batgrbproduct analysis for trigger=794972
batgrbproduct Analysis for Trigger=794972
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 6 03:27:46 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger794972/GCN5_download_cron
======================================================================
Trigger: 00794972 Segment: 000
BAT Trigger Time: 534151264 [s; MET]
Trigger Stop: 534151328 [s; MET]
UTC: 2017-12-05T07:20:43.893380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 167.44703797704 Dec: -12.603638059632 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.46
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.46
Flight Position: [ source = BAT ]
RA: 167.44703797704 Dec: -12.603638059632 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 167.422778262044 Dec: -12.5995378829849 [deg; J2000]
{ 11h 09m 41.5s , -12d 35' 58.3" }
+/- 1.592213904898 [arcmin] (estimated 90% radius based on SNR)
+/- 0.69089652597956 [arcmin] (formal 1-sigma fit error)
SNR: 15.6511024331472
Angular difference between Flight and Ground position is 1.441664 arcmin
Partial Coding Fraction: 0.4648438 [ including projection effects ]
Duration
T90: 189.191999912262 +/- 35.1681973037813
Measured from: -26.1999998688698
to: 162.992000043392 [s; relative to TRIGTIME]
T50: 71.4639999866486 +/- 18.8398879614873
Measured from: -4.41999989748001
to: 67.0440000891685 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 49.0759999752045
to: 50.0759999752045 [s; relative to TRIGTIME]
Total Fluence
Measured from: -42.227999985218
to: 197.796000003815 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.386899 1.587910 1.732591 0.518351
0.131071 0.136243 0.119372 0.102789 [error]
Peak 0.047236 0.009111 0.044484 -0.004354
0.010081 0.010291 0.009437 0.008064 [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 4.35e-07 8.42e-07 1.26e-06 4.09e-06 3.55e-06 6.62e-06 erg/cm2
Error 6.40e-08 7.35e-08 1.14e-07 8.29e-07 2.84e-07 8.93e-07 erg/cm2
Peak flux Power-law 4.18e-01 3.17e-01 1.60e-01 1.17e-01 9.49e-01 1.01e+00 ph/cm2/s
Error 1.97e-01 9.13e-02 8.44e-02 1.24e-01 2.77e-01 2.93e-01 ph/cm2/s
Fluence Cutoff-PL 4.15e-07 8.53e-07 1.29e-06 3.22e-06 3.53e-06 5.78e-06 erg/cm2
Error 8.10e-08 7.98e-08 1.35e-07 1.26e-06 2.94e-07 1.58e-06 erg/cm2
Peak flux Cutoff-PL 4.45e-01 3.15e-01 1.47e-01 9.63e-02 9.54e-01 1.01e+00 ph/cm2/s
Error 2.06e-01 9.33e-02 8.63e-02 1.38e-01 2.75e-01 2.25e-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 1.416 0.135 - - 1.54e-03 1.16e-04 61.920 57
CPL 1.225 0.441 231.4 0.0 1.87e-03 0.00e+00 61.530 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.981 0.706 - - 6.38e-03 2.53e-03 63.730 57
CPL 4.865 0.710 587.1 -0.0 3.27e-04 2.26e-03 60.630 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: 176.128000 sec.
T50 in the 50-300 keV band: 76.096000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 240.024 -42.228 197.796
T90 189.192 -26.200 162.992
T50 71.464 -4.420 67.044
Peak 1.000 49.076 50.076
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
167.4228 -12.5995 0.0123 44.5 -2.2 3.9331 15.7 TRIG_00794972
------------------------------------------
Foreground time interval of the image:
-42.228 72.301 (delta_t = 114.529 [sec])
Background time interval of the image:
-239.000 -42.228 (delta_t = 196.772 [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 -42.228 sec. to 197.796 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41629 ( -0.135305 0.135026 )
Norm@50keV : 1.53627E-03 ( -0.000115927 0.000115927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.92 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.050664e-01
Photon flux (15-150 keV) in 240 sec: 0.187793 ( -0.0153445 0.0154389 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55102e-06 ( -2.83435e-07 2.84441e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -42.228 sec. to 197.796 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22478 ( -0.573001 0.30834 )
Epeak [keV] : 231.363 ( -231.309 -231.309 )
Norm@50keV : 1.87253E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.53 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 56 degrees of freedom
# Null hypothesis probability = 2.848717e-01
Photon flux (15-150 keV) in 240 sec: 0.185711 ( -0.016319 0.016303 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.52577e-06 ( -2.94744e-07 2.93592e-07 ) ergs/cm2
Band function
Time interval is from -42.228 sec. to 197.796 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23287 ( -0.183185 0.576564 )
beta : -9.37166 ( 9.37167 19.3717 )
Epeak [keV] : 240.088 ( -143.741 -239.665 )
Norm@50keV : 1.85674E-03 ( -0.000140151 0.000615227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.53 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 55 degrees of freedom
# Null hypothesis probability = 2.538893e-01
Photon flux (15-150 keV) in 240 sec: 0.183675 ( ) 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] : 18.6847 (-1.68094 1.90356)
R^2/D10^2 : 1.01391E-02 (-0.00290456 0.00394458)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.79 using 59 PHA bins.
