batgrbproduct analysis for trigger=977310
batgrbproduct Analysis for Trigger=977310
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): Sat Jun 13 20:09:17 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger977310/GCN5_download_cron
======================================================================
Trigger: 00977310 Segment: 000
BAT Trigger Time: 613629602.24 [s; MET]
Trigger Stop: 613629604.288 [s; MET]
UTC: 2020-06-12T04:39:37.140020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 302.681184324407 Dec: -45.3569592690613 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.04
Image Trigger?: NO
Rate S/N Ratio: 10.0995049383621 [ if not an image trigger ]
Image S/N Ratio: 8.04
Flight Position: [ source = BAT ]
RA: 302.681184324407 Dec: -45.3569592690613 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 302.695629381764 Dec: -45.3501272229642 [deg; J2000]
{ 20h 10m 47.0s , -45d 21' 00.5" }
+/- 1.26478180919107 [arcmin] (estimated 90% radius based on SNR)
+/- 0.444902499156139 [arcmin] (formal 1-sigma fit error)
SNR: 21.746120652714
Angular difference between Flight and Ground position is 0.734159 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 424.635999917984 +/- 9.07222305126204
Measured from: -1.5919998884201
to: 423.044000029564 [s; relative to TRIGTIME]
T50: 263.939999938011 +/- 122.588915001396
Measured from: 24.0040000677109
to: 287.944000005722 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.03199994564056
to: 5.03199994564056 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.1879999637604
to: 429.819999933243 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.217682 2.978109 2.631060 0.636856
0.133756 0.136953 0.123569 0.119513 [error]
Peak 0.017548 0.038745 0.030024 0.014243
0.006664 0.007058 0.006474 0.006095 [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 6.15e-07 1.24e-06 1.95e-06 6.80e-06 5.44e-06 1.06e-05 erg/cm2
Error 5.74e-08 6.73e-08 1.23e-07 9.70e-07 3.01e-07 1.05e-06 erg/cm2
Peak flux Power-law 1.99e-01 2.30e-01 1.92e-01 2.70e-01 7.18e-01 8.91e-01 ph/cm2/s
Error 7.79e-02 5.54e-02 5.19e-02 1.56e-01 1.57e-01 2.11e-01 ph/cm2/s
Fluence Cutoff-PL 5.70e-07 1.28e-06 2.00e-06 4.07e-06 5.28e-06 7.91e-06 erg/cm2
Error 7.20e-08 7.67e-08 1.35e-07 1.53e-06 3.41e-07 2.05e-06 erg/cm2
Peak flux Cutoff-PL 1.87e-01 2.37e-01 1.97e-01 1.88e-01 7.09e-01 8.09e-01 ph/cm2/s
Error 8.79e-02 6.26e-02 5.75e-02 1.74e-01 1.62e-01 2.56e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.88e-01 2.36e-01 1.97e-01 1.95e-01 7.10e-01 8.16e-01 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 1.346 0.091 - - 1.29e-03 6.35e-05 55.650 57
CPL 0.984 0.375 147.9 1060.2 1.92e-03 7.99e-04 52.680 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.263 0.389 - - 6.06e-03 1.33e-03 49.110 57
CPL 0.961 1.658 176.3 0.0 8.54e-03 2.19e-02 48.940 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: 114.240000 sec.
T50 in the 50-300 keV band: 40.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 441.008 -11.188 429.820
T90 424.636 -1.592 423.044
T50 263.940 24.004 287.944
Peak 1.000 4.032 5.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
302.6956 -45.3501 0.0089 15.6 33.2 1.7295 21.7 TRIG_00977310
------------------------------------------
Foreground time interval of the image:
-11.188 22.661 (delta_t = 33.849 [sec])
Background time interval of the image:
-235.139 -234.010 (delta_t = 1.129 [sec])
-233.240 -231.120 (delta_t = 2.120 [sec])
-229.240 -229.020 (delta_t = 0.220 [sec])
-222.240 -220.810 (delta_t = 1.430 [sec])
-219.240 -218.896 (delta_t = 0.344 [sec])
-217.240 -217.232 (delta_t = 0.008 [sec])
-216.240 -215.350 (delta_t = 0.890 [sec])
-211.240 -211.216 (delta_t = 0.024 [sec])
-210.240 -209.930 (delta_t = 0.310 [sec])
-208.240 -208.100 (delta_t = 0.140 [sec])
-206.240 -203.970 (delta_t = 2.270 [sec])
-203.240 -201.930 (delta_t = 1.310 [sec])
-200.240 -197.880 (delta_t = 2.360 [sec])
-197.240 -192.060 (delta_t = 5.180 [sec])
-189.240 -188.550 (delta_t = 0.690 [sec])
-186.240 -185.990 (delta_t = 0.250 [sec])
-184.240 -11.188 (delta_t = 173.052 [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
-11.188000 75.190000
76.760000 141.730000
142.760000 288.970000
289.760000 292.450000
294.760000 294.850000
295.760000 296.300000
298.760000 299.030000
300.760000 429.820000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34631 ( -0.0914167 0.0913745 )
Norm@50keV : 1.29288E-03 ( -6.35691e-05 6.34985e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 0.9763 for 57 degrees of freedom
# Null hypothesis probability = 5.257944e-01
Photon flux (15-150 keV) in 430.2 sec: 0.155637 ( -0.00785476 0.00786758 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43678e-06 ( -3.0029e-07 3.02131e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-11.188000 75.190000
76.760000 141.730000
142.760000 288.970000
289.760000 292.450000
294.760000 294.850000
295.760000 296.300000
298.760000 299.030000
300.760000 429.820000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.984218 ( -0.392524 0.35714 )
Epeak [keV] : 147.888 ( -51.0042 2069.37 )
Norm@50keV : 1.92324E-03 ( -0.000600113 0.000997517 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.68 using 59 PHA bins.
