batgrbproduct analysis for trigger=994143
batgrbproduct Analysis for Trigger=994143
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 Sep 2 11:14:48 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger994143/GCN5_download_cron
======================================================================
Trigger: 00994143 Segment: 000
BAT Trigger Time: 620624877.12 [s; MET]
Trigger Stop: 620624878.144 [s; MET]
UTC: 2020-09-01T03:47:31.562720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 61.7575803016358 Dec: -59.8799948410037 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.5
Image Trigger?: NO
Rate S/N Ratio: 44 [ if not an image trigger ]
Image S/N Ratio: 17.5
Flight Position: [ source = BAT ]
RA: 61.7575803016358 Dec: -59.8799948410037 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 61.7594126084243 Dec: -59.9009342569794 [deg; J2000]
{ 04h 07m 02.3s , -59d 54' 03.4" }
+/- 1.13198947771631 [arcmin] (estimated 90% radius based on SNR)
+/- 0.366077795860544 [arcmin] (formal 1-sigma fit error)
SNR: 25.480073713928
Angular difference between Flight and Ground position is 1.257575 arcmin
Partial Coding Fraction: 0.2148438 [ including projection effects ]
Duration
T90: 20.3680000305176 +/- 7.54577711369563
Measured from: -3.8879998922348
to: 16.4800001382828 [s; relative to TRIGTIME]
T50: 4.96000003814697 +/- 0.860139494915862
Measured from: -1.45599985122681
to: 3.50400018692017 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0119999647140503
to: 0.98800003528595 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.432000041008
to: 26.5920000076294 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.375460 1.742478 1.232227 0.313419
0.087877 0.090747 0.077560 0.064697 [error]
Peak 0.241232 0.321459 0.279493 0.043329
0.021305 0.024499 0.020862 0.013807 [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 4.91e-07 7.91e-07 9.63e-07 2.30e-06 2.90e-06 4.55e-06 erg/cm2
Error 4.92e-08 4.81e-08 7.83e-08 3.99e-07 1.86e-07 4.60e-07 erg/cm2
Peak flux Power-law 2.90e+00 2.59e+00 1.59e+00 1.48e+00 7.71e+00 8.57e+00 ph/cm2/s
Error 3.69e-01 2.14e-01 1.67e-01 3.02e-01 6.32e-01 6.84e-01 ph/cm2/s
Fluence Cutoff-PL 4.85e-07 7.98e-07 9.68e-07 2.02e-06 2.89e-06 4.27e-06 erg/cm2
Error 5.56e-08 5.58e-08 8.17e-08 7.06e-07 2.00e-07 8.20e-07 erg/cm2
Peak flux Cutoff-PL 2.57e+00 2.75e+00 1.72e+00 8.53e-01 7.57e+00 7.90e+00 ph/cm2/s
Error 4.45e-01 2.56e-01 2.02e-01 4.08e-01 6.43e-01 7.63e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.55e+00 2.76e+00 1.72e+00 8.32e-01 7.55e+00 7.87e+00 ph/cm2/s
Error 3.88e-01 2.46e-01 -------- -------- 6.26e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.716 0.107 - - 1.01e-02 6.20e-04 60.350 57
CPL 1.636 0.409 223.7 0.0 1.11e-02 0.00e+00 60.220 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.703 0.131 - - 5.80e-02 4.87e-03 67.500 57
CPL 1.074 0.536 77.2 54.5 1.19e-01 7.72e-02 62.860 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: 12.096000 sec.
T50 in the 50-300 keV band: 4.480000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 31.024 -4.432 26.592
T90 20.368 -3.888 16.480
T50 4.960 -1.456 3.504
Peak 1.000 -0.012 0.988
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
61.7594 -59.9009 0.0076 39.9 136.3 4.8846 25.5 TRIG_00994143
------------------------------------------
Foreground time interval of the image:
-4.432 26.592 (delta_t = 31.024 [sec])
Background time interval of the image:
-239.120 -190.000 (delta_t = 49.120 [sec])
-183.120 -4.432 (delta_t = 178.688 [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 -4.432 sec. to 26.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71585 ( -0.105972 0.10707 )
Norm@50keV : 1.01137E-02 ( -0.000621858 0.000618562 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.35 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.558016e-01
Photon flux (15-150 keV) in 31.02 sec: 1.35073 ( -0.0829613 0.0831346 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90125e-06 ( -1.85396e-07 1.86204e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.432 sec. to 26.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63571 ( -0.408078 0.41019 )
Epeak [keV] : 223.651 ( )
Norm@50keV : 1.11195E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.22 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 56 degrees of freedom
# Null hypothesis probability = 3.257140e-01
Photon flux (15-150 keV) in 31.02 sec: 1.34511 ( -0.08675 0.08632 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88514e-06 ( -2.01174e-07 1.98491e-07 ) ergs/cm2
Band function
Time interval is from -4.432 sec. to 26.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.67369E-02 ( -1.49587 -1.49587 )
beta : -1.78189 ( 1.763 0.129994 )
Epeak [keV] : 32.4745 ( -25.457 157.111 )
Norm@50keV : 0.142428 ( -0.142437 23.1085 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.95 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 55 degrees of freedom
# Null hypothesis probability = 3.331910e-01
Photon flux (15-150 keV) in 31.02 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] : 13.2711 ( )
R^2/D10^2 : 0.220009 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 145.19 using 59 PHA bins.
