batgrbproduct analysis for trigger=872556
batgrbproduct Analysis for Trigger=872556
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 Nov 20 08:17:13 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger872556/GCN5_download_cron
======================================================================
Trigger: 00872556 Segment: 000
BAT Trigger Time: 564308152 [s; MET]
Trigger Stop: 564308224 [s; MET]
UTC: 2018-11-19T08:15:30.055260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 9.40092208474874 Dec: 43.0648266446963 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.95
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.95
Flight Position: [ source = BAT ]
RA: 9.40092208474874 Dec: 43.0648266446963 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 9.35072046526963 Dec: 43.0789526359444 [deg; J2000]
{ 00h 37m 24.2s , +43d 04' 44.2" }
+/- 4.37101519803008 [arcmin] (estimated 90% radius based on SNR)
+/- 2.95889401663579 [arcmin] (formal 1-sigma fit error)
SNR: 3.69828848201947
Angular difference between Flight and Ground position is 2.357924 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 72 +/-
Measured from: 0
to: 72 [s; relative to TRIGTIME]
T50: 72 +/-
Measured from: 0
to: 72 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 72 second)
Measured from: 0
to: 72 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 72 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.245296 0.206239 0.066711 -0.102994
0.057265 0.059496 0.052360 0.047535 [error]
Peak 0.245296 0.206239 0.066711 -0.102994
0.057265 0.059496 0.052360 0.047535 [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 5.29e-08 6.48e-08 5.75e-08 8.84e-08 2.06e-07 2.72e-07 erg/cm2
Error 2.14e-08 2.51e-08 3.68e-08 1.20e-07 9.29e-08 1.64e-07 erg/cm2
Peak flux Power-law 2.39e-02 1.64e-02 7.35e-03 4.57e-03 4.99e-02 5.21e-02 ph/cm2/s
Error 9.86e-03 6.19e-03 4.50e-03 5.67e-03 1.81e-02 1.95e-02 ph/cm2/s
Fluence Cutoff-PL 5.14e-08 1.00e-07 1.82e-08 6.40e-11 1.70e-07 1.70e-07 erg/cm2
Error 2.51e-08 4.05e-08 3.48e-08 6.55e-09 6.68e-08 6.68e-08 erg/cm2
Peak flux Cutoff-PL 2.23e-02 2.57e-02 2.69e-03 5.17e-06 5.07e-02 5.07e-02 ph/cm2/s
Error 1.13e-02 9.57e-03 4.64e-03 4.62e-04 1.64e-02 1.66e-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 2.134 0.597 - - 3.12e-04 1.51e-04 61.820 57
CPL -3.354 0.421 31.2 8.5 1.54e+00 6.60e+04 55.350 56
The chi2 of BB fit is 55.69 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 2.134 0.597 - - 3.12e-04 1.51e-04 61.820 57
CPL -3.354 0.421 31.2 8.5 1.54e+00 7.69e+04 55.350 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 72.000 0.000 72.000
T90 72.000 0.000 72.000
T50 72.000 0.000 72.000
Peak 72.000 0.000 72.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
9.3507 +43.0790 0.0520 1.9 -60.3 0.4176 3.7 TRIG_00872556
------------------------------------------
Foreground time interval of the image:
0.000 72.000 (delta_t = 72.000 [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 72.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13358 ( -0.556702 0.636662 )
Norm@50keV : 3.12298E-04 ( -0.000151238 0.000150921 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.82 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.080665e-01
Photon flux (15-150 keV) in 72 sec: 4.98622E-02 ( -0.0180153 0.0181097 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05772e-07 ( -8.86442e-08 9.72446e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 72.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.35415 ( 4.09978 4.94241 )
Epeak [keV] : 31.2117 ( -6.36793 10.6835 )
Norm@50keV : 1.53639 ( -1.50592 131940 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.35 using 59 PHA bins.
