batgrbproduct analysis for trigger=813721
batgrbproduct Analysis for Trigger=813721
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): Mon Mar 12 03:48:17 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger813721/batgroup_hand_proc
======================================================================
Trigger: 00813721 Segment: 000
BAT Trigger Time: 542484249.856 [s; MET]
Trigger Stop: 542484258.048 [s; MET]
UTC: 2018-03-11T18:03:49.248040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 3.43345521460187 Dec: -54.4789735818177 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.58
Image Trigger?: NO
Rate S/N Ratio: 10 [ if not an image trigger ]
Image S/N Ratio: 8.58
Flight Position: [ source = BAT ]
RA: 3.43345521460187 Dec: -54.4789735818177 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 3.37934331062735 Dec: -54.4907346705799 [deg; J2000]
{ 00h 13m 31.0s , -54d 29' 26.6" }
+/- 2.29200675215556 [arcmin] (estimated 90% radius based on SNR)
+/- 0.829827612774513 [arcmin] (formal 1-sigma fit error)
SNR: 9.30088442031222
Angular difference between Flight and Ground position is 2.013763 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 23.039999961853 +/- 8.71246656581249
Measured from: 0.720000028610229
to: 23.7599999904633 [s; relative to TRIGTIME]
T50: 8.6399998664856 +/- 8.98761462925503
Measured from: 3.34400010108948
to: 11.9839999675751 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.87600004673004
to: 3.87600004673004 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.239999890327454
to: 26.5760000944138 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.232061 0.227337 0.108858 0.041243
0.033005 0.034387 0.030431 0.027897 [error]
Peak 0.014623 0.036197 0.010613 0.003063
0.006502 0.006893 0.006189 0.005498 [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 6.01e-08 9.31e-08 1.08e-07 2.43e-07 3.33e-07 5.05e-07 erg/cm2
Error 1.38e-08 1.52e-08 2.84e-08 1.27e-07 6.70e-08 1.57e-07 erg/cm2
Peak flux Power-law 1.91e-01 1.92e-01 1.36e-01 1.54e-01 5.80e-01 6.73e-01 ph/cm2/s
Error 8.16e-02 5.40e-02 4.86e-02 1.11e-01 1.58e-01 1.90e-01 ph/cm2/s
Fluence Cutoff-PL 5.61e-08 1.06e-07 1.02e-07 4.84e-08 2.97e-07 3.12e-07 erg/cm2
Error 1.53e-08 2.20e-08 3.57e-08 1.75e-07 7.41e-08 1.78e-07 erg/cm2
Peak flux Cutoff-PL 1.63e-01 2.34e-01 1.29e-01 2.11e-02 5.44e-01 5.47e-01 ph/cm2/s
Error 1.31e-01 9.02e-02 -------- 1.30e-01 1.72e-01 2.26e-01 ph/cm2/s
Fluence Band 5.53e-08 1.07e-07 9.83e-08 1.13e-07 3.05e-07 3.73e-07 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 1.781 0.287 - - 1.35e-03 2.63e-04 65.740 57
CPL 0.767 1.465 49.6 -17.4 5.32e-03 2.63e-02 63.740 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.497 0.460 - - 4.65e-03 1.33e-03 58.460 57
CPL -0.076 3.853 55.2 0.0 3.72e-02 0.00e+00 57.640 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 26.816 -0.240 26.576
T90 23.040 0.720 23.760
T50 8.640 3.344 11.984
Peak 1.000 2.876 3.876
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
3.3793 -54.4907 0.0207 22.4434 -24.8268 0.6360123 9.301 TRIG_00813721
Foreground time interval of the image:
-0.240 26.576 (delta_t = 26.816 [sec])
Background time interval of the image:
-120.755 -0.240 (delta_t = 120.515 [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 -0.240 sec. to 26.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78120 ( -0.278611 0.295251 )
Norm@50keV : 1.34819E-03 ( -0.000266005 0.000259217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.74 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 1.998164e-01
Photon flux (15-150 keV) in 26.82 sec: 0.184440 ( -0.0300858 0.0300861 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33129e-07 ( -6.57836e-08 6.82105e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.240 sec. to 26.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.767140 ( -1.67488 1.25599 )
Epeak [keV] : 49.6336 ( -14.8131 -49.6336 )
Norm@50keV : 5.32049E-03 ( -0.0053205 0.0471836 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.74 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 56 degrees of freedom
# Null hypothesis probability = 2.228788e-01
Photon flux (15-150 keV) in 26.82 sec: 0.178508 ( -0.030627 0.030844 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97203e-07 ( -6.87381e-08 7.94221e-08 ) ergs/cm2
Band function
Time interval is from -0.240 sec. to 26.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -0.279168 -5 )
