batgrbproduct analysis for trigger=960986
batgrbproduct Analysis for Trigger=960986
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 v2.46
Process Start Time (local time): Fri Mar 13 20:56:14 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger960986/GCN5_download_cron
======================================================================
Trigger: 00960986 Segment: 000
BAT Trigger Time: 605740631.916 [s; MET]
Trigger Stop: 605740631.924 [s; MET]
UTC: 2020-03-12T21:16:47.328540 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 274.470542068872 Dec: -16.1017633943807 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.4
Image Trigger?: NO
Rate S/N Ratio: 23.9791576165636 [ if not an image trigger ]
Image S/N Ratio: 7.4
Flight Position: [ source = BAT ]
RA: 274.470542068872 Dec: -16.1017633943807 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.51539803532 Dec: -16.1254866583063 [deg; J2000]
{ 18h 18m 03.7s , -16d 07' 31.8" }
+/- 2.66774579708055 [arcmin] (estimated 90% radius based on SNR)
+/- 1.54302599725958 [arcmin] (formal 1-sigma fit error)
SNR: 7.4875649443355
Angular difference between Flight and Ground position is 2.951525 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 0.00800001621246338 +/- 0.0357770002083318
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
T50: 0.00800001621246338 +/- 0.016
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.00800001621246338 second)
Measured from: 5.96046447753906e-08
to: 0.00800007581710815 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.005933 0.009625 0.000917 0.000140
0.001585 0.001507 0.000746 0.000456 [error]
Peak 0.005933 0.009625 0.000917 0.000140
0.001585 0.001507 0.000746 0.000456 [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 1.40e-09 9.53e-10 4.24e-10 2.61e-10 2.91e-09 3.04e-09 erg/cm2
Error 5.57e-10 3.67e-10 2.75e-10 3.50e-10 1.05e-09 1.14e-09 erg/cm2
Peak flux Power-law 5.86e+00 2.25e+00 4.99e-01 1.33e-01 8.69e+00 8.74e+00 ph/cm2/s
Error 2.36e+00 8.46e-01 3.15e-01 1.68e-01 3.10e+00 3.10e+00 ph/cm2/s
Fluence Cutoff-PL 2.01e-09 2.25e-09 1.95e-11 4.00e-18 4.29e-09 4.29e-09 erg/cm2
Error 6.33e-10 7.36e-10 2.89e-11 2.27e-16 1.13e-09 1.13e-09 erg/cm2
Peak flux Cutoff-PL 7.61e+00 5.80e+00 3.15e-02 4.02e-09 1.34e+01 1.34e+01 ph/cm2/s
Error 2.48e+00 1.83e+00 4.12e-02 1.65e-07 3.52e+00 3.52e+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 3.171 0.626 - - 2.78e-02 1.43e-02 51.910 57
CPL 1.000 0.000 50.0 0.0 8.52e-02 0.00e+00 62.510 56
The chi2 of BB fit is 43.20 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.171 0.626 - - 2.78e-02 1.43e-02 51.910 57
CPL 1.000 0.000 50.0 0.0 8.52e-02 0.00e+00 62.510 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 0.008 0.000 0.008
T90 0.008 0.000 0.008
T50 0.008 0.000 0.008
Peak 0.008 0.000 0.008
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.5154 -16.1255 0.0258 16.9 -154.2 0.0169 7.5 TRIG_00960986
------------------------------------------
Foreground time interval of the image:
0.000 0.008 (delta_t = 0.008 [sec])
Background time interval of the image:
-30.415 -7.916 (delta_t = 22.499 [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 0.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.17110 ( -0.58126 0.671666 )
Norm@50keV : 2.78308E-02 ( -0.0140239 0.0145754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.91 using 59 PHA bins.
# Reduced chi-squared = 0.9108 for 57 degrees of freedom
# Null hypothesis probability = 6.657791e-01
Photon flux (15-150 keV) in 0.008 sec: 8.69093 ( -3.09553 3.09668 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90863e-09 ( -1.04496e-09 1.05163e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 8.51552E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.51 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 56 degrees of freedom
# Null hypothesis probability = 2.561267e-01
Photon flux (15-150 keV) in 0.008 sec: 13.4320 13.4338 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88671e-13 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.85986 ( 3.67776 8.85986 )
beta : -3.17048 ( -0.672604 0.581498 )
Epeak [keV] : 55.1483 ( -55.1483 -55.1483 )
Norm@50keV : 3.78412 ( -1.90629 1.98083 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.91 using 59 PHA bins.
