batgrbproduct analysis for trigger=891843
batgrbproduct Analysis for Trigger=891843
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): Wed Mar 6 17:41:08 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger891843/GCN5_download_cron
======================================================================
Trigger: 00891843 Segment: 000
BAT Trigger Time: 573520336 [s; MET]
Trigger Stop: 573520400 [s; MET]
UTC: 2019-03-05T23:11:53.477920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.496487760738 Dec: -21.3921117198239 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.08
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.08
Flight Position: [ source = BAT ]
RA: 267.496487760738 Dec: -21.3921117198239 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.396158545153 Dec: -21.3636120508344 [deg; J2000]
{ 17h 49m 35.1s , -21d 21' 49.0" }
+/- 4.98477117933997 [arcmin] (estimated 90% radius based on SNR)
+/- 2.83295188209845 [arcmin] (formal 1-sigma fit error)
SNR: 3.06536603512394
Angular difference between Flight and Ground position is 5.860588 arcmin
Partial Coding Fraction: 0.84375 [ 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 0.260378 0.237453 -0.038391 -0.067893
0.078416 0.069436 0.056522 0.047708 [error]
Peak 0.260378 0.237453 -0.038391 -0.067893
0.078416 0.069436 0.056522 0.047708 [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 9.39e-08 7.08e-08 3.56e-08 2.56e-08 2.12e-07 2.24e-07 erg/cm2
Error 3.57e-08 3.36e-08 3.70e-08 4.74e-08 9.33e-08 1.16e-07 erg/cm2
Peak flux Power-law 4.89e-02 2.07e-02 5.19e-03 1.60e-03 7.57e-02 7.63e-02 ph/cm2/s
Error 1.88e-02 9.46e-03 5.29e-03 2.75e-03 2.71e-02 2.75e-02 ph/cm2/s
Fluence Cutoff-PL 8.84e-08 1.01e-07 6.20e-09 2.16e-12 1.95e-07 1.96e-07 erg/cm2
Error 4.30e-08 4.96e-08 2.20e-08 4.04e-09 7.12e-08 7.12e-08 erg/cm2
Peak flux Cutoff-PL 4.37e-02 3.05e-02 1.07e-03 1.76e-07 7.53e-02 7.53e-02 ph/cm2/s
Error 2.25e-02 1.42e-02 3.37e-03 3.13e-04 2.63e-02 2.63e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 4.37e-02 3.05e-02 1.11e-03 3.58e-06 7.53e-02 7.53e-02 ph/cm2/s
Error 2.09e-02 1.39e-02 -------- 9.03e-04 -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.005 0.838 - - 2.74e-04 1.91e-04 56.330 57
CPL -2.115 0.000 24.5 0.0 9.15e-01 0.00e+00 52.550 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.005 0.838 - - 2.74e-04 1.91e-04 56.330 57
CPL -2.115 0.000 24.5 0.0 9.15e-01 0.00e+00 52.550 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 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
267.3962 -21.3636 0.0627 29.0 -165.0 0.4343 3.1 TRIG_00891843
------------------------------------------
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: 3.00500 ( -0.685234 0.990198 )
Norm@50keV : 2.74145E-04 ( -0.000174835 0.000207225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.33 using 59 PHA bins.
# Reduced chi-squared = 0.9883 for 57 degrees of freedom
# Null hypothesis probability = 5.000104e-01
Photon flux (15-150 keV) in 64 sec: 7.57301E-02 ( -0.0269167 0.0272529 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12299e-07 ( -8.74016e-08 9.91898e-08 ) 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: -2.11539 ( )
Epeak [keV] : 24.5090 ( )
Norm@50keV : 0.914585 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9383 for 56 degrees of freedom
# Null hypothesis probability = 6.063462e-01
Photon flux (15-150 keV) in 64 sec: 7.52701E-02 ( -0.0262001 0.0264289 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95203e-07 ( -6.81523e-08 7.42349e-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 : 3.87118 ( -4.53272 -2.46264 )
beta : -9.37167 ( 9.37164 19.3491 )
Epeak [keV] : 25.8271 ( -7.7861 6.9336 )
Norm@50keV : 14.5471 ( -14.5402 27.8371 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.44 using 59 PHA bins.
# Reduced chi-squared = 0.9535 for 55 degrees of freedom
# Null hypothesis probability = 5.729287e-01
Photon flux (15-150 keV) in 64 sec: 7.52938E-02 ( ) 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] : 6.16433 (-1.5762 1.95427)
R^2/D10^2 : 0.275206 (-0.275206 0.742762)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.59 using 59 PHA bins.
