batgrbproduct analysis for trigger=772052
batgrbproduct Analysis for Trigger=772052
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 Sep 13 10:37:30 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger772052/GCN5_download_cron
======================================================================
Trigger: 00772052 Segment: 000
BAT Trigger Time: 526890846.512 [s; MET]
Trigger Stop: 526890846.576 [s; MET]
UTC: 2017-09-12T06:33:46.838680 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 215.466285762874 Dec: -62.0301303055386 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.99
Image Trigger?: NO
Rate S/N Ratio: 20.7364413533277 [ if not an image trigger ]
Image S/N Ratio: 9.99
Flight Position: [ source = BAT ]
RA: 215.466285762874 Dec: -62.0301303055386 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 215.466280968469 Dec: -61.9981548518884 [deg; J2000]
{ 14h 21m 51.9s , -61d 59' 53.4" }
+/- 0.636480460463231 [arcmin] (estimated 90% radius based on SNR)
+/- 0.185186906831443 [arcmin] (formal 1-sigma fit error)
SNR: 57.9996556064216
Angular difference between Flight and Ground position is 1.918527 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 17.7760000228882 +/- 7.93703218078818
Measured from: -0.00799989700317383
to: 17.768000125885 [s; relative to TRIGTIME]
T50: 7.58400005102158 +/- 0.307349953268932
Measured from: 1.40000009536743
to: 8.98400014638901 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0840000510215759
to: 0.915999948978424 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.57600003480911
to: 38.6959999799728 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.602121 1.806436 0.961837 0.228181
0.051341 0.048106 0.037826 0.029937 [error]
Peak 0.228344 0.293705 0.149681 0.015716
0.010804 0.010931 0.008432 0.005334 [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 4.80e-07 6.98e-07 7.56e-07 1.53e-06 2.41e-06 3.47e-06 erg/cm2
Error 3.05e-08 2.55e-08 3.84e-08 1.70e-07 8.89e-08 1.97e-07 erg/cm2
Peak flux Power-law 2.34e+00 1.91e+00 1.06e+00 8.59e-01 5.69e+00 6.17e+00 ph/cm2/s
Error 1.79e-01 9.23e-02 6.92e-02 1.11e-01 2.78e-01 2.89e-01 ph/cm2/s
Fluence Cutoff-PL 4.64e-07 7.09e-07 7.60e-07 1.15e-06 2.37e-06 3.08e-06 erg/cm2
Error 3.73e-08 2.96e-08 3.97e-08 4.34e-07 1.06e-07 3.28e-07 erg/cm2
Peak flux Cutoff-PL 2.11e+00 2.04e+00 1.09e+00 4.09e-01 5.51e+00 5.65e+00 ph/cm2/s
Error 2.11e-01 1.15e-01 7.70e-02 1.57e-01 2.92e-01 3.35e-01 ph/cm2/s
Fluence Band 4.40e-07 7.20e-07 7.44e-07 1.38e-06 2.35e-06 3.31e-06 erg/cm2
Error -------- 3.27e-08 3.99e-08 -------- -------- -------- erg/cm2
Peak flux Band 1.97e+00 2.16e+00 1.03e+00 6.29e-01 5.46e+00 5.78e+00 ph/cm2/s
Error 2.43e-01 1.33e-01 7.59e-02 -------- 2.98e-01 3.29e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.884 0.070 - - 6.50e-03 2.40e-04 43.120 57
CPL 1.701 0.255 79.1 -27.6 8.05e-03 2.38e-03 41.720 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.855 0.083 - - 4.04e-02 2.05e-03 62.030 57
CPL 1.181 0.367 56.6 11.1 9.22e-02 4.32e-02 50.310 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: 41.920000 sec.
T50 in the 50-300 keV band: 8.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 40.272 -1.576 38.696
T90 17.776 -0.008 17.768
T50 7.584 1.400 8.984
Peak 1.000 -0.084 0.916
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
215.4663 -61.9982 0.0033 10.4 -152.7 3.4094 58.0 TRIG_00772052
------------------------------------------
Foreground time interval of the image:
-1.576 8.789 (delta_t = 10.365 [sec])
Background time interval of the image:
-239.512 -1.576 (delta_t = 237.936 [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 -1.576 sec. to 38.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88429 ( -0.0692462 0.0697726 )
Norm@50keV : 6.49885E-03 ( -0.000240929 0.00024001 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.12 using 59 PHA bins.
# Reduced chi-squared = 0.7565 for 57 degrees of freedom
# Null hypothesis probability = 9.130827e-01
Photon flux (15-150 keV) in 40.27 sec: 0.926496 ( -0.0355959 0.0357439 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40587e-06 ( -8.87937e-08 8.9043e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.576 sec. to 38.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70100 ( -0.279747 0.230014 )
Epeak [keV] : 79.0555 ( -23.9386 -79.0558 )
Norm@50keV : 8.05320E-03 ( -0.00171778 0.003037 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.72 using 59 PHA bins.
