batgrbproduct analysis for trigger=992099
batgrbproduct Analysis for Trigger=992099
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): Thu Aug 20 20:54:26 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger992099/batgroup_hand_proc
======================================================================
Trigger: 00992099 Segment: 000
BAT Trigger Time: 619544658.368 [s; MET]
Trigger Stop: 619544660.416 [s; MET]
UTC: 2020-08-19T15:43:52.881500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 21.4278910398901 Dec: 63.047912047578 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.88
Image Trigger?: NO
Rate S/N Ratio: 11.0905365064094 [ if not an image trigger ]
Image S/N Ratio: 7.88
Flight Position: [ source = BAT ]
RA: 21.4278910398901 Dec: 63.047912047578 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 21.5266904113403 Dec: 63.0609177471702 [deg; J2000]
{ 01h 26m 06.4s , +63d 03' 39.3" }
+/- 2.08781395503283 [arcmin] (estimated 90% radius based on SNR)
+/- 1.05948624955345 [arcmin] (formal 1-sigma fit error)
SNR: 10.6271256164935
Angular difference between Flight and Ground position is 2.797269 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 23.6160000562668 +/- 6.74221570087979
Measured from: 0.2882000207901
to: 23.9042000770569 [s; relative to TRIGTIME]
T50: 11.2000000476837 +/- 5.8364318183087
Measured from: 2.16019999980927
to: 13.360200047493 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.308200001716614
to: 1.30820000171661 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.719799995422363
to: 27.1201999187469 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.252165 0.226281 0.135690 0.013949
0.031650 0.032569 0.028546 0.024950 [error]
Peak 0.012458 0.032485 0.031898 0.011031
0.006192 0.006492 0.005978 0.005090 [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 7.59e-08 9.80e-08 9.26e-08 1.55e-07 3.18e-07 4.21e-07 erg/cm2
Error 1.51e-08 1.50e-08 2.72e-08 8.93e-08 6.11e-08 1.21e-07 erg/cm2
Peak flux Power-law 1.49e-01 1.93e-01 1.82e-01 3.05e-01 6.27e-01 8.29e-01 ph/cm2/s
Error 6.74e-02 5.39e-02 4.64e-02 1.67e-01 1.48e-01 2.06e-01 ph/cm2/s
Fluence Cutoff-PL 7.62e-08 9.80e-08 9.20e-08 1.51e-07 3.17e-07 4.17e-07 erg/cm2
Error 1.16e-08 1.67e-08 2.77e-08 1.29e-07 6.35e-08 1.42e-07 erg/cm2
Peak flux Cutoff-PL 1.30e-01 2.01e-01 1.94e-01 1.69e-01 6.12e-01 6.94e-01 ph/cm2/s
Error 7.99e-02 6.06e-02 5.59e-02 1.91e-01 1.52e-01 2.63e-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 2.082 0.308 - - 1.23e-03 2.60e-04 55.070 57
CPL 1.982 0.000 9.3 0.0 1.39e-03 0.00e+00 55.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.082 0.400 - - 5.41e-03 1.24e-03 63.880 57
CPL 0.483 1.989 139.4 0.0 1.03e-02 3.25e-02 63.390 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: 6.400000 sec.
T50 in the 50-300 keV band: 3.968000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 27.840 -0.720 27.120
T90 23.616 0.288 23.904
T50 11.200 2.160 13.360
Peak 1.000 0.308 1.308
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
21.5267 +63.0609 0.0181 22.3 -167.6 0.7142 10.6 TRIG_00992099
------------------------------------------
Foreground time interval of the image:
-0.720 25.533 (delta_t = 26.252 [sec])
Background time interval of the image:
-60.368 -0.720 (delta_t = 59.648 [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 -0.720 sec. to 27.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08182 ( -0.291662 0.324434 )
Norm@50keV : 1.23292E-03 ( -0.000265728 0.000254574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.07 using 59 PHA bins.
# Reduced chi-squared = 0.9662 for 57 degrees of freedom
# Null hypothesis probability = 5.476826e-01
Photon flux (15-150 keV) in 27.84 sec: 0.192248 ( -0.0280132 0.0280143 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18375e-07 ( -5.9846e-08 6.23379e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.720 sec. to 27.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98179 ( )
Epeak [keV] : 9.30416 ( )
Norm@50keV : 1.38802E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.16 using 59 PHA bins.
