batgrbproduct analysis for trigger=1031728
batgrbproduct Analysis for Trigger=1031728
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): Wed Feb 10 20:48:38 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1031728/GCN5_download_cron
======================================================================
Trigger: 01031728 Segment: 000
BAT Trigger Time: 634615254.4 [s; MET]
Trigger Stop: 634615254.528 [s; MET]
UTC: 2021-02-10T02:00:27.919820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 262.810959176437 Dec: 14.6481728923598 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.51
Image Trigger?: NO
Rate S/N Ratio: 16.2480768092719 [ if not an image trigger ]
Image S/N Ratio: 7.51
Flight Position: [ source = BAT ]
RA: 262.810959176437 Dec: 14.6481728923598 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 262.764374316694 Dec: 14.6574439916364 [deg; J2000]
{ 17h 31m 03.4s , +14d 39' 26.8" }
+/- 1.04135521777744 [arcmin] (estimated 90% radius based on SNR)
+/- 0.328423280630873 [arcmin] (formal 1-sigma fit error)
SNR: 28.7062919844655
Angular difference between Flight and Ground position is 2.760806 arcmin
Partial Coding Fraction: 0.4335938 [ including projection effects ]
Duration
T90: 6.60399997234344 +/- 0.589318239671799
Measured from: -0.407999873161316
to: 6.19600009918213 [s; relative to TRIGTIME]
T50: 4.34799993038177 +/- 0.216333035530084
Measured from: 0.476000189781189
to: 4.82400012016296 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.21200001239777
to: 5.21200001239777 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.751999974250793
to: 6.92799997329712 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.936423 0.809900 0.275352 0.017264
0.039694 0.037195 0.030136 0.027121 [error]
Peak 0.287085 0.298769 0.126897 0.010226
0.017438 0.017452 0.012909 0.009979 [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 3.39e-07 3.49e-07 2.53e-07 2.94e-07 1.06e-06 1.24e-06 erg/cm2
Error 2.80e-08 2.04e-08 2.83e-08 6.38e-08 6.63e-08 9.94e-08 erg/cm2
Peak flux Power-law 3.41e+00 2.28e+00 9.95e-01 5.99e-01 6.98e+00 7.28e+00 ph/cm2/s
Error 3.45e-01 1.56e-01 1.10e-01 1.24e-01 4.94e-01 5.02e-01 ph/cm2/s
Fluence Cutoff-PL 3.11e-07 3.80e-07 2.31e-07 7.11e-08 9.75e-07 9.93e-07 erg/cm2
Error 3.26e-08 2.70e-08 3.49e-08 5.87e-08 7.51e-08 9.76e-08 erg/cm2
Peak flux Cutoff-PL 3.11e+00 2.48e+00 9.99e-01 2.41e-01 6.77e+00 6.83e+00 ph/cm2/s
Error 4.04e-01 2.13e-01 1.25e-01 1.67e-01 5.16e-01 5.45e-01 ph/cm2/s
Fluence Band 3.09e-07 3.78e-07 2.32e-07 -------- 9.77e-07 9.97e-07 erg/cm2
Error 3.22e-08 -------- -------- -------- -------- -------- 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 2.464 0.121 - - 1.39e-02 1.12e-03 53.940 57
CPL 1.530 0.579 19.9 13.9 4.90e-02 4.33e-02 44.330 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.196 0.127 - - 4.23e-02 3.55e-03 47.520 57
CPL 1.406 0.611 32.3 17.8 1.18e-01 1.10e-01 41.550 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: 4.672000 sec.
