batgrbproduct Analysis for Trigger=727541
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): Wed Dec 21 16:57:37 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger727541/GCN5_download_cron
======================================================================
Trigger: 00727541 Segment: 000
BAT Trigger Time: 503866136.64 [s; MET]
Trigger Stop: 503866137.152 [s; MET]
UTC: 2016-12-19T18:48:39.308260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 91.7173166987563 Dec: -26.7900102183723 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.78
Image Trigger?: NO
Rate S/N Ratio: 14.5258390463339 [ if not an image trigger ]
Image S/N Ratio: 7.78
Flight Position: [ source = BAT ]
RA: 91.7173166987563 Dec: -26.7900102183723 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 91.7164798412302 Dec: -26.8008645218883 [deg; J2000]
{ 06h 06m 52.0s , -26d 48' 03.1" }
+/- 0.874118001329545 [arcmin] (estimated 90% radius based on SNR)
+/- 0.269127435577625 [arcmin] (formal 1-sigma fit error)
SNR: 36.8629185818629
Angular difference between Flight and Ground position is 0.652799 arcmin
Partial Coding Fraction: 0.5 [ including projection effects ]
Duration
T90: 6.93599992990494 +/- 0.791979781306962
Measured from: 0.0440001487731934
to: 6.98000007867813 [s; relative to TRIGTIME]
T50: 2.45599991083145 +/- 0.372086019127962
Measured from: 1.42400014400482
to: 3.88000005483627 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.55599999427795
to: 2.55599999427795 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.53600001335144
to: 8.3759999871254 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.777341 1.045483 0.618830 0.132140
0.034652 0.036976 0.031327 0.023587 [error]
Peak 0.160397 0.249174 0.164201 0.046898
0.013265 0.014500 0.012562 0.008832 [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 2.95e-07 4.41e-07 4.91e-07 1.04e-06 1.54e-06 2.26e-06 erg/cm2
Error 2.16e-08 1.98e-08 3.05e-08 1.35e-07 7.25e-08 1.61e-07 erg/cm2
Peak flux Power-law 1.95e+00 1.78e+00 1.12e+00 1.08e+00 5.30e+00 5.93e+00 ph/cm2/s
Error 2.17e-01 1.27e-01 9.98e-02 1.89e-01 3.72e-01 4.05e-01 ph/cm2/s
Fluence Cutoff-PL 2.70e-07 4.64e-07 5.02e-07 4.86e-07 1.48e-06 1.72e-06 erg/cm2
Error 2.61e-08 2.48e-08 3.33e-08 2.20e-07 8.19e-08 2.33e-07 erg/cm2
Peak flux Cutoff-PL 1.72e+00 1.93e+00 1.18e+00 4.72e-01 5.15e+00 5.31e+00 ph/cm2/s
Error 2.56e-01 1.65e-01 1.15e-01 2.60e-01 3.84e-01 4.59e-01 ph/cm2/s
Fluence Band 2.56e-07 4.77e-07 4.80e-07 7.93e-07 1.48e-06 2.01e-06 erg/cm2
Error 2.91e-08 -------- -------- -------- 7.82e-08 -------- 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 1.843 0.080 - - 1.88e-02 8.76e-04 53.740 57
CPL 1.296 0.351 62.1 17.2 3.60e-02 1.54e-02 45.690 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.664 0.114 - - 4.04e-02 2.88e-03 91.020 57
CPL 0.866 0.558 67.9 25.9 1.06e-01 8.01e-02 83.760 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: 6.784000 sec.
T50 in the 50-300 keV band: 2.112000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.912 -0.536 8.376
T90 6.936 0.044 6.980
T50 2.456 1.424 3.880
Peak 1.000 1.556 2.556
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
91.7165 -26.8009 0.0052 39.4 174.1 2.6848 36.9 TRIG_00727541
------------------------------------------
Foreground time interval of the image:
-0.536 8.376 (delta_t = 8.912 [sec])
Background time interval of the image:
-239.640 -0.536 (delta_t = 239.104 [sec])
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 -0.536 sec. to 8.376 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84314 ( -0.0790443 0.0800451 )
Norm@50keV : 1.87948E-02 ( -0.000877824 0.000873794 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.74 using 59 PHA bins.
# Reduced chi-squared = 0.9429 for 57 degrees of freedom
# Null hypothesis probability = 5.980095e-01
Photon flux (15-150 keV) in 8.912 sec: 2.63447 ( -0.122256 0.122553 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54029e-06 ( -7.23848e-08 7.25891e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.536 sec. to 8.376 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29577 ( -0.36556 0.336611 )
Epeak [keV] : 62.0860 ( -9.34061 24.9721 )
Norm@50keV : 3.59935E-02 ( -0.0116405 0.0192559 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.69 using 59 PHA bins.
