batgrbproduct analysis for trigger=866993
batgrbproduct Analysis for Trigger=866993
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 Oct 15 08:18:15 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger866993/GCN5_download_cron
======================================================================
Trigger: 00866993 Segment: 000
BAT Trigger Time: 561197756.668 [s; MET]
Trigger Stop: 561197756.732 [s; MET]
UTC: 2018-10-14T08:15:34.916700 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 272.166007718439 Dec: -20.380370164253 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.92
Image Trigger?: NO
Rate S/N Ratio: 18.3847763108502 [ if not an image trigger ]
Image S/N Ratio: 6.92
Flight Position: [ source = BAT ]
RA: 272.166007718439 Dec: -20.380370164253 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.153116847413 Dec: -20.4069110844602 [deg; J2000]
{ 18h 08m 36.7s , -20d 24' 24.9" }
+/- 1.5533874228864 [arcmin] (estimated 90% radius based on SNR)
+/- 0.569575055151348 [arcmin] (formal 1-sigma fit error)
SNR: 16.2129313929944
Angular difference between Flight and Ground position is 1.749714 arcmin
Partial Coding Fraction: 0.3125 [ including projection effects ]
Duration
T90: 1.90400004386902 +/- 0.365557208133314
Measured from: -0.0679998397827148
to: 1.8360002040863 [s; relative to TRIGTIME]
T50: 0.927999973297119 +/- 0.192665487917238
Measured from: 0.124000191688538
to: 1.05200016498566 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.175999999046326
to: 0.824000000953674 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.195999979972839
to: 2.0440000295639 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.316368 0.329771 0.078690 0.016439
0.025073 0.024657 0.017661 0.013318 [error]
Peak 0.232020 0.210452 0.043677 0.003027
0.018905 0.018104 0.012434 0.009066 [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 1.13e-07 1.22e-07 9.36e-08 1.17e-07 3.73e-07 4.46e-07 erg/cm2
Error 1.34e-08 1.19e-08 1.56e-08 3.59e-08 3.94e-08 5.94e-08 erg/cm2
Peak flux Power-law 2.65e+00 1.45e+00 4.96e-01 2.21e-01 4.71e+00 4.82e+00 ph/cm2/s
Error 3.43e-01 1.58e-01 9.48e-02 7.43e-02 4.95e-01 5.03e-01 ph/cm2/s
Fluence Cutoff-PL 1.00e-07 1.62e-07 6.37e-08 3.27e-09 3.29e-07 3.29e-07 erg/cm2
Error 1.53e-08 1.82e-08 2.14e-08 5.73e-09 3.54e-08 3.56e-08 erg/cm2
Peak flux Cutoff-PL 2.33e+00 1.86e+00 3.90e-01 1.36e-02 4.60e+00 4.60e+00 ph/cm2/s
Error 3.95e-01 2.37e-01 1.29e-01 2.37e-02 4.96e-01 4.96e-01 ph/cm2/s
Fluence Band 9.93e-08 1.61e-07 6.42e-08 8.76e-09 3.32e-07 3.34e-07 erg/cm2
Error 1.51e-08 -------- -------- 3.37e-08 -------- -------- 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 2.382 0.163 - - 1.71e-02 2.16e-03 86.170 57
CPL -0.387 1.162 31.3 3.8 9.29e-01 3.00e+00 60.250 56
The chi2 of BB fit is 63.19 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 2.546 0.188 - - 2.33e-02 3.49e-03 54.280 57
CPL 0.133 1.210 28.2 5.9 7.59e-01 2.68e+00 36.550 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 2.240 -0.196 2.044
T90 1.904 -0.068 1.836
T50 0.928 0.124 1.052
Peak 1.000 -0.176 0.824
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.1531 -20.4069 0.0119 36.6 -60.8 0.7659 16.2 TRIG_00866993
------------------------------------------
Foreground time interval of the image:
-0.196 2.044 (delta_t = 2.240 [sec])
Background time interval of the image:
-239.668 -0.196 (delta_t = 239.472 [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 -0.196 sec. to 2.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.38209 ( -0.158589 0.167244 )
Norm@50keV : 1.71310E-02 ( -0.00216982 0.00214851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.17 using 59 PHA bins.
