batgrbproduct analysis for trigger=821103
batgrbproduct Analysis for Trigger=821103
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 v2.46
Process Start Time (local time): Tue Apr 3 12:08:39 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger821103/GCN5_download_cron
======================================================================
Trigger: 00821103 Segment: 000
BAT Trigger Time: 544355120 [s; MET]
Trigger Stop: 544355120.256 [s; MET]
UTC: 2018-04-02T09:44:59.279000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.90471404867 Dec: -14.9635136172067 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.19
Image Trigger?: NO
Rate S/N Ratio: 50.5074251966976 [ if not an image trigger ]
Image S/N Ratio: 9.19
Flight Position: [ source = BAT ]
RA: 251.90471404867 Dec: -14.9635136172067 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.923195038879 Dec: -14.9281204792247 [deg; J2000]
{ 16h 47m 41.6s , -14d 55' 41.2" }
+/- 1.95218452606508 [arcmin] (estimated 90% radius based on SNR)
+/- 1.29460816080487 [arcmin] (formal 1-sigma fit error)
SNR: 11.6973792670906
Angular difference between Flight and Ground position is 2.378531 arcmin
Partial Coding Fraction: 0.3789062 [ including projection effects ]
Duration
T90: 0.179999947547913 +/- 0.0312411001733173
Measured from: 0.0680000782012939
to: 0.248000025749207 [s; relative to TRIGTIME]
T50: 0.0999999046325684 +/- 0.0226273785602007
Measured from: 0.120000123977661
to: 0.220000028610229 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.340000033378601
to: 0.659999966621399 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0520000457763672
to: 0.264000058174133 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.028500 0.040180 0.067153 0.034514
0.006277 0.007628 0.008051 0.007692 [error]
Peak 0.042369 0.063696 0.093822 0.025941
0.012298 0.012955 0.011833 0.010834 [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 5.39e-09 1.82e-08 5.10e-08 4.31e-07 1.40e-07 5.06e-07 erg/cm2
Error 2.09e-09 4.08e-09 7.40e-09 1.71e-07 2.16e-08 1.72e-07 erg/cm2
Peak flux Power-law 3.61e-01 5.26e-01 5.73e-01 1.17e+00 1.82e+00 2.63e+00 ph/cm2/s
Error 1.39e-01 1.21e-01 9.50e-02 4.54e-01 3.10e-01 4.74e-01 ph/cm2/s
Fluence Cutoff-PL 5.26e-09 1.84e-08 5.11e-08 3.98e-07 1.40e-07 4.73e-07 erg/cm2
Error 1.66e-09 4.08e-09 7.47e-09 2.21e-07 2.14e-08 2.20e-07 erg/cm2
Peak flux Cutoff-PL 3.62e-01 5.27e-01 5.73e-01 1.16e+00 1.82e+00 2.62e+00 ph/cm2/s
Error 1.59e-01 1.22e-01 1.08e-01 6.23e-01 3.14e-01 6.52e-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 0.515 0.303 - - 4.96e-02 8.29e-03 55.830 57
CPL 0.505 0.565 10000.0 0.0 5.00e-02 7.79e-03 55.860 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.878 0.311 - - 1.58e-02 2.71e-03 69.840 57
CPL 0.874 0.387 9999.4 0.0 1.60e-02 1.77e-02 69.840 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.212 0.052 0.264
T90 0.180 0.068 0.248
T50 0.100 0.120 0.220
Peak 1.000 -0.340 0.660
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.9232 -14.9281 0.0164 31.9 58.4 0.1789 11.7 TRIG_00821103
------------------------------------------
Foreground time interval of the image:
0.052 0.264 (delta_t = 0.212 [sec])
Background time interval of the image:
-239.000 0.052 (delta_t = 239.052 [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
Time interval is from 0.052 sec. to 0.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.514954 ( -0.317013 0.289368 )
Norm@50keV : 4.96048E-02 ( -0.00849695 0.00808591 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 0.9795 for 57 degrees of freedom
# Null hypothesis probability = 5.190716e-01
Photon flux (15-150 keV) in 0.212 sec: 5.86076 ( -0.859217 0.862046 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40228e-07 ( -2.15691e-08 2.1663e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.052 sec. to 0.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.504681 ( -0.728082 0.401123 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 5.00145E-02 ( -0.00852902 0.00705774 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.86 using 59 PHA bins.
