batgrbproduct analysis for trigger=819490
batgrbproduct Analysis for Trigger=819490
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): Fri Mar 30 15:06:40 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger819490/GCN5_download_cron
======================================================================
Trigger: 00819490 Segment: 000
BAT Trigger Time: 544025324.672 [s; MET]
Trigger Stop: 544025328.768 [s; MET]
UTC: 2018-03-29T14:08:23.970920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 82.9163701340642 Dec: -23.7077603611066 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.87
Image Trigger?: NO
Rate S/N Ratio: 10.9087121146357 [ if not an image trigger ]
Image S/N Ratio: 6.87
Flight Position: [ source = BAT ]
RA: 82.9163701340642 Dec: -23.7077603611066 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 82.9052036904247 Dec: -23.6943984683235 [deg; J2000]
{ 05h 31m 37.2s , -23d 41' 39.8" }
+/- 1.76607137231023 [arcmin] (estimated 90% radius based on SNR)
+/- 0.822117806864619 [arcmin] (formal 1-sigma fit error)
SNR: 13.4973792329682
Angular difference between Flight and Ground position is 1.009504 arcmin
Partial Coding Fraction: 0.15625 [ including projection effects ]
Duration
T90: 210.016000032425 +/- 44.0459433119658
Measured from: -5.5919998884201
to: 204.424000144005 [s; relative to TRIGTIME]
T50: 144.112000107765 +/- 3.39531909749345
Measured from: 4.48800003528595
to: 148.600000143051 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.56399989128113
to: 2.56399989128113 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.91200006008148
to: 230.391999959946 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.011801 2.478984 1.479789 -0.014779
0.141293 0.146319 0.124791 0.105255 [error]
Peak 0.063054 0.051291 0.061942 0.014494
0.016552 0.017990 0.015675 0.011477 [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 7.34e-07 1.04e-06 1.09e-06 2.12e-06 3.54e-06 4.99e-06 erg/cm2
Error 7.68e-08 7.29e-08 1.19e-07 4.61e-07 2.80e-07 5.83e-07 erg/cm2
Peak flux Power-law 6.05e-01 4.78e-01 2.54e-01 1.96e-01 1.43e+00 1.53e+00 ph/cm2/s
Error 2.54e-01 1.43e-01 1.24e-01 1.85e-01 4.25e-01 4.67e-01 ph/cm2/s
Fluence Cutoff-PL 6.52e-07 1.16e-06 1.10e-06 5.93e-07 3.30e-06 3.50e-06 erg/cm2
Error 8.94e-08 9.64e-08 1.37e-07 4.05e-07 2.99e-07 5.00e-07 erg/cm2
Peak flux Cutoff-PL 6.09e-01 4.77e-01 2.51e-01 1.89e-01 1.43e+00 1.53e+00 ph/cm2/s
Error 2.61e-01 1.57e-01 1.28e-01 2.13e-01 4.25e-01 4.59e-01 ph/cm2/s
Fluence Band 6.47e-07 1.15e-06 1.10e-06 5.98e-07 3.30e-06 3.50e-06 erg/cm2
Error 7.50e-08 9.38e-08 1.24e-07 3.71e-07 2.88e-07 4.79e-07 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 1.928 0.125 - - 1.60e-03 1.29e-04 65.320 57
CPL 0.968 0.559 48.6 9.1 5.32e-03 4.14e-03 54.640 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.912 0.579 - - 9.88e-03 3.74e-03 58.830 57
CPL 1.881 1.263 178.7 0.0 1.03e-02 0.00e+00 58.840 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: 158.784000 sec.
T50 in the 50-300 keV band: 80.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 240.304 -9.912 230.392
T90 210.016 -5.592 204.424
T50 144.112 4.488 148.600
Peak 1.000 1.564 2.564
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
82.9052 -23.6944 0.0142 38.5 -104.8 3.0178 13.5 TRIG_00819490
------------------------------------------
Foreground time interval of the image:
-9.912 33.729 (delta_t = 43.641 [sec])
Background time interval of the image:
-239.672 -9.912 (delta_t = 229.760 [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 -9.912 sec. to 230.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92798 ( -0.122704 0.126398 )
Norm@50keV : 1.59943E-03 ( -0.000129676 0.000128222 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.32 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.100535e-01
Photon flux (15-150 keV) in 240.3 sec: 0.232311 ( -0.016583 0.0166001 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.53501e-06 ( -2.79185e-07 2.81615e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.912 sec. to 230.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.967802 ( -0.593165 0.525651 )
Epeak [keV] : 48.5800 ( -7.4033 10.861 )
Norm@50keV : 5.32301E-03 ( -0.00252408 0.00576407 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.64 using 59 PHA bins.
