batgrbproduct Analysis for Trigger=670793
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Mon Jan 18 09:21:46 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger670793/GCN5_download_cron
======================================================================
Trigger: 00670793 Segment: 000
BAT Trigger Time: 474718368 [s; MET]
Trigger Stop: 474718432 [s; MET]
UTC: 2016-01-17T10:12:32.290060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 20.3799940195987 Dec: -0.640262519697645 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.99
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.99
Flight Position: [ source = BAT ]
RA: 20.3799940195987 Dec: -0.640262519697645 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 20.3641732438532 Dec: -0.677714457229221 [deg; J2000]
{ 01h 21m 27.4s , -00d 40' 39.8" }
+/- 1.78485166025988 [arcmin] (estimated 90% radius based on SNR)
+/- 0.740210804210068 [arcmin] (formal 1-sigma fit error)
SNR: 13.2949518619878
Angular difference between Flight and Ground position is 2.439361 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 119.079999983311 +/- 19.9287057144617
Measured from: -16.9239999055862
to: 102.156000077724 [s; relative to TRIGTIME]
T50: 28.2519999742508 +/- 4.53484467490491
Measured from: 62.4320001006126
to: 90.6840000748634 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 76.1679999828339
to: 77.1679999828339 [s; relative to TRIGTIME]
Total Fluence
Measured from: -46
to: 109.019999980927 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.409246 2.296065 1.011902 0.165291
0.098337 0.100871 0.085525 0.072213 [error]
Peak 0.061064 0.065033 0.028491 0.001001
0.008931 0.009095 0.007197 0.005739 [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 7.79e-07 9.72e-07 8.82e-07 1.39e-06 3.11e-06 4.03e-06 erg/cm2
Error 6.38e-08 5.24e-08 8.47e-08 2.69e-07 1.91e-07 3.57e-07 erg/cm2
Peak flux Power-law 6.15e-01 4.44e-01 2.12e-01 1.43e-01 1.34e+00 1.41e+00 ph/cm2/s
Error 1.31e-01 7.29e-02 5.74e-02 7.07e-02 2.17e-01 2.33e-01 ph/cm2/s
Fluence Cutoff-PL 7.56e-07 1.00e-06 8.65e-07 7.82e-07 3.00e-06 3.41e-06 erg/cm2
Error 7.15e-08 6.82e-08 9.38e-08 6.31e-07 2.37e-07 6.46e-07 erg/cm2
Peak flux Cutoff-PL 5.54e-01 5.40e-01 1.92e-01 1.99e-02 1.30e+00 1.31e+00 ph/cm2/s
Error 1.48e-01 1.10e-01 9.35e-02 5.02e-02 2.17e-01 2.20e-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 2.140 0.110 - - 2.15e-03 1.47e-04 48.780 57
CPL 1.828 0.370 22.8 0.0 3.25e-03 0.00e+00 47.180 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.066 0.283 - - 8.65e-03 1.82e-03 47.970 57
CPL 0.412 1.656 37.3 14.6 8.73e-02 6.90e-01 43.620 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: 32.448000 sec.
T50 in the 50-300 keV band: 17.856000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 155.020 -46.000 109.020
T90 119.080 -16.924 102.156
T50 28.252 62.432 90.684
Peak 1.000 76.168 77.168
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
20.3642 -0.6777 0.0144 25.7 138.0 6.0598 13.3 TRIG_00670793
------------------------------------------
Foreground time interval of the image:
-46.000 109.020 (delta_t = 155.020 [sec])
Background time interval of the image:
-78.499 -46.000 (delta_t = 32.499 [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 -46.000 sec. to 109.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13995 ( -0.108186 0.110994 )
Norm@50keV : 2.15141E-03 ( -0.000148155 0.000146356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.78 using 59 PHA bins.
# Reduced chi-squared = 0.8557 for 57 degrees of freedom
# Null hypothesis probability = 7.725824e-01
Photon flux (15-150 keV) in 155 sec: 0.345302 ( -0.0190851 0.0191146 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11138e-06 ( -1.90321e-07 1.92175e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -46.000 sec. to 109.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82819 ( -0.472394 0.268431 )
Epeak [keV] : 22.8438 ( )
Norm@50keV : 3.24917E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.18 using 59 PHA bins.
# Reduced chi-squared = 0.8425 for 56 degrees of freedom
# Null hypothesis probability = 7.931842e-01
Photon flux (15-150 keV) in 155 sec: 0.339440 ( -0.020573 0.020566 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00443e-06 ( -2.34748e-07 2.38576e-07 ) ergs/cm2
Band function
Time interval is from -46.000 sec. to 109.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.82911 ( -2.28785 -0.545533 )
beta : -2.26189 ( -0.188412 0.153092 )
Epeak [keV] : 23.5162 ( -5.18689 6.44863 )
Norm@50keV : 2.13800 ( -2.14615 306.062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.51 using 59 PHA bins.
