batgrbproduct analysis for trigger=994856
batgrbproduct Analysis for Trigger=994856
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): Mon Sep 7 20:54:19 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger994856/GCN5_download_cron
======================================================================
Trigger: 00994856 Segment: 000
BAT Trigger Time: 621090689.664 [s; MET]
Trigger Stop: 621090691.712 [s; MET]
UTC: 2020-09-06T13:11:04.076080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.292956564777 Dec: 67.852260484626 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.66
Image Trigger?: NO
Rate S/N Ratio: 12.328828005938 [ if not an image trigger ]
Image S/N Ratio: 8.66
Flight Position: [ source = BAT ]
RA: 272.292956564777 Dec: 67.852260484626 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.287715303284 Dec: 67.8844148716056 [deg; J2000]
{ 18h 09m 09.1s , +67d 53' 03.9" }
+/- 1.47816636577275 [arcmin] (estimated 90% radius based on SNR)
+/- 0.768681405782134 [arcmin] (formal 1-sigma fit error)
SNR: 17.4042975618058
Angular difference between Flight and Ground position is 1.932897 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 71.0839999914169 +/- 8.29835466081923
Measured from: -0.199999928474426
to: 70.8840000629425 [s; relative to TRIGTIME]
T50: 33.2999999523163 +/- 8.19363751623628
Measured from: 24.5560001134872
to: 57.8560000658035 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 50.9639999866486
to: 51.9639999866486 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.7039999961853
to: 90.0119999647141 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.182687 2.104857 1.080272 0.192418
0.066273 0.069086 0.061948 0.060334 [error]
Peak 0.104667 0.119791 0.080895 0.010653
0.007960 0.008768 0.007599 0.006383 [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 6.11e-07 8.32e-07 8.36e-07 1.52e-06 2.77e-06 3.80e-06 erg/cm2
Error 4.40e-08 3.54e-08 6.12e-08 2.35e-07 1.34e-07 2.87e-07 erg/cm2
Peak flux Power-law 9.62e-01 8.31e-01 4.91e-01 4.36e-01 2.47e+00 2.72e+00 ph/cm2/s
Error 1.23e-01 6.82e-02 6.23e-02 1.09e-01 2.03e-01 2.27e-01 ph/cm2/s
Fluence Cutoff-PL 5.96e-07 8.45e-07 8.32e-07 1.11e-06 2.71e-06 3.38e-06 erg/cm2
Error 5.25e-08 4.31e-08 6.35e-08 4.96e-07 1.71e-07 5.30e-07 erg/cm2
Peak flux Cutoff-PL 9.20e-01 8.58e-01 4.99e-01 2.99e-01 2.44e+00 2.58e+00 ph/cm2/s
Error 1.43e-01 8.29e-02 6.63e-02 1.86e-01 2.10e-01 2.96e-01 ph/cm2/s
Fluence Band 5.84e-07 8.46e-07 8.20e-07 1.39e-06 2.72e-06 3.64e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 9.01e-01 8.61e-01 5.05e-01 2.82e-01 2.42e+00 2.55e+00 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 1.994 0.091 - - 3.08e-03 1.57e-04 63.320 57
CPL 1.818 0.354 46.3 -0.8 3.84e-03 1.71e-03 62.570 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.758 0.154 - - 1.82e-02 1.73e-03 56.090 57
CPL 1.456 0.444 84.7 -26.5 2.64e-02 1.82e-02 55.160 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: 74.432000 sec.
T50 in the 50-300 keV band: 32.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 98.716 -8.704 90.012
T90 71.084 -0.200 70.884
T50 33.300 24.556 57.856
Peak 1.000 50.964 51.964
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.2877 +67.8844 0.0111 8.4 111.9 1.5356 17.4 TRIG_00994856
------------------------------------------
Foreground time interval of the image:
-8.704 10.966 (delta_t = 19.670 [sec])
12.336 27.737 (delta_t = 15.401 [sec])
Background time interval of the image:
-239.664 -54.915 (delta_t = 184.749 [sec])
-53.664 -8.704 (delta_t = 44.960 [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
Multiple GTIs in the spectrum
tstart tstop
-8.704000 10.966000
12.336000 90.012000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99352 ( -0.0903725 0.0920344 )
Norm@50keV : 3.08474E-03 ( -0.000157695 0.000156129 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.32 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.631705e-01
Photon flux (15-150 keV) in 97.35 sec: 0.461338 ( -0.0204771 0.0205633 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.7684e-06 ( -1.33623e-07 1.34832e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-8.704000 10.966000
12.336000 90.012000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81804 ( -0.370026 0.338605 )
Epeak [keV] : 46.2847 ( -44.6981 -46.2847 )
Norm@50keV : 3.83585E-03 ( -0.00123294 0.00218796 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.57 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 56 degrees of freedom
# Null hypothesis probability = 2.545260e-01
Photon flux (15-150 keV) in 97.35 sec: 0.455210 ( -0.023464 0.023443 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71236e-06 ( -1.71706e-07 1.71034e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-8.704000 10.966000
12.336000 90.012000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.81804 ( 1.87964 0.436362 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 46.2764 ( -27.7192 -46.2764 )
Norm@50keV : 3.83490E-03 ( -0.00152051 0.000786804 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.57 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 55 degrees of freedom
# Null hypothesis probability = 2.254918e-01
Photon flux (15-150 keV) in 97.35 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72023e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.6463 ( )
R^2/D10^2 : 0.156836 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 175.12 using 59 PHA bins.
