batgrbproduct analysis for trigger=987016
batgrbproduct Analysis for Trigger=987016
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): Fri Aug 7 15:55:20 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger987016/GCN5_download_cron
======================================================================
Trigger: 00987016 Segment: 000
BAT Trigger Time: 618420555.328 [s; MET]
Trigger Stop: 618420555.84 [s; MET]
UTC: 2020-08-06T15:28:49.915180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 52.9051939418572 Dec: 37.0819682887688 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.05
Image Trigger?: NO
Rate S/N Ratio: 24.576411454889 [ if not an image trigger ]
Image S/N Ratio: 11.05
Flight Position: [ source = BAT ]
RA: 52.9051939418572 Dec: 37.0819682887688 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 52.9322784346353 Dec: 37.0761000477783 [deg; J2000]
{ 03h 31m 43.7s , +37d 04' 34.0" }
+/- 0.765239717161303 [arcmin] (estimated 90% radius based on SNR)
+/- 0.267510778358939 [arcmin] (formal 1-sigma fit error)
SNR: 44.5781404118772
Angular difference between Flight and Ground position is 1.343448 arcmin
Partial Coding Fraction: 0.578125 [ including projection effects ]
Duration
T90: 38.9199999570847 +/- 1.07465331014928
Measured from: 3.35600018501282
to: 42.2760001420975 [s; relative to TRIGTIME]
T50: 14.5800000429153 +/- 0.356740810112865
Measured from: 18.5640001296997
to: 33.1440001726151 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 22.2440000772476
to: 23.2440000772476 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.131999969482422
to: 61.2240000963211 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.357781 7.949730 7.987927 2.227801
0.062519 0.072551 0.070577 0.053798 [error]
Peak 0.240578 0.523423 0.708440 0.284734
0.011722 0.015530 0.017737 0.013052 [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 1.70e-06 3.60e-06 5.99e-06 2.26e-05 1.65e-05 3.39e-05 erg/cm2
Error 5.44e-08 6.96e-08 8.89e-08 7.67e-07 2.35e-07 7.90e-07 erg/cm2
Peak flux Power-law 2.55e+00 3.94e+00 4.56e+00 1.02e+01 1.40e+01 2.12e+01 ph/cm2/s
Error 1.71e-01 1.62e-01 1.39e-01 6.71e-01 4.33e-01 7.28e-01 ph/cm2/s
Fluence Cutoff-PL 1.42e-06 3.63e-06 6.40e-06 1.34e-05 1.63e-05 2.49e-05 erg/cm2
Error 7.28e-08 7.35e-08 1.22e-07 1.34e-06 2.41e-07 1.34e-06 erg/cm2
Peak flux Cutoff-PL 2.30e+00 3.97e+00 4.78e+00 7.60e+00 1.39e+01 1.86e+01 ph/cm2/s
Error 2.26e-01 1.69e-01 1.93e-01 1.38e+00 4.39e-01 1.43e+00 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 1.266 0.025 - - 2.70e-02 4.06e-04 112.430 57
CPL 0.716 0.116 147.9 18.5 4.46e-02 4.62e-03 40.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.788 0.052 - - 1.22e-01 3.85e-03 46.790 57
CPL 0.453 0.217 291.6 226.2 1.67e-01 3.33e-02 39.310 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: 35.008000 sec.
T50 in the 50-300 keV band: 14.592000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 61.356 -0.132 61.224
T90 38.920 3.356 42.276
T50 14.580 18.564 33.144
Peak 1.000 22.244 23.244
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
52.9323 +37.0761 0.0044 38.5 -24.8 2.6095 44.6 TRIG_00987016
------------------------------------------
Foreground time interval of the image:
-0.132 8.973 (delta_t = 9.105 [sec])
Background time interval of the image:
-239.328 -30.998 (delta_t = 208.330 [sec])
-29.328 -16.248 (delta_t = 13.080 [sec])
-15.328 -0.132 (delta_t = 15.196 [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 -0.132 sec. to 61.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26593 ( -0.0254022 0.0253155 )
Norm@50keV : 2.69644E-02 ( -0.000406666 0.000406079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 112.43 using 59 PHA bins.
# Reduced chi-squared = 1.9724 for 57 degrees of freedom
# Null hypothesis probability = 1.689785e-05
Photon flux (15-150 keV) in 61.36 sec: 3.19761 ( -0.0543376 0.0544541 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.649e-05 ( -2.34962e-07 2.34971e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.132 sec. to 61.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.716300 ( -0.117123 0.114486 )
Epeak [keV] : 147.943 ( -15.031 22.0464 )
Norm@50keV : 4.46439E-02 ( -0.00434278 0.00490627 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.21 using 59 PHA bins.
