batgrbproduct analysis for trigger=1149250
batgrbproduct Analysis for Trigger=1149250
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 Jan 17 18:15:31 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1149250/GCN5_download_cron
======================================================================
Trigger: 01149250 Segment: 000
BAT Trigger Time: 695576032 [s; MET]
Trigger Stop: 695576096 [s; MET]
UTC: 2023-01-16T15:33:21.412960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 223.46306794312 Dec: -16.8714844051089 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.88
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.88
Flight Position: [ source = BAT ]
RA: 223.46306794312 Dec: -16.8714844051089 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 223.466618735097 Dec: -16.8826428399351 [deg; J2000]
{ 14h 53m 52.0s , -16d 52' 57.5" }
+/- 1.40355198380436 [arcmin] (estimated 90% radius based on SNR)
+/- 0.770072663344935 [arcmin] (formal 1-sigma fit error)
SNR: 18.7409649324162
Angular difference between Flight and Ground position is 0.699859 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 316.768000006676 +/- 52.4997602612132
Measured from: -20.1679998636246
to: 296.600000143051 [s; relative to TRIGTIME]
T50: 124.463999986649 +/- 61.9519938198983
Measured from: 21.1120001077652
to: 145.576000094414 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 247.707999944687
to: 248.707999944687 [s; relative to TRIGTIME]
Total Fluence
Measured from: -35.8639999628067
to: 346.679999947548 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.020100 3.927919 2.506155 0.585310
0.252981 0.251787 0.217999 0.190106 [error]
Peak 0.045732 0.037010 0.037017 0.004747
0.014187 0.014586 0.012197 0.010893 [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 1.04e-06 1.67e-06 2.03e-06 4.82e-06 6.12e-06 9.56e-06 erg/cm2
Error 1.27e-07 1.26e-07 2.21e-07 1.11e-06 5.15e-07 1.30e-06 erg/cm2
Peak flux Power-law 3.90e-01 2.76e-01 1.29e-01 8.40e-02 8.35e-01 8.79e-01 ph/cm2/s
Error 2.01e-01 1.15e-01 8.29e-02 1.06e-01 3.44e-01 3.65e-01 ph/cm2/s
Fluence Cutoff-PL 1.01e-06 1.70e-06 2.04e-06 3.52e-06 6.01e-06 8.28e-06 erg/cm2
Error 1.11e-07 1.54e-07 2.29e-07 2.28e-06 5.82e-07 2.26e-06 erg/cm2
Peak flux Cutoff-PL 2.96e-01 3.53e-01 1.60e-01 2.19e-02 8.27e-01 8.29e-01 ph/cm2/s
Error 2.40e-01 1.54e-01 1.15e-01 -------- 3.44e-01 3.48e-01 ph/cm2/s
Fluence Band 9.94e-07 1.71e-06 2.01e-06 4.33e-06 6.03e-06 9.05e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.17e-01 3.37e-01 1.64e-01 -------- 8.47e-01 8.56e-01 ph/cm2/s
Error -------- -------- 1.07e-01 -------- 3.51e-01 3.49e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.720 0.137 - - 1.73e-03 1.39e-04 45.200 57
CPL 1.530 0.438 117.4 -14.0 2.18e-03 1.40e-03 44.800 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.100 0.721 - - 5.31e-03 2.77e-03 52.400 57
CPL 0.110 3.498 46.0 0.0 6.05e-02 0.00e+00 50.600 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: 398.592000 sec.
T50 in the 50-300 keV band: 192.320000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 382.544 -35.864 346.680
T90 316.768 -20.168 296.600
T50 124.464 21.112 145.576
Peak 1.000 247.708 248.708
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
223.4666 -16.8826 0.0102 30.5 32.1 4.8756 18.7 TRIG_01149250
------------------------------------------
Foreground time interval of the image:
-35.864 69.301 (delta_t = 105.165 [sec])
Background time interval of the image:
-239.000 -35.864 (delta_t = 203.136 [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
Time interval is from -35.864 sec. to 346.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72049 ( -0.136224 0.138764 )
Norm@50keV : 1.72957E-03 ( -0.000139265 0.00013785 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.20 using 59 PHA bins.
# Reduced chi-squared = 0.7930 for 57 degrees of freedom
# Null hypothesis probability = 8.704464e-01
Photon flux (15-150 keV) in 382.5 sec: 0.231375 ( -0.01753 0.0175576 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.11595e-06 ( -5.1291e-07 5.17675e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -35.864 sec. to 346.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52980 ( -0.563887 0.312274 )
Epeak [keV] : 117.409 ( -89.4218 -117.412 )
Norm@50keV : 2.17767E-03 ( -0.000741478 0.002062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.80 using 59 PHA bins.
