batgrbproduct analysis for trigger=863053
batgrbproduct Analysis for Trigger=863053
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): Tue Sep 25 04:26:11 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger863053/GCN5_download_cron
======================================================================
Trigger: 00863053 Segment: 000
BAT Trigger Time: 559440112 [s; MET]
Trigger Stop: 559440872 [s; MET]
UTC: 2018-09-24T00:01:30.357740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.574443124814 Dec: -31.7671018206847 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.1
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.1
Flight Position: [ source = BAT ]
RA: 267.574443124814 Dec: -31.7671018206847 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.705295226442 Dec: -31.9592476954575 [deg; J2000]
{ 17h 50m 49.3s , -31d 57' 33.3" }
+/- 49.2656284524978 [arcmin] (estimated 90% radius based on SNR)
+/- 85.0947597988982 [arcmin] (formal 1-sigma fit error)
SNR: 0.116197916546424
Angular difference between Flight and Ground position is 13.318217 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 760 +/-
Measured from: 0
to: 760 [s; relative to TRIGTIME]
T50: 760 +/-
Measured from: 0
to: 760 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 760 second)
Measured from: 0
to: 760 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 760 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.217885 0.053905 0.208178 0.172767
0.207283 0.180382 0.152559 0.133717 [error]
Peak 0.217885 0.053905 0.208178 0.172767
0.207283 0.180382 0.152559 0.133717 [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 9.95e-081.07e-07 8.78e-087.15e-081.84e-08 5.32e-083.37e-082.52e-081.44e-09 4.90e-081.50e-087.43e-096.03e-094.64e-102.74e-101.03e-10 2.61e-072.16e-071.29e-07 3.08e-072.54e-071.27e-07 erg/cm2
Error 1.04e-07 8.86e-08 1.20e-07 9.09e-07 3.29e-07 1.02e-06 erg/cm2
Peak flux Power-law 4.33e-034.96e-03 2.15e-031.76e-035.14e-04 6.55e-044.15e-043.10e-041.92e-05 2.54e-047.75e-053.80e-052.82e-061.67e-066.46e-07 7.28e-035.48e-03 7.46e-035.54e-03 ph/cm2/s
Error 4.68e-03 2.11e-03 1.38e-03 5.19e-03 6.58e-03 6.86e-03 ph/cm2/s
Fluence Cutoff-PL 1.04e-07 8.99e-08 7.38e-08 9.37e-08 2.83e-07 3.65e-07 erg/cm2
Error 1.02e-07 -------- 1.49e-07 1.05e-06 -------- -------- erg/cm2
Peak flux Cutoff-PL 4.82e-03 3.89e-04 1.24e-05 4.38e-07 5.24e-03 5.19e-03 ph/cm2/s
Error 4.58e-03 -------- -------- 3.39e-03 6.05e-03 -------- ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 5.494 0.084 - - 2.16e-06 4.55e-05 54.330 57
CPL 2.199 3.719 90.5 0.0 4.12e-05 0.00e+00 54.590 56
The chi2 of BB fit is 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 5.494 0.084 - - 2.16e-06 4.55e-05 54.330 57
CPL 2.199 3.740 90.5 0.0 4.12e-05 0.00e+00 54.590 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 760.000 0.000 760.000
T90 760.000 0.000 760.000
T50 760.000 0.000 760.000
Peak 760.000 0.000 760.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.7053 -31.9592 1.6614 18.5 165.9 0.1046 0.1 TRIG_00863053
------------------------------------------
Foreground time interval of the image:
0.000 251.450 (delta_t = 251.450 [sec])
253.000 760.000 (delta_t = 507.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 251.450000
253.000000 760.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.49437 ( -5.37129 -5.20314 )
Norm@50keV : 2.16336E-06 ( -1.93765e-06 8.9036e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 0.9532 for 57 degrees of freedom
# Null hypothesis probability = 5.757180e-01
Photon flux (15-150 keV) in 758.5 sec: 7.27967E-03 5.48370E-03 ( -0.00726738 0.00589643 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.7959e-20 ( -1.26602e-07 5.32095e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 251.450000
253.000000 760.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19919 ( -2.25129 5.18755 )
Epeak [keV] : 90.4598 ( )
Norm@50keV : 4.12047E-05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.59 using 59 PHA bins.
