batgrbproduct analysis for trigger=868853
batgrbproduct Analysis for Trigger=868853
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): Sat Oct 27 16:10:16 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger868853/GCN5_download_cron
======================================================================
Trigger: 00868853 Segment: 000
BAT Trigger Time: 562219096 [s; MET]
Trigger Stop: 562219160 [s; MET]
UTC: 2018-10-26T03:57:54.185260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 307.799597663764 Dec: 40.6713205264322 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.04
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.04
Flight Position: [ source = BAT ]
RA: 307.799597663764 Dec: 40.6713205264322 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 307.685605770818 Dec: 40.674825658437 [deg; J2000]
{ 20h 30m 44.5s , +40d 40' 29.4" }
+/- 3.45819740293046 [arcmin] (estimated 90% radius based on SNR)
+/- 1.52215601311347 [arcmin] (formal 1-sigma fit error)
SNR: 5.16812464625274
Angular difference between Flight and Ground position is 5.191627 arcmin
Partial Coding Fraction: 0.828125 [ 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 0.391293 0.227752 -0.025037 0.009142
0.060158 0.061633 0.053276 0.047375 [error]
Peak 0.391293 0.227752 -0.025037 0.009142
0.060158 0.061633 0.053276 0.047375 [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 1.21e-07 8.83e-08 4.26e-08 2.91e-08 2.66e-07 2.81e-07 erg/cm2
Error 2.89e-08 3.17e-08 3.09e-08 4.29e-08 8.50e-08 1.05e-07 erg/cm2
Peak flux Power-law 6.39e-02 2.62e-02 6.32e-03 1.85e-03 9.75e-02 9.83e-02 ph/cm2/s
Error 1.55e-02 8.97e-03 4.45e-03 2.57e-03 2.31e-02 2.35e-02 ph/cm2/s
Fluence Cutoff-PL 1.22e-07 1.02e-07 2.46e-08 1.19e-09 2.50e-07 2.49e-07 erg/cm2
Error 3.08e-08 4.06e-08 3.33e-08 2.99e-08 7.52e-08 8.62e-08 erg/cm2
Peak flux Cutoff-PL 6.34e-02 3.04e-02 3.92e-03 1.05e-04 9.81e-02 9.77e-02 ph/cm2/s
Error 1.65e-02 1.16e-02 4.93e-03 1.83e-03 2.24e-02 2.25e-02 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 3.052 0.630 - - 3.41e-04 1.88e-04 67.550 57
CPL 1.271 0.000 12.5 0.0 5.89e-03 0.00e+00 65.940 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.052 0.630 - - 3.41e-04 1.88e-04 67.550 57
CPL 1.271 0.000 12.5 0.0 5.89e-03 0.00e+00 65.940 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
307.6856 +40.6748 0.0372 26.2 -148.3 0.6257 5.2 TRIG_00868853
------------------------------------------
Foreground time interval of the image:
0.000 4.290 (delta_t = 4.290 [sec])
5.000 64.000 (delta_t = 59.000 [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 4.290000
5.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.05201 ( -0.541228 0.718552 )
Norm@50keV : 3.41440E-04 ( -0.000175061 0.000201487 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.55 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 57 degrees of freedom
# Null hypothesis probability = 1.600117e-01
Photon flux (15-150 keV) in 63.29 sec: 9.75431E-02 ( -0.0229908 0.0231679 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.66082e-07 ( -7.98846e-08 9.01889e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 4.290000
5.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27102 ( )
Epeak [keV] : 12.5035 ( )
Norm@50keV : 5.88856E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.94 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 56 degrees of freedom
# Null hypothesis probability = 1.707537e-01
Photon flux (15-150 keV) in 63.29 sec: 9.80592E-02 ( -0.0224672 0.0222688 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49902e-07 ( -6.92101e-08 8.11017e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 4.290000
5.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21366 ( -3.94287 1.11258 )
beta : -9.99964 ( 9.99964 19.9996 )
Epeak [keV] : 13.0360 ( -8.22998 10.0996 )
Norm@50keV : 6.45465E-03 ( -0.00646564 3.59292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.94 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 55 degrees of freedom
# Null hypothesis probability = 1.482491e-01
Photon flux (15-150 keV) in 63.29 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] : 5.51643 (-1.4657 1.79573)
