batgrbproduct analysis for trigger=771371
batgrbproduct Analysis for Trigger=771371
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 Sep 9 11:51:38 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger771371/GCN5_download_cron
======================================================================
Trigger: 00771371 Segment: 000
BAT Trigger Time: 526551248 [s; MET]
Trigger Stop: 526551312 [s; MET]
UTC: 2017-09-08T08:13:48.346800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 233.846937958456 Dec: -57.2333693221856 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 23.43
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 23.43
Flight Position: [ source = BAT ]
RA: 233.846937958456 Dec: -57.2333693221856 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 233.833840672826 Dec: -57.223249969909 [deg; J2000]
{ 15h 35m 20.1s , -57d 13' 23.7" }
+/- 0.859392746464856 [arcmin] (estimated 90% radius based on SNR)
+/- 0.248886781576168 [arcmin] (formal 1-sigma fit error)
SNR: 37.7685455179028
Angular difference between Flight and Ground position is 0.741338 arcmin
Partial Coding Fraction: 0.9765625 [ 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 2.212669 2.034809 0.572659 -0.017630
0.062587 0.061277 0.046672 0.038928 [error]
Peak 2.212669 2.034809 0.572659 -0.017630
0.062587 0.061277 0.046672 0.038928 [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 7.55e-07 7.58e-07 5.34e-07 5.97e-07 2.28e-06 2.64e-06 erg/cm2
Error 4.67e-08 3.25e-08 4.22e-08 9.17e-08 1.02e-07 1.47e-07 erg/cm2
Peak flux Power-law 3.89e-01 2.17e-01 7.66e-02 3.53e-02 7.02e-01 7.18e-01 ph/cm2/s
Error 2.46e-02 9.25e-03 5.83e-03 5.07e-03 3.16e-02 3.15e-02 ph/cm2/s
Fluence Cutoff-PL 6.48e-07 8.70e-07 4.28e-07 5.75e-08 2.00e-06 2.00e-06 erg/cm2
Error 5.52e-08 4.43e-08 5.83e-08 3.71e-08 1.12e-07 1.18e-07 erg/cm2
Peak flux Cutoff-PL 3.27e-01 2.48e-01 6.47e-02 4.69e-03 6.45e-01 6.45e-01 ph/cm2/s
Error 2.94e-02 1.25e-02 7.94e-03 2.81e-03 3.44e-02 3.46e-02 ph/cm2/s
Fluence Band 6.40e-07 8.68e-07 4.23e-07 1.10e-07 2.01e-06 2.05e-06 erg/cm2
Error 5.58e-08 4.49e-08 -------- 1.32e-07 1.22e-07 -------- erg/cm2
Peak flux Band 3.27e-01 2.48e-01 6.48e-02 4.74e-03 6.44e-01 6.45e-01 ph/cm2/s
Error 2.92e-02 1.24e-02 7.92e-03 -------- 3.43e-02 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.505 0.087 - - 3.56e-03 2.04e-04 104.070 57
CPL 0.787 0.533 27.0 4.1 3.76e-02 3.17e-02 59.080 56
The chi2 of BB fit is 96.37 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 2.505 0.087 - - 3.56e-03 2.04e-04 104.070 57
CPL 0.787 0.533 27.0 4.1 3.76e-02 3.17e-02 59.080 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
233.8338 -57.2232 0.0051 16.8 24.9 5.0537 37.8 TRIG_00771371
------------------------------------------
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: 2.50538 ( -0.0860356 0.0880029 )
Norm@50keV : 3.56035E-03 ( -0.000204064 0.00020295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.07 using 59 PHA bins.
# Reduced chi-squared = 1.8259 for 57 degrees of freedom
# Null hypothesis probability = 1.413023e-04
Photon flux (15-150 keV) in 64 sec: 0.701727 ( -0.0315435 0.0316333 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28184e-06 ( -1.02263e-07 1.02687e-07 ) 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: 0.787171 ( -0.563373 0.502484 )
Epeak [keV] : 26.9615 ( -4.96971 3.27979 )
Norm@50keV : 3.76319E-02 ( -0.0187233 0.0446191 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.08 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 56 degrees of freedom
# Null hypothesis probability = 3.638086e-01
Photon flux (15-150 keV) in 64 sec: 0.644517 ( -0.034361 0.034526 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99722e-06 ( -1.09562e-07 1.13702e-07 ) 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 : -0.788422 ( -0.452006 1.82147 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 26.9514 ( -3.98148 3.28083 )
Norm@50keV : 3.75605E-02 ( -0.0186429 0.044764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.08 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 55 degrees of freedom
# Null hypothesis probability = 3.290145e-01
Photon flux (15-150 keV) in 64 sec: 0.644249 ( 6.35575 -0.034482 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00926e-06 ( -2.00881e-06 -1.24858e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.28638 (-0.355286 0.37145)
R^2/D10^2 : 0.626403 (-0.108282 0.130927)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.37 using 59 PHA bins.
