batgrbproduct analysis for trigger=994389
batgrbproduct Analysis for Trigger=994389
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): Fri Sep 4 05:27:26 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger994389/GCN5_download_cron
======================================================================
Trigger: 00994389 Segment: 000
BAT Trigger Time: 620786688 [s; MET]
Trigger Stop: 620786689.024 [s; MET]
UTC: 2020-09-03T00:44:22.432080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 164.311253143984 Dec: 50.500692051524 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.74
Image Trigger?: NO
Rate S/N Ratio: 43.7264222181509 [ if not an image trigger ]
Image S/N Ratio: 17.74
Flight Position: [ source = BAT ]
RA: 164.311253143984 Dec: 50.500692051524 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 164.312727492889 Dec: 50.4877082911858 [deg; J2000]
{ 10h 57m 15.1s , +50d 29' 15.7" }
+/- 0.769800467467745 [arcmin] (estimated 90% radius based on SNR)
+/- 0.358771385847976 [arcmin] (formal 1-sigma fit error)
SNR: 44.2013240969653
Angular difference between Flight and Ground position is 0.781056 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 24.1480000019073 +/- 7.68346850689975
Measured from: -15.4679999351501
to: 8.6800000667572 [s; relative to TRIGTIME]
T50: 5.72399997711182 +/- 0.678657511965394
Measured from: -1.49999988079071
to: 4.22400009632111 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.144000053405762
to: 1.14400005340576 [s; relative to TRIGTIME]
Total Fluence
Measured from: -19.1759999990463
to: 22.1280000209808 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.225023 1.745862 1.315589 0.205376
0.051744 0.055009 0.048663 0.041718 [error]
Peak 0.112014 0.168826 0.145428 0.026152
0.009460 0.011183 0.010164 0.007315 [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 4.17e-07 7.40e-07 1.01e-06 2.83e-06 2.91e-06 4.99e-06 erg/cm2
Error 2.86e-08 3.00e-08 4.99e-08 3.08e-07 1.20e-07 3.42e-07 erg/cm2
Peak flux Power-law 1.13e+00 1.23e+00 9.45e-01 1.19e+00 3.75e+00 4.50e+00 ph/cm2/s
Error 1.37e-01 9.40e-02 8.17e-02 2.07e-01 2.69e-01 3.29e-01 ph/cm2/s
Fluence Cutoff-PL 3.85e-07 7.66e-07 1.03e-06 1.61e-06 2.82e-06 3.79e-06 erg/cm2
Error 3.49e-08 3.49e-08 5.44e-08 -------- 1.34e-07 6.04e-07 erg/cm2
Peak flux Cutoff-PL 9.89e-01 1.31e+00 1.02e+00 6.05e-01 3.67e+00 3.92e+00 ph/cm2/s
Error 1.65e-01 1.13e-01 9.78e-02 2.81e-01 2.75e-01 3.88e-01 ph/cm2/s
Fluence Band 3.74e-07 7.75e-07 9.95e-07 2.52e-06 2.85e-06 4.67e-06 erg/cm2
Error 3.95e-08 5.09e-08 3.86e-08 -------- 1.27e-07 -------- erg/cm2
Peak flux Band 1.01e+00 1.29e+00 1.01e+00 6.98e-01 3.70e+00 4.02e+00 ph/cm2/s
Error 1.68e-01 -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.556 0.069 - - 7.50e-03 2.87e-04 51.880 57
CPL 1.151 0.281 107.4 65.8 1.18e-02 3.74e-03 45.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.376 0.116 - - 3.10e-02 2.21e-03 55.460 57
CPL 0.676 0.506 98.5 58.6 6.85e-02 4.14e-02 48.890 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: 12.928000 sec.
T50 in the 50-300 keV band: 5.120000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 41.304 -19.176 22.128
T90 24.148 -15.468 8.680
T50 5.724 -1.500 4.224
Peak 1.000 0.144 1.144
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
164.3127 +50.4877 0.0043 26.8 -45.3 4.5719 44.2 TRIG_00994389
------------------------------------------
Foreground time interval of the image:
-19.176 11.601 (delta_t = 30.777 [sec])
Background time interval of the image:
-239.000 -19.176 (delta_t = 219.824 [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 -19.176 sec. to 22.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55578 ( -0.0687488 0.0689722 )
Norm@50keV : 7.50026E-03 ( -0.000286794 0.000286423 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.88 using 59 PHA bins.
# Reduced chi-squared = 0.9101 for 57 degrees of freedom
# Null hypothesis probability = 6.670863e-01
Photon flux (15-150 keV) in 41.3 sec: 0.951085 ( -0.0376839 0.0377584 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91374e-06 ( -1.19674e-07 1.20072e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -19.176 sec. to 22.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15101 ( -0.289515 0.271634 )
Epeak [keV] : 107.441 ( -25.1218 106.577 )
Norm@50keV : 1.18383E-02 ( -0.00305045 0.00443234 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.20 using 59 PHA bins.
