batgrbproduct analysis for trigger=811686
batgrbproduct Analysis for Trigger=811686
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 Feb 26 19:25:24 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger811686/GCN5_download_cron
======================================================================
Trigger: 00811686 Segment: 000
BAT Trigger Time: 541283472 [s; MET]
Trigger Stop: 541283536 [s; MET]
UTC: 2018-02-25T20:30:51.464500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 185.608944295945 Dec: 29.2927479190389 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.2
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.2
Flight Position: [ source = BAT ]
RA: 185.608944295945 Dec: 29.2927479190389 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 185.668803559162 Dec: 29.2449910595698 [deg; J2000]
{ 12h 22m 40.5s , +29d 14' 42.0" }
+/- 4.47260202332856 [arcmin] (estimated 90% radius based on SNR)
+/- 2.62851684733529 [arcmin] (formal 1-sigma fit error)
SNR: 3.57887546007248
Angular difference between Flight and Ground position is 4.245765 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.186317 0.226338 0.052098 -0.079199
0.057590 0.060429 0.055006 0.055272 [error]
Peak 0.186317 0.226338 0.052098 -0.079199
0.057590 0.060429 0.055006 0.055272 [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 5.87e-08 6.77e-08 5.62e-08 7.82e-08 2.11e-07 2.60e-07 erg/cm2
Error 2.51e-08 2.81e-08 3.76e-08 1.19e-07 1.00e-07 1.72e-07 erg/cm2
Peak flux Power-law 3.01e-02 1.93e-02 7.99e-03 4.50e-03 5.96e-02 6.18e-02 ph/cm2/s
Error 1.30e-02 7.78e-03 5.55e-03 6.38e-03 2.23e-02 2.38e-02 ph/cm2/s
Fluence Cutoff-PL 6.60e-08 8.02e-08 1.97e-09 1.57e-14 1.48e-07 1.48e-07 erg/cm2
Error 2.41e-08 6.38e-08 2.52e-08 4.06e-09 6.25e-08 6.26e-08 erg/cm2
Peak flux Cutoff-PL 3.21e-02 2.48e-02 3.63e-04 1.87e-09 5.72e-02 5.72e-02 ph/cm2/s
Error 1.57e-02 1.88e-02 3.80e-03 3.19e-04 2.01e-02 2.01e-02 ph/cm2/s
Fluence Band 6.48e-08 8.44e-08 1.77e-08 3.63e-09 1.71e-07 1.71e-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 2.279 0.699 - - 3.45e-04 1.89e-04 42.250 57
CPL -6.266 0.500 26.3 5.5 5.68e+02 3.01e+05 37.620 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.279 0.699 - - 3.45e-04 1.89e-04 42.250 57
CPL -6.266 0.500 26.3 5.5 5.68e+02 3.01e+05 37.620 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
185.6688 +29.2450 0.0536 31.5 12.1 0.4285 3.6 TRIG_00811686
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27854 ( -0.617875 0.780252 )
Norm@50keV : 3.44919E-04 ( -0.000184583 0.000194369 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.25 using 59 PHA bins.
# Reduced chi-squared = 0.7412 for 57 degrees of freedom
# Null hypothesis probability = 9.276778e-01
Photon flux (15-150 keV) in 64 sec: 5.96063E-02 ( -0.0221942 0.0224607 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10902e-07 ( -9.33645e-08 1.07283e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.26579 ( 6.31616 7.31554 )
Epeak [keV] : 26.2987 ( -4.82518 6.15316 )
Norm@50keV : 568.399 ( -716.505 601723 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.62 using 59 PHA bins.
# Reduced chi-squared = 0.6718 for 56 degrees of freedom
# Null hypothesis probability = 9.718946e-01
Photon flux (15-150 keV) in 64 sec: 5.72348E-02 ( -0.0198773 0.0203917 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48276e-07 ( -5.56403e-08 6.92685e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96903 ( -0.0758632 -4.96903 )
beta : -3.70408 ( 3.70408 1.48401 )
Epeak [keV] : 25.2275 ( -6.18383 7.1338 )
Norm@50keV : 82.8821 ( -27.6522 465.278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.47 using 59 PHA bins.
# Reduced chi-squared = 0.6812 for 55 degrees of freedom
# Null hypothesis probability = 9.661360e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70573e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.90083 (-1.81952 2.65691)
R^2/D10^2 : 0.133245 (-0.133245 0.335852)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.59 using 59 PHA bins.
