batgrbproduct analysis for trigger=773082
batgrbproduct Analysis for Trigger=773082
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 19 10:51:30 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger773082/GCN5_download_cron
======================================================================
Trigger: 00773082 Segment: 000
BAT Trigger Time: 527459272 [s; MET]
Trigger Stop: 527459600 [s; MET]
UTC: 2017-09-18T20:27:32.292980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 237.01802344869 Dec: -45.6340057026754 [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: 237.01802344869 Dec: -45.6340057026754 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 236.969808018916 Dec: -45.5760778376729 [deg; J2000]
{ 15h 47m 52.8s , -45d 34' 33.9" }
+/- 5.06377859047879 [arcmin] (estimated 90% radius based on SNR)
+/- 2.87847854517467 [arcmin] (formal 1-sigma fit error)
SNR: 2.99727050246452
Angular difference between Flight and Ground position is 4.021994 arcmin
Partial Coding Fraction: 0.4648438 [ including projection effects ]
Duration
T90: 328 +/-
Measured from: 0
to: 328 [s; relative to TRIGTIME]
T50: 328 +/-
Measured from: 0
to: 328 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 328 second)
Measured from: 0
to: 328 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 328 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.102940 0.818084 0.217303 0.347774
0.224231 0.194779 0.159580 0.139600 [error]
Peak 1.102940 0.818084 0.217303 0.347774
0.224231 0.194779 0.159580 0.139600 [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 3.59e-07 3.82e-07 2.88e-07 3.54e-07 1.16e-06 1.38e-06 erg/cm2
Error 1.16e-07 1.01e-07 1.44e-07 4.11e-07 3.41e-07 5.47e-07 erg/cm2
Peak flux Power-law 3.59e-02 2.13e-02 8.05e-03 4.04e-03 6.74e-02 6.93e-02 ph/cm2/s
Error 1.19e-02 5.49e-03 3.87e-03 3.72e-03 1.67e-02 1.71e-02 ph/cm2/s
Fluence Cutoff-PL 3.50e-07 4.23e-07 2.11e-07 3.80e-08 1.01e-06 1.03e-06 erg/cm2
Error 1.24e-07 1.38e-07 1.93e-07 3.89e-07 4.01e-07 6.23e-07 erg/cm2
Peak flux Cutoff-PL 3.47e-02 2.37e-02 6.14e-03 5.57e-04 6.50e-02 6.51e-02 ph/cm2/s
Error 1.29e-02 7.89e-03 5.45e-03 4.22e-03 1.77e-02 1.88e-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 2.405 0.522 - - 3.63e-04 1.33e-04 61.570 57
CPL 1.434 2.809 19.5 0.0 1.58e-03 0.00e+00 61.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.405 0.522 - - 3.63e-04 1.33e-04 61.570 57
CPL 1.434 2.809 19.5 0.0 1.58e-03 0.00e+00 61.270 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 328.000 0.000 328.000
T90 328.000 0.000 328.000
T50 328.000 0.000 328.000
Peak 328.000 0.000 328.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
236.9698 -45.5761 0.0641 37.8 -145.3 2.0891 3.0 TRIG_00773082
------------------------------------------
Foreground time interval of the image:
0.000 328.000 (delta_t = 328.000 [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 328.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40525 ( -0.4833 0.561279 )
Norm@50keV : 3.63265E-04 ( -0.000134768 0.000131807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.57 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.158451e-01
Photon flux (15-150 keV) in 328 sec: 6.74202E-02 ( -0.0166972 0.0167089 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16367e-06 ( -3.31129e-07 3.50028e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 328.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43387 ( -4.95882 0.658224 )
Epeak [keV] : 19.5329 ( )
Norm@50keV : 1.57588E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.27 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 56 degrees of freedom
# Null hypothesis probability = 2.927334e-01
Photon flux (15-150 keV) in 328 sec: 6.49956E-02 ( -0.0173318 0.0181094 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01485e-06 ( -3.27803e-07 4.74931e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 328.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95061 ( -4.95061 -4.95061 )
beta : -2.75147 ( -1.28128 0.662755 )
Epeak [keV] : 21.7501 ( -21.7501 6.03499 )
Norm@50keV : 206.688 ( -50.0293 1.26255e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.82 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.050797e-01
Photon flux (15-150 keV) in 328 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] : 7.22291 (-1.74705 2.22888)