# Reduced chi-squared = 0.9975 for 56 degrees of freedom
# Null hypothesis probability = 4.802258e-01
Photon flux (15-150 keV) in 0.212 sec: 5.87295 ( -0.87331 0.85008 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40395e-07 ( -2.16728e-08 2.11642e-08 ) ergs/cm2
Band function
Time interval is from 0.052 sec. to 0.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.968458 ( 0.968338 0.968338 )
beta : -0.514937 ( -0.289398 0.316922 )
Epeak [keV] : 12.9742 ( -12.9755 -12.9755 )
Norm@50keV : 7.33046E-02 ( -0.0314208 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.434608e-01
Photon flux (15-150 keV) in 0.212 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] : 35.2220 (-8.21932 14.1185)
R^2/D10^2 : 5.99092E-02 (-0.0335519 0.0623431)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.32 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.632221e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.222e-09 7.442e-10
25- 50 1.456e-08 4.428e-09
50-150 1.178e-07 3.354e-08
15-150 1.345e-07 4.071e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-30.057 -200)
Norm : 21.3993 (-3.52364 3.52364)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.33 using 59 PHA bins.
# Reduced chi-squared = 1.585 for 57 degrees of freedom
# Null hypothesis probability = 3.248811e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.139e-08 6.541e-09
25- 50 2.191e-08 1.259e-08
50-150 4.806e-08 2.766e-08
15-150 8.137e-08 4.671e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.51012 (-1.88383 8.72271)
R1^2/D10^2 : 62.3859 (-62.1685 11317)
kT2 [keV] : 42.0042 (-11.3784 -42.0027)
R2^2/D10^2 : 3.73131E-02 (-0.032481 0.0462389)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.87 using 59 PHA bins.
# Reduced chi-squared = 0.9976 for 55 degrees of freedom
# Null hypothesis probability = 4.796538e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.894e-09 4.284e-09
25- 50 1.353e-08 5.088e-09
50-150 1.219e-07 5.035e-08
15-150 1.433e-07 6.150e-08
Peak spectrum fit
Power-law model
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.878427 ( -0.323312 0.299556 )
Norm@50keV : 1.58409E-02 ( -0.00274532 0.00267832 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.84 using 59 PHA bins.
# Reduced chi-squared = 1.225 for 57 degrees of freedom
# Null hypothesis probability = 1.181962e-01
Photon flux (15-150 keV) in 1 sec: 1.81803 ( -0.308596 0.311129 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7929e-07 ( -3.03405e-08 3.05334e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.874007 ( -0.474177 0.300227 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.59523E-02 ( -0.00257396 0.0328268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.84 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 56 degrees of freedom
# Null hypothesis probability = 1.010971e-01
Photon flux (15-150 keV) in 1 sec: 1.81829 ( -0.31804 0.30909 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79307e-07 ( -3.1304e-08 3.0481e-08 ) ergs/cm2
Band function
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.790468 ( 0.790468 0.790468 )
beta : -0.878430 ( -0.29929 0.323333 )
Epeak [keV] : 21.8237 ( -21.8237 -21.8237 )
Norm@50keV : 2.34303E-02 ( -0.0103204 398697 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.84 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 55 degrees of freedom
# Null hypothesis probability = 8.581459e-02
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] : 26.5635 (-5.7175 8.63891)
R^2/D10^2 : 3.69506E-02 (-0.0205513 0.040576)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.97 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 57 degrees of freedom
# Null hypothesis probability = 4.727150e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.382e-09 1.579e-09
25- 50 2.561e-08 8.375e-09
50-150 1.325e-07 4.595e-08
15-150 1.625e-07 4.497e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-39.8794 -200)
Norm : 7.54428 (-1.28935 1.28935)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.02 using 59 PHA bins.
# Reduced chi-squared = 1.474 for 57 degrees of freedom
# Null hypothesis probability = 1.145630e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.878e-08 1.078e-08
25- 50 3.614e-08 2.077e-08
50-150 7.925e-08 4.416e-08
15-150 1.342e-07 7.675e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.78281 (-3.34531 5.28943)
R1^2/D10^2 : 1.38334 (-1.2417 20.2481)
kT2 [keV] : 36.1753 (-10.7928 55.7658)
R2^2/D10^2 : 1.38072E-02 (-0.0121682 0.0262712)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.11 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 55 degrees of freedom
# Null hypothesis probability = 9.551812e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.238e-08 7.430e-09
25- 50 2.926e-08 1.556e-08
50-150 1.407e-07 7.735e-08
15-150 1.823e-07 9.535e-08
Plot creation:
Tue Apr 3 12:14:06 EDT 2018