# Reduced chi-squared = 0.6771 for 57 degrees of freedom
# Null hypothesis probability = 9.706473e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.427e-08 3.946e-08
25- 50 8.559e-08 5.562e-08
50-150 1.347e-08 1.192e-08
15-150 1.633e-07 1.007e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.2429 (-18.3006 66.1063)
Norm : 0.446245 (-0.222117 0.483231)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.66 using 59 PHA bins.
# Reduced chi-squared = 0.7133 for 57 degrees of freedom
# Null hypothesis probability = 9.498418e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.183e-08 3.821e-08
25- 50 7.570e-08 4.778e-08
50-150 4.897e-08 4.246e-08
15-150 1.865e-07 1.281e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 21.9278 (-22.3662 -22.3662)
R1^2/D10^2 : 1.69215E-04 (-0.000176523 -0.000176523)
kT2 [keV] : 6.66789 (-6.65771 2.85025)
R2^2/D10^2 : 0.146815 (-0.147447 -0.147447)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.60 using 59 PHA bins.
#Fit statistic : Chi-Squared = 38.52 using 59 PHA bins.
# Reduced chi-squared = 0.7017 for 55 degrees of freedom
# Reduced chi-squared = 0.7004 for 55 degrees of freedom
# Null hypothesis probability = 9.543558e-01
# Null hypothesis probability = 9.552106e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.410e-08 2.511e-01
25- 50 8.582e-08 2.018e+00
50-150 1.364e-08 4.682e+01
15-150 1.636e-07 5.011e+01
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27854 ( -0.617875 0.780252 )
Norm@50keV : 3.44919E-04 ( -0.000184583 0.000194369 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.25 using 59 PHA bins.
# Reduced chi-squared = 0.7412 for 57 degrees of freedom
# Null hypothesis probability = 9.276778e-01
Photon flux (15-150 keV) in 64 sec: 5.96063E-02 ( -0.0221942 0.0224607 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10902e-07 ( -9.33645e-08 1.07283e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.26579 ( 6.31616 7.31554 )
Epeak [keV] : 26.2987 ( -4.82518 6.15356 )
Norm@50keV : 568.399 ( -716.505 601703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.62 using 59 PHA bins.
# Reduced chi-squared = 0.6718 for 56 degrees of freedom
# Null hypothesis probability = 9.718946e-01
Photon flux (15-150 keV) in 64 sec: 5.72348E-02 ( -0.0198773 0.0203917 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48276e-07 ( -5.56403e-08 6.92685e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96903 ( -0.0758632 -4.96903 )
beta : -3.70408 ( 3.70408 1.48401 )
Epeak [keV] : 25.2275 ( -6.18383 7.1338 )
Norm@50keV : 82.8821 ( -27.6522 465.278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.47 using 59 PHA bins.
# Reduced chi-squared = 0.6812 for 55 degrees of freedom
# Null hypothesis probability = 9.661360e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70573e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.90083 (-1.81952 2.65691)
R^2/D10^2 : 0.133245 (-0.133245 0.335852)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.59 using 59 PHA bins.
# Reduced chi-squared = 0.6771 for 57 degrees of freedom
# Null hypothesis probability = 9.706473e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.427e-08 3.824e-08
25- 50 8.559e-08 5.494e-08
50-150 1.347e-08 1.247e-08
15-150 1.633e-07 1.076e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.2429 (-18.3006 66.1063)
Norm : 0.446245 (-0.222117 0.483231)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.66 using 59 PHA bins.
# Reduced chi-squared = 0.7133 for 57 degrees of freedom
# Null hypothesis probability = 9.498418e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.183e-08 3.917e-08
25- 50 7.570e-08 4.930e-08
50-150 4.897e-08 4.253e-08
15-150 1.865e-07 1.290e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 21.9278 (-22.3662 -22.3662)
R1^2/D10^2 : 1.69215E-04 (-0.000176523 -0.000176523)
kT2 [keV] : 6.66789 (-6.65771 2.85025)
R2^2/D10^2 : 0.146815 (-0.147447 -0.147447)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.60 using 59 PHA bins.
#Fit statistic : Chi-Squared = 38.52 using 59 PHA bins.
# Reduced chi-squared = 0.7017 for 55 degrees of freedom
# Reduced chi-squared = 0.7004 for 55 degrees of freedom
# Null hypothesis probability = 9.543558e-01
# Null hypothesis probability = 9.552106e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.410e-08 2.462e-01
25- 50 8.582e-08 2.101e+00
50-150 1.364e-08 4.608e+01
15-150 1.636e-07 4.992e+01
Plot creation:
Mon Feb 26 19:31:11 EST 2018