# Reduced chi-squared = 0.8071 for 56 degrees of freedom
# Null hypothesis probability = 8.486766e-01
Photon flux (15-150 keV) in 41.3 sec: 0.927669 ( -0.040541 0.040592 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82464e-06 ( -1.3439e-07 1.34217e-07 ) ergs/cm2
Band function
Time interval is from -19.176 sec. to 22.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15291 ( -0.134525 0.219526 )
beta : -9.35087 ( 9.32521 19.3252 )
Epeak [keV] : 107.168 ( -16.6662 74.2187 )
Norm@50keV : 1.18252E-02 ( -0.000443314 0.00187419 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.20 using 59 PHA bins.
# Reduced chi-squared = 0.8218 for 55 degrees of freedom
# Null hypothesis probability = 8.242737e-01
Photon flux (15-150 keV) in 41.3 sec: 1.24246 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85284e-06 ( -2.85255e-06 -1.27344e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.1923 ( )
R^2/D10^2 : 9.95768E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 179.55 using 59 PHA bins.
# Reduced chi-squared = 3.1499 for 57 degrees of freedom
# Null hypothesis probability = 1.320980e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.983e-07 1.344e-08
25- 50 7.971e-07 4.006e-08
50-150 1.259e-06 9.272e-08
15-150 2.255e-06 9.871e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.339 (-34.8912 -199.344)
Norm : 3.85984 (-0.144564 0.144812)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.64 using 59 PHA bins.
# Reduced chi-squared = 0.8007 for 57 degrees of freedom
# Null hypothesis probability = 8.600827e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.970e-07 1.609e-08
25- 50 7.636e-07 3.263e-08
50-150 1.675e-06 6.216e-08
15-150 2.835e-06 1.206e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.76908 (-0.871328 0.974413)
R1^2/D10^2 : 1.05949 (-0.386795 0.675887)
kT2 [keV] : 24.3092 (-2.59069 3.54074)
R2^2/D10^2 : 1.51912E-02 (-0.00603355 0.00814949)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.66 using 59 PHA bins.
# Reduced chi-squared = 0.7757 for 55 degrees of freedom
# Null hypothesis probability = 8.874553e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.760e-07 4.820e-08
25- 50 7.638e-07 7.331e-08
50-150 1.665e-06 1.933e-07
15-150 2.805e-06 2.757e-07
Peak spectrum fit
Power-law model
Time interval is from 0.144 sec. to 1.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37635 ( -0.115461 0.11616 )
Norm@50keV : 3.09788E-02 ( -0.00221572 0.00221192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.46 using 59 PHA bins.
# Reduced chi-squared = 0.9730 for 57 degrees of freedom
# Null hypothesis probability = 5.329920e-01
Photon flux (15-150 keV) in 1 sec: 3.75289 ( -0.269189 0.269369 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00821e-07 ( -2.37976e-08 2.39184e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.144 sec. to 1.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.675985 ( -0.534857 0.477417 )
Epeak [keV] : 98.5256 ( -22.8079 94.3467 )
Norm@50keV : 6.84911E-02 ( -0.0280512 0.0547201 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.89 using 59 PHA bins.
# Reduced chi-squared = 0.8730 for 56 degrees of freedom
# Null hypothesis probability = 7.386649e-01
Photon flux (15-150 keV) in 1 sec: 3.66969 ( -0.27551 0.27542 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90179e-07 ( -2.5254e-08 2.5282e-08 ) ergs/cm2
Band function
Time interval is from 0.144 sec. to 1.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.676183 ( -0.462913 0.564951 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 98.5261 ( -18.8882 94.3081 )
Norm@50keV : 6.84733E-02 ( -0.0280208 0.0548091 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.89 using 59 PHA bins.
# Reduced chi-squared = 0.8888 for 55 degrees of freedom
# Null hypothesis probability = 7.060256e-01
Photon flux (15-150 keV) in 1 sec: 3.69509 ( ) 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] : 16.5386 (-1.37042 1.51456)
R^2/D10^2 : 0.323792 (-0.0844128 0.111996)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.12 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 57 degrees of freedom
# Null hypothesis probability = 2.793554e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.817e-08 2.480e-09
25- 50 7.861e-08 7.925e-09
50-150 1.521e-07 1.900e-08
15-150 2.489e-07 2.245e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-24.6243 -200)
Norm : 15.5374 (-1.09767 1.09767)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.79 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.458082e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.868e-08 3.095e-09
25- 50 7.441e-08 8.160e-09
50-150 1.632e-07 4.255e-08
15-150 2.763e-07 4.215e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.93433 (-2.02068 2.44596)
R1^2/D10^2 : 3.07712 (-1.82107 7.10483)
kT2 [keV] : 23.8405 (-3.8946 7.00905)
R2^2/D10^2 : 7.53881E-02 (-0.0473688 0.0446315)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.43 using 59 PHA bins.
# Reduced chi-squared = 0.8805 for 55 degrees of freedom
# Null hypothesis probability = 7.221398e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.117e-08 1.320e-08
25- 50 7.386e-08 2.191e-08
50-150 1.839e-07 6.457e-08
15-150 2.890e-07 8.750e-08
Plot creation:
Fri Sep 4 05:35:52 EDT 2020