# Reduced chi-squared = 0.9749 for 56 degrees of freedom
# Null hypothesis probability = 5.282064e-01
Photon flux (15-150 keV) in 758.5 sec: 5.23788E-03 ( -0.00523788 0.00685932 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26194e-19 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 251.450000
253.000000 760.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.81013 ( 9.81013 9.81013 )
beta : -5.45910 ( 5.07525 5.07525 )
Epeak [keV] : 53.7020 ( -53.702 -53.702 )
Norm@50keV : 3.16360E-04 ( -0.000314027 0.0120467 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 0.9878 for 55 degrees of freedom
# Null hypothesis probability = 5.001426e-01
Photon flux (15-150 keV) in 758.5 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] : 2.22926 (-2.1754 39.2218)
R^2/D10^2 : 6.23569 (-7.55717 -7.55717)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9525 for 57 degrees of freedom
# Null hypothesis probability = 5.773507e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.081e-07 7.028e-08
25- 50 4.884e-09 4.138e-09
50-150 4.686e-13 1.120e-12
15-150 1.130e-07 6.762e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 3.81982 (-3.72676 -3.72676)
Norm : 3.53402 (-3.93437 -3.93437)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.32 using 59 PHA bins.
# Reduced chi-squared = 0.9530 for 57 degrees of freedom
# Null hypothesis probability = 5.761868e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.052e-07 6.205e-08
25- 50 6.752e-09 5.328e-09
50-150 7.400e-12 1.115e-11
15-150 1.119e-07 7.282e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.99437 (-1.71474 2.92128)
R1^2/D10^2 : 12.6873 (-16.5702 -16.6)
kT2 [keV] : 18.9962 (-18.8211 -18.8211)
R2^2/D10^2 : 2.60931E-04 (-0.000269624 0.00181351)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.18 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.15 using 59 PHA bins.
# Reduced chi-squared = 0.9486 for 55 degrees of freedom
# Reduced chi-squared = 0.9482 for 55 degrees of freedom
# Null hypothesis probability = 5.832439e-01
# Null hypothesis probability = 5.841418e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.091e-07 5.306e-08
25- 50 6.898e-08 5.275e-08
50-150 1.816e-07 1.451e-07
15-150 3.597e-07 2.385e-07
Peak spectrum fit
Power-law model
Time interval is from 253.000 sec. to 760.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.49437 ( -5.37129 -5.20314 )
Norm@50keV : 2.16336E-06 ( -1.93765e-06 8.9036e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 0.9532 for 57 degrees of freedom
# Null hypothesis probability = 5.757180e-01
Photon flux (15-150 keV) in 758.5 sec: 7.27967E-03 5.48370E-03 ( -0.00726738 0.00589643 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.7959e-20 ( -1.26602e-07 5.32095e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 253.000 sec. to 760.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19919 ( -2.25129 5.2281 )
Epeak [keV] : 90.4598 ( )
Norm@50keV : 4.12047E-05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.59 using 59 PHA bins.
# Reduced chi-squared = 0.9749 for 56 degrees of freedom
# Null hypothesis probability = 5.282064e-01
Photon flux (15-150 keV) in 758.5 sec: 5.23788E-03 ( -0.00523788 0.00685932 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26194e-19 ( 0 0 ) ergs/cm2
Band function
Time interval is from 253.000 sec. to 760.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.81013 ( 9.81013 9.81013 )
beta : -5.45910 ( 5.07525 5.07525 )
Epeak [keV] : 53.7020 ( -53.702 -53.702 )
Norm@50keV : 3.16360E-04 ( -0.000314027 0.0120467 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 0.9878 for 55 degrees of freedom
# Null hypothesis probability = 5.001426e-01
Photon flux (15-150 keV) in 758.5 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] : 2.22926 (-2.1754 39.2218)
R^2/D10^2 : 6.23569 (-7.55717 -7.55717)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9525 for 57 degrees of freedom
# Null hypothesis probability = 5.773507e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.081e-07 6.167e-08
25- 50 4.884e-09 3.630e-09
50-150 4.686e-13 9.212e-13
15-150 1.130e-07 7.801e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 3.81982 (-3.72676 -3.72676)
Norm : 3.53402 (-3.93437 -3.93437)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.32 using 59 PHA bins.
# Reduced chi-squared = 0.9530 for 57 degrees of freedom
# Null hypothesis probability = 5.761868e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.052e-07 7.119e-08
25- 50 6.752e-09 7.638e-09
50-150 7.400e-12 1.167e-11
15-150 1.119e-07 6.789e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.92249 (-2.11626 2.79079)
R1^2/D10^2 : 18.0797 (-18.0775 0)
kT2 [keV] : 18.8679 (-18.8468 -18.8468)
R2^2/D10^2 : 2.68924E-04 (-0.000269978 0.00131319)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.18 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.13 using 59 PHA bins.
# Reduced chi-squared = 0.9486 for 55 degrees of freedom
# Reduced chi-squared = 0.9479 for 55 degrees of freedom
# Null hypothesis probability = 5.832439e-01
# Null hypothesis probability = 5.848012e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.091e-07 5.173e-08
25- 50 6.898e-08 4.505e-08
50-150 1.816e-07 1.577e-07
15-150 3.597e-07 2.314e-07
Plot creation:
Tue Sep 25 04:32:14 EDT 2018