batgrbproduct analysis for trigger=972011
batgrbproduct Analysis for Trigger=972011
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 v2.47
Process Start Time (local time): Thu May 14 20:43:02 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger972011/GCN5_download_cron
======================================================================
Trigger: 00972011 Segment: 000
BAT Trigger Time: 611069672 [s; MET]
Trigger Stop: 611069736 [s; MET]
UTC: 2020-05-13T13:34:07.066320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.965921549293 Dec: -15.5472855803932 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 15.56
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 15.56
Flight Position: [ source = BAT ]
RA: 244.965921549293 Dec: -15.5472855803932 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.973916590313 Dec: -15.643364991638 [deg; J2000]
{ 16h 19m 53.7s , -15d 38' 36.1" }
+/- 0.688149510708707 [arcmin] (estimated 90% radius based on SNR)
+/- 0.178644752086918 [arcmin] (formal 1-sigma fit error)
SNR: 51.880014229885
Angular difference between Flight and Ground position is 5.783251 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 508.59199988842 +/- 48.5689690168762
Measured from: -20.1239998340607
to: 488.468000054359 [s; relative to TRIGTIME]
T50: 245.963999867439 +/- 80.476074665252
Measured from: 127.728000164032
to: 373.692000031471 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 276.332000017166
to: 277.332000017166 [s; relative to TRIGTIME]
Total Fluence
Measured from: -50.2920000553131
to: 515.919999957085 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 21.502001 1.802179 -0.003856 0.104585
0.156858 0.137406 0.115318 0.098687 [error]
Peak 0.050229 0.014041 0.004130 0.005593
0.006548 0.005722 0.004792 0.004132 [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 6.73e-06 7.63e-07 3.64e-08 1.82e-09 7.53e-06 7.54e-06 erg/cm2
Error 5.25e-07 6.98e-08 9.04e-09 7.81e-10 5.15e-07 5.15e-07 erg/cm2
Peak flux Power-law 4.68e-01 1.05e-01 1.20e-02 1.51e-03 5.87e-01 5.87e-01 ph/cm2/s
Error 1.04e-01 5.36e-02 1.58e-02 3.76e-03 1.38e-01 1.39e-01 ph/cm2/s
Fluence Cutoff-PL 6.40e-06 5.91e-07 6.76e-10 3.95e-16 6.99e-06 6.99e-06 erg/cm2
Error 6.18e-07 8.37e-08 1.58e-09 7.89e-14 6.21e-07 6.21e-07 erg/cm2
Peak flux Cutoff-PL 4.68e-01 1.03e-01 1.15e-02 1.42e-03 5.85e-01 5.86e-01 ph/cm2/s
Error 1.04e-01 8.11e-02 1.58e-02 3.73e-03 1.40e-01 1.39e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 6.388 0.240 - - 7.42e-05 1.50e-05 76.620 57
CPL 1.000 0.000 50.0 0.0 1.21e-03 0.00e+00 782.040 56
The chi2 of BB fit is 55.56 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.133 0.945 - - 8.46e-04 7.85e-04 59.350 57
CPL 1.000 0.000 50.0 0.0 9.18e-03 0.00e+00 88.420 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 566.212 -50.292 515.920
T90 508.592 -20.124 488.468
T50 245.964 127.728 373.692
Peak 1.000 276.332 277.332
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.9739 -15.6434 0.0037 0.1 47.2 25.3527 51.9 TRIG_00972011
------------------------------------------
Foreground time interval of the image:
-17.499 440.580 (delta_t = 458.079 [sec])
442.000 515.920 (delta_t = 73.920 [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
Multiple GTIs in the spectrum
tstart tstop
-50.292000 440.580000
442.000000 515.920000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.38757 ( -0.241074 0.239229 )
Norm@50keV : 7.42403E-05 ( -1.37237e-05 1.62361e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.62 using 59 PHA bins.
# Reduced chi-squared = 1.344 for 57 degrees of freedom
# Null hypothesis probability = 4.256164e-02
Photon flux (15-150 keV) in 564.8 sec: 0.452157 ( -0.0336432 0.0340438 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.535e-06 ( -5.12333e-07 5.17878e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-50.292000 440.580000
442.000000 515.920000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.20872E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 782.04 using 59 PHA bins.
