batgrbproduct analysis for trigger=969823
batgrbproduct Analysis for Trigger=969823
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 v2.47
Process Start Time (local time): Thu May 7 16:48:28 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger969823/GCN5_download_cron
======================================================================
Trigger: 00969823 Segment: 000
BAT Trigger Time: 610479435.068 [s; MET]
Trigger Stop: 610479435.072 [s; MET]
UTC: 2020-05-06T17:36:50.172640 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 274.498012184807 Dec: -16.151925101102 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.41
Image Trigger?: NO
Rate S/N Ratio: 24.9799919935936 [ if not an image trigger ]
Image S/N Ratio: 7.41
Flight Position: [ source = BAT ]
RA: 274.498012184807 Dec: -16.151925101102 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.427979695533 Dec: -16.1374867987645 [deg; J2000]
{ 18h 17m 42.7s , -16d 08' 15.0" }
+/- 2.63947703281413 [arcmin] (estimated 90% radius based on SNR)
+/- 1.86721226598046 [arcmin] (formal 1-sigma fit error)
SNR: 7.60238692700425
Angular difference between Flight and Ground position is 4.128155 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 0.00400006771087646 +/- 0.035777160144337
Measured from: 0
to: 0.00400006771087646 [s; relative to TRIGTIME]
T50: 0.00400006771087646 +/- 0.016
Measured from: 0
to: 0.00400006771087646 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.00400006771087646 second)
Measured from: -5.96046447753906e-08
to: 0.00400000810623169 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.00400006771087646 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.007617 0.005083 0.001793 0.000369
0.001638 0.001249 0.000666 0.000530 [error]
Peak 0.007617 0.005083 0.001793 0.000369
0.001638 0.001249 0.000666 0.000530 [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 1.46e-09 1.26e-09 7.38e-10 6.49e-10 3.74e-09 4.11e-09 erg/cm2
Error 5.79e-10 4.26e-10 4.94e-10 1.05e-09 1.26e-09 1.71e-09 erg/cm2
Peak flux Power-law 1.21e+01 5.84e+00 1.71e+00 6.34e-01 2.00e+01 2.03e+01 ph/cm2/s
Error 4.90e+00 1.92e+00 1.10e+00 9.50e-01 6.32e+00 6.34e+00 ph/cm2/s
Fluence Cutoff-PL 1.78e-09 1.87e-09 3.68e-11 2.21e-16 3.69e-09 3.69e-09 erg/cm2
Error 6.92e-10 7.30e-10 1.40e-10 2.30e-12 1.07e-09 1.07e-09 erg/cm2
Peak flux Cutoff-PL 1.39e+01 9.33e+00 1.05e-01 3.32e-07 2.34e+01 2.34e+01 ph/cm2/s
Error 5.67e+00 3.61e+00 3.64e-01 3.24e-03 6.99e+00 6.99e+00 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 2.769 0.689 - - 8.58e-02 4.15e-02 25.570 57
CPL -6.315 0.179 25.2 4.0 3.59e+05 8.63e+07 21.280 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.769 0.689 - - 8.58e-02 4.15e-02 25.570 57
CPL -6.315 0.179 25.2 4.0 3.59e+05 8.63e+07 21.280 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 0.004 0.000 0.004
T90 0.004 0.000 0.004
T50 0.004 0.000 0.004
Peak 0.004 -0.000 0.004
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.4280 -16.1375 0.0253 12.7 71.8 0.0151 7.6 TRIG_00969823
------------------------------------------
Foreground time interval of the image:
0.000 0.004 (delta_t = 0.004 [sec])
Background time interval of the image:
-239.068 -45.418 (delta_t = 193.650 [sec])
-44.068 -3.068 (delta_t = 41.000 [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
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.76869 ( -0.698929 0.679025 )
Norm@50keV : 8.57742E-02 ( -0.0397032 0.0432043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 25.57 using 59 PHA bins.
# Reduced chi-squared = 0.4485 for 57 degrees of freedom
# Null hypothesis probability = 9.998968e-01
Photon flux (15-150 keV) in 0.004 sec: 20.0458 ( -6.31336 6.32331 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74197e-09 ( -1.23499e-09 1.29249e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.31498 ( 6.36999 6.7285 )
Epeak [keV] : 25.1593 ( -4.83844 3.20677 )
Norm@50keV : 3.59172E+05 ( -446309 1.72109e+08 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 21.28 using 59 PHA bins.
