batgrbproduct analysis for trigger=992444
batgrbproduct Analysis for Trigger=992444
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): Sat Aug 22 18:26:22 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger992444/GCN5_download_cron
======================================================================
Trigger: 00992444 Segment: 000
BAT Trigger Time: 619708531.008 [s; MET]
Trigger Stop: 619708547.392 [s; MET]
UTC: 2020-08-21T13:15:05.510760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 353.56993085405 Dec: -48.2773715855596 [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: 18.2208671582886 [ if not an image trigger ]
Image S/N Ratio: 7.51
Flight Position: [ source = BAT ]
RA: 353.56993085405 Dec: -48.2773715855596 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 353.584002361195 Dec: -48.3042146227599 [deg; J2000]
{ 23h 34m 20.2s , -48d 18' 15.2" }
+/- 3.68397339034591 [arcmin] (estimated 90% radius based on SNR)
+/- 2.43876019072627 [arcmin] (formal 1-sigma fit error)
SNR: 4.7216613006172
Angular difference between Flight and Ground position is 1.705736 arcmin
Partial Coding Fraction: 0.78125 [ including projection effects ]
Duration
T90: 16.3839999437332 +/-
Measured from: 0
to: 16.3839999437332 [s; relative to TRIGTIME]
T50: 16.3839999437332 +/-
Measured from: 0
to: 16.3839999437332 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 16.3839999437332 second)
Measured from: 5.96046447753906e-08
to: 16.3840000033379 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 16.3839999437332 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.133923 0.027707 -0.017816 0.010570
0.028431 0.028496 0.024333 0.021109 [error]
Peak 0.133923 0.027707 -0.017816 0.010570
0.028431 0.028496 0.024333 0.021109 [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 3.48e-08 2.11e-08 8.01e-09 4.05e-09 6.62e-08 6.68e-08 erg/cm2
Error 1.32e-08 1.26e-08 1.04e-08 1.06e-08 3.25e-08 3.70e-08 erg/cm2
Peak flux Power-law 7.12e-02 2.43e-02 4.63e-03 1.06e-03 1.01e-01 1.01e-01 ph/cm2/s
Error 2.74e-02 1.40e-02 5.87e-03 2.48e-03 4.00e-02 4.04e-02 ph/cm2/s
Fluence Cutoff-PL 4.80e-08 1.98e-08 1.84e-11 3.05e-20 6.79e-08 6.78e-08 erg/cm2
Error 1.52e-08 9.66e-09 1.16e-10 2.50e-16 2.12e-08 2.12e-08 erg/cm2
Peak flux Cutoff-PL 9.40e-02 2.55e-02 1.22e-05 9.08e-15 1.20e-01 1.20e-01 ph/cm2/s
Error 3.05e-02 1.23e-02 8.23e-05 9.37e-11 3.62e-02 3.62e-02 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 3.351 1.001 - - 2.81e-04 2.86e-04 64.340 57
CPL -9.999 -2.603 21.3 2.5 7.47e+06 2.87e+07 53.370 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.351 1.001 - - 2.81e-04 2.86e-04 64.340 57
CPL -9.999 -2.603 21.3 2.5 7.47e+06 2.87e+07 53.370 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 16.384 0.000 16.384
T90 16.384 0.000 16.384
T50 16.384 0.000 16.384
Peak 16.384 0.000 16.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
353.5840 -48.3042 0.0408 32.7 -162.4 0.2581 4.7 TRIG_00992444
------------------------------------------
Foreground time interval of the image:
0.000 16.384 (delta_t = 16.384 [sec])
Background time interval of the image:
-126.507 -35.008 (delta_t = 91.499 [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 16.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.35145 ( -0.865843 1.13613 )
Norm@50keV : 2.80732E-04 ( -0.000278007 0.000293424 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.34 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.352267e-01
Photon flux (15-150 keV) in 16.38 sec: 0.100782 ( -0.0394713 0.0405547 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.62286e-08 ( -2.84814e-08 3.65222e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.99898 ( 9.9997 4.79437 )
Epeak [keV] : 21.3283 ( -2.47542 2.46851 )
Norm@50keV : 7.46662E+06 ( -7.51278e+06 4.98858e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9529 for 56 degrees of freedom
# Null hypothesis probability = 5.752279e-01
Photon flux (15-150 keV) in 16.38 sec: 0.119636 0.119846 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.724e-17 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -1.4033 -5 )
beta : -9.37167 ( 9.37167 5.33909 )
Epeak [keV] : 20.0713 ( -3.17495 3.50581 )
Norm@50keV : 955.353 ( -302.008 2550.36 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.22 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.289096e-01
Photon flux (15-150 keV) in 16.38 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] : 4.47917 (-1.02995 1.23424)
R^2/D10^2 : 1.69634 (-1.68029 3.90281)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.62 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.159071e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.260e-08 2.482e-08
25- 50 2.100e-08 1.455e-08
50-150 4.867e-10 5.980e-10
15-150 6.409e-08 4.104e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9054 (-5.12011 10.2668)
Norm : 2.65282 (-1.58388 4.50163)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.67 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.126261e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.868e-08 2.314e-08
25- 50 2.072e-08 1.447e-08
50-150 2.217e-09 2.511e-09
15-150 6.162e-08 3.988e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.50180 (-0.984925 1.28018)
R1^2/D10^2 : 1.66329 (-1.65041 3.92934)
kT2 [keV] : 9.99616E-04 (-0.000999616 -0.000999616)
R2^2/D10^2 : 1.19878E-04 (-0.000120098 -0.000120098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.61 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Null hypothesis probability = 3.443809e-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 16.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.35145 ( -0.865843 1.13613 )
Norm@50keV : 2.80732E-04 ( -0.000278007 0.000293424 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.34 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.352267e-01
Photon flux (15-150 keV) in 16.38 sec: 0.100782 ( -0.0394713 0.0405547 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.62286e-08 ( -2.84814e-08 3.65222e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.99898 ( 9.9997 4.79437 )
Epeak [keV] : 21.3283 ( -2.47542 2.46851 )
Norm@50keV : 7.46662E+06 ( -7.51278e+06 4.98858e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9529 for 56 degrees of freedom
# Null hypothesis probability = 5.752279e-01
Photon flux (15-150 keV) in 16.38 sec: 0.119636 0.119846 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.724e-17 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -1.4033 -5 )
beta : -9.37167 ( 9.37167 5.33909 )
Epeak [keV] : 20.0713 ( -3.17495 3.50581 )
Norm@50keV : 955.353 ( -302.008 2550.36 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.22 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.289096e-01
Photon flux (15-150 keV) in 16.38 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] : 4.47917 (-1.02995 1.23424)
R^2/D10^2 : 1.69634 (-1.68029 3.90281)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.62 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.159071e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.260e-08 2.523e-08
25- 50 2.100e-08 1.512e-08
50-150 4.867e-10 5.567e-10
15-150 6.409e-08 4.182e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9054 (-5.12011 10.2668)
Norm : 2.65282 (-1.58388 4.50163)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.67 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.126261e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.868e-08 2.307e-08
25- 50 2.072e-08 1.450e-08
50-150 2.217e-09 2.651e-09
15-150 6.162e-08 3.826e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.50180 (-0.984925 1.28018)
R1^2/D10^2 : 1.66329 (-1.65041 3.92934)
kT2 [keV] : 9.99616E-04 (-0.000999616 -0.000999616)
R2^2/D10^2 : 1.19878E-04 (-0.000120098 -0.000120098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.61 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Null hypothesis probability = 3.443809e-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:
Sat Aug 22 18:30:18 EDT 2020