# Reduced chi-squared = 1.512 for 57 degrees of freedom
# Null hypothesis probability = 7.567251e-03
Photon flux (15-150 keV) in 2.24 sec: 3.13678 ( -0.297336 0.297455 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7281e-07 ( -3.92152e-08 3.96646e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.196 sec. to 2.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.387176 ( -1.26664 1.05666 )
Epeak [keV] : 31.2631 ( -4.10263 3.4319 )
Norm@50keV : 0.928690 ( -0.930257 5.07134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.25 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 56 degrees of freedom
# Null hypothesis probability = 3.246521e-01
Photon flux (15-150 keV) in 2.24 sec: 3.03461 ( -0.29635 0.29702 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.28646e-07 ( -3.45856e-08 3.62477e-08 ) ergs/cm2
Band function
Time interval is from -0.196 sec. to 2.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.411705 ( -1.30104 -0.624053 )
beta : -5.12406 ( 4.5413 1.63186 )
Epeak [keV] : 31.2037 ( -5.18993 3.53577 )
Norm@50keV : 0.969199 ( -0.9692 1075.07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.08 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.969954e-01
Photon flux (15-150 keV) in 2.24 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32297e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.27677 (-0.697291 0.745539)
R^2/D10^2 : 3.23368 (-0.974959 1.41311)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.670307e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.192e-08 1.401e-08
25- 50 1.705e-07 1.876e-08
50-150 5.001e-08 1.308e-08
15-150 3.124e-07 3.282e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.4599 (-6.21855 7.98716)
Norm : 22.4463 (-3.56994 4.23234)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.19 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 57 degrees of freedom
# Null hypothesis probability = 1.473000e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.117e-07 1.267e-08
25- 50 1.409e-07 1.427e-08
50-150 9.819e-08 2.788e-08
15-150 3.507e-07 3.707e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.54381 (-2.78768 -5.54381)
R1^2/D10^2 : 7.62755 (-6.26656 54.7558)
kT2 [keV] : 10.5837 (-5.14042 -10.5837)
R2^2/D10^2 : 0.771287 (-0.767796 1.36789)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.70 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 55 degrees of freedom
# Null hypothesis probability = 3.089436e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.018e-07 5.570e-08
25- 50 1.593e-07 8.396e-08
50-150 6.950e-08 3.931e-08
15-150 3.306e-07 1.717e-07
Peak spectrum fit
Power-law model
Time interval is from -0.176 sec. to 0.824 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.54630 ( -0.18133 0.195131 )
Norm@50keV : 2.33215E-02 ( -0.00350575 0.00346993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.28 using 59 PHA bins.
# Reduced chi-squared = 0.9522 for 57 degrees of freedom
# Null hypothesis probability = 5.778820e-01
Photon flux (15-150 keV) in 1 sec: 4.71450 ( -0.494591 0.49474 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36232e-07 ( -2.75116e-08 2.78662e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.176 sec. to 0.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.132582 ( -1.3316 1.08921 )
Epeak [keV] : 28.1658 ( -7.36923 4.41173 )
Norm@50keV : 0.759023 ( -0.758722 4.61059 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.55 using 59 PHA bins.
# Reduced chi-squared = 0.6528 for 56 degrees of freedom
# Null hypothesis probability = 9.794379e-01
Photon flux (15-150 keV) in 1 sec: 4.59946 ( -0.49575 0.4961 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15886e-07 ( -2.4967e-08 2.6082e-08 ) ergs/cm2
Band function
Time interval is from -0.176 sec. to 0.824 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.151426 ( -1.06583 1.42493 )
beta : -6.10128 ( 6.04445 2.73595 )
Epeak [keV] : 28.1034 ( -7.21397 3.83726 )
Norm@50keV : 0.739694 ( -0.236454 5.71524 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.53 using 59 PHA bins.
# Reduced chi-squared = 0.6642 for 55 degrees of freedom
# Null hypothesis probability = 9.740203e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27936e-07 ( -2.27929e-07 -2.8371e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.92086 (-0.773755 0.821536)
R^2/D10^2 : 5.67390 (-1.92574 3.03135)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.18 using 59 PHA bins.
# Reduced chi-squared = 0.7224 for 57 degrees of freedom
# Null hypothesis probability = 9.432492e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.389e-08 1.027e-08
25- 50 1.099e-07 1.457e-08
50-150 2.793e-08 8.910e-09
15-150 2.017e-07 2.700e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.6605 (-5.72114 7.27042)
Norm : 37.4811 (-6.80224 8.43822)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.95 using 59 PHA bins.
# Reduced chi-squared = 0.7009 for 57 degrees of freedom
# Null hypothesis probability = 9.579152e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.833e-08 1.002e-08
25- 50 9.215e-08 1.207e-08
50-150 5.410e-08 1.763e-08
15-150 2.246e-07 2.765e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.12414 (-1.82479 2.22055)
R1^2/D10^2 : 35.1612 (-28.2929 468.549)
kT2 [keV] : 9.63616 (-1.59868 4.8472)
R2^2/D10^2 : 1.96491 (-1.81828 3.08748)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.80 using 59 PHA bins.
# Reduced chi-squared = 0.6509 for 55 degrees of freedom
# Null hypothesis probability = 9.791021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.366e-08 3.805e-08
25- 50 1.010e-07 5.280e-08
50-150 4.067e-08 2.428e-08
15-150 2.153e-07 1.088e-07
Plot creation:
Mon Oct 15 08:22:12 EDT 2018