batgrbproduct analysis for trigger=784159
batgrbproduct Analysis for Trigger=784159
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): Mon Oct 30 16:47:15 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger784159/GCN5_download_cron
======================================================================
Trigger: 00784159 Segment: 000
BAT Trigger Time: 530997684.032 [s; MET]
Trigger Stop: 530997685.056 [s; MET]
UTC: 2017-10-29T19:21:04.114200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 40.9309716071647 Dec: 61.6626894101486 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.82
Image Trigger?: NO
Rate S/N Ratio: 11.2694276695846 [ if not an image trigger ]
Image S/N Ratio: 7.82
Flight Position: [ source = BAT ]
RA: 40.9309716071647 Dec: 61.6626894101486 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 41.219641204149 Dec: 61.6862487986327 [deg; J2000]
{ 02h 44m 52.7s , +61d 41' 10.5" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 1.26299080697809 [arcmin] (formal 1-sigma fit error)
SNR: -6.59156811262242
Angular difference between Flight and Ground position is 8.338763 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 274.499999940395 +/- 99.3829768753229
Measured from: -102.403999865055
to: 172.09600007534 [s; relative to TRIGTIME]
T50: 138.419999957085 +/- 98.5097186867797
Measured from: -42.4119998812675
to: 96.0080000758171 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 50.7239999771118
to: 51.7239999771118 [s; relative to TRIGTIME]
Total Fluence
Measured from: -116.596000015736
to: 182.139999985695 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 25.538011 18.349107 3.326636 0.011040
0.120300 0.116058 0.088703 0.073810 [error]
Peak 0.180165 0.154290 0.044640 0.004895
0.008240 0.008163 0.005600 0.004330 [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 1.05e-05 6.78e-06 2.83e-06 1.61e-06 2.09e-05 2.17e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 1.87e+00 1.02e+00 3.50e-01 1.56e-01 3.33e+00 3.40e+00 ph/cm2/s
Error 1.62e-01 6.78e-02 4.30e-02 3.48e-02 2.18e-01 2.20e-01 ph/cm2/s
Fluence Cutoff-PL 7.78e-06 7.47e-06 2.38e-06 1.88e-07 1.78e-05 1.78e-05 erg/cm2
Error 4.55e-07 1.61e-07 1.17e-07 4.92e-08 5.52e-07 5.57e-07 erg/cm2
Peak flux Cutoff-PL 1.70e+00 1.17e+00 2.93e-01 2.34e-02 3.18e+00 3.19e+00 ph/cm2/s
Error 1.84e-01 9.64e-02 5.97e-02 -------- 2.26e-01 2.27e-01 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 3.258 0.000 - - 5.14e-03 0.00e+00 261.210 57
CPL 1.000 0.000 50.0 0.0 1.48e-02 0.00e+00 2084.810 56
The chi2 of BB fit is 246.54 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 2.546 0.129 - - 1.64e-02 1.54e-03 59.560 57
CPL 1.096 0.760 22.7 9.2 1.31e-01 1.93e-01 44.780 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: 96.192000 sec.
T50 in the 50-300 keV band: 51.648000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 298.736 -116.596 182.140
T90 274.500 -102.404 172.096
T50 138.420 -42.412 96.008
Peak 1.000 50.724 51.724
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
41.2196 +61.6862 0.0292 0.1 -41.0 -14.3202 -6.6 TRIG_00784159
------------------------------------------
Foreground time interval of the image:
-116.596 166.848 (delta_t = 283.444 [sec])
167.968 182.140 (delta_t = 14.172 [sec])
Background time interval of the image:
-119.032 -116.596 (delta_t = 2.436 [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
Multiple GTIs in the spectrum
tstart tstop
-116.596000 166.848000
167.968000 182.140000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.25799 ( )
Norm@50keV : 5.13951E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 261.21 using 59 PHA bins.
# Reduced chi-squared = 4.5827 for 57 degrees of freedom
# Null hypothesis probability = 6.462195e-28
Photon flux (15-150 keV) in 297.6 sec: 1.71560 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09217e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-116.596000 166.848000
167.968000 182.140000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.47582E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 2084.81 using 59 PHA bins.
# Reduced chi-squared = 37.2287 for 56 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Photon flux (15-150 keV) in 297.6 sec: 1.40694 ( -0.05592 0.05684 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78055e-05 ( -5.48834e-07 5.55113e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-116.596000 166.848000
167.968000 182.140000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15645 ( -0.272636 0.492887 )
beta : -4.88266 ( 9.37167 19.3692 )
Epeak [keV] : 16.1430 ( -4.05004 3.14639 )
Norm@50keV : 7.82499E-02 ( -0.0279219 0.0462205 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.32 using 59 PHA bins.