# Reduced chi-squared = 2.5472 for 57 degrees of freedom
# Null hypothesis probability = 1.229345e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.548e-07 2.911e-08
25- 50 8.971e-07 6.126e-08
50-150 1.011e-06 1.253e-07
15-150 2.163e-06 1.610e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 141.467 (-35.5931 46.4091)
Norm : 5.50902 (-0.391311 0.51418)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.36 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.915752e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.409e-07 3.909e-08
25- 50 8.102e-07 8.282e-08
50-150 1.560e-06 4.824e-07
15-150 2.811e-06 5.653e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.70963 (-1.03361 1.16368)
R1^2/D10^2 : 1.92820 (-0.824032 1.63551)
kT2 [keV] : 26.6131 (-4.73565 7.82244)
R2^2/D10^2 : 1.36494E-02 (-0.00800992 0.0145268)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.77 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.066337e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.634e-07 9.402e-08
25- 50 8.149e-07 1.546e-07
50-150 1.603e-06 4.704e-07
15-150 2.881e-06 6.099e-07
Peak spectrum fit
Power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70279 ( -0.128862 0.13278 )
Norm@50keV : 5.80182E-02 ( -0.00489156 0.00485635 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.50 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 57 degrees of freedom
# Null hypothesis probability = 1.610531e-01
Photon flux (15-150 keV) in 1 sec: 7.71295 ( -0.631672 0.632393 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.37063e-07 ( -4.70058e-08 4.71701e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07351 ( -0.566037 0.5061 )
Epeak [keV] : 77.2040 ( -16.8062 92.2082 )
Norm@50keV : 0.118770 ( -0.0509907 0.103418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.86 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.463846e-01
Photon flux (15-150 keV) in 1 sec: 7.56530 ( -0.64332 0.64363 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.28533e-07 ( -4.8303e-08 4.8306e-08 ) ergs/cm2
Band function
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07491 ( -0.523877 0.561222 )
beta : -10.0000 ( 10 1.24345e-14 )
Epeak [keV] : 77.2834 ( -16.8948 92.1439 )
Norm@50keV : 0.118542 ( -0.0507793 0.103493 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.86 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.178858e-01
Photon flux (15-150 keV) in 1 sec: 7.55089 ( -0.55089 -0.61254 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.27647e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6058 (-1.35981 1.49636)
R^2/D10^2 : 0.958283 (-0.286736 0.404911)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 98.27 using 59 PHA bins.
# Reduced chi-squared = 1.724 for 57 degrees of freedom
# Null hypothesis probability = 5.626692e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.297e-08 6.120e-09
25- 50 1.665e-07 1.640e-08
50-150 2.389e-07 3.770e-08
15-150 4.484e-07 4.405e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 143.425 (-39.3215 -141.359)
Norm : 32.0654 (-2.93579 3.49447)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.46 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.593847e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.265e-08 8.380e-09
25- 50 1.522e-07 2.105e-08
50-150 2.948e-07 1.220e-07
15-150 5.296e-07 1.384e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.89621 (-1.23976 1.62014)
R1^2/D10^2 : 29.8625 (-20.2058 82.3978)
kT2 [keV] : 20.0745 (-2.67499 3.54686)
R2^2/D10^2 : 0.257051 (-0.122639 0.192776)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.42 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 55 degrees of freedom
# Null hypothesis probability = 3.178168e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.667e-08 3.836e-08
25- 50 1.409e-07 3.318e-08
50-150 2.991e-07 6.635e-08
15-150 5.267e-07 1.157e-07
Plot creation:
Wed Sep 2 11:20:13 EDT 2020