batgrbproduct Analysis for Trigger=686842
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): Fri May 20 04:03:41 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger686842/GCN5_download_cron
======================================================================
Trigger: 00686842 Segment: 000
BAT Trigger Time: 485329302.168 [s; MET]
Trigger Stop: 485329302.176 [s; MET]
UTC: 2016-05-19T05:41:25.878580 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 293.749942771204 Dec: 21.8766926255863 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.01
Image Trigger?: NO
Rate S/N Ratio: 18.4932420089069 [ if not an image trigger ]
Image S/N Ratio: 7.01
Flight Position: [ source = BAT ]
RA: 293.749942771204 Dec: 21.8766926255863 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.715346997134 Dec: 21.8497701881899 [deg; J2000]
{ 19h 34m 51.7s , +21d 50' 59.2" }
+/- 2.95508131017094 [arcmin] (estimated 90% radius based on SNR)
+/- 1.68396646310977 [arcmin] (formal 1-sigma fit error)
SNR: 6.46958360846198
Angular difference between Flight and Ground position is 2.514070 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 0.00800001621246338 +/- 0.0905096828275688
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
T50: 0.00800001621246338 +/- 0.0640000104904175
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.00800001621246338 second)
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006103 0.008889 0.002158 -0.000566
0.001592 0.001885 0.000997 0.000687 [error]
Peak 0.006103 0.008889 0.002158 -0.000566
0.001592 0.001885 0.000997 0.000687 [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 1.96e-09 1.94e-09 1.34e-09 1.47e-09 5.83e-09 6.72e-09 erg/cm2
Error 7.53e-10 6.46e-10 8.15e-10 2.02e-09 2.05e-09 3.03e-09 erg/cm2
Peak flux Power-law 8.09e+00 4.46e+00 1.54e+00 6.98e-01 1.45e+01 1.48e+01 ph/cm2/s
Error 3.16e+00 1.45e+00 9.06e-01 8.95e-01 4.47e+00 4.55e+00 ph/cm2/s
Fluence Cutoff-PL 1.97e-09 2.26e-09 9.92e-10 1.33e-10 5.34e-09 5.36e-09 erg/cm2
Error 8.02e-10 1.10e-09 1.09e-09 1.89e-09 2.07e-09 3.02e-09 erg/cm2
Peak flux Cutoff-PL 8.03e+00 5.21e+00 1.20e+00 8.64e-02 1.45e+01 1.45e+01 ph/cm2/s
Error 3.38e+00 2.52e+00 1.06e+00 8.42e-01 4.55e+00 4.54e+00 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 2.530 0.633 - - 7.23e-02 3.28e-02 33.210 57
CPL 1.194 0.000 20.0 0.0 5.69e-01 0.00e+00 32.900 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.530 0.633 - - 7.23e-02 3.28e-02 33.210 57
CPL 1.194 0.000 20.0 0.0 5.69e-01 0.00e+00 32.900 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.008 0.000 0.008
T90 0.008 0.000 0.008
T50 0.008 0.000 0.008
Peak 0.008 0.000 0.008
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.7153 +21.8498 0.0295 29.8 -137.7 0.0167 6.5 TRIG_00686842
------------------------------------------
Foreground time interval of the image:
0.000 0.008 (delta_t = 0.008 [sec])
Background time interval of the image:
-157.067 -55.739 (delta_t = 101.328 [sec])
-54.168 -6.168 (delta_t = 48.000 [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 0.000 sec. to 0.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52991 ( -0.597064 0.669546 )
Norm@50keV : 7.23139E-02 ( -0.0330446 0.0326273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.21 using 59 PHA bins.
# Reduced chi-squared = 0.5827 for 57 degrees of freedom
# Null hypothesis probability = 9.950685e-01
Photon flux (15-150 keV) in 0.008 sec: 14.4700 ( -4.47423 4.47474 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83266e-09 ( -2.00634e-09 2.0937e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19430 ( )
Epeak [keV] : 20.0195 ( )
Norm@50keV : 0.569206 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.90 using 59 PHA bins.
# Reduced chi-squared = 0.5876 for 56 degrees of freedom
# Null hypothesis probability = 9.941249e-01
Photon flux (15-150 keV) in 0.008 sec: 14.5231 ( -4.53638 4.5628 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.34465e-09 ( -1.70977e-09 2.42543e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.82150 ( 1.8215 1.8215 )
beta : -8.90972 ( 8.50092 18.4856 )
Epeak [keV] : 8.45495 ( -4.49411 -8.43258 )
Norm@50keV : 0.218151 ( -0.0663253 1.33766e+08 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.97 using 59 PHA bins.