# Reduced chi-squared = 0.8967 for 55 degrees of freedom
# Null hypothesis probability = 6.906091e-01
Photon flux (15-150 keV) in 297.6 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] : 7.66205 ( )
R^2/D10^2 : 1.57880 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 246.54 using 59 PHA bins.
# Reduced chi-squared = 4.3252 for 57 degrees of freedom
# Null hypothesis probability = 2.057823e-25
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.821e-06 1.741e-07
25- 50 7.818e-06 1.577e-07
50-150 1.777e-06 7.931e-08
15-150 1.442e-05 3.080e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.9906 (-0.667103 0.696678)
Norm : 15.9081 (-0.856477 0.904319)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.8842 for 57 degrees of freedom
# Null hypothesis probability = 7.192085e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.923e-06 2.887e-07
25- 50 7.445e-06 1.414e-07
50-150 2.603e-06 1.190e-07
15-150 1.797e-05 3.735e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.77453 (-0.442194 0.461053)
R1^2/D10^2 : 9.62790 (-3.00209 5.05919)
kT2 [keV] : 10.3842 (-0.671125 0.894853)
R2^2/D10^2 : 0.238053 (-0.0969893 0.124733)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.27 using 59 PHA bins.
# Reduced chi-squared = 0.9140 for 55 degrees of freedom
# Null hypothesis probability = 6.555341e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.347e-06 6.934e-07
25- 50 7.483e-06 5.044e-07
50-150 2.507e-06 2.623e-07
15-150 1.734e-05 1.104e-06
Peak spectrum fit
Power-law model
Time interval is from 50.724 sec. to 51.724 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.54617 ( -0.126136 0.131575 )
Norm@50keV : 1.64494E-02 ( -0.00154867 0.00153554 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.56 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.827150e-01
Photon flux (15-150 keV) in 1 sec: 3.32503 ( -0.217957 0.218153 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66615e-07 ( -1.18698e-08 1.19718e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 50.724 sec. to 51.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09589 ( -0.821726 0.698633 )
Epeak [keV] : 22.7224 ( -12.9033 5.48159 )
Norm@50keV : 0.131264 ( -0.0827896 0.304102 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.78 using 59 PHA bins.
# Reduced chi-squared = 0.7996 for 56 degrees of freedom
# Null hypothesis probability = 8.591939e-01
Photon flux (15-150 keV) in 1 sec: 3.18388 ( -0.22534 0.22626 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50409e-07 ( -1.2185e-08 1.2919e-08 ) ergs/cm2
Band function
Time interval is from 50.724 sec. to 51.724 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.720228 ( -1.2709 4.1305 )
beta : -3.38802 ( 3.23252 0.452457 )
Epeak [keV] : 24.1516 ( -11.0192 3.78042 )
Norm@50keV : 0.240118 ( -0.394131 440.898 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.84 using 59 PHA bins.
# Reduced chi-squared = 0.7970 for 55 degrees of freedom
# Null hypothesis probability = 8.603113e-01
Photon flux (15-150 keV) in 1 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] : 7.64421 (-0.502841 0.532882)
R^2/D10^2 : 4.29451 (-1.07755 1.45052)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.04 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.706050e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.378e-08 4.370e-09
25- 50 7.069e-08 5.265e-09
50-150 1.594e-08 3.585e-09
15-150 1.304e-07 9.600e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.7081 (-4.10524 4.90053)
Norm : 25.4407 (-3.31327 3.87804)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.02 using 59 PHA bins.
# Reduced chi-squared = 0.7899 for 57 degrees of freedom
# Null hypothesis probability = 8.745276e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.321e-08 4.435e-09
25- 50 6.264e-08 4.245e-09
50-150 3.684e-08 7.640e-09
15-150 1.527e-07 1.130e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.24539 (-1.31396 1.23938)
R1^2/D10^2 : 14.5372 (-7.26512 25.3499)
kT2 [keV] : 12.9092 (-3.08487 7.7039)
R2^2/D10^2 : 0.262188 (-0.2327 0.847038)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.35 using 59 PHA bins.
# Reduced chi-squared = 0.8063 for 55 degrees of freedom
# Null hypothesis probability = 8.473343e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.193e-08 1.348e-08
25- 50 6.298e-08 2.032e-08
50-150 3.483e-08 1.883e-08
15-150 1.497e-07 4.671e-08
Plot creation:
Mon Oct 30 16:50:52 EDT 2017