# Reduced chi-squared = 1.698 for 57 degrees of freedom
# Null hypothesis probability = 7.901452e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.680e-07 2.519e-08
25- 50 7.984e-07 9.288e-08
50-150 2.041e-06 2.387e-07
15-150 3.008e-06 2.724e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-27.0805 -200)
Norm : 0.784439 (-0.0594757 0.0594757)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.31 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 57 degrees of freedom
# Null hypothesis probability = 1.866634e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.688e-07 3.972e-08
25- 50 9.018e-07 1.084e-07
50-150 1.978e-06 4.992e-07
15-150 3.348e-06 8.567e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.02099 (-1.04126 1.46932)
R1^2/D10^2 : 1.69913 (-1.29396 6.78374)
kT2 [keV] : 22.6993 (-2.59578 3.44022)
R2^2/D10^2 : 4.80429E-03 (-0.00188869 0.00252689)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.76 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.093764e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.887e-07 2.226e-07
25- 50 7.229e-07 1.469e-07
50-150 2.248e-06 3.514e-07
15-150 3.460e-06 4.848e-07
Peak spectrum fit
Power-law model
Time interval is from 49.076 sec. to 50.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98071 ( -0.592409 0.819984 )
Norm@50keV : 6.38096E-03 ( -0.00278683 0.00226783 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.73 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 57 degrees of freedom
# Null hypothesis probability = 2.517766e-01
Photon flux (15-150 keV) in 1 sec: 0.948786 ( -0.276811 0.277137 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.87788e-08 ( -2.10892e-08 2.12418e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 49.076 sec. to 50.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.86501 ( -0.594468 0.826018 )
Epeak [keV] : 587.092 ( -9999.34 -9999.36 )
Norm@50keV : 3.27460E-04 ( -0.00032783 0.00418917 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.63 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 56 degrees of freedom
# Null hypothesis probability = 3.126019e-01
Photon flux (15-150 keV) in 1 sec: 0.953580 ( -0.275747 0.27509 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.87188e-08 ( -2.09415e-08 2.09306e-08 ) ergs/cm2
Band function
Time interval is from 49.076 sec. to 50.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.98489 ( -0.604033 1.57937 )
beta : -9.36956 ( 5.96673 9.36956 )
Epeak [keV] : 9999.36 ( -9.99384 -9999.36 )
Norm@50keV : 6.36995E-03 ( -0.0018366 0.00183841 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.73 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 55 degrees of freedom
# Null hypothesis probability = 1.963404e-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] : 3.38818 (-1.05649 2.11175)
R^2/D10^2 : 46.1303 (-46.1303 420.601)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.90 using 59 PHA bins.
# Reduced chi-squared = 1.296 for 57 degrees of freedom
# Null hypothesis probability = 6.553544e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.767e-08 1.072e-08
25- 50 3.866e-09 2.450e-09
50-150 1.576e-11 1.993e-11
15-150 2.155e-08 1.307e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 121.863 (-78.8819 -118.019)
Norm : 3.79427 (-1.27386 2.44228)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.81 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 57 degrees of freedom
# Null hypothesis probability = 2.229813e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.876e-09 5.980e-09
25- 50 1.772e-08 1.037e-08
50-150 3.186e-08 2.173e-08
15-150 5.945e-08 3.729e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.77292 (-0.98027 1.23026)
R1^2/D10^2 : 124.501 (-111.35 2890.62)
kT2 [keV] : 21.0672 (-5.9581 10.7806)
R2^2/D10^2 : 2.57384E-02 (-0.0196642 0.0565377)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.70 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 55 degrees of freedom
# Null hypothesis probability = 4.484169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.619e-08 9.580e-09
25- 50 1.264e-08 7.410e-09
50-150 3.673e-08 2.408e-08
15-150 6.556e-08 3.525e-08
Plot creation:
Wed Dec 6 03:50:05 EST 2017