# Reduced chi-squared = 0.7180 for 56 degrees of freedom
# Null hypothesis probability = 9.448643e-01
Photon flux (15-150 keV) in 61.36 sec: 3.07745 ( -0.05782 0.05814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.628e-05 ( -2.41206e-07 2.40961e-07 ) ergs/cm2
Band function
Time interval is from -0.132 sec. to 61.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.716264 ( -0.0893991 0.124062 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 147.918 ( -8.13479 22.0358 )
Norm@50keV : 4.46435E-02 ( -0.00434367 0.00490791 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.21 using 59 PHA bins.
# Reduced chi-squared = 0.7310 for 55 degrees of freedom
# Null hypothesis probability = 9.327331e-01
Photon flux (15-150 keV) in 61.36 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] : 21.5496 ( )
R^2/D10^2 : 0.113720 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 661.45 using 59 PHA bins.
# Reduced chi-squared = 11.604 for 57 degrees of freedom
# Null hypothesis probability = 8.552163e-104
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.053e-07 1.896e-08
25- 50 3.161e-06 7.302e-08
50-150 1.096e-05 2.148e-07
15-150 1.473e-05 2.240e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 14.1566 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 564.67 using 59 PHA bins.
# Reduced chi-squared = 9.9064 for 57 degrees of freedom
# Null hypothesis probability = 1.163459e-84
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.163e-06 3.590e-08
25- 50 4.161e-06 6.780e-08
50-150 9.125e-06 1.565e-07
15-150 1.545e-05 2.516e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.67384 (-0.697545 0.731467)
R1^2/D10^2 : 0.854192 (-0.159977 0.212361)
kT2 [keV] : 32.5621 (-1.85659 2.28801)
R2^2/D10^2 : 2.28451E-02 (-0.00501436 0.00556221)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.16 using 59 PHA bins.
# Reduced chi-squared = 0.8029 for 55 degrees of freedom
# Null hypothesis probability = 8.521946e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.208e-06 7.148e-08
25- 50 3.746e-06 1.089e-07
50-150 1.126e-05 3.099e-07
15-150 1.622e-05 4.541e-07
Peak spectrum fit
Power-law model
Time interval is from 22.244 sec. to 23.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.788023 ( -0.0522596 0.0517593 )
Norm@50keV : 0.122170 ( -0.00385649 0.00384352 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.79 using 59 PHA bins.
# Reduced chi-squared = 0.8209 for 57 degrees of freedom
# Null hypothesis probability = 8.306593e-01
Photon flux (15-150 keV) in 1 sec: 14.0477 ( -0.4331 0.433402 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43491e-06 ( -4.53103e-08 4.53376e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 22.244 sec. to 23.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.453106 ( -0.222513 0.211584 )
Epeak [keV] : 291.589 ( -90.3599 361.986 )
Norm@50keV : 0.167172 ( -0.0294076 0.0372541 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.31 using 59 PHA bins.
# Reduced chi-squared = 0.7019 for 56 degrees of freedom
# Null hypothesis probability = 9.557765e-01
Photon flux (15-150 keV) in 1 sec: 13.9188 ( -0.4392 0.4396 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42921e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 22.244 sec. to 23.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.854896 ( 0.854901 0.854901 )
beta : -0.788029 ( -0.0517266 0.0523065 )
Epeak [keV] : 15.5843 ( -15.5843 -15.5843 )
Norm@50keV : 0.175273 ( -0.0368579 2.89898e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.79 using 59 PHA bins.
# Reduced chi-squared = 0.8507 for 55 degrees of freedom
# Null hypothesis probability = 7.767187e-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] : 26.7204 ( )
R^2/D10^2 : 0.300617 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 161.39 using 59 PHA bins.
# Reduced chi-squared = 2.8314 for 57 degrees of freedom
# Null hypothesis probability = 6.480512e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.595e-08 2.165e-09
25- 50 2.107e-07 1.010e-08
50-150 1.102e-06 4.650e-08
15-150 1.349e-06 4.350e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 54.8684 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 610.74 using 59 PHA bins.
# Reduced chi-squared = 10.715 for 57 degrees of freedom
# Null hypothesis probability = 9.879470e-94
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.366e-07 4.950e-09
25- 50 2.628e-07 9.400e-09
50-150 5.764e-07 1.850e-08
15-150 9.759e-07 3.345e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.1225 (-1.75446 2.08673)
R1^2/D10^2 : 2.46161 (-0.915308 1.7088)
kT2 [keV] : 40.7242 (-5.02247 8.64053)
R2^2/D10^2 : 7.51794E-02 (-0.032874 0.0382159)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.11 using 59 PHA bins.
# Reduced chi-squared = 0.7293 for 55 degrees of freedom
# Null hypothesis probability = 9.341557e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.746e-08 8.500e-09
25- 50 2.393e-07 2.540e-08
50-150 1.134e-06 1.374e-07
15-150 1.441e-06 1.585e-07
Plot creation:
Fri Aug 7 15:58:43 EDT 2020