# Reduced chi-squared = 0.7450 for 56 degrees of freedom
# Null hypothesis probability = 9.222883e-01
Photon flux (15-150 keV) in 40.27 sec: 0.913387 ( -0.039864 0.040004 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36568e-06 ( -1.06438e-07 1.0591e-07 ) ergs/cm2
Band function
Time interval is from -1.576 sec. to 38.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.70100 ( 1.77695 0.339911 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 79.0414 ( -22.4207 -79.0414 )
Norm@50keV : 8.05142E-03 ( -0.00261189 0.0029369 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.72 using 59 PHA bins.
# Reduced chi-squared = 0.7585 for 55 degrees of freedom
# Null hypothesis probability = 9.067060e-01
Photon flux (15-150 keV) in 40.27 sec: 0.897345 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35356e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2986 ( )
R^2/D10^2 : 0.186824 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 227.65 using 59 PHA bins.
# Reduced chi-squared = 3.9939 for 57 degrees of freedom
# Null hypothesis probability = 2.970657e-22
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.411e-07 1.705e-08
25- 50 7.807e-07 3.222e-08
50-150 7.216e-07 5.759e-08
15-150 1.743e-06 6.826e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 94.1549 (-11.8693 14.8573)
Norm : 4.03633 (-0.233481 0.253822)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.96 using 59 PHA bins.
# Reduced chi-squared = 0.8238 for 57 degrees of freedom
# Null hypothesis probability = 8.261471e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.246e-07 3.093e-08
25- 50 7.251e-07 3.040e-08
50-150 1.135e-06 2.801e-07
15-150 2.284e-06 2.819e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.82277 (-0.72077 0.753752)
R1^2/D10^2 : 1.26855 (-0.393418 0.642931)
kT2 [keV] : 24.7210 (-3.22529 4.52499)
R2^2/D10^2 : 1.01214E-02 (-0.00466563 0.00728273)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.58 using 59 PHA bins.
# Reduced chi-squared = 0.7924 for 55 degrees of freedom
# Null hypothesis probability = 8.665286e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.152e-07 4.567e-08
25- 50 7.296e-07 5.436e-08
50-150 1.187e-06 1.951e-07
15-150 2.332e-06 2.565e-07
Peak spectrum fit
Power-law model
Time interval is from -0.084 sec. to 0.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85509 ( -0.082721 0.0838595 )
Norm@50keV : 4.04215E-02 ( -0.00205946 0.00204803 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.03 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.015885e-01
Photon flux (15-150 keV) in 1 sec: 5.69344 ( -0.278142 0.278613 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.71645e-07 ( -1.89781e-08 1.90533e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.084 sec. to 0.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18119 ( -0.384862 0.349916 )
Epeak [keV] : 56.5654 ( -7.55413 14.6703 )
Norm@50keV : 9.22312E-02 ( -0.0315779 0.0548898 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.31 using 59 PHA bins.
# Reduced chi-squared = 0.8983 for 56 degrees of freedom
# Null hypothesis probability = 6.893004e-01
Photon flux (15-150 keV) in 1 sec: 5.51159 ( -0.29198 0.29233 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.52769e-07 ( -2.1346e-08 2.1376e-08 ) ergs/cm2
Band function
Time interval is from -0.084 sec. to 0.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.468482 ( -0.907075 3.98824 )
beta : -2.13520 ( -0.28455 0.187566 )
Epeak [keV] : 35.9096 ( -10.7848 11.504 )
Norm@50keV : 1.18825 ( -1.16551 283.862 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.41 using 59 PHA bins.
# Reduced chi-squared = 0.8256 for 55 degrees of freedom
# Null hypothesis probability = 8.184496e-01
Photon flux (15-150 keV) in 1 sec: 5.46169 ( 1.53831 -0.29761 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55498e-07 ( -3.55491e-07 -2.0273e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.6473 ( )
R^2/D10^2 : 1.50258 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 127.16 using 59 PHA bins.
# Reduced chi-squared = 2.2308 for 57 degrees of freedom
# Null hypothesis probability = 2.873571e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.298e-08 3.790e-09
25- 50 1.305e-07 7.400e-09
50-150 1.043e-07 1.176e-08
15-150 2.778e-07 1.460e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 91.8818 (-13.7868 17.9929)
Norm : 25.6190 (-0.942756 1.97055)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.38 using 59 PHA bins.
# Reduced chi-squared = 0.8839 for 57 degrees of freedom
# Null hypothesis probability = 7.198167e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.688e-08 5.995e-09
25- 50 1.136e-07 5.300e-09
50-150 1.752e-07 4.935e-08
15-150 3.557e-07 4.825e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.56121 (-0.925776 0.939005)
R1^2/D10^2 : 5.53117 (-1.7505 2.95789)
kT2 [keV] : 25.1245 (-4.3795 6.8588)
R2^2/D10^2 : 5.39547E-02 (-0.0321941 0.0632129)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.19 using 59 PHA bins.
# Reduced chi-squared = 0.8035 for 55 degrees of freedom
# Null hypothesis probability = 8.513780e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.056e-08 7.725e-09
25- 50 1.201e-07 1.777e-08
50-150 1.758e-07 5.996e-08
15-150 3.564e-07 8.260e-08
Plot creation:
Wed Sep 13 10:46:58 EDT 2017