beta : -2.01029 ( -0.429388 0.352168 )
Epeak [keV] : 23.7414 ( -5.49652 4.68997 )
Norm@50keV : 274.648 ( -43.9386 1198.52 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.79 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 55 degrees of freedom
# Null hypothesis probability = 2.465199e-01
Photon flux (15-150 keV) in 26.82 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05327e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8326 (-1.8652 2.27877)
R^2/D10^2 : 6.66429E-02 (-0.0339844 0.0676963)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.32 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.448456e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.368e-08 1.255e-08
25- 50 1.211e-07 2.956e-08
50-150 7.931e-08 3.488e-08
15-150 2.441e-07 5.619e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 90.6640 (-38.4911 -90.664)
Norm : 0.843998 (-0.173145 0.232107)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.16 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.399565e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.908e-08 1.365e-08
25- 50 1.001e-07 2.960e-08
50-150 1.531e-07 1.016e-07
15-150 3.122e-07 1.141e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.93699 (-2.08635 -4.96537)
R1^2/D10^2 : 0.641309 (-0.550262 1.49995)
kT2 [keV] : 15.3540 (-4.39353 -15.3758)
R2^2/D10^2 : 1.43888E-02 (-0.014243 0.043284)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.22 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Null hypothesis probability = 2.088030e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.872e-08 3.169e-08
25- 50 1.021e-07 5.392e-08
50-150 1.257e-07 7.377e-08
15-150 2.866e-07 1.475e-07
Peak spectrum fit
Power-law model
Time interval is from 2.876 sec. to 3.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49676 ( -0.456278 0.464579 )
Norm@50keV : 4.64930E-03 ( -0.00134404 0.001316 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.46 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.214304e-01
Photon flux (15-150 keV) in 1 sec: 0.579915 ( -0.157591 0.157729 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.41287e-08 ( -1.36233e-08 1.41606e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.876 sec. to 3.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.64609E-02 ( -5.70204 2.00457 )
Epeak [keV] : 55.2324 ( )
Norm@50keV : 3.71818E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.64 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 56 degrees of freedom
# Null hypothesis probability = 4.144198e-01
Photon flux (15-150 keV) in 1 sec: 0.543593 ( -0.169648 0.173525 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59541e-08 ( -1.35842e-08 1.99336e-08 ) ergs/cm2
Band function
Time interval is from 2.876 sec. to 3.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.162962 ( -0.837273 -0.837273 )
beta : -2.05203 ( 2.32643 1.10807 )
Epeak [keV] : 49.7699 ( -44.9421 181.816 )
Norm@50keV : 4.47850E-02 ( -0.185866 90.4979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.010837e-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] : 12.1720 (-2.91337 4.32354)
R^2/D10^2 : 0.143878 (-0.0966576 0.242324)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.415761e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.513e-09 2.537e-09
25- 50 1.444e-08 7.967e-09
50-150 1.299e-08 8.136e-09
15-150 3.194e-08 1.970e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.140 (-137.711 -199.156)
Norm : 2.38333 (-0.641691 0.850113)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.16 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.325061e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.936e-09 3.602e-09
25- 50 1.142e-08 6.680e-09
50-150 2.503e-08 1.492e-08
15-150 4.238e-08 2.496e-08
Double BB
R1^2/D10^2 : 0.226629 (-0.147855 0.264329)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 6.47820E-05 (-3.23687e-05 0.142048)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.42 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.21 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.19 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.588712e-01
# Null hypothesis probability = 4.668715e-01
# Null hypothesis probability = 4.673730e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.144e-09 3.085e-09
25- 50 1.388e-08 8.685e-09
50-150 2.526e-08 1.161e-08
15-150 4.429e-08 2.176e-08
Plot creation:
Mon Mar 12 04:05:17 EDT 2018