# Reduced chi-squared = 0.9439 for 55 degrees of freedom
# Null hypothesis probability = 5.932689e-01
Photon flux (15-150 keV) in 0.008 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] : 5.48017 (-0.823942 0.877581)
R^2/D10^2 : 69.2398 (-38.6701 78.8031)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.20 using 59 PHA bins.
# Reduced chi-squared = 0.7579 for 57 degrees of freedom
# Null hypothesis probability = 9.116014e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.918e-09 8.978e-10
25- 50 1.560e-09 8.440e-10
50-150 9.702e-11 8.491e-11
15-150 3.574e-09 1.822e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.7933 (-5.00842 8.01109)
Norm : 167.791 (-88.4401 140.748)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.73 using 59 PHA bins.
# Reduced chi-squared = 0.8549 for 57 degrees of freedom
# Null hypothesis probability = 7.740952e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.654e-09 7.102e-10
25- 50 1.184e-09 5.916e-10
50-150 2.312e-10 1.837e-10
15-150 3.070e-09 1.426e-09
Double BB
R1^2/D10^2 : 74.8153 (-38.7153 78.7577)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 3.99879E-04 (-0.000397652 -0.000397652)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.20 using 59 PHA bins.
#Fit statistic : Chi-Squared = 42.62 using 59 PHA bins.
#Fit statistic : Chi-Squared = 42.23 using 59 PHA bins.
# Reduced chi-squared = 0.7855 for 55 degrees of freedom
# Reduced chi-squared = 0.7749 for 55 degrees of freedom
# Reduced chi-squared = 0.7679 for 55 degrees of freedom
# Null hypothesis probability = 8.754517e-01
# Null hypothesis probability = 8.883213e-01
# Null hypothesis probability = 8.964846e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.17110 ( -0.58126 0.671666 )
Norm@50keV : 2.78308E-02 ( -0.0140239 0.0145754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.91 using 59 PHA bins.
# Reduced chi-squared = 0.9108 for 57 degrees of freedom
# Null hypothesis probability = 6.657791e-01
Photon flux (15-150 keV) in 0.008 sec: 8.69093 ( -3.09553 3.09668 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90863e-09 ( -1.04496e-09 1.05163e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 8.51552E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.51 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 56 degrees of freedom
# Null hypothesis probability = 2.561267e-01
Photon flux (15-150 keV) in 0.008 sec: 13.4320 13.4338 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88671e-13 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.85986 ( 3.67776 8.85986 )
beta : -3.17048 ( -0.672604 0.581498 )
Epeak [keV] : 55.1483 ( -55.1483 -55.1483 )
Norm@50keV : 3.78412 ( -1.90629 1.98083 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.91 using 59 PHA bins.
# Reduced chi-squared = 0.9439 for 55 degrees of freedom
# Null hypothesis probability = 5.932689e-01
Photon flux (15-150 keV) in 0.008 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] : 5.48017 (-0.823942 0.877581)
R^2/D10^2 : 69.2398 (-38.6701 78.8031)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.20 using 59 PHA bins.
# Reduced chi-squared = 0.7579 for 57 degrees of freedom
# Null hypothesis probability = 9.116014e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.918e-09 1.059e-09
25- 50 1.560e-09 8.449e-10
50-150 9.702e-11 7.825e-11
15-150 3.574e-09 1.721e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.7933 (-5.00842 8.01109)
Norm : 167.791 (-88.4401 140.748)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.73 using 59 PHA bins.
# Reduced chi-squared = 0.8549 for 57 degrees of freedom
# Null hypothesis probability = 7.740952e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.654e-09 7.983e-10
25- 50 1.184e-09 6.398e-10
50-150 2.312e-10 1.996e-10
15-150 3.070e-09 1.409e-09
Double BB
R1^2/D10^2 : 74.8153 (-38.7153 78.7577)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 3.99879E-04 (-0.000397652 -0.000397652)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.20 using 59 PHA bins.
#Fit statistic : Chi-Squared = 42.62 using 59 PHA bins.
#Fit statistic : Chi-Squared = 42.23 using 59 PHA bins.
# Reduced chi-squared = 0.7855 for 55 degrees of freedom
# Reduced chi-squared = 0.7749 for 55 degrees of freedom
# Reduced chi-squared = 0.7679 for 55 degrees of freedom
# Null hypothesis probability = 8.754517e-01
# Null hypothesis probability = 8.883213e-01
# Null hypothesis probability = 8.964846e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Fri Mar 13 20:58:59 EDT 2020