batgrbproduct analysis for trigger=994724
batgrbproduct Analysis for Trigger=994724
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): Sun Sep 6 17:28:23 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger994724/GCN5_download_cron
======================================================================
Trigger: 00994724 Segment: 000
BAT Trigger Time: 620991416 [s; MET]
Trigger Stop: 620991480 [s; MET]
UTC: 2020-09-05T09:36:30.418600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.6576953134638 Dec: 22.2795380763127 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.96
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.96
Flight Position: [ source = BAT ]
RA: 83.6576953134638 Dec: 22.2795380763127 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 83.6746827151635 Dec: 22.2700559914524 [deg; J2000]
{ 05h 34m 41.9s , +22d 16' 12.2" }
+/- 1.37581557654538 [arcmin] (estimated 90% radius based on SNR)
+/- 0.395219042270382 [arcmin] (formal 1-sigma fit error)
SNR: 19.2830268326055
Angular difference between Flight and Ground position is 1.101487 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.076353 0.974716 0.468226 0.077891
0.054440 0.057704 0.054340 0.059193 [error]
Peak 1.076353 0.974716 0.468226 0.077891
0.054440 0.057704 0.054340 0.059193 [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 3.16e-07 3.93e-07 3.55e-07 5.58e-07 1.26e-06 1.62e-06 erg/cm2
Error 3.14e-08 2.77e-08 4.98e-08 1.55e-07 1.09e-07 2.09e-07 erg/cm2
Peak flux Power-law 1.61e-01 1.11e-01 5.03e-02 3.16e-02 3.38e-01 3.54e-01 ph/cm2/s
Error 1.64e-02 7.70e-03 6.78e-03 8.18e-03 2.31e-02 2.43e-02 ph/cm2/s
Fluence Cutoff-PL 3.14e-07 3.94e-07 3.59e-07 5.60e-07 1.26e-06 1.63e-06 erg/cm2
Error 3.30e-08 2.77e-08 5.40e-08 3.56e-07 1.28e-07 3.25e-07 erg/cm2
Peak flux Cutoff-PL 1.61e-01 1.11e-01 5.05e-02 3.17e-02 3.38e-01 3.54e-01 ph/cm2/s
Error 1.73e-02 8.80e-03 7.09e-03 1.39e-02 2.31e-02 2.98e-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 2.145 0.151 - - 2.10e-03 2.07e-04 54.200 57
CPL 2.152 0.254 485.2 0.0 2.08e-03 0.00e+00 54.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.145 0.151 - - 2.10e-03 2.07e-04 54.200 57
CPL 2.152 0.254 485.2 0.0 2.08e-03 0.00e+00 54.210 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
83.6747 +22.2701 0.0100 0.1 -176.6 2.5854 19.3 TRIG_00994724
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14478 ( -0.148181 0.154389 )
Norm@50keV : 2.10173E-03 ( -0.000208729 0.000205494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9508 for 57 degrees of freedom
# Null hypothesis probability = 5.809651e-01
Photon flux (15-150 keV) in 64 sec: 0.338155 ( -0.0231267 0.0231349 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25573e-06 ( -1.07505e-07 1.10177e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15231 ( -0.488981 0.0182246 )
Epeak [keV] : 485.238 ( )
Norm@50keV : 2.08041E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.21 using 59 PHA bins.
# Reduced chi-squared = 0.9681 for 56 degrees of freedom
# Null hypothesis probability = 5.427661e-01
Photon flux (15-150 keV) in 64 sec: 0.337931 ( -0.023039 0.023195 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26113e-06 ( -1.52986e-07 1.03245e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.73737 ( 2.73737 2.73737 )
beta : -2.14477 ( -0.154392 0.148234 )
Epeak [keV] : 9.90572 ( -9.90572 -9.90572 )
Norm@50keV : 0.285655 ( -0.0283695 0.0279292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9854 for 55 degrees of freedom
# Null hypothesis probability = 5.053450e-01
Photon flux (15-150 keV) in 64 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] : 8.42543 (-0.708873 0.785024)
R^2/D10^2 : 0.285414 (-0.0852147 0.12095)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 99.62 using 59 PHA bins.