# Reduced chi-squared = 0.8000 for 56 degrees of freedom
# Null hypothesis probability = 8.586911e-01
Photon flux (15-150 keV) in 382.5 sec: 0.229060 ( -0.018565 0.018147 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.01481e-06 ( -5.8446e-07 5.80061e-07 ) ergs/cm2
Band function
Time interval is from -35.864 sec. to 346.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33554 ( 1.25347 6.10888 )
beta : -1.82679 ( 1.82366 0.228869 )
Epeak [keV] : 68.1822 ( -62.3303 -62.3303 )
Norm@50keV : 2.89713E-03 ( -0.00115638 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.77 using 59 PHA bins.
# Reduced chi-squared = 0.8140 for 55 degrees of freedom
# Null hypothesis probability = 8.361368e-01
Photon flux (15-150 keV) in 382.5 sec: 0.228849 ( 6.77115 -0.018635 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.02621e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.7150 (-1.19578 1.34424)
R^2/D10^2 : 4.42602E-02 (-0.0136802 0.0194491)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.02 using 59 PHA bins.
# Reduced chi-squared = 1.562 for 57 degrees of freedom
# Null hypothesis probability = 4.256144e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.805e-07 8.740e-08
25- 50 1.951e-06 1.869e-07
50-150 1.968e-06 3.259e-07
15-150 4.500e-06 4.093e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 133.811 (-39.2337 60.5722)
Norm : 0.953026 (-0.085398 0.112291)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.442e-07 1.033e-07
25- 50 1.720e-06 2.291e-07
50-150 3.231e-06 1.253e-06
15-150 5.895e-06 1.542e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.63804 (-1.70148 1.76016)
R1^2/D10^2 : 0.323570 (-0.175131 0.396494)
kT2 [keV] : 24.3122 (-5.72171 11.4398)
R2^2/D10^2 : 3.18850E-03 (-0.00236988 0.00498877)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.534e-07 2.995e-07
25- 50 1.729e-06 4.416e-07
50-150 3.264e-06 1.632e-06
15-150 5.947e-06 1.904e-06
Peak spectrum fit
Power-law model
Time interval is from 247.708 sec. to 248.708 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10004 ( -0.605346 0.837365 )
Norm@50keV : 5.31006E-03 ( -0.00284984 0.00269573 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.40 using 59 PHA bins.
# Reduced chi-squared = 0.9193 for 57 degrees of freedom
# Null hypothesis probability = 6.480142e-01
Photon flux (15-150 keV) in 1 sec: 0.835437 ( -0.344309 0.344329 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.93025e-08 ( -2.29961e-08 2.43316e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 247.708 sec. to 248.708 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.110134 ( -4.99715 1.99857 )
Epeak [keV] : 45.9607 ( )
Norm@50keV : 6.04559E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.60 using 59 PHA bins.
# Reduced chi-squared = 0.9035 for 56 degrees of freedom
# Null hypothesis probability = 6.788176e-01
Photon flux (15-150 keV) in 1 sec: 0.826721 ( -0.344318 0.343789 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.97235e-08 ( -2.15905e-08 2.3437e-08 ) ergs/cm2
Band function
Time interval is from 247.708 sec. to 248.708 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.176943 ( -1.05597 0.944008 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 45.8031 ( -27.9209 262.719 )
Norm@50keV : 5.61780E-02 ( -0.0561407 14.2865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.60 using 59 PHA bins.
# Reduced chi-squared = 0.9200 for 55 degrees of freedom
# Null hypothesis probability = 6.432953e-01
Photon flux (15-150 keV) in 1 sec: 0.847013 ( 6.15299 -0.371975 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.99714e-08 ( -4.99644e-08 -2.18214e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.3211 (-4.57834 5.53506)
R^2/D10^2 : 0.202565 (-0.202565 0.876122)
(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 6.516e-09 4.321e-09
25- 50 2.114e-08 1.365e-08
50-150 1.964e-08 1.614e-08
15-150 4.730e-08 3.134e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 62.1581 (-36.7396 -61.5016)
Norm : 4.52208 (-2.11662 3.75712)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.143e-08 7.535e-09
25- 50 1.758e-08 1.136e-08
50-150 2.059e-08 1.808e-08
15-150 4.960e-08 3.421e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.01314 (-3.72237 38.9272)
R1^2/D10^2 : 6.87090 (-8.69762 47.1732)
kT2 [keV] : 14.6249 (-14.3715 -14.3715)
R2^2/D10^2 : 9.10355E-02 (-0.0979646 0.552887)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.044e-08 6.920e-09
25- 50 1.819e-08 1.102e-08
50-150 2.288e-08 1.752e-08
15-150 5.151e-08 3.017e-08
Plot creation:
Tue Jan 17 18:19:30 EST 2023