.244821
0.260909 0.262948 0.224133 0.224310 [error]
Peak 0.242400 0.448210 0.519874 0.166312
0.018490 0.023012 0.023526 0.016869 [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 1.05e-06 1.91e-06 2.69e-06 7.91e-06 7.70e-06 1.36e-05 erg/cm2
Error 1.24e-07 1.36e-07 2.28e-07 1.47e-06 5.53e-07 1.63e-06 erg/cm2
Peak flux Power-law 2.50e+00 3.36e+00 3.33e+00 5.95e+00 1.11e+01 1.51e+01 ph/cm2/s
Error 2.56e-01 2.12e-01 1.83e-01 6.92e-01 5.82e-01 8.40e-01 ph/cm2/s
Fluence Cutoff-PL 9.28e-07 2.01e-06 2.79e-06 3.63e-06 7.37e-06 9.35e-06 erg/cm2
Error 1.57e-07 1.60e-07 2.55e-07 -------- 6.16e-07 2.44e-06 erg/cm2
Peak flux Cutoff-PL 2.27e+00 3.44e+00 3.50e+00 4.18e+00 1.10e+01 1.34e+01 ph/cm2/s
Error 3.22e-01 2.31e-01 2.40e-01 1.12e+00 5.92e-01 1.49e+00 ph/cm2/s
Fluence Band 9.32e-07 1.99e-06 2.78e-06 4.10e-06 7.43e-06 9.85e-06 erg/cm2
Error -------- -------- 2.51e-07 -------- -------- -------- erg/cm2
Peak flux Band 9.15e-01 1.07e+00 6.98e-01 3.23e-01 2.89e+00 3.00e+00 ph/cm2/s
Error -------- -------- 1.12e-01 -------- 3.63e-01 4.45e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.510 0.118 - - 1.22e-03 8.08e-05 60.440 57
CPL 0.910 0.532 94.2 102.3 2.38e-03 1.50e-03 56.150 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.013 0.086 - - 9.66e-02 4.95e-03 57.520 57
CPL 0.643 0.356 213.0 432.5 1.41e-01 5.15e-02 54.130 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: 622.912000 sec.
T50 in the 50-300 keV band: 452.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 669.156 -20.884 648.272
T90 584.348 -17.480 566.868
T50 345.924 -10.972 334.952
Peak 1.000 -13.508 -12.508
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.8975 -68.2266 0.0065 34.2 -38.6 9.9755 29.7 TRIG_01142847
------------------------------------------
Foreground time interval of the image:
-13.599 70.801 (delta_t = 84.400 [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
Multiple GTIs in the spectrum
tstart tstop
-20.884000 401.920000
403.000000 519.170000
520.000000 648.272000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50983 ( -0.117966 0.118271 )
Norm@50keV : 1.21813E-03 ( -8.09082e-05 8.06597e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.44 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 57 degrees of freedom
# Null hypothesis probability = 3.527850e-01
Photon flux (15-150 keV) in 667.2 sec: 0.152476 ( -0.0104511 0.0104801 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.69782e-06 ( -5.51391e-07 5.54567e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-20.884000 401.920000
403.000000 519.170000
520.000000 648.272000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.910434 ( -0.565648 0.498521 )
Epeak [keV] : 94.1929 ( -23.2408 181.404 )
Norm@50keV : 2.37610E-03 ( -0.0009936 0.00199761 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 56 degrees of freedom
# Null hypothesis probability = 4.693269e-01
Photon flux (15-150 keV) in 667.2 sec: 0.147117 ( -0.011386 0.011347 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.37029e-06 ( -6.15092e-07 6.1776e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-20.884000 401.920000
403.000000 519.170000
520.000000 648.272000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.911413 ( -0.41722 0.564443 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 94.2276 ( -17.7675 182.377 )
Norm@50keV : 2.37370E-03 ( -0.000992219 0.00200104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.316433e-01
Photon flux (15-150 keV) in 667.2 sec: 0.147949 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.43421e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.8874 (-1.19533 1.32241)
R^2/D10^2 : 1.40039E-02 (-0.00346819 0.00451176)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.56 using 59 PHA bins.
# Reduced chi-squared = 1.536 for 57 degrees of freedom
# Null hypothesis probability = 5.729417e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.884e-07 5.871e-08
25- 50 2.043e-06 1.861e-07
50-150 3.594e-06 4.273e-07
15-150 6.125e-06 4.694e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-44.8267 -200)
Norm : 0.622877 (-0.0407057 0.0407057)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.037e-06 8.407e-08
25- 50 1.996e-06 1.871e-07
50-150 4.377e-06 1.151e-06
15-150 7.410e-06 1.116e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.09872 (-1.1074 1.58086)
R1^2/D10^2 : 1.04613 (-0.793529 4.30349)
kT2 [keV] : 19.1066 (-1.97552 2.65761)
R2^2/D10^2 : 6.71268E-03 (-0.00261735 0.00336537)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.034e-06 4.298e-07
25- 50 1.825e-06 2.936e-07
50-150 4.163e-06 6.382e-07
15-150 7.022e-06 9.988e-07
Peak spectrum fit
Power-law model
Time interval is from -13.508 sec. to -12.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01264 ( -0.0860706 0.0851701 )
Norm@50keV : 9.66174E-02 ( -0.00495703 0.00495063 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.52 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.556726e-01
Photon flux (15-150 keV) in 1 sec: 11.1315 ( -0.581958 0.581872 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04008e-06 ( -5.7198e-08 5.74239e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.508 sec. to -12.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.643271 ( -0.372073 0.339662 )
Epeak [keV] : 213.024 ( -78.6 786.321 )
Norm@50keV : 0.141295 ( -0.0397117 0.0632256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9666 for 56 degrees of freedom
# Null hypothesis probability = 5.460507e-01
Photon flux (15-150 keV) in 1 sec: 11.0133 ( -0.5921 0.5922 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02844e-06 ( -5.9632e-08 5.93e-08 ) ergs/cm2
Band function
Time interval is from -13.508 sec. to -12.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.249342 ( -0.740005 1.69392 )
beta : -1.20734 ( 1.20501 0.184579 )
Epeak [keV] : 108.232 ( -60.7938 216.639 )
Norm@50keV : 0.236757 ( -0.123357 10.1488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.02 using 59 PHA bins.
# Reduced chi-squared = 0.9639 for 55 degrees of freedom
# Null hypothesis probability = 5.507719e-01
Photon flux (15-150 keV) in 1 sec: 2.88736 ( 4.11264 -0.36471 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0374e-07 ( -2.03733e-07 -2.991e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.7595 (-1.44616 1.59116)
R^2/D10^2 : 0.419436 (-0.0840517 0.102635)
(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 3.694e-08 3.635e-09
25- 50 1.940e-07 1.465e-08
50-150 6.862e-07 5.850e-08
15-150 9.172e-07 5.975e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 45.0487 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.122e-07 6.950e-09
25- 50 2.158e-07 1.355e-08
50-150 4.733e-07 8.850e-08
15-150 8.012e-07 8.570e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.8604 (-2.90469 3.30689)
R1^2/D10^2 : 2.14105 (-0.969136 2.63759)
kT2 [keV] : 41.1925 (-10.8722 52.2583)
R2^2/D10^2 : 4.51720E-02 (-0.0396721 0.0789358)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.231e-08 1.464e-08
25- 50 2.130e-07 4.365e-08
50-150 7.563e-07 2.990e-07
15-150 1.032e-06 3.402e-07
Plot creation:
Fri Dec 2 19:03:05 EST 2022