T50 in the 50-300 keV band: 4.160000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.680 -0.752 6.928
T90 6.604 -0.408 6.196
T50 4.348 0.476 4.824
Peak 1.000 4.212 5.212
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
262.7644 +14.6574 0.0067 35.5 153.9 2.1911 28.7 TRIG_01031728
------------------------------------------
Foreground time interval of the image:
-0.752 6.928 (delta_t = 7.680 [sec])
Background time interval of the image:
-239.400 -0.752 (delta_t = 238.648 [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 -0.752 sec. to 6.928 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.46424 ( -0.119 0.123534 )
Norm@50keV : 1.38772E-02 ( -0.00112187 0.00111018 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.94 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.91e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 7.68 sec: 2.66752 ( -0.15874 0.159139 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05582e-06 ( -6.59981e-08 6.65354e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.752 sec. to 6.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53044 ( -0.613009 0.545628 )
Epeak [keV] : 19.8915 ( -19.1819 8.71804 )
Norm@50keV : 4.90463E-02 ( -0.0233808 0.0632342 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.33 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.70e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 7.68 sec: 2.54295 ( -0.17196 0.17241 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.7516e-07 ( -7.33824e-08 7.6823e-08 ) ergs/cm2
Band function
Time interval is from -0.752 sec. to 6.928 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.53069 ( -0.465907 0.296129 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 19.8812 ( -5.71487 8.70527 )
Norm@50keV : 4.90233E-02 ( -0.0233578 0.063241 )
------------------------------------------------------------
Photon flux (15-150 keV) in 7.68 sec: 2.54561 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.76812e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.59417 (-0.556356 0.585146)
R^2/D10^2 : 2.03287 (-0.489001 0.657754)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 89.26 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.05e-03 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.188e-07 2.216e-08
25- 50 4.320e-07 2.930e-08
50-150 1.428e-07 2.638e-08
15-150 7.937e-07 5.468e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.8642 (-4.75343 5.71591)
Norm : 17.7509 (-2.10965 2.44749)
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.69 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.82e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.040e-07 2.342e-08
25- 50 3.856e-07 2.431e-08
50-150 2.722e-07 4.631e-08
15-150 9.618e-07 6.374e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.94890 (-0.698489 0.837585)
R1^2/D10^2 : 34.7947 (-19.8465 55.0312)
kT2 [keV] : 11.9578 (-1.37031 1.8898)
R2^2/D10^2 : 0.403422 (-0.203518 0.311624)
------------------------------------------------------------
#Fit statistic : Chi-Squared 41.19 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.16e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.220e-07 1.240e-07
25- 50 3.730e-07 8.901e-08
50-150 2.527e-07 6.685e-08
15-150 9.477e-07 2.341e-07
Peak spectrum fit
Power-law model
Time interval is from 4.212 sec. to 5.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19615 ( -0.124158 0.128967 )
Norm@50keV : 4.22578E-02 ( -0.00357315 0.00352125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.52 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.10e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 6.98181 ( -0.49393 0.494703 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.97098e-07 ( -2.97523e-08 2.99289e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.212 sec. to 5.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40632 ( -0.657148 0.565249 )
Epeak [keV] : 32.2694 ( -27.439 8.23556 )
Norm@50keV : 0.118069 ( -0.0606354 0.159676 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 41.55 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.25e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 6.77115 ( -0.51598 0.51604 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75873e-07 ( -3.2612e-08 3.3226e-08 ) ergs/cm2
Band function
Time interval is from 4.212 sec. to 5.212 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27838 ( -0.577531 1.30758 )
beta : -2.83199 ( 2.83872 0.530337 )
Epeak [keV] : 32.6324 ( -16.0758 7.16759 )
Norm@50keV : 0.142121 ( -0.0459844 1.03541 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77602e-07 ( -3.77595e-07 -3.2349e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.83348 (-0.718282 0.7675)
R^2/D10^2 : 3.38163 (-0.884832 1.20072)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 76.30 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.49e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.620e-08 7.485e-09
25- 50 1.607e-07 1.295e-08
50-150 7.988e-08 1.431e-08
15-150 3.068e-07 2.430e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.3709 (-8.40097 11.1184)
Norm : 38.4262 (-4.35299 5.25101)
------------------------------------------------------------
#Fit statistic : Chi-Squared 41.58 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.38e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.492e-08 9.135e-09
25- 50 1.386e-07 1.060e-08
50-150 1.404e-07 2.275e-08
15-150 3.739e-07 3.020e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.79301 (-1.36854 1.88121)
R1^2/D10^2 : 34.9815 (-23.8353 114.815)
kT2 [keV] : 14.3197 (-2.42936 5.44206)
R2^2/D10^2 : 0.566421 (-0.44124 0.778638)
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.31 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.48e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.609e-08 4.079e-08
25- 50 1.351e-07 3.790e-08
50-150 1.285e-07 4.331e-08
15-150 3.597e-07 9.055e-08
Plot creation:
Wed Feb 10 20:52:55 EST 2021