# Reduced chi-squared = 0.9226 for 57 degrees of freedom
# Null hypothesis probability = 6.411231e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.236e-08 5.520e-08
25- 50 9.763e-08 6.557e-08
50-150 9.974e-09 9.075e-09
15-150 2.000e-07 1.220e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.5835 (-8.7625 18.1747)
Norm : 0.992179 (-0.537775 1.27724)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.17 using 59 PHA bins.
# Reduced chi-squared = 0.9504 for 57 degrees of freedom
# Null hypothesis probability = 5.818857e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.672e-08 5.936e-08
25- 50 8.333e-08 5.436e-08
50-150 2.408e-08 2.175e-08
15-150 2.041e-07 1.287e-07
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.59 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.48 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.39 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.36 using 59 PHA bins.
# Reduced chi-squared = 0.9563 for 55 degrees of freedom
# Reduced chi-squared = 0.9541 for 55 degrees of freedom
# Reduced chi-squared = 0.9525 for 55 degrees of freedom
# Reduced chi-squared = 0.9519 for 55 degrees of freedom
# Null hypothesis probability = 5.670927e-01
# Null hypothesis probability = 5.716192e-01
# Null hypothesis probability = 5.750344e-01
# Null hypothesis probability = 5.763110e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.300e-08 2.305e-02
25- 50 9.690e-08 2.027e-01
50-150 9.708e-09 4.509e+00
15-150 1.996e-07 4.906e+00
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: 3.00500 ( -0.685234 0.990198 )
Norm@50keV : 2.74145E-04 ( -0.000174835 0.000207225 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.33 using 59 PHA bins.
# Reduced chi-squared = 0.9883 for 57 degrees of freedom
# Null hypothesis probability = 5.000104e-01
Photon flux (15-150 keV) in 64 sec: 7.57301E-02 ( -0.0269167 0.0272529 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12299e-07 ( -8.74016e-08 9.91898e-08 ) 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: -2.11539 ( )
Epeak [keV] : 24.5090 ( )
Norm@50keV : 0.914585 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9383 for 56 degrees of freedom
# Null hypothesis probability = 6.063462e-01
Photon flux (15-150 keV) in 64 sec: 7.52701E-02 ( -0.0262001 0.0264289 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95203e-07 ( -6.81523e-08 7.42349e-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 : 3.87118 ( -4.53272 -2.46264 )
beta : -9.37167 ( 9.37164 19.3491 )
Epeak [keV] : 25.8271 ( -7.7861 6.9336 )
Norm@50keV : 14.5471 ( -14.5402 27.8371 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.44 using 59 PHA bins.
# Reduced chi-squared = 0.9535 for 55 degrees of freedom
# Null hypothesis probability = 5.729287e-01
Photon flux (15-150 keV) in 64 sec: 7.52938E-02 ( ) 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] : 6.16433 (-1.5762 1.95427)
R^2/D10^2 : 0.275206 (-0.275206 0.742762)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.59 using 59 PHA bins.
# Reduced chi-squared = 0.9226 for 57 degrees of freedom
# Null hypothesis probability = 6.411231e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.236e-08 5.690e-08
25- 50 9.763e-08 5.850e-08
50-150 9.974e-09 8.694e-09
15-150 2.000e-07 1.274e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.5835 (-8.7625 18.1747)
Norm : 0.992179 (-0.537775 1.27724)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.17 using 59 PHA bins.
# Reduced chi-squared = 0.9504 for 57 degrees of freedom
# Null hypothesis probability = 5.818857e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.672e-08 5.923e-08
25- 50 8.333e-08 5.366e-08
50-150 2.408e-08 2.203e-08
15-150 2.041e-07 1.299e-07
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.59 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.48 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.39 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.36 using 59 PHA bins.
# Reduced chi-squared = 0.9563 for 55 degrees of freedom
# Reduced chi-squared = 0.9541 for 55 degrees of freedom
# Reduced chi-squared = 0.9525 for 55 degrees of freedom
# Reduced chi-squared = 0.9519 for 55 degrees of freedom
# Null hypothesis probability = 5.670927e-01
# Null hypothesis probability = 5.716192e-01
# Null hypothesis probability = 5.750344e-01
# Null hypothesis probability = 5.763110e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.300e-08 2.251e-02
25- 50 9.690e-08 2.046e-01
50-150 9.708e-09 5.021e+00
15-150 1.996e-07 4.746e+00
Plot creation:
Wed Mar 6 17:43:51 EST 2019