# Reduced chi-squared = 1.748 for 57 degrees of freedom
# Null hypothesis probability = 4.108744e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.430e-07 2.739e-08
25- 50 4.645e-07 3.856e-08
50-150 1.442e-07 3.347e-08
15-150 8.517e-07 7.168e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 51.1236 (-10.2641 14.8221)
Norm : 1.85425 (-0.232668 0.293474)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.72 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.121894e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.916e-07 2.845e-08
25- 50 4.221e-07 3.373e-08
50-150 4.185e-07 9.050e-08
15-150 1.132e-06 1.104e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.74411 (-0.948009 0.945626)
R1^2/D10^2 : 1.05991 (-0.459477 0.565582)
kT2 [keV] : 22.6476 (-6.19533 11.682)
R2^2/D10^2 : 4.32046E-03 (-0.00322688 0.0102899)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.17 using 59 PHA bins.
# Reduced chi-squared = 0.9850 for 55 degrees of freedom
# Null hypothesis probability = 5.062067e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.045e-07 5.702e-08
25- 50 3.915e-07 8.755e-08
50-150 5.530e-07 2.906e-07
15-150 1.249e-06 3.741e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14478 ( -0.148181 0.154389 )
Norm@50keV : 2.10173E-03 ( -0.000208729 0.000205494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9508 for 57 degrees of freedom
# Null hypothesis probability = 5.809651e-01
Photon flux (15-150 keV) in 64 sec: 0.338155 ( -0.0231267 0.0231349 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25573e-06 ( -1.07505e-07 1.10177e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15231 ( -0.488981 0.0182246 )
Epeak [keV] : 485.238 ( )
Norm@50keV : 2.08041E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.21 using 59 PHA bins.
# Reduced chi-squared = 0.9681 for 56 degrees of freedom
# Null hypothesis probability = 5.427661e-01
Photon flux (15-150 keV) in 64 sec: 0.337931 ( -0.023039 0.023195 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26113e-06 ( -1.52986e-07 1.03245e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.73737 ( 2.73737 2.73737 )
beta : -2.14477 ( -0.154392 0.148234 )
Epeak [keV] : 9.90572 ( -9.90572 -9.90572 )
Norm@50keV : 0.285655 ( -0.0283695 0.0279292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9854 for 55 degrees of freedom
# Null hypothesis probability = 5.053450e-01
Photon flux (15-150 keV) in 64 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] : 8.42543 (-0.708873 0.785024)
R^2/D10^2 : 0.285414 (-0.0852147 0.12095)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 99.62 using 59 PHA bins.
# Reduced chi-squared = 1.748 for 57 degrees of freedom
# Null hypothesis probability = 4.108744e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.430e-07 2.848e-08
25- 50 4.645e-07 4.077e-08
50-150 1.442e-07 3.389e-08
15-150 8.517e-07 7.360e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 51.1236 (-10.2641 14.8221)
Norm : 1.85425 (-0.232668 0.293474)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.72 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.121894e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.916e-07 2.912e-08
25- 50 4.221e-07 3.242e-08
50-150 4.185e-07 8.774e-08
15-150 1.132e-06 1.034e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.74411 (-0.948009 0.945626)
R1^2/D10^2 : 1.05991 (-0.459477 0.565582)
kT2 [keV] : 22.6476 (-6.19533 11.682)
R2^2/D10^2 : 4.32046E-03 (-0.00322688 0.0102899)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.17 using 59 PHA bins.
# Reduced chi-squared = 0.9850 for 55 degrees of freedom
# Null hypothesis probability = 5.062067e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.045e-07 6.640e-08
25- 50 3.915e-07 8.694e-08
50-150 5.530e-07 2.981e-07
15-150 1.249e-06 3.645e-07
Plot creation:
Sun Sep 6 17:33:30 EDT 2020