R^2/D10^2 : 0.536058 (-0.375603 1.6641)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.03 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.504166e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.203e-07 6.370e-08
25- 50 9.939e-08 5.896e-08
50-150 6.366e-09 5.718e-09
15-150 2.261e-07 1.171e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5782 (-7.36524 11.9865)
Norm : 1.33090 (-0.569798 1.26646)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.95 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.949142e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.224e-07 5.233e-08
25- 50 1.011e-07 5.180e-08
50-150 2.667e-08 2.266e-08
15-150 2.501e-07 1.149e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.07837 (-2.79307 2.71385)
R1^2/D10^2 : 5.11886 (-2.84697 -5.47202)
kT2 [keV] : 8.34253 (-6.48782 6.47151)
R2^2/D10^2 : 6.11531E-02 (-0.062108 0.617178)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.29 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 55 degrees of freedom
# Null hypothesis probability = 1.614261e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.211e-07 6.209e-08
25- 50 1.056e-07 5.658e-08
50-150 2.839e-08 1.810e-08
15-150 2.551e-07 1.352e-07
Peak spectrum fit
Power-law model
Time interval is from 5.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.05201 ( -0.541228 0.718552 )
Norm@50keV : 3.41440E-04 ( -0.000175061 0.000201487 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.55 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 57 degrees of freedom
# Null hypothesis probability = 1.600117e-01
Photon flux (15-150 keV) in 63.29 sec: 9.75431E-02 ( -0.0229908 0.0231679 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.66082e-07 ( -7.98846e-08 9.01889e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27102 ( )
Epeak [keV] : 12.5035 ( )
Norm@50keV : 5.88856E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.94 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 56 degrees of freedom
# Null hypothesis probability = 1.707537e-01
Photon flux (15-150 keV) in 63.29 sec: 9.80592E-02 ( -0.0224672 0.0222688 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49902e-07 ( -6.92101e-08 8.11017e-08 ) ergs/cm2
Band function
Time interval is from 5.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21366 ( -3.94287 1.11258 )
beta : -9.99964 ( 9.99964 19.9996 )
Epeak [keV] : 13.0360 ( -8.22998 10.0996 )
Norm@50keV : 6.45465E-03 ( -0.00646564 3.59292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.94 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 55 degrees of freedom
# Null hypothesis probability = 1.482491e-01
Photon flux (15-150 keV) in 63.29 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] : 5.51643 (-1.4657 1.79573)
R^2/D10^2 : 0.536058 (-0.375603 1.6641)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.03 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.504166e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.203e-07 6.210e-08
25- 50 9.939e-08 5.545e-08
50-150 6.366e-09 5.693e-09
15-150 2.261e-07 1.251e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5782 (-7.36524 11.9865)
Norm : 1.33090 (-0.569798 1.26646)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.95 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.949142e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.224e-07 5.091e-08
25- 50 1.011e-07 5.304e-08
50-150 2.667e-08 2.304e-08
15-150 2.501e-07 1.149e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.07837 (-2.9841 2.71919)
R1^2/D10^2 : 5.11886 (-2.84697 -5.47202)
kT2 [keV] : 8.34253 (-8.30542 9.15337)
R2^2/D10^2 : 6.11531E-02 (-0.062108 0.618904)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.29 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 55 degrees of freedom
# Null hypothesis probability = 1.614261e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.211e-07 5.905e-08
25- 50 1.056e-07 5.756e-08
50-150 2.839e-08 2.226e-08
15-150 2.551e-07 1.307e-07
Plot creation:
Sat Oct 27 16:14:29 EDT 2018