# Reduced chi-squared = 0.9850 for 56 degrees of freedom
# Null hypothesis probability = 5.067376e-01
Photon flux (15-150 keV) in 27.84 sec: 0.192180 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17326e-07 ( -6.44095e-08 6.25426e-08 ) ergs/cm2
Band function
Time interval is from -0.720 sec. to 27.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.56109 ( 2.56109 2.56109 )
beta : -2.08182 ( -0.324432 0.291899 )
Epeak [keV] : 12.5352 ( -12.5352 -12.5352 )
Norm@50keV : 0.167572 ( -0.0361161 0.0346003 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.07 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.718393e-01
Photon flux (15-150 keV) in 27.84 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] : 8.32120 (-1.63688 2.11608)
R^2/D10^2 : 0.173762 (-0.10033 0.237372)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.75 using 59 PHA bins.
# Reduced chi-squared = 1.241 for 57 degrees of freedom
# Null hypothesis probability = 1.041910e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.227e-08 1.764e-08
25- 50 1.166e-07 2.994e-08
50-150 3.478e-08 1.638e-08
15-150 2.136e-07 4.819e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 59.0746 (-22.7649 47.7968)
Norm : 1.00675 (-0.233675 0.331053)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.87 using 59 PHA bins.
# Reduced chi-squared = 0.9977 for 57 degrees of freedom
# Null hypothesis probability = 4.800554e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.026e-08 1.370e-08
25- 50 1.064e-07 2.293e-08
50-150 1.195e-07 5.181e-08
15-150 2.962e-07 8.146e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.93245 (-1.44549 1.70717)
R1^2/D10^2 : 1.09581 (-0.757016 3.91079)
kT2 [keV] : 21.0100 (-7.19705 16.1913)
R2^2/D10^2 : 3.83010E-03 (-0.00328415 0.0152316)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.30 using 59 PHA bins.
# Reduced chi-squared = 0.9874 for 55 degrees of freedom
# Null hypothesis probability = 5.011569e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.913e-08 4.267e-08
25- 50 9.007e-08 4.738e-08
50-150 1.521e-07 9.473e-08
15-150 3.213e-07 1.569e-07
Peak spectrum fit
Power-law model
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08179 ( -0.410921 0.389078 )
Norm@50keV : 5.41328E-03 ( -0.00124589 0.00124278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.88 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 57 degrees of freedom
# Null hypothesis probability = 2.476206e-01
Photon flux (15-150 keV) in 1 sec: 0.626836 ( -0.147341 0.148108 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69294e-08 ( -1.41544e-08 1.43864e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.482511 ( -1.95689 2.021 )
Epeak [keV] : 139.429 ( -139.438 -139.438 )
Norm@50keV : 1.02669E-02 ( -0.00592546 0.0591741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.39 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 56 degrees of freedom
# Null hypothesis probability = 2.319335e-01
Photon flux (15-150 keV) in 1 sec: 0.612026 ( -0.151915 0.152312 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.49973e-08 ( -1.51923e-08 1.521e-08 ) ergs/cm2
Band function
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94851 ( -4.94851 -4.94851 )
beta : -1.33368 ( -0.648836 0.51318 )
Epeak [keV] : 34.0515 ( -34.0515 12.0569 )
Norm@50keV : 66.4446 ( -14.943 1.42774e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.16 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 55 degrees of freedom
# Null hypothesis probability = 2.362336e-01
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] : 20.9572 (-5.53761 8.23458)
R^2/D10^2 : 2.57751E-02 (-0.016698 0.0437948)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.89 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.964011e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.141e-09 1.123e-09
25- 50 1.099e-08 5.437e-09
50-150 3.597e-08 1.924e-08
15-150 4.910e-08 2.277e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-77.0181 -200)
Norm : 2.57423 (-0.609889 0.609889)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.41 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.628477e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.413e-09 3.794e-09
25- 50 1.234e-08 7.320e-09
50-150 2.706e-08 1.601e-08
15-150 4.581e-08 2.750e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.56661 (-3.4429 10.5541)
R1^2/D10^2 : 0.353303 (-0.342662 3.91567)
kT2 [keV] : 29.7045 (-20.6861 -29.669)
R2^2/D10^2 : 7.20907E-03 (-0.00684377 0.025994)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.45 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 55 degrees of freedom
# Null hypothesis probability = 2.286110e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.500e-09 3.224e-09
25- 50 1.170e-08 6.450e-09
50-150 3.969e-08 2.287e-08
15-150 5.589e-08 3.146e-08
Plot creation:
Thu Aug 20 21:03:01 EDT 2020