# Reduced chi-squared = 0.9758 for 56 degrees of freedom
# Null hypothesis probability = 5.263217e-01
Photon flux (15-150 keV) in 240.3 sec: 0.223287 ( -0.017202 0.017231 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29793e-06 ( -2.95353e-07 3.03114e-07 ) ergs/cm2
Band function
Time interval is from -9.912 sec. to 230.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.967738 ( -0.360594 0.860337 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 48.5700 ( -7.39787 9.01752 )
Norm@50keV : 5.32320E-03 ( -0.00252592 0.00576921 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.64 using 59 PHA bins.
# Reduced chi-squared = 0.9935 for 55 degrees of freedom
# Null hypothesis probability = 4.881804e-01
Photon flux (15-150 keV) in 240.3 sec: 0.275333 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29723e-06 ( -3.29555e-06 -2.96362e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.5380 (-0.938818 1.0127)
R^2/D10^2 : 6.37783E-02 (-0.0174853 0.0242057)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.64 using 59 PHA bins.
# Reduced chi-squared = 1.538 for 57 degrees of freedom
# Null hypothesis probability = 5.637853e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.297e-07 5.359e-08
25- 50 1.290e-06 1.033e-07
50-150 1.005e-06 1.683e-07
15-150 2.725e-06 2.223e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.8232 (-15.0319 21.2176)
Norm : 1.10440 (-0.115456 0.130892)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.77 using 59 PHA bins.
# Reduced chi-squared = 0.9785 for 57 degrees of freedom
# Null hypothesis probability = 5.211412e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.874e-07 7.089e-08
25- 50 1.124e-06 7.750e-08
50-150 1.557e-06 2.661e-07
15-150 3.368e-06 2.968e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.33629 (-1.158 1.37872)
R1^2/D10^2 : 0.676351 (-0.380276 1.11951)
kT2 [keV] : 16.8528 (-2.38358 3.44891)
R2^2/D10^2 : 1.18019E-02 (-0.00657703 0.0109112)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.72 using 59 PHA bins.
# Reduced chi-squared = 0.9404 for 55 degrees of freedom
# Null hypothesis probability = 6.007550e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.737e-07 2.860e-07
25- 50 1.112e-06 3.035e-07
50-150 1.482e-06 5.240e-07
15-150 3.268e-06 8.283e-07
Peak spectrum fit
Power-law model
Time interval is from 1.564 sec. to 2.564 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91192 ( -0.521714 0.636554 )
Norm@50keV : 9.88406E-03 ( -0.00392951 0.00355758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.83 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 57 degrees of freedom
# Null hypothesis probability = 4.082175e-01
Photon flux (15-150 keV) in 1 sec: 1.42570 ( -0.425219 0.425213 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.08828e-08 ( -3.28923e-08 3.38107e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.564 sec. to 2.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88062 ( -1.73035 0.796313 )
Epeak [keV] : 178.654 ( )
Norm@50keV : 1.02519E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.84 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 56 degrees of freedom
# Null hypothesis probability = 3.719973e-01
Photon flux (15-150 keV) in 1 sec: 1.42562 ( -0.4251 0.42507 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.10036e-08 ( -3.32654e-08 1.75394e-08 ) ergs/cm2
Band function
Time interval is from 1.564 sec. to 2.564 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.21967 ( 2.21967 2.21967 )
beta : -1.91193 ( -0.636541 0.521701 )
Epeak [keV] : 67.8869 ( -67.8869 -67.8869 )
Norm@50keV : 1.34337 ( -0.534374 0.483539 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.83 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 55 degrees of freedom
# Null hypothesis probability = 3.370608e-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] : 7.40382 (-2.84768 14.843)
R^2/D10^2 : 1.96947 (-1.90379 12.0213)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.973409e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.831e-08 1.107e-08
25- 50 2.790e-08 1.716e-08
50-150 5.639e-09 4.806e-09
15-150 5.185e-08 3.354e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 92.4336 (-58.9174 -92.4336)
Norm : 6.43174 (-2.2821 4.1158)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.35 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.898550e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.679e-08 1.034e-08
25- 50 2.857e-08 1.789e-08
50-150 4.422e-08 3.577e-08
15-150 8.958e-08 6.410e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.63936 (-2.14319 2.59506)
R1^2/D10^2 : 10.0652 (-8.5037 21.595)
kT2 [keV] : 22.7548 (-8.8095 25.5181)
R2^2/D10^2 : 2.60374E-02 (-0.0233966 0.0537989)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.08 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.977163e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.042e-08 1.212e-08
25- 50 2.295e-08 1.199e-08
50-150 5.151e-08 3.425e-08
15-150 9.488e-08 5.240e-08
Plot creation:
Fri Mar 30 15:13:54 EDT 2018