batgrbproduct analysis for trigger=980421
batgrbproduct Analysis for Trigger=980421
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 Jul 2 15:28:39 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger980421/GCN5_download_cron
======================================================================
Trigger: 00980421 Segment: 000
BAT Trigger Time: 615300444.288 [s; MET]
Trigger Stop: 615300446.336 [s; MET]
UTC: 2020-07-01T12:46:59.079040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 123.554730695954 Dec: -14.4938413543113 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.22
Image Trigger?: NO
Rate S/N Ratio: 9 [ if not an image trigger ]
Image S/N Ratio: 7.22
Flight Position: [ source = BAT ]
RA: 123.554730695954 Dec: -14.4938413543113 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 123.565309697825 Dec: -14.5347552904854 [deg; J2000]
{ 08h 14m 15.7s , -14d 32' 05.1" }
+/- 1.49813283457113 [arcmin] (estimated 90% radius based on SNR)
+/- 0.670762974820772 [arcmin] (formal 1-sigma fit error)
SNR: 17.0738792200002
Angular difference between Flight and Ground position is 2.530575 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 38.7319999933243 +/- 8.57982426625218
Measured from: -5.10799992084503
to: 33.6240000724792 [s; relative to TRIGTIME]
T50: 14.3959999084473 +/- 4.471135902852
Measured from: -0.0559998750686646
to: 14.3400000333786 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -1.72000002861023
to: -0.720000028610229 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.80799996852875
to: 41.9960000514984 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.638145 0.708578 0.313645 0.095917
0.051945 0.053016 0.045087 0.038959 [error]
Peak 0.033945 0.040012 0.015965 0.018723
0.007743 0.007697 0.006855 0.005719 [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 1.87e-07 2.70e-07 2.89e-07 5.75e-07 9.24e-07 1.32e-06 erg/cm2
Error 2.38e-08 2.40e-08 4.31e-08 1.70e-07 9.97e-08 2.16e-07 erg/cm2
Peak flux Power-law 2.60e-01 2.42e-01 1.56e-01 1.54e-01 7.21e-01 8.12e-01 ph/cm2/s
Error 1.01e-01 6.02e-02 5.51e-02 1.13e-01 1.77e-01 2.05e-01 ph/cm2/s
Fluence Cutoff-PL 1.82e-07 2.87e-07 2.78e-07 2.28e-07 8.68e-07 9.74e-07 erg/cm2
Error 2.54e-08 3.44e-08 5.30e-08 2.36e-07 1.26e-07 3.55e-07 erg/cm2
Peak flux Cutoff-PL 2.66e-01 2.42e-01 1.53e-01 1.47e-01 7.22e-01 8.11e-01 ph/cm2/s
Error 1.01e-01 6.03e-02 5.52e-02 1.47e-01 1.77e-01 1.75e-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 1.901 0.164 - - 2.06e-03 2.24e-04 56.600 57
CPL 1.421 0.760 48.1 0.0 3.99e-03 0.00e+00 55.150 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.635 0.456 - - 5.55e-03 1.52e-03 67.420 57
CPL 2.107 0.944 41.8 0.0 3.03e-03 0.00e+00 67.260 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: 16.960000 sec.
T50 in the 50-300 keV band: 8.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 48.804 -6.808 41.996
T90 38.732 -5.108 33.624
T50 14.396 -0.056 14.340
Peak 1.000 -1.720 -0.720
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
123.5653 -14.5348 0.0113 19.6 -65.2 1.7915 17.1 TRIG_00980421
------------------------------------------
Foreground time interval of the image:
-6.808 41.996 (delta_t = 48.804 [sec])
Background time interval of the image:
-239.288 -177.273 (delta_t = 62.015 [sec])
-166.288 -27.108 (delta_t = 139.180 [sec])
-26.288 -6.808 (delta_t = 19.480 [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 -6.808 sec. to 41.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90124 ( -0.160965 0.166432 )
Norm@50keV : 2.05943E-03 ( -0.000226162 0.000222355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 0.9930 for 57 degrees of freedom
# Null hypothesis probability = 4.900445e-01
Photon flux (15-150 keV) in 48.8 sec: 0.295705 ( -0.0263202 0.026324 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.23979e-07 ( -9.88015e-08 1.00669e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.808 sec. to 41.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42137 ( -0.860454 0.660435 )
Epeak [keV] : 48.1003 ( )
Norm@50keV : 3.98804E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.15 using 59 PHA bins.
