batgrbproduct analysis for trigger=873539
batgrbproduct Analysis for Trigger=873539
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 27 06:00:17 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger873539/GCN5_download_cron
======================================================================
Trigger: 00873539 Segment: 000
BAT Trigger Time: 564918870.08 [s; MET]
Trigger Stop: 564918870.336 [s; MET]
UTC: 2018-11-26T09:54:08.097180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 152.350664748836 Dec: -29.6790891415622 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.69
Image Trigger?: NO
Rate S/N Ratio: 18.7349939951952 [ if not an image trigger ]
Image S/N Ratio: 8.69
Flight Position: [ source = BAT ]
RA: 152.350664748836 Dec: -29.6790891415622 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 152.349856080723 Dec: -29.6980347528505 [deg; J2000]
{ 10h 09m 24.0s , -29d 41' 52.9" }
+/- 1.53725830715497 [arcmin] (estimated 90% radius based on SNR)
+/- 0.591447460241903 [arcmin] (formal 1-sigma fit error)
SNR: 16.4564883894336
Angular difference between Flight and Ground position is 1.137518 arcmin
Partial Coding Fraction: 0.6875 [ including projection effects ]
Duration
T90: 2.09200000762939 +/- 0.118928534389858
Measured from: 0.0160000324249268
to: 2.10800004005432 [s; relative to TRIGTIME]
T50: 1.6159999370575 +/- 1.09446788754849
Measured from: 0.308000087738037
to: 1.92400002479553 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.21799993515015
to: 2.21799993515015 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0680000782012939
to: 2.16399991512299 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.087313 0.183884 0.161910 0.030542
0.014498 0.016122 0.014858 0.010863 [error]
Peak 0.073964 0.125874 0.105319 0.018015
0.010588 0.012049 0.011198 0.007763 [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 3.17e-08 6.94e-08 1.20e-07 4.77e-07 3.27e-07 6.97e-07 erg/cm2
Error 5.38e-09 7.48e-09 1.35e-08 1.13e-07 3.48e-08 1.23e-07 erg/cm2
Peak flux Power-law 7.88e-01 8.82e-01 7.07e-01 9.40e-01 2.72e+00 3.32e+00 ph/cm2/s
Error 1.39e-01 9.98e-02 8.64e-02 2.29e-01 2.85e-01 3.55e-01 ph/cm2/s
Fluence Cutoff-PL 2.44e-08 7.86e-08 1.34e-07 1.14e-07 3.06e-07 3.51e-07 erg/cm2
Error 6.29e-09 9.49e-09 1.66e-08 7.71e-08 3.69e-08 8.22e-08 erg/cm2
Peak flux Cutoff-PL 6.91e-01 9.40e-01 7.63e-01 4.96e-01 2.68e+00 2.89e+00 ph/cm2/s
Error 1.65e-01 1.18e-01 1.05e-01 3.23e-01 2.89e-01 4.23e-01 ph/cm2/s
Fluence Band 2.11e-08 8.68e-08 1.20e-07 2.90e-07 3.11e-07 5.19e-07 erg/cm2
Error 7.06e-09 1.13e-08 1.49e-08 1.12e-07 3.56e-08 1.20e-07 erg/cm2
Peak flux Band 7.06e-01 9.26e-01 7.58e-01 5.73e-01 2.70e+00 2.97e+00 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 1.215 0.151 - - 1.45e-02 1.41e-03 79.710 57
CPL -0.133 0.747 83.8 24.2 6.45e-02 6.08e-02 66.640 56
The chi2 of BB fit is 73.32 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 1.320 0.164 - - 2.27e-02 2.35e-03 53.410 57
CPL 0.651 0.681 106.7 276.9 4.82e-02 4.13e-02 50.060 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: 2.048000 sec.
T50 in the 50-300 keV band: 1.728000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.232 -0.068 2.164
T90 2.092 0.016 2.108
T50 1.616 0.308 1.924
Peak 1.000 1.218 2.218
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
152.3499 -29.6980 0.0117 26.9 -128.6 0.4744 16.5 TRIG_00873539
------------------------------------------
Foreground time interval of the image:
-0.068 2.164 (delta_t = 2.232 [sec])
Background time interval of the image:
-239.080 -115.770 (delta_t = 123.310 [sec])
-115.080 -0.068 (delta_t = 115.012 [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 -0.068 sec. to 2.164 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21514 ( -0.152191 0.150488 )
Norm@50keV : 1.45144E-02 ( -0.00141258 0.00141257 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.71 using 59 PHA bins.
