batgrbproduct analysis for trigger=963260
batgrbproduct Analysis for Trigger=963260
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Wed Mar 25 12:28:20 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger963260/GCN5_download_cron
======================================================================
Trigger: 00963260 Segment: 000
BAT Trigger Time: 606760772.608 [s; MET]
Trigger Stop: 606760776.704 [s; MET]
UTC: 2020-03-24T16:39:07.954400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 222.685467928864 Dec: 35.9684973487692 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.81
Image Trigger?: NO
Rate S/N Ratio: 9.8488578017961 [ if not an image trigger ]
Image S/N Ratio: 9.81
Flight Position: [ source = BAT ]
RA: 222.685467928864 Dec: 35.9684973487692 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 222.682226870643 Dec: 35.9308195350745 [deg; J2000]
{ 14h 50m 43.7s , +35d 55' 51.0" }
+/- 1.06226372045613 [arcmin] (estimated 90% radius based on SNR)
+/- 0.315347905013189 [arcmin] (formal 1-sigma fit error)
SNR: 27.9025307449652
Angular difference between Flight and Ground position is 2.266143 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 127.743999958038 +/- 43.0813183773842
Measured from: -28.7919999361038
to: 98.9520000219345 [s; relative to TRIGTIME]
T50: 44.095999956131 +/- 20.7906440440316
Measured from: -5.49599993228912
to: 38.6000000238419 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0719999074935913
to: 1.07199990749359 [s; relative to TRIGTIME]
Total Fluence
Measured from: -38.1360000371933
to: 140.487999916077 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.362410 1.675012 0.884404 0.244747
0.136543 0.144645 0.129302 0.113408 [error]
Peak 0.035940 0.034584 0.021153 0.006089
0.006492 0.006821 0.005987 0.004881 [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 3.89e-07 6.26e-07 7.63e-07 1.83e-06 2.30e-06 3.60e-06 erg/cm2
Error 4.92e-08 5.19e-08 9.66e-08 4.71e-07 2.27e-07 5.63e-07 erg/cm2
Peak flux Power-law 2.91e-01 2.51e-01 1.49e-01 1.32e-01 7.48e-01 8.23e-01 ph/cm2/s
Error 9.55e-02 5.29e-02 5.13e-02 9.22e-02 1.57e-01 1.80e-01 ph/cm2/s
Fluence Cutoff-PL 3.66e-07 6.68e-07 7.63e-07 7.69e-07 2.17e-06 2.56e-06 erg/cm2
Error 5.51e-08 6.84e-08 1.06e-07 7.94e-07 2.57e-07 8.38e-07 erg/cm2
Peak flux Cutoff-PL 2.93e-01 2.51e-01 1.47e-01 1.28e-01 7.48e-01 8.20e-01 ph/cm2/s
Error 9.44e-02 5.31e-02 5.13e-02 1.21e-01 1.57e-01 1.82e-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 1.715 0.148 - - 1.79e-03 1.68e-04 69.650 57
CPL 1.183 0.608 68.7 -25.1 3.53e-03 3.12e-03 67.040 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.759 0.427 - - 5.51e-03 1.42e-03 55.230 57
CPL 2.572 0.772 191.1 0.0 2.14e-03 0.00e+00 54.060 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: 73.728000 sec.
T50 in the 50-300 keV band: 26.752000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 178.624 -38.136 140.488
T90 127.744 -28.792 98.952
T50 44.096 -5.496 38.600
Peak 1.000 0.072 1.072
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
222.6822 35.9308 0.0069 18.7238 8.9286 3.0417965 27.903 TRIG_00963260
Foreground time interval of the image:
-38.136 29.193 (delta_t = 67.329 [sec])
Background time interval of the image:
-239.608 -38.136 (delta_t = 201.472 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -38.136 sec. to 100.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71546 ( -0.14626 0.149974 )
Norm@50keV : 1.79423E-03 ( -0.000168654 0.000166443 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.65 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 57 degrees of freedom
# Null hypothesis probability = 1.213594e-01
Photon flux (15-150 keV) in 138.5 sec: 0.239605 ( -0.019943 0.01995 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29848e-06 ( -2.24902e-07 2.28317e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -38.136 sec. to 100.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18326 ( -0.652428 0.563152 )
Epeak [keV] : 68.6808 ( -18.473 -68.6808 )
Norm@50keV : 3.52631E-03 ( -0.00176381 0.00447414 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.04 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 56 degrees of freedom
# Null hypothesis probability = 1.482329e-01
Photon flux (15-150 keV) in 138.5 sec: 0.234430 ( -0.020678 0.020669 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17831e-06 ( -2.54293e-07 2.59607e-07 ) ergs/cm2
Band function
Time interval is from -38.136 sec. to 100.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 11.8695 (-1.2381 1.4084)
R^2/D10^2 : 6.02250E-02 (-0.0202201 0.0300929)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.28 using 59 PHA bins.