# Reduced chi-squared = 0.3799 for 56 degrees of freedom
# Null hypothesis probability = 9.999931e-01
Photon flux (15-150 keV) in 0.004 sec: 23.3794 ( -6.9893 6.9932 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68929e-09 ( -1.06548e-09 1.06615e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38550 ( 1.58157 1.58157 )
beta : -5.38079 ( 8.62136 18.2461 )
Epeak [keV] : 24.0405 ( -7.49755 4.23899 )
Norm@50keV : 1.70450E+04 ( -16862.9 22106.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 21.09 using 59 PHA bins.
# Reduced chi-squared = 0.3834 for 55 degrees of freedom
# Null hypothesis probability = 9.999902e-01
Photon flux (15-150 keV) in 0.004 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] : 5.71955 (-0.939299 1.14945)
R^2/D10^2 : 110.155 (-69.2048 148.707)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 22.64 using 59 PHA bins.
# Reduced chi-squared = 0.3971 for 57 degrees of freedom
# Null hypothesis probability = 9.999872e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.782e-09 1.041e-09
25- 50 1.598e-09 8.611e-10
50-150 1.198e-10 9.254e-11
15-150 3.500e-09 1.873e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.1505 (-6.75345 17.1532)
Norm : 270.608 (-154.215 251.203)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 24.70 using 59 PHA bins.
# Reduced chi-squared = 0.4333 for 57 degrees of freedom
# Null hypothesis probability = 9.999418e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.617e-09 7.891e-10
25- 50 1.368e-09 7.067e-10
50-150 3.806e-10 3.062e-10
15-150 3.365e-09 1.643e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.02370 (-1.10841 1.17636)
R1^2/D10^2 : 176.205 (-120.43 257.581)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 5.01060E-03 (-0.00447945 0.210138)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 19.14 using 59 PHA bins.
# Reduced chi-squared = 0.3480 for 55 degrees of freedom
# Null hypothesis probability = 9.999983e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.772e-09 1.058e-09
25- 50 1.372e-09 8.462e-10
50-150 5.355e-09 4.038e-10
15-150 8.499e-09 2.424e-09
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.76869 ( -0.698929 0.679025 )
Norm@50keV : 8.57742E-02 ( -0.0397032 0.0432043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 25.57 using 59 PHA bins.
# Reduced chi-squared = 0.4485 for 57 degrees of freedom
# Null hypothesis probability = 9.998968e-01
Photon flux (15-150 keV) in 0.004 sec: 20.0458 ( -6.31336 6.32331 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74197e-09 ( -1.23499e-09 1.29249e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.31498 ( 6.36999 6.7285 )
Epeak [keV] : 25.1593 ( -4.83852 3.20677 )
Norm@50keV : 3.59172E+05 ( -446309 1.72179e+08 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 21.28 using 59 PHA bins.
# Reduced chi-squared = 0.3799 for 56 degrees of freedom
# Null hypothesis probability = 9.999931e-01
Photon flux (15-150 keV) in 0.004 sec: 23.3794 ( -6.9893 6.9932 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68929e-09 ( -1.06548e-09 1.06615e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38550 ( 1.58157 1.58157 )
beta : -5.38079 ( 8.62136 18.2461 )
Epeak [keV] : 24.0405 ( -7.49755 4.23899 )
Norm@50keV : 1.70450E+04 ( -16862.9 22106.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 21.09 using 59 PHA bins.
# Reduced chi-squared = 0.3834 for 55 degrees of freedom
# Null hypothesis probability = 9.999902e-01
Photon flux (15-150 keV) in 0.004 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] : 5.71955 (-0.939299 1.14945)
R^2/D10^2 : 110.155 (-69.2048 148.707)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 22.64 using 59 PHA bins.
# Reduced chi-squared = 0.3971 for 57 degrees of freedom
# Null hypothesis probability = 9.999872e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.782e-09 9.786e-10
25- 50 1.598e-09 9.327e-10
50-150 1.198e-10 8.930e-11
15-150 3.500e-09 1.719e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.1505 (-6.75345 17.1532)
Norm : 270.608 (-154.215 251.203)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 24.70 using 59 PHA bins.
# Reduced chi-squared = 0.4333 for 57 degrees of freedom
# Null hypothesis probability = 9.999418e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.617e-09 7.874e-10
25- 50 1.368e-09 7.012e-10
50-150 3.806e-10 3.027e-10
15-150 3.365e-09 1.710e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.02370 (-1.10841 1.17636)
R1^2/D10^2 : 176.205 (-120.43 263.661)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 5.01060E-03 (-0.00447945 0.202664)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 19.14 using 59 PHA bins.
# Reduced chi-squared = 0.3480 for 55 degrees of freedom
# Null hypothesis probability = 9.999983e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.772e-09 1.078e-09
25- 50 1.372e-09 8.446e-10
50-150 5.355e-09 8.066e-11
15-150 8.499e-09 2.326e-09
Plot creation:
Thu May 7 16:54:25 EDT 2020