batgrbproduct analysis for trigger=768939
batgrbproduct Analysis for Trigger=768939
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 Aug 23 11:33:55 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger768939/GCN5_download_cron
======================================================================
Trigger: 00768939 Segment: 000
BAT Trigger Time: 525085930.624 [s; MET]
Trigger Stop: 525085934.72 [s; MET]
UTC: 2017-08-22T09:11:51.057700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 94.3820902752538 Dec: 55.0186424017826 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.48
Image Trigger?: NO
Rate S/N Ratio: 28.6705423736629 [ if not an image trigger ]
Image S/N Ratio: 15.48
Flight Position: [ source = BAT ]
RA: 94.3820902752538 Dec: 55.0186424017826 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 94.3752590695983 Dec: 54.9998193399018 [deg; J2000]
{ 06h 17m 30.1s , +54d 59' 59.3" }
+/- 2.07485973925034 [arcmin] (estimated 90% radius based on SNR)
+/- 0.719045659655939 [arcmin] (formal 1-sigma fit error)
SNR: 10.7220373952185
Angular difference between Flight and Ground position is 1.153582 arcmin
Partial Coding Fraction: 0.1210938 [ including projection effects ]
Duration
T90: 64 +/- 16
Measured from: -15.6239998936653
to: 48.3760001063347 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: 0.376000106334686
to: 32.3760001063347 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.8759999871254
to: 8.8759999871254 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.6240000128746
to: 64.3759999871254 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.159130 4.048928 2.559787 0.386297
0.172534 0.182217 0.154385 0.124786 [error]
Peak 0.131376 0.189485 0.142862 -0.010494
0.024043 0.025495 0.022658 0.014923 [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 1.18e-06 1.81e-06 2.07e-06 4.55e-06 6.41e-06 9.61e-06 erg/cm2
Error 1.03e-07 9.80e-08 1.54e-07 7.05e-07 3.68e-07 8.37e-07 erg/cm2
Peak flux Power-law 1.59e+00 1.42e+00 8.70e-01 8.08e-01 4.23e+00 4.69e+00 ph/cm2/s
Error 3.74e-01 2.21e-01 1.78e-01 3.18e-01 6.53e-01 7.17e-01 ph/cm2/s
Fluence Cutoff-PL 1.10e-06 1.90e-06 2.12e-06 2.34e-06 6.21e-06 7.46e-06 erg/cm2
Error 1.20e-07 1.20e-07 1.67e-07 1.19e-06 4.00e-07 1.24e-06 erg/cm2
Peak flux Cutoff-PL 1.41e+00 1.55e+00 9.34e-01 3.71e-01 4.14e+00 4.26e+00 ph/cm2/s
Error 4.35e-01 2.78e-01 2.08e-01 4.08e-01 6.63e-01 7.62e-01 ph/cm2/s
Fluence Band 1.06e-06 1.93e-06 2.03e-06 3.88e-06 6.26e-06 8.92e-06 erg/cm2
Error 1.32e-07 1.38e-07 1.62e-07 -------- 3.84e-07 -------- erg/cm2
Peak flux Band 1.42e+00 1.53e+00 9.36e-01 4.12e-01 4.15e+00 4.30e+00 ph/cm2/s
Error 3.14e-01 -------- -------- -------- 6.38e-01 7.44e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.801 0.094 - - 8.71e-03 4.89e-04 64.220 57
CPL 1.329 0.376 69.0 37.4 1.53e-02 7.00e-03 59.010 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.707 0.249 - - 3.17e-02 5.18e-03 47.580 57
CPL 0.905 1.041 66.8 -24.8 8.31e-02 1.65e-01 45.460 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: 58.496000 sec.
T50 in the 50-300 keV band: 40.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 80.000 -15.624 64.376
T90 64.000 -15.624 48.376
T50 32.000 0.376 32.376
Peak 1.000 7.876 8.876
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
94.3753 +54.9998 0.0181 41.8 -61.6 11.2888 10.7 TRIG_00768939
------------------------------------------
Foreground time interval of the image:
-15.624 64.376 (delta_t = 80.000 [sec])
Background time interval of the image:
-239.624 -210.394 (delta_t = 29.230 [sec])
-209.624 -15.624 (delta_t = 194.000 [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 -15.624 sec. to 64.376 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80119 ( -0.093205 0.0944637 )
Norm@50keV : 8.70638E-03 ( -0.000490506 0.000487862 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.22 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 57 degrees of freedom
# Null hypothesis probability = 2.383795e-01
Photon flux (15-150 keV) in 80 sec: 1.20028 ( -0.066546 0.0666785 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.41183e-06 ( -3.67152e-07 3.68536e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.624 sec. to 64.376 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32865 ( -0.392091 0.359209 )
Epeak [keV] : 69.0355 ( -13.549 61.3123 )
Norm@50keV : 1.52675E-02 ( -0.00518683 0.00881264 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.01 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 56 degrees of freedom
# Null hypothesis probability = 3.661658e-01
Photon flux (15-150 keV) in 80 sec: 1.17234 ( -0.06959 0.06968 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.20865e-06 ( -3.99768e-07 4.0004e-07 ) ergs/cm2
Band function
Time interval is from -15.624 sec. to 64.376 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32860 ( -0.315223 0.270621 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 69.0210 ( -13.5418 61.3043 )
Norm@50keV : 1.52665E-02 ( -0.00518747 0.00881766 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.01 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Null hypothesis probability = 3.312621e-01
Photon flux (15-150 keV) in 80 sec: 1.16985 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.25969e-06 ( -6.25913e-06 -3.83136e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.7952 ( )
R^2/D10^2 : 0.223515 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 141.60 using 59 PHA bins.