# Reduced chi-squared = 1.691 for 57 degrees of freedom
# Null hypothesis probability = 8.702099e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.103e-07 3.555e-08
25- 50 9.485e-07 4.352e-08
50-150 2.792e-07 3.539e-08
15-150 1.738e-06 8.288e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.3067 (-3.07745 3.50105)
Norm : 4.94966 (-0.447253 0.496114)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.33 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.922815e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.863e-07 4.032e-08
25- 50 8.411e-07 3.520e-08
50-150 5.454e-07 6.662e-08
15-150 2.073e-06 8.736e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.50168 (-1.00602 0.962923)
R1^2/D10^2 : 2.22571 (-0.899377 2.22312)
kT2 [keV] : 12.7849 (-2.04745 3.40594)
R2^2/D10^2 : 6.04636E-02 (-0.043063 0.0948491)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 55 degrees of freedom
# Null hypothesis probability = 3.807647e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.345e-07 1.308e-07
25- 50 8.644e-07 2.208e-07
50-150 4.902e-07 2.352e-07
15-150 1.989e-06 4.867e-07
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: 2.50538 ( -0.0860356 0.0880029 )
Norm@50keV : 3.56035E-03 ( -0.000204064 0.00020295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.07 using 59 PHA bins.
# Reduced chi-squared = 1.8259 for 57 degrees of freedom
# Null hypothesis probability = 1.413023e-04
Photon flux (15-150 keV) in 64 sec: 0.701727 ( -0.0315435 0.0316333 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28184e-06 ( -1.02263e-07 1.02687e-07 ) 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: 0.787171 ( -0.563373 0.502484 )
Epeak [keV] : 26.9615 ( -4.96971 3.27979 )
Norm@50keV : 3.76319E-02 ( -0.0187233 0.0446191 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.08 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 56 degrees of freedom
# Null hypothesis probability = 3.638086e-01
Photon flux (15-150 keV) in 64 sec: 0.644517 ( -0.034361 0.034526 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99722e-06 ( -1.09562e-07 1.13702e-07 ) 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 : -0.788422 ( -0.452006 1.82147 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 26.9514 ( -3.98148 3.28083 )
Norm@50keV : 3.75605E-02 ( -0.0186429 0.044764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.08 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 55 degrees of freedom
# Null hypothesis probability = 3.290145e-01
Photon flux (15-150 keV) in 64 sec: 0.644249 ( 6.35575 -0.034482 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00926e-06 ( -2.00881e-06 -1.24858e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.28638 (-0.355286 0.37145)
R^2/D10^2 : 0.626403 (-0.108282 0.130927)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.37 using 59 PHA bins.
# Reduced chi-squared = 1.691 for 57 degrees of freedom
# Null hypothesis probability = 8.702099e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.103e-07 3.754e-08
25- 50 9.485e-07 4.288e-08
50-150 2.792e-07 3.635e-08
15-150 1.738e-06 7.520e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.3067 (-3.07745 3.50105)
Norm : 4.94966 (-0.447253 0.496114)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.33 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.922815e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.863e-07 4.317e-08
25- 50 8.411e-07 3.584e-08
50-150 5.454e-07 6.733e-08
15-150 2.073e-06 9.696e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.50168 (-1.00602 0.962923)
R1^2/D10^2 : 2.22571 (-0.899377 2.22312)
kT2 [keV] : 12.7849 (-2.04745 3.40594)
R2^2/D10^2 : 6.04636E-02 (-0.043063 0.0948491)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 55 degrees of freedom
# Null hypothesis probability = 3.807647e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.345e-07 1.457e-07
25- 50 8.644e-07 1.928e-07
50-150 4.902e-07 2.265e-07
15-150 1.989e-06 5.011e-07
Plot creation:
Sat Sep 9 12:14:07 EDT 2017