# Reduced chi-squared = 1.398 for 57 degrees of freedom
# Null hypothesis probability = 2.520689e-02
Photon flux (15-150 keV) in 2.232 sec: 1.70740 ( -0.169918 0.170188 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27287e-07 ( -3.46496e-08 3.48632e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.068 sec. to 2.164 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.133163 ( -0.811242 0.683503 )
Epeak [keV] : 83.8279 ( -14.883 33.6022 )
Norm@50keV : 6.45452E-02 ( -0.033545 0.0880409 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.64 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 56 degrees of freedom
# Null hypothesis probability = 1.562303e-01
Photon flux (15-150 keV) in 2.232 sec: 1.64174 ( -0.17295 0.17335 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06056e-07 ( -3.67164e-08 3.70155e-08 ) ergs/cm2
Band function
Time interval is from -0.068 sec. to 2.164 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.133991 ( -0.431714 1.30271 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 83.7981 ( -14.8594 33.6145 )
Norm@50keV : 6.46080E-02 ( -0.0336064 0.088348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.64 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 55 degrees of freedom
# Null hypothesis probability = 1.351100e-01
Photon flux (15-150 keV) in 2.232 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11063e-07 ( -3.11047e-07 -3.5779e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.9533 (-1.93538 2.21339)
R^2/D10^2 : 0.118188 (-0.0384125 0.0554516)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.32 using 59 PHA bins.
# Reduced chi-squared = 1.286 for 57 degrees of freedom
# Null hypothesis probability = 7.162732e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.704e-08 3.413e-09
25- 50 7.864e-08 1.105e-08
50-150 1.839e-07 3.224e-08
15-150 2.796e-07 3.627e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-25.5924 -200)
Norm : 7.09361 (-0.700477 0.700477)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.81 using 59 PHA bins.
# Reduced chi-squared = 1.541 for 57 degrees of freedom
# Null hypothesis probability = 5.449163e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.942e-08 1.886e-08
25- 50 7.583e-08 4.122e-08
50-150 1.663e-07 8.091e-08
15-150 2.815e-07 1.531e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.45211 (-3.36735 4.18038)
R1^2/D10^2 : 0.451159 (-0.272718 0.914481)
kT2 [keV] : 25.4551 (-19.3488 16.9654)
R2^2/D10^2 : 2.74992E-02 (-0.023694 0.0502293)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.99 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 55 degrees of freedom
# Null hypothesis probability = 1.677183e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.477e-08 1.383e-08
25- 50 8.024e-08 4.174e-08
50-150 2.059e-07 1.117e-07
15-150 3.109e-07 1.609e-07
Peak spectrum fit
Power-law model
Time interval is from 1.218 sec. to 2.218 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32009 ( -0.164126 0.164623 )
Norm@50keV : 2.27412E-02 ( -0.00235323 0.00235042 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.41 using 59 PHA bins.
# Reduced chi-squared = 0.9370 for 57 degrees of freedom
# Null hypothesis probability = 6.104999e-01
Photon flux (15-150 keV) in 1 sec: 2.72339 ( -0.284878 0.285129 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23642e-07 ( -2.54935e-08 2.56466e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.218 sec. to 2.218 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.651380 ( -0.733656 0.628655 )
Epeak [keV] : 106.736 ( -32.301 521.508 )
Norm@50keV : 4.82465E-02 ( -0.0240003 0.0586799 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.06 using 59 PHA bins.
# Reduced chi-squared = 0.8939 for 56 degrees of freedom
# Null hypothesis probability = 6.980507e-01
Photon flux (15-150 keV) in 1 sec: 2.67810 ( -0.28891 0.28879 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17389e-07 ( -2.6894e-08 2.6791e-08 ) ergs/cm2
Band function
Time interval is from 1.218 sec. to 2.218 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.651508 ( -0.402971 0.817459 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 106.732 ( -25.1335 527.463 )
Norm@50keV : 4.82383E-02 ( -0.0482381 0.0587158 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.06 using 59 PHA bins.
# Reduced chi-squared = 0.9102 for 55 degrees of freedom
# Null hypothesis probability = 6.634014e-01
Photon flux (15-150 keV) in 1 sec: 2.69506 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18005e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.2943 (-2.21685 2.56107)
R^2/D10^2 : 0.204292 (-0.076056 0.120278)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.32 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 57 degrees of freedom
# Null hypothesis probability = 1.864609e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.238e-08 2.419e-09
25- 50 5.554e-08 7.710e-09
50-150 1.193e-07 2.328e-08
15-150 1.872e-07 2.870e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-35.5405 -200)
Norm : 11.2896 (-1.16769 1.16769)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.72 using 59 PHA bins.
# Reduced chi-squared = 0.9950 for 57 degrees of freedom
# Null hypothesis probability = 4.856470e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.811e-08 7.195e-09
25- 50 5.407e-08 1.953e-08
50-150 1.186e-07 6.454e-08
15-150 2.008e-07 1.100e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.76992 (-2.46617 3.04011)
R1^2/D10^2 : 1.63238 (-1.00316 4.00147)
kT2 [keV] : 26.9318 (-6.04721 13.5568)
R2^2/D10^2 : 3.61879E-02 (-0.0276987 0.0574797)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.73 using 59 PHA bins.
# Reduced chi-squared = 0.8860 for 55 degrees of freedom
# Null hypothesis probability = 7.116074e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.180e-08 1.075e-08
25- 50 5.472e-08 2.494e-08
50-150 1.434e-07 7.696e-08
15-150 2.200e-07 8.985e-08
Plot creation:
Tue Nov 27 06:03:31 EST 2018