# Reduced chi-squared = 0.5995 for 55 degrees of freedom
# Null hypothesis probability = 9.919437e-01
Photon flux (15-150 keV) in 0.008 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] : 7.60723 (-1.64355 1.91191)
R^2/D10^2 : 21.7731 (-14.4516 38.732)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.84 using 59 PHA bins.
# Reduced chi-squared = 0.5937 for 57 degrees of freedom
# Null hypothesis probability = 9.937260e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.751e-09 9.423e-10
25- 50 2.803e-09 1.300e-09
50-150 6.219e-10 4.196e-10
15-150 5.176e-09 2.504e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.1409 (-12.0307 31.9855)
Norm : 123.364 (-61.9474 104.186)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.91 using 59 PHA bins.
# Reduced chi-squared = 0.5774 for 57 degrees of freedom
# Null hypothesis probability = 9.956262e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.978e-09 9.170e-10
25- 50 2.224e-09 1.132e-09
50-150 1.172e-09 8.913e-10
15-150 5.375e-09 2.714e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.80561 (-2.77329 28.042)
R1^2/D10^2 : 812.023 (-915.71 -915.71)
kT2 [keV] : 8.76668 (-2.28003 -8.70246)
R2^2/D10^2 : 9.53923 (-10.068 34.9505)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.62 using 59 PHA bins.
# Reduced chi-squared = 0.5930 for 55 degrees of freedom
# Null hypothesis probability = 9.929542e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.917e-09 1.011e-09
25- 50 2.386e-09 1.460e-09
50-150 8.076e-10 5.424e-10
15-150 5.111e-09 2.670e-09
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52991 ( -0.597064 0.669546 )
Norm@50keV : 7.23139E-02 ( -0.0330446 0.0326273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.21 using 59 PHA bins.
# Reduced chi-squared = 0.5827 for 57 degrees of freedom
# Null hypothesis probability = 9.950685e-01
Photon flux (15-150 keV) in 0.008 sec: 14.4700 ( -4.47423 4.47474 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83266e-09 ( -2.00634e-09 2.0937e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19430 ( )
Epeak [keV] : 20.0195 ( )
Norm@50keV : 0.569206 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.90 using 59 PHA bins.
# Reduced chi-squared = 0.5876 for 56 degrees of freedom
# Null hypothesis probability = 9.941249e-01
Photon flux (15-150 keV) in 0.008 sec: 14.5231 ( -4.53638 4.5628 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.34465e-09 ( -1.70977e-09 2.42543e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.82150 ( 1.8215 1.8215 )
beta : -8.90972 ( 8.50092 18.4856 )
Epeak [keV] : 8.45495 ( -4.49411 -8.43258 )
Norm@50keV : 0.218151 ( -0.0663253 1.33766e+08 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.97 using 59 PHA bins.
# Reduced chi-squared = 0.5995 for 55 degrees of freedom
# Null hypothesis probability = 9.919437e-01
Photon flux (15-150 keV) in 0.008 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] : 7.60723 (-1.64355 1.91191)
R^2/D10^2 : 21.7731 (-14.4516 38.732)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.84 using 59 PHA bins.
# Reduced chi-squared = 0.5937 for 57 degrees of freedom
# Null hypothesis probability = 9.937260e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.751e-09 9.694e-10
25- 50 2.803e-09 1.542e-09
50-150 6.219e-10 4.640e-10
15-150 5.176e-09 2.584e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.1409 (-12.0307 31.9855)
Norm : 123.364 (-61.9474 104.186)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.91 using 59 PHA bins.
# Reduced chi-squared = 0.5774 for 57 degrees of freedom
# Null hypothesis probability = 9.956262e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.978e-09 9.226e-10
25- 50 2.224e-09 9.871e-10
50-150 1.172e-09 8.824e-10
15-150 5.375e-09 2.578e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.80561 (-2.77329 28.042)
R1^2/D10^2 : 812.023 (-915.71 -915.71)
kT2 [keV] : 8.76668 (-2.28003 -8.70246)
R2^2/D10^2 : 9.53923 (-10.068 34.9505)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.62 using 59 PHA bins.
# Reduced chi-squared = 0.5930 for 55 degrees of freedom
# Null hypothesis probability = 9.929542e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.917e-09 9.460e-10
25- 50 2.386e-09 1.406e-09
50-150 8.076e-10 5.348e-10
15-150 5.111e-09 2.791e-09
Plot creation:
Fri May 20 04:09:30 EDT 2016