batgrbproduct analysis for trigger=1031297
batgrbproduct Analysis for Trigger=1031297
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): Mon Feb 8 20:28:37 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1031297/GCN5_download_cron
======================================================================
Trigger: 01031297 Segment: 000
BAT Trigger Time: 634427554.624 [s; MET]
Trigger Stop: 634427555.136 [s; MET]
UTC: 2021-02-07T21:52:08.156240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 270.582286117508 Dec: 53.6941953675612 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.59
Image Trigger?: NO
Rate S/N Ratio: 17.7482393492988 [ if not an image trigger ]
Image S/N Ratio: 9.59
Flight Position: [ source = BAT ]
RA: 270.582286117508 Dec: 53.6941953675612 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 270.613645394012 Dec: 53.700303095851 [deg; J2000]
{ 18h 02m 27.3s , +53d 42' 01.1" }
+/- 1.42988979197925 [arcmin] (estimated 90% radius based on SNR)
+/- 0.536985441108581 [arcmin] (formal 1-sigma fit error)
SNR: 18.2497774101764
Angular difference between Flight and Ground position is 1.172708 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 95.691999912262 +/- 4.51693707910054
Measured from: 1.63600015640259
to: 97.3280000686646 [s; relative to TRIGTIME]
T50: 34.4919999837875 +/- 6.66298912205181
Measured from: 18.256000161171
to: 52.7480001449585 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 43.1560000181198
to: 44.1560000181198 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.251999974250793
to: 106.404000043869 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.368569 2.087696 2.007926 0.737156
0.071619 0.074467 0.067098 0.059513 [error]
Peak 0.058941 0.130582 0.154943 0.068608
0.007300 0.008705 0.009159 0.008361 [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 4.12e-07 9.07e-07 1.57e-06 6.34e-06 4.30e-06 9.23e-06 erg/cm2
Error 3.32e-08 4.21e-08 6.64e-08 6.42e-07 1.69e-07 6.68e-07 erg/cm2
Peak flux Power-law 6.00e-01 8.94e-01 9.96e-01 2.10e+00 3.12e+00 4.59e+00 ph/cm2/s
Error 8.99e-02 7.98e-02 7.12e-02 3.42e-01 2.13e-01 3.67e-01 ph/cm2/s
Fluence Cutoff-PL 4.10e-07 9.09e-07 1.57e-06 6.28e-06 4.30e-06 9.00e-06 erg/cm2
Error 3.41e-08 4.19e-08 6.60e-08 8.29e-07 1.68e-07 1.04e-06 erg/cm2
Peak flux Cutoff-PL 6.00e-01 8.95e-01 9.97e-01 2.08e+00 3.12e+00 4.58e+00 ph/cm2/s
Error 8.98e-02 8.08e-02 8.09e-02 5.73e-01 2.13e-01 5.86e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- 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 1.205 0.071 - - 3.98e-03 1.49e-04 53.920 57
CPL 1.203 0.100 9999.3 0.0 4.00e-03 4.47e-04 53.970 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.844 0.124 - - 2.72e-02 1.87e-03 62.790 57
CPL 0.838 0.139 9999.4 0.0 2.74e-02 8.85e-03 62.790 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: 94.592000 sec.