# Reduced chi-squared = 3.0722 for 57 degrees of freedom
# Null hypothesis probability = 6.155000e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.590e-07 2.765e-08
25- 50 9.725e-07 4.240e-08
50-150 6.068e-07 7.165e-08
15-150 1.938e-06 9.346e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 72.6164 (-10.4191 13.3475)
Norm : 2.17194 (-0.165033 0.184509)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.47 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 57 degrees of freedom
# Null hypothesis probability = 1.615871e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.445e-07 3.699e-08
25- 50 8.747e-07 3.991e-08
50-150 1.154e-06 1.382e-07
15-150 2.573e-06 1.382e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.98107 (-0.86169 0.8874)
R1^2/D10^2 : 1.05119 (-0.414339 0.861181)
kT2 [keV] : 21.0230 (-3.32723 4.83859)
R2^2/D10^2 : 8.70964E-03 (-0.00474313 0.00865732)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.92 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 55 degrees of freedom
# Null hypothesis probability = 1.300702e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.550e-07 8.635e-08
25- 50 8.435e-07 1.193e-07
50-150 1.242e-06 3.054e-07
15-150 2.641e-06 3.670e-07
Peak spectrum fit
Power-law model
Time interval is from 50.964 sec. to 51.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75830 ( -0.150841 0.15639 )
Norm@50keV : 1.82281E-02 ( -0.0017473 0.00171649 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.09 using 59 PHA bins.
# Reduced chi-squared = 0.9841 for 57 degrees of freedom
# Null hypothesis probability = 5.090318e-01
Photon flux (15-150 keV) in 1 sec: 2.47233 ( -0.202501 0.202558 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68121e-07 ( -1.65814e-08 1.68219e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 50.964 sec. to 51.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45647 ( -0.590087 0.297484 )
Epeak [keV] : 84.7178 ( -31.7196 -84.72 )
Norm@50keV : 2.63814E-02 ( -0.0095422 0.0269569 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.16 using 59 PHA bins.
# Reduced chi-squared = 0.9850 for 56 degrees of freedom
# Null hypothesis probability = 5.066623e-01
Photon flux (15-150 keV) in 1 sec: 2.43933 ( -0.21014 0.21008 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64057e-07 ( -1.7964e-08 1.8255e-08 ) ergs/cm2
Band function
Time interval is from 50.964 sec. to 51.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45744 ( -0.481047 0.484542 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 84.9300 ( -31.9248 -84.93 )
Norm@50keV : 2.63373E-02 ( -0.00950509 0.0270018 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.16 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.685931e-01
Photon flux (15-150 keV) in 1 sec: 2.42431 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63906e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.6766 (-1.40784 1.58116)
R^2/D10^2 : 0.482125 (-0.164865 0.254057)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.01 using 59 PHA bins.
# Reduced chi-squared = 1.684 for 57 degrees of freedom
# Null hypothesis probability = 9.428683e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.643e-08 2.725e-09
25- 50 5.505e-08 5.740e-09
50-150 5.509e-08 9.960e-09
15-150 1.266e-07 1.290e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 119.761 (-35.5509 57.6392)
Norm : 10.4083 (-1.03917 1.32104)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.59 using 59 PHA bins.
# Reduced chi-squared = 0.9753 for 57 degrees of freedom
# Null hypothesis probability = 5.280293e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.711e-08 3.235e-09
25- 50 4.849e-08 5.860e-09
50-150 8.645e-08 3.253e-08
15-150 1.620e-07 3.835e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.69164 (-1.09457 1.32728)
R1^2/D10^2 : 12.8036 (-8.12272 30.2688)
kT2 [keV] : 19.6617 (-3.05583 4.20843)
R2^2/D10^2 : 8.28676E-02 (-0.0431239 0.0743903)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.97 using 59 PHA bins.
# Reduced chi-squared = 0.9268 for 55 degrees of freedom
# Null hypothesis probability = 6.291794e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.019e-08 1.365e-08
25- 50 4.395e-08 1.227e-08
50-150 8.791e-08 2.370e-08
15-150 1.620e-07 4.595e-08
Plot creation:
Mon Sep 7 20:58:20 EDT 2020