# Reduced chi-squared = 1.689 for 57 degrees of freedom
# Null hypothesis probability = 8.879712e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.483e-07 3.622e-08
25- 50 7.714e-07 8.968e-08
50-150 6.487e-07 1.394e-07
15-150 1.668e-06 1.773e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 117.092 (-33.7993 61.7717)
Norm : 1.02796 (-0.105618 0.124891)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.09 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.695986e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.712e-07 4.231e-08
25- 50 6.612e-07 7.583e-08
50-150 1.166e-06 4.291e-07
15-150 2.198e-06 5.401e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.23209 (-1.41591 1.68782)
R1^2/D10^2 : 0.411358 (-0.22338 0.614732)
kT2 [keV] : 21.3914 (-4.61877 8.96033)
R2^2/D10^2 : 5.25423E-03 (-0.00384291 0.0064209)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.29 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 55 degrees of freedom
# Null hypothesis probability = 1.614338e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.723e-07 1.358e-07
25- 50 6.597e-07 2.301e-07
50-150 1.144e-06 6.116e-07
15-150 2.176e-06 8.155e-07
Peak spectrum fit
Power-law model
Time interval is from 0.072 sec. to 1.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75856 ( -0.407872 0.446578 )
Norm@50keV : 5.51197E-03 ( -0.00147109 0.00137347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.23 using 59 PHA bins.
# Reduced chi-squared = 0.9689 for 57 degrees of freedom
# Null hypothesis probability = 5.418985e-01
Photon flux (15-150 keV) in 1 sec: 0.747712 ( -0.157324 0.157333 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0844e-08 ( -1.33976e-08 1.38956e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.072 sec. to 1.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.57158 ( -1.34363 0.20056 )
Epeak [keV] : 191.101 ( )
Norm@50keV : 2.14212E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
# Reduced chi-squared = 0.9653 for 56 degrees of freedom
# Null hypothesis probability = 5.487300e-01
Photon flux (15-150 keV) in 1 sec: 0.533560 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.92555e-08 ( -1.60986e-08 1.36962e-08 ) ergs/cm2
Band function
Time interval is from 0.072 sec. to 1.072 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 9.61223 (-2.57195 4.19367)
R^2/D10^2 : 0.388448 (-0.283358 0.864744)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.29 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.109591e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.203e-09 3.339e-09
25- 50 1.692e-08 7.479e-09
50-150 7.864e-09 4.560e-09
15-150 3.198e-08 1.250e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 124.833 (-75.9495 -124.711)
Norm : 3.13400 (-0.7527 1.27917)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.58 using 59 PHA bins.
# Reduced chi-squared = 0.9926 for 57 degrees of freedom
# Null hypothesis probability = 4.907898e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.149e-09 4.662e-09
25- 50 1.468e-08 8.190e-09
50-150 2.670e-08 1.768e-08
15-150 4.952e-08 3.041e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.74513 (-2.66644 2.87314)
R1^2/D10^2 : 1.26399 (-0.993501 6.94146)
kT2 [keV] : 54.8173 (-40.7261 -60.5388)
R2^2/D10^2 : 1.04701E-03 (-0.00071993 0.0210232)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9870 for 55 degrees of freedom
# Null hypothesis probability = 5.018209e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.195e-09 5.450e-09
25- 50 1.365e-08 7.430e-09
50-150 3.298e-08 1.980e-08
15-150 5.583e-08 3.059e-08
Plot creation:
Wed Mar 25 15:13:24 EDT 2020