# Reduced chi-squared = 0.8159 for 56 degrees of freedom
# Null hypothesis probability = 8.358475e-01
Photon flux (15-150 keV) in 8.912 sec: 2.55399 ( -0.13083 0.13121 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47912e-06 ( -8.18924e-08 8.183e-08 ) ergs/cm2
Band function
Time interval is from -0.536 sec. to 8.376 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.585892 ( -0.734042 1.69717 )
beta : -2.09454 ( 2.09911 0.179856 )
Epeak [keV] : 43.3727 ( -5.56515 25.1937 )
Norm@50keV : 0.102022 ( -0.103759 1.03032 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.37 using 59 PHA bins.
# Reduced chi-squared = 0.7885 for 55 degrees of freedom
# Null hypothesis probability = 8.715460e-01
Photon flux (15-150 keV) in 8.912 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48387e-06 ( -1.4838e-06 -7.81493e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.3562 ( )
R^2/D10^2 : 0.552648 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 139.66 using 59 PHA bins.
# Reduced chi-squared = 2.4503 for 57 degrees of freedom
# Null hypothesis probability = 6.861135e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.593e-07 1.332e-08
25- 50 5.188e-07 2.714e-08
50-150 4.854e-07 5.022e-08
15-150 1.164e-06 5.748e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.0312 (-14.3238 18.6148)
Norm : 11.5849 (-0.759451 0.828053)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.55 using 59 PHA bins.
# Reduced chi-squared = 0.7990 for 57 degrees of freedom
# Null hypothesis probability = 8.623486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.698e-07 2.264e-08
25- 50 4.647e-07 2.745e-08
50-150 7.445e-07 1.984e-07
15-150 1.479e-06 2.063e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.46583 (-1.09963 1.11304)
R1^2/D10^2 : 2.52093 (-0.891974 1.71435)
kT2 [keV] : 24.2594 (-4.25399 7.14748)
R2^2/D10^2 : 2.97429E-02 (-0.0185927 0.0361103)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.66 using 59 PHA bins.
# Reduced chi-squared = 0.8666 for 55 degrees of freedom
# Null hypothesis probability = 7.481981e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.416e-07 3.654e-08
25- 50 4.848e-07 5.356e-08
50-150 7.424e-07 2.050e-07
15-150 1.469e-06 2.928e-07
Peak spectrum fit
Power-law model
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66426 ( -0.11277 0.114397 )
Norm@50keV : 4.03851E-02 ( -0.00288844 0.00287429 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.02 using 59 PHA bins.
# Reduced chi-squared = 1.597 for 57 degrees of freedom
# Null hypothesis probability = 2.806352e-03
Photon flux (15-150 keV) in 1 sec: 5.29836 ( -0.371955 0.372416 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75076e-07 ( -2.81243e-08 2.82558e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.865924 ( -0.596558 0.519914 )
Epeak [keV] : 67.9285 ( -12.2047 39.6416 )
Norm@50keV : 0.106201 ( -0.0489235 0.111262 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.76 using 59 PHA bins.
# Reduced chi-squared = 1.496 for 56 degrees of freedom
# Null hypothesis probability = 9.527004e-03
Photon flux (15-150 keV) in 1 sec: 5.15490 ( -0.38418 0.38393 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55743e-07 ( -3.1361e-08 3.1308e-08 ) ergs/cm2
Band function
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.642220 ( -0.981915 -0.0168502 )
beta : -2.03156 ( -0.51452 0.297714 )
Epeak [keV] : 41.9356 ( -17.1048 21.0832 )
Norm@50keV : 1.00537 ( -0.970988 656.152 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.70 using 59 PHA bins.
# Reduced chi-squared = 1.449 for 55 degrees of freedom
# Null hypothesis probability = 1.639496e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59505e-07 ( -3.59498e-07 -2.9969e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.9897 (-0.983808 1.07587)
R^2/D10^2 : 1.00471 (-0.256025 0.337503)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 113.02 using 59 PHA bins.
# Reduced chi-squared = 1.9829 for 57 degrees of freedom
# Null hypothesis probability = 1.443418e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.596e-08 4.575e-09
25- 50 1.237e-07 1.030e-08
50-150 1.319e-07 1.940e-08
15-150 2.916e-07 2.275e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 143.020 (-36.9842 54.3589)
Norm : 22.0810 (-1.75746 2.13054)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.30 using 59 PHA bins.
# Reduced chi-squared = 1.497 for 57 degrees of freedom
# Null hypothesis probability = 8.959053e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.693e-08 5.290e-09
25- 50 1.048e-07 1.084e-08
50-150 2.027e-07 7.373e-08
15-150 3.644e-07 8.345e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.61985 (-1.90262 1.67695)
R1^2/D10^2 : 2.40182 (-0.885793 2.02241)
kT2 [keV] : 39.7404 (-16.6643 -39.7526)
R2^2/D10^2 : 1.11309E-02 (-0.0103976 0.0687001)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.80 using 59 PHA bins.
# Reduced chi-squared = 1.451 for 55 degrees of freedom
# Null hypothesis probability = 1.609186e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.690e-08 8.540e-09
25- 50 1.204e-07 2.265e-08
50-150 1.960e-07 8.334e-08
15-150 3.633e-07 1.047e-07
Plot creation:
Wed Dec 21 17:12:48 EST 2016