# Reduced chi-squared = 2.4843 for 57 degrees of freedom
# Null hypothesis probability = 3.769873e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.209e-07 6.392e-08
25- 50 2.102e-06 1.412e-07
50-150 2.155e-06 2.388e-07
15-150 4.878e-06 2.968e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 109.992 (-21.0579 25.3099)
Norm : 5.13375 (-0.366319 0.455311)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.07 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 3.997393e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.073e-06 9.920e-08
25- 50 1.889e-06 1.268e-07
50-150 3.225e-06 8.796e-07
15-150 6.186e-06 9.936e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.54991 (-0.956995 1.04077)
R1^2/D10^2 : 1.80064 (-0.727125 1.41059)
kT2 [keV] : 22.8091 (-3.23894 4.62521)
R2^2/D10^2 : 1.94763E-02 (-0.00996767 0.0165398)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.69 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 55 degrees of freedom
# Null hypothesis probability = 4.487429e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.069e-06 1.864e-07
25- 50 1.902e-06 2.580e-07
50-150 3.239e-06 6.856e-07
15-150 6.211e-06 1.065e-06
Peak spectrum fit
Power-law model
Time interval is from 7.876 sec. to 8.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70703 ( -0.243973 0.254734 )
Norm@50keV : 3.17417E-02 ( -0.00521574 0.00513632 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.58 using 59 PHA bins.
# Reduced chi-squared = 0.8348 for 57 degrees of freedom
# Null hypothesis probability = 8.085692e-01
Photon flux (15-150 keV) in 1 sec: 4.22606 ( -0.652964 0.653781 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93731e-07 ( -4.97344e-08 5.02893e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.876 sec. to 8.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.904699 ( -1.17934 0.901973 )
Epeak [keV] : 66.8377 ( -17.3318 -66.8383 )
Norm@50keV : 8.31020E-02 ( -0.0831006 0.246579 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.46 using 59 PHA bins.
# Reduced chi-squared = 0.8117 for 56 degrees of freedom
# Null hypothesis probability = 8.419947e-01
Photon flux (15-150 keV) in 1 sec: 4.14078 ( -0.66294 0.66263 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.83324e-07 ( -5.0972e-08 5.1912e-08 ) ergs/cm2
Band function
Time interval is from 7.876 sec. to 8.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.905247 ( -0.727663 1.30693 )
beta : -10.0000 ( 10 2.8777e-13 )
Epeak [keV] : 66.8419 ( -19.6593 -66.8419 )
Norm@50keV : 8.30415E-02 ( -0.0830411 0.246751 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.46 using 59 PHA bins.
# Reduced chi-squared = 0.8265 for 55 degrees of freedom
# Null hypothesis probability = 8.170324e-01
Photon flux (15-150 keV) in 1 sec: 4.15209 ( 2.84791 -0.63353 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86421e-07 ( -2.86414e-07 -5.4196e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.7174 (-2.30587 2.70773)
R^2/D10^2 : 0.662117 (-0.321364 0.625869)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
# Reduced chi-squared = 0.9485 for 57 degrees of freedom
# Null hypothesis probability = 5.859591e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.636e-08 7.780e-09
25- 50 9.606e-08 2.224e-08
50-150 1.178e-07 3.783e-08
15-150 2.402e-07 5.135e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 130.516 (-54.85 -128.81)
Norm : 17.8691 (-3.10325 4.039)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.89 using 59 PHA bins.
# Reduced chi-squared = 0.8051 for 57 degrees of freedom
# Null hypothesis probability = 8.539612e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.635e-08 1.345e-08
25- 50 8.410e-08 3.805e-08
50-150 1.562e-07 9.787e-08
15-150 2.867e-07 1.521e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.91439 (-2.68257 3.69547)
R1^2/D10^2 : 7.90189 (-6.26885 84.1461)
kT2 [keV] : 20.2861 (-5.48409 12.8779)
R2^2/D10^2 : 0.124229 (-0.107039 0.323868)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.84 using 59 PHA bins.
# Reduced chi-squared = 0.8153 for 55 degrees of freedom
# Null hypothesis probability = 8.342186e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.576e-08 2.687e-08
25- 50 8.402e-08 4.439e-08
50-150 1.536e-07 8.885e-08
15-150 2.834e-07 1.483e-07
Plot creation:
Wed Aug 23 11:52:04 EDT 2017