# Reduced chi-squared = 0.9884 for 56 degrees of freedom
# Null hypothesis probability = 4.993564e-01
Photon flux (15-150 keV) in 72 sec: 5.06903E-02 ( -0.0161917 0.0166879 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69936e-07 ( -6.13404e-08 7.22153e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 72.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.44555 ( -2.89667 -2.04306 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 31.1322 ( -7.92043 9.72644 )
Norm@50keV : 1.78819 ( -0.560813 18.3717 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.611735e-01
Photon flux (15-150 keV) in 72 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] : 8.20200 (-2.04947 2.71482)
R^2/D10^2 : 5.93865E-02 (-0.0593865 0.121269)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.69 using 59 PHA bins.
# Reduced chi-squared = 0.9770 for 57 degrees of freedom
# Null hypothesis probability = 5.243041e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.295e-08 3.313e-08
25- 50 9.674e-08 5.990e-08
50-150 2.755e-08 2.224e-08
15-150 1.772e-07 1.066e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 39.8463 (-20.998 61.0003)
Norm : 0.341979 (-0.148942 0.24869)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.12 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.980457e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.647e-08 3.509e-08
25- 50 7.417e-08 4.525e-08
50-150 5.714e-08 5.036e-08
15-150 1.878e-07 1.269e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.04374 (-8.06803 -8.06803)
R1^2/D10^2 : 2.26467E-02 (-0.0228413 -0.0228413)
kT2 [keV] : 8.32456 (-8.26385 -8.26385)
R2^2/D10^2 : 3.62555E-02 (-0.036397 -0.036397)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.69 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 55 degrees of freedom
# Null hypothesis probability = 4.485760e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.279e-08 3.150e-02
25- 50 9.685e-08 2.730e-01
50-150 2.787e-08 6.584e+00
15-150 1.775e-07 6.948e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 72.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13358 ( -0.556702 0.636662 )
Norm@50keV : 3.12298E-04 ( -0.000151238 0.000150921 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.82 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.080665e-01
Photon flux (15-150 keV) in 72 sec: 4.98622E-02 ( -0.0180153 0.0181097 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05772e-07 ( -8.86442e-08 9.72446e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 72.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.35415 ( 4.09978 4.94241 )
Epeak [keV] : 31.2117 ( -6.36793 10.6835 )
Norm@50keV : 1.53639 ( -1.50592 153756 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.35 using 59 PHA bins.
# Reduced chi-squared = 0.9884 for 56 degrees of freedom
# Null hypothesis probability = 4.993564e-01
Photon flux (15-150 keV) in 72 sec: 5.06903E-02 ( -0.0161917 0.0166879 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69936e-07 ( -6.13404e-08 7.22153e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 72.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.44555 ( -2.89667 -2.04306 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 31.1322 ( -7.92043 9.72642 )
Norm@50keV : 1.78819 ( -0.560813 18.3717 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.611735e-01
Photon flux (15-150 keV) in 72 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] : 8.20200 (-2.04947 2.71482)
R^2/D10^2 : 5.93865E-02 (-0.0593865 0.121269)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.69 using 59 PHA bins.
# Reduced chi-squared = 0.9770 for 57 degrees of freedom
# Null hypothesis probability = 5.243041e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.295e-08 3.250e-08
25- 50 9.674e-08 5.918e-08
50-150 2.755e-08 2.355e-08
15-150 1.772e-07 1.128e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 39.8463 (-20.998 61.0003)
Norm : 0.341979 (-0.148942 0.24869)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.12 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.980457e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.647e-08 3.567e-08
25- 50 7.417e-08 4.925e-08
50-150 5.714e-08 5.044e-08
15-150 1.878e-07 1.281e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.04374 (-8.06803 -8.06803)
R1^2/D10^2 : 2.26467E-02 (-0.0228413 -0.0228413)
kT2 [keV] : 8.32456 (-8.26385 -8.26385)
R2^2/D10^2 : 3.62555E-02 (-0.036397 -0.036397)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.69 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 55 degrees of freedom
# Null hypothesis probability = 4.485760e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.279e-08 3.312e-02
25- 50 9.685e-08 2.542e-01
50-150 2.787e-08 6.631e+00
15-150 1.775e-07 7.610e+00
Plot creation:
Tue Nov 20 08:20:42 EST 2018