T50 in the 50-300 keV band: 27.712000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 106.656 -0.252 106.404
T90 95.692 1.636 97.328
T50 34.492 18.256 52.748
Peak 1.000 43.156 44.156
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
270.6136 +53.7003 0.0105 32.9 17.1 0.9984 18.2 TRIG_01031297
------------------------------------------
Foreground time interval of the image:
-0.252 9.277 (delta_t = 9.529 [sec])
Background time interval of the image:
-172.523 -0.252 (delta_t = 172.271 [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 -0.252 sec. to 106.404 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20494 ( -0.0709771 0.0704447 )
Norm@50keV : 3.98110E-03 ( -0.000148699 0.000148418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.92 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.91e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 106.7 sec: 0.467628 ( -0.0187751 0.0188556 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30363e-06 ( -1.68825e-07 1.69266e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.252 sec. to 106.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20323 ( -0.131757 0.0687962 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 3.99804E-03 ( -0.000147637 0.000746188 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.97 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.52e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 106.7 sec: 0.467416 ( -0.018767 0.018818 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30176e-06 ( -1.66986e-07 1.69717e-07 ) ergs/cm2
Band function
Time interval is from -0.252 sec. to 106.404 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.954571 ( 0.954576 0.954576 )
beta : -1.20493 ( -0.0704417 0.0709806 )
Epeak [keV] : 48.4519 ( -48.4499 -48.4499 )
Norm@50keV : 7.37159E-03 ( -0.00277316 21.5842 )
------------------------------------------------------------
Photon flux (15-150 keV) in 106.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.3652 ( )
R^2/D10^2 : 1.96338E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 213.06 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.24e-20 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.663e-07 1.339e-08
25- 50 8.381e-07 5.244e-08
50-150 2.583e-06 1.617e-07
15-150 3.587e-06 1.601e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.99088 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 134.96 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.87e-08 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.290e-07 2.150e-08
25- 50 1.018e-06 4.156e-08
50-150 2.232e-06 9.230e-08
15-150 3.778e-06 1.547e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.02733 (-1.36434 1.50245)
R1^2/D10^2 : 0.183897 (-0.0668036 0.123842)
kT2 [keV] : 40.1526 (-7.27646 13.7977)
R2^2/D10^2 : 1.91221E-03 (-0.00105776 0.00163608)
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.80 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.46e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.541e-07 4.983e-08
25- 50 9.550e-07 9.005e-08
50-150 3.032e-06 5.111e-07
15-150 4.341e-06 6.087e-07
Peak spectrum fit
Power-law model
Time interval is from 43.156 sec. to 44.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.844438 ( -0.125416 0.122763 )
Norm@50keV : 2.72190E-02 ( -0.00187578 0.00186652 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 62.79 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.79e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 3.12476 ( -0.213129 0.213484 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1229e-07 ( -2.31183e-08 2.32511e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 43.156 sec. to 44.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.838319 ( -0.155448 0.123385 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.74087E-02 ( -0.00191146 0.0157921 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 62.79 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.48e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 3.12418 ( -0.21337 0.21294 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12208e-07 ( -2.3668e-08 2.3309e-08 ) ergs/cm2
Band function
Time interval is from 43.156 sec. to 44.156 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.839916 ( 0.840061 0.840061 )
beta : -0.844439 ( -0.122736 0.125483 )
Epeak [keV] : 17.4708 ( -17.4686 -17.4686 )
Norm@50keV : 3.77158E-02 ( -0.013717 728705 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.0748 (-2.46761 2.89402)
R^2/D10^2 : 7.70456E-02 (-0.021162 0.0279786)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 98.60 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.22e-04 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.402e-09 1.243e-09
25- 50 4.774e-08 5.060e-09
50-150 2.225e-07 2.450e-08
15-150 2.786e-07 2.665e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 12.2173 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 149.97 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.70e-10 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.042e-08 2.405e-09
25- 50 5.852e-08 8.535e-09
50-150 1.284e-07 6.060e-08
15-150 2.173e-07 4.185e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.32809 (-2.66187 3.85087)
R1^2/D10^2 : 1.11392 (-0.703522 2.81814)
kT2 [keV] : 39.1022 (-8.52167 26.1139)
R2^2/D10^2 : 1.87876E-02 (-0.0137289 0.0175934)
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.19 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.85e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.814e-08 8.346e-09
25- 50 5.246e-08 1.762e-08
50-150 2.452e-07 8.734e-08
15-150 3.158e-07 9.495e-08
Plot creation:
Mon Feb 8 20:33:36 EST 2021