# Reduced chi-squared = 0.9408 for 56 degrees of freedom
# Null hypothesis probability = 6.012457e-01
Photon flux (15-150 keV) in 430.2 sec: 0.152142 ( -0.008571 0.008551 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.2798e-06 ( -3.40934e-07 3.40503e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-11.188000 75.190000
76.760000 141.730000
142.760000 288.970000
289.760000 292.450000
294.760000 294.850000
295.760000 296.300000
298.760000 299.030000
300.760000 429.820000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.984200 ( -0.321863 0.575758 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 147.860 ( -32.1125 2138.33 )
Norm@50keV : 1.92313E-03 ( -0.000600309 0.000997589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.68 using 59 PHA bins.
# Reduced chi-squared = 0.9579 for 55 degrees of freedom
# Null hypothesis probability = 5.636937e-01
Photon flux (15-150 keV) in 430.2 sec: 0.153178 ( ) 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] : 17.2146 ( )
R^2/D10^2 : 1.11459E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 116.58 using 59 PHA bins.
# Reduced chi-squared = 2.0453 for 57 degrees of freedom
# Null hypothesis probability = 5.574793e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.884e-07 2.803e-08
25- 50 1.289e-06 9.744e-08
50-150 2.737e-06 2.588e-07
15-150 4.314e-06 2.697e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.5298 -200)
Norm : 0.643134 (-0.0315612 0.0315612)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.74 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 57 degrees of freedom
# Null hypothesis probability = 1.560621e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.891e-07 3.700e-08
25- 50 1.326e-06 8.131e-08
50-150 2.907e-06 2.039e-07
15-150 4.922e-06 3.270e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.40411 (-1.1073 1.50091)
R1^2/D10^2 : 0.317681 (-0.188809 0.511894)
kT2 [keV] : 22.8415 (-2.41511 3.50159)
R2^2/D10^2 : 3.82877E-03 (-0.0015442 0.00188291)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.99 using 59 PHA bins.
# Reduced chi-squared = 0.9453 for 55 degrees of freedom
# Null hypothesis probability = 5.902630e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.054e-07 1.983e-07
25- 50 1.198e-06 1.800e-07
50-150 3.312e-06 4.160e-07
15-150 5.116e-06 6.844e-07
Peak spectrum fit
Power-law model
Time interval is from 4.032 sec. to 5.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26293 ( -0.391128 0.387594 )
Norm@50keV : 6.06145E-03 ( -0.00133591 0.00132849 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.11 using 59 PHA bins.
# Reduced chi-squared = 0.8616 for 57 degrees of freedom
# Null hypothesis probability = 7.619805e-01
Photon flux (15-150 keV) in 1 sec: 0.718439 ( -0.157302 0.157592 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.04586e-08 ( -1.50967e-08 1.55326e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.032 sec. to 5.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.961457 ( -1.58518 1.73173 )
Epeak [keV] : 176.346 ( -174.971 -174.971 )
Norm@50keV : 8.53725E-03 ( -0.0038178 0.0399127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.94 using 59 PHA bins.
# Reduced chi-squared = 0.8739 for 56 degrees of freedom
# Null hypothesis probability = 7.368661e-01
Photon flux (15-150 keV) in 1 sec: 0.708841 ( -0.162069 0.161943 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.90243e-08 ( -1.63272e-08 1.64816e-08 ) ergs/cm2
Band function
Time interval is from 4.032 sec. to 5.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.953983 ( -0.667258 1.43865 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 174.195 ( -112.567 -174.195 )
Norm@50keV : 8.61932E-03 ( -0.00383163 0.0399261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.94 using 59 PHA bins.
# Reduced chi-squared = 0.8898 for 55 degrees of freedom
# Null hypothesis probability = 7.041518e-01
Photon flux (15-150 keV) in 1 sec: 0.709748 ( ) 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] : 18.1703 (-5.396 7.63145)
R^2/D10^2 : 4.40765E-02 (-0.0294202 0.0969982)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
# Reduced chi-squared = 0.9484 for 57 degrees of freedom
# Null hypothesis probability = 5.860811e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.905e-09 1.513e-09
25- 50 1.353e-08 5.582e-09
50-150 3.250e-08 1.638e-08
15-150 4.893e-08 2.340e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-91.5043 -199.363)
Norm : 2.93257 (-0.643697 0.643697)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.8845 for 57 degrees of freedom
# Null hypothesis probability = 7.187807e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.302e-09 4.428e-09
25- 50 1.405e-08 8.340e-09
50-150 3.081e-08 1.801e-08
15-150 5.216e-08 3.064e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.82307 (-2.90353 4.59218)
R1^2/D10^2 : 0.732790 (-0.602323 4.56652)
kT2 [keV] : 29.7166 (-11.0272 46.1082)
R2^2/D10^2 : 7.50487E-03 (-0.0068163 0.0270413)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.53 using 59 PHA bins.
# Reduced chi-squared = 0.8642 for 55 degrees of freedom
# Null hypothesis probability = 7.526061e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.376e-09 3.609e-09
25- 50 1.335e-08 7.300e-09
50-150 4.117e-08 2.394e-08
15-150 6.090e-08 3.281e-08
Plot creation:
Sat Jun 13 20:14:54 EDT 2020