R^2/D10^2 : 0.111725 (-0.0760546 0.255041)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.45 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.886920e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.169e-07 1.871e-07
25- 50 4.609e-07 2.704e-07
50-150 8.543e-08 6.576e-08
15-150 8.632e-07 5.074e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.6086 (-14.2866 36.0508)
Norm : 0.505415 (-0.214944 0.416826)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.25 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 57 degrees of freedom
# Null hypothesis probability = 3.261988e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.513e-07 1.284e-07
25- 50 4.196e-07 1.916e-07
50-150 2.556e-07 1.903e-07
15-150 1.026e-06 4.592e-07
Double BB
R1^2/D10^2 : 0.155778 (-0.154759 1.0849)
kT2 [keV] : 93.2144 (-95.1336 -95.1336)
R2^2/D10^2 : 1.39034E-05 (-1.3469e-05 0.000297858)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.88 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.86 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.83 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 55 degrees of freedom
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.030030e-01
# Null hypothesis probability = 3.037585e-01
# Null hypothesis probability = 3.046923e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.445e-07 2.040e-07
25- 50 4.214e-07 2.385e-07
50-150 4.514e-07 2.494e-07
15-150 1.217e-06 6.221e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 328.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40525 ( -0.4833 0.561279 )
Norm@50keV : 3.63265E-04 ( -0.000134768 0.000131807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.57 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.158451e-01
Photon flux (15-150 keV) in 328 sec: 6.74202E-02 ( -0.0166972 0.0167089 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16367e-06 ( -3.31129e-07 3.50028e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 328.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43387 ( -4.95882 0.658224 )
Epeak [keV] : 19.5329 ( )
Norm@50keV : 1.57588E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.27 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 56 degrees of freedom
# Null hypothesis probability = 2.927334e-01
Photon flux (15-150 keV) in 328 sec: 6.49956E-02 ( -0.0173318 0.0181094 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01485e-06 ( -3.27803e-07 4.74931e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 328.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95061 ( -4.95061 -4.95061 )
beta : -2.75147 ( -1.28128 0.662755 )
Epeak [keV] : 21.7501 ( -21.7501 6.03499 )
Norm@50keV : 206.688 ( -50.0293 1.26255e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.82 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.050797e-01
Photon flux (15-150 keV) in 328 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] : 7.22291 (-1.74705 2.22888)
R^2/D10^2 : 0.111725 (-0.0760546 0.255041)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.45 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.886920e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.169e-07 1.712e-07
25- 50 4.609e-07 2.744e-07
50-150 8.543e-08 6.573e-08
15-150 8.632e-07 4.497e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.6086 (-14.2866 36.0508)
Norm : 0.505415 (-0.214944 0.416826)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.25 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 57 degrees of freedom
# Null hypothesis probability = 3.261988e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.513e-07 1.375e-07
25- 50 4.196e-07 1.957e-07
50-150 2.556e-07 1.740e-07
15-150 1.026e-06 4.157e-07
Double BB
R1^2/D10^2 : 0.155778 (-0.154759 1.07908)
kT2 [keV] : 93.2144 (-95.1336 -95.1336)
R2^2/D10^2 : 1.39034E-05 (-1.3469e-05 0.000275754)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.88 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.86 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.83 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 55 degrees of freedom
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.030030e-01
# Null hypothesis probability = 3.037585e-01
# Null hypothesis probability = 3.046923e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.445e-07 2.009e-07
25- 50 4.214e-07 2.575e-07
50-150 4.514e-07 2.881e-07
15-150 1.217e-06 5.899e-07
Plot creation:
Tue Sep 19 10:58:19 EDT 2017