# Reduced chi-squared = 0.7910 for 55 degrees of freedom
# Null hypothesis probability = 8.682982e-01
Photon flux (15-150 keV) in 155 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] : 9.29694 ( )
R^2/D10^2 : 0.199682 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 117.74 using 59 PHA bins.
# Reduced chi-squared = 2.0656 for 57 degrees of freedom
# Null hypothesis probability = 4.068301e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.292e-07 4.991e-08
25- 50 1.182e-06 7.192e-08
50-150 4.977e-07 7.300e-08
15-150 2.209e-06 1.387e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 54.7419 (-8.43433 10.5111)
Norm : 1.85022 (-0.188584 0.151581)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.13 using 59 PHA bins.
# Reduced chi-squared = 0.8795 for 57 degrees of freedom
# Null hypothesis probability = 7.284937e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.090e-07 4.131e-08
25- 50 1.048e-06 1.100e-07
50-150 1.102e-06 3.076e-07
15-150 2.859e-06 4.727e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.71537 (-0.843946 0.910662)
R1^2/D10^2 : 1.04819 (-0.435824 0.878256)
kT2 [keV] : 19.7155 (-3.86694 6.31264)
R2^2/D10^2 : 7.12854E-03 (-0.00463244 0.0103342)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.27 using 59 PHA bins.
# Reduced chi-squared = 0.8413 for 55 degrees of freedom
# Null hypothesis probability = 7.928760e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.387e-07 1.169e-07
25- 50 9.976e-07 1.542e-07
50-150 1.225e-06 4.857e-07
15-150 2.961e-06 6.603e-07
Peak spectrum fit
Power-law model
Time interval is from 76.168 sec. to 77.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06591 ( -0.270687 0.296022 )
Norm@50keV : 8.64916E-03 ( -0.00184129 0.0017945 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.97 using 59 PHA bins.
# Reduced chi-squared = 0.8417 for 57 degrees of freedom
# Null hypothesis probability = 7.970732e-01
Photon flux (15-150 keV) in 1 sec: 1.33829 ( -0.21749 0.217491 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.01142e-08 ( -1.54711e-08 1.59402e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 76.168 sec. to 77.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.412099 ( -1.92413 1.38804 )
Epeak [keV] : 37.2584 ( -15.499 13.6108 )
Norm@50keV : 8.72562E-02 ( -0.0877796 1.29142 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.62 using 59 PHA bins.
# Reduced chi-squared = 0.7789 for 56 degrees of freedom
# Null hypothesis probability = 8.858605e-01
Photon flux (15-150 keV) in 1 sec: 1.30393 ( -0.21663 0.21807 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.09434e-08 ( -1.44548e-08 1.66264e-08 ) ergs/cm2
Band function
Time interval is from 76.168 sec. to 77.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.462751 ( -1.11426 0.665905 )
beta : -9.99998 ( 9.99998 20 )
Epeak [keV] : 37.2978 ( -8.42298 13.5876 )
Norm@50keV : 8.11679E-02 ( -0.0129189 0.0889655 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.62 using 59 PHA bins.
# Reduced chi-squared = 0.7932 for 55 degrees of freedom
# Null hypothesis probability = 8.654668e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.55624e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.42565 (-1.49593 1.723)
R^2/D10^2 : 0.833490 (-0.40156 0.785237)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8176 for 57 degrees of freedom
# Null hypothesis probability = 8.356949e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.474e-08 4.303e-09
25- 50 3.362e-08 8.865e-09
50-150 1.475e-08 5.883e-09
15-150 6.311e-08 1.502e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.1294 (-18.6674 34.6805)
Norm : 7.47939 (-1.76454 2.24983)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.66 using 59 PHA bins.
# Reduced chi-squared = 0.7835 for 57 degrees of freedom
# Null hypothesis probability = 8.826086e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.852e-08 4.130e-09
25- 50 2.743e-08 5.495e-09
50-150 2.903e-08 1.348e-08
15-150 7.498e-08 2.016e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.45303 (-3.59913 -5.45272)
R1^2/D10^2 : 3.57480 (-3.14203 394.339)
kT2 [keV] : 13.4189 (-7.45058 -13.4186)
R2^2/D10^2 : 0.145037 (-0.144688 0.463545)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.33 using 59 PHA bins.
# Reduced chi-squared = 0.7878 for 55 degrees of freedom
# Null hypothesis probability = 8.725079e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.768e-08 9.865e-09
25- 50 2.948e-08 1.541e-08
50-150 2.344e-08 1.438e-08
15-150 7.060e-08 3.621e-08
Plot creation:
Mon Jan 18 09:27:15 EST 2016