# Reduced chi-squared = 0.9847 for 56 degrees of freedom
# Null hypothesis probability = 5.072005e-01
Photon flux (15-150 keV) in 48.8 sec: 0.290372 ( -0.027428 0.027322 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.67732e-07 ( -1.25016e-07 1.27129e-07 ) ergs/cm2
Band function
Time interval is from -6.808 sec. to 41.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.49168 ( -5.14907 -4.49168 )
beta : -2.22269 ( -0.2817 0.240548 )
Epeak [keV] : 26.0129 ( -3.32998 3.1636 )
Norm@50keV : 108.777 ( -9.54476 823.72 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.38 using 59 PHA bins.
# Reduced chi-squared = 0.8797 for 55 degrees of freedom
# Null hypothesis probability = 7.236352e-01
Photon flux (15-150 keV) in 48.8 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] : 9.19211 (-0.894021 1.02405)
R^2/D10^2 : 0.191793 (-0.0647156 0.0940796)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.52 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 57 degrees of freedom
# Null hypothesis probability = 8.073647e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.556e-07 2.447e-08
25- 50 3.417e-07 3.755e-08
50-150 1.390e-07 3.616e-08
15-150 6.364e-07 8.125e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 73.3713 (-19.3378 31.4985)
Norm : 1.43313 (-0.195721 0.236599)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 0.9658 for 57 degrees of freedom
# Null hypothesis probability = 5.485663e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.803e-07 2.228e-08
25- 50 2.904e-07 2.594e-08
50-150 3.860e-07 1.012e-07
15-150 8.567e-07 1.071e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.27138 (-1.01806 1.06351)
R1^2/D10^2 : 0.403154 (-0.156072 0.280885)
kT2 [keV] : 36.2359 (-13.7152 59.9188)
R2^2/D10^2 : 8.24039E-04 (-0.00073992 0.00314004)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.26 using 59 PHA bins.
# Reduced chi-squared = 0.8228 for 55 degrees of freedom
# Null hypothesis probability = 8.227235e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.808e-07 4.046e-08
25- 50 3.039e-07 7.330e-08
50-150 4.548e-07 2.378e-07
15-150 9.395e-07 3.185e-07
Peak spectrum fit
Power-law model
Time interval is from -1.720 sec. to -0.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63522 ( -0.454394 0.457278 )
Norm@50keV : 5.55202E-03 ( -0.00154477 0.00148604 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.42 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.626915e-01
Photon flux (15-150 keV) in 1 sec: 0.721464 ( -0.177254 0.17736 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.17143e-08 ( -1.48623e-08 1.55529e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.720 sec. to -0.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10744 ( -1.35402 0.53318 )
Epeak [keV] : 41.8020 ( )
Norm@50keV : 3.03051E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.26 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 56 degrees of freedom
# Null hypothesis probability = 1.440489e-01
Photon flux (15-150 keV) in 1 sec: 0.722218 ( -0.178396 0.17655 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.1793e-08 ( -3.08698e-08 1.49751e-08 ) ergs/cm2
Band function
Time interval is from -1.720 sec. to -0.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97290 ( -5.60582 -4.9729 )
beta : -2.24677 ( -1.97962 0.725115 )
Epeak [keV] : 27.7245 ( -7.79377 6.67449 )
Norm@50keV : 410.798 ( -96.5178 2691.65 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.66 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 55 degrees of freedom
# Null hypothesis probability = 1.979972e-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] : 8.41639 (-1.74667 2.62777)
R^2/D10^2 : 0.666968 (-0.439065 0.997556)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.39 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.256972e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.848e-09 5.430e-09
25- 50 1.688e-08 1.018e-08
50-150 5.224e-09 3.768e-09
15-150 3.095e-08 1.610e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 153.555 (-106.029 -152.343)
Norm : 2.96130 (-0.768571 1.43156)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.99 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 57 degrees of freedom
# Null hypothesis probability = 1.511422e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.590e-09 4.366e-09
25- 50 1.412e-08 8.090e-09
50-150 2.813e-08 1.789e-08
15-150 4.984e-08 2.903e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.34994 (-1.46761 1.80779)
R1^2/D10^2 : 1.02432 (-0.622903 1.4521)
kT2 [keV] : 197.931 (-159.942 -198.145)
R2^2/D10^2 : 1.19985E-04 (-5.93464e-05 0.00241972)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.08 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 55 degrees of freedom
# Null hypothesis probability = 3.287354e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.477e-09 5.715e-09
25- 50 1.531e-08 8.885e-09
50-150 3.423e-08 8.165e-09
15-150 5.901e-08 1.910e-08
Plot creation:
Thu Jul 2 15:31:57 EDT 2020