# Reduced chi-squared = 13.965 for 56 degrees of freedom
# Null hypothesis probability = 1.465826e-128
Photon flux (15-150 keV) in 564.8 sec: 0.418370 ( -0.041406 0.040427 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.99285e-06 ( -6.29018e-07 6.13655e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-50.292000 440.580000
442.000000 515.920000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.57887 ( )
beta : -6.43637 ( )
Epeak [keV] : 25.6431 ( )
Norm@50keV : 1.09497E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 699.12 using 59 PHA bins.
# Reduced chi-squared = 12.711 for 55 degrees of freedom
# Null hypothesis probability = 2.021956e-112
Photon flux (15-150 keV) in 564.8 sec: 0.0 ( ) 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] : 2.63390 (-0.112542 0.122407)
R^2/D10^2 : 139.545 (-45.3111 65.4323)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.56 using 59 PHA bins.
# Reduced chi-squared = 0.9747 for 57 degrees of freedom
# Null hypothesis probability = 5.293938e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.264e-06 6.631e-07
25- 50 5.659e-07 6.250e-08
50-150 2.942e-10 1.404e-10
15-150 6.830e-06 5.987e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.44469 (-0.268267 0.302278)
Norm : 155.560 (-43.1105 58.6991)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 0.9798 for 57 degrees of freedom
# Null hypothesis probability = 5.183816e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.548e-06 6.879e-07
25- 50 6.262e-07 7.238e-08
50-150 1.731e-09 7.636e-10
15-150 7.176e-06 6.636e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.70040 (-9.86562 -9.86562)
R1^2/D10^2 : 2.98932E-03 (-0.00298576 185.985)
kT2 [keV] : 2.58648 (-2.58558 0.143482)
R2^2/D10^2 : 159.803 (-58.1045 206.48)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.99 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.34 using 59 PHA bins.
# Reduced chi-squared = 0.9998 for 55 degrees of freedom
# Reduced chi-squared = 0.9879 for 55 degrees of freedom
# Null hypothesis probability = 4.750118e-01
# Null hypothesis probability = 4.999509e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.295e-06 1.520e-04
25- 50 5.884e-07 1.700e-04
50-150 6.272e-10 1.604e-05
15-150 6.884e-06 2.993e-04
Peak spectrum fit
Power-law model
Time interval is from 276.332 sec. to 277.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.13258 ( -0.833747 1.05611 )
Norm@50keV : 8.46440E-04 ( -0.000574036 0.000995417 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.35 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.901055e-01
Photon flux (15-150 keV) in 1 sec: 0.586551 ( -0.137795 0.13875 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05667e-08 ( -5.83854e-09 6.72668e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 276.332 sec. to 277.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 9.18444E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.42 using 59 PHA bins.
# Reduced chi-squared = 1.579 for 56 degrees of freedom
# Null hypothesis probability = 3.724826e-03
Photon flux (15-150 keV) in 1 sec: 0.584616 ( -0.139727 0.140258 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04956e-08 ( -6.2851e-09 6.6079e-09 ) ergs/cm2
Band function
Time interval is from 276.332 sec. to 277.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.53403 ( 1.53405 1.53405 )
beta : -4.74213 ( 4.42278 1.07006 )
Epeak [keV] : 13.3001 ( -6.48832 93.8439 )
Norm@50keV : 4332.76 ( -4754.95 1.77423e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 55 degrees of freedom
# Null hypothesis probability = 3.456536e-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] : 3.17802 (-0.642073 0.831554)
R^2/D10^2 : 56.2162 (-56.2194 175.205)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.65 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.794179e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.490e-08 8.590e-09
25- 50 2.645e-09 1.709e-09
50-150 6.711e-12 7.180e-12
15-150 1.756e-08 1.001e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.28753 (-2.40952 4.40737)
Norm : 41.3464 (-26.4255 89.3035)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.53 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.836054e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.442e-08 8.320e-09
25- 50 3.839e-09 2.449e-09
50-150 9.839e-11 1.042e-10
15-150 1.836e-08 1.077e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.11374 (-0.696327 0.811544)
R1^2/D10^2 : 62.6432 (-62.6432 1224.78)
kT2 [keV] : 56.8656 (-56.8658 -56.8658)
R2^2/D10^2 : 3.13251E-04 (-0.000313248 87.9079)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.24 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.921420e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.480e-08 8.270e-09
25- 50 3.177e-09 1.662e-09
50-150 1.020e-08 6.315e-09
15-150 2.818e-08 1.404e-08
Plot creation:
Thu May 14 20:47:28 EDT 2020