batgrbproduct Analysis for Trigger=686818
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 03:07:30 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger686818/GCN5_download_cron
======================================================================
Trigger: 00686818 Segment: 000
BAT Trigger Time: 485309869.824 [s; MET]
Trigger Stop: 485309870.336 [s; MET]
UTC: 2016-05-19T00:17:33.535660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 71.1133226475316 Dec: 31.1966191090885 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 8.36660026534076 [ if not an image trigger ]
Image S/N Ratio: 7.39
Flight Position: [ source = BAT ]
RA: 71.1133226475316 Dec: 31.1966191090885 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 71.1215205223674 Dec: 31.2461291991568 [deg; J2000]
{ 04h 44m 29.2s , +31d 14' 46.1" }
+/- 2.21469758966124 [arcmin] (estimated 90% radius based on SNR)
+/- 0.969097782659795 [arcmin] (formal 1-sigma fit error)
SNR: 9.76814386220191
Angular difference between Flight and Ground position is 3.000238 arcmin
Partial Coding Fraction: 0.1972656 [ including projection effects ]
Duration
T90: 35.5680000185966 +/- 6.11085331802475
Measured from: -0.495999872684479
to: 35.0720001459122 [s; relative to TRIGTIME]
T50: 24.5760000348091 +/- 7.50118495081009
Measured from: 0.960000097751617
to: 25.5360001325607 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.156000018119812
to: 0.843999981880188 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.991999983787537
to: 41.1200000047684 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.599188 0.840102 0.422552 0.081580
0.093599 0.096608 0.081757 0.069291 [error]
Peak 0.074791 0.110873 0.078021 0.044071
0.016446 0.018155 0.015163 0.012088 [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 2.50e-07 3.50e-07 3.63e-07 6.90e-07 1.18e-06 1.65e-06 erg/cm2
Error 4.98e-08 4.79e-08 8.09e-08 3.07e-07 1.89e-07 3.93e-07 erg/cm2
Peak flux Power-law 8.51e-01 8.07e-01 5.32e-01 5.45e-01 2.41e+00 2.74e+00 ph/cm2/s
Error 2.59e-01 1.55e-01 1.24e-01 2.57e-01 4.50e-01 4.97e-01 ph/cm2/s
Fluence Cutoff-PL 2.42e-07 3.67e-07 3.62e-07 3.72e-07 1.15e-06 1.34e-06 erg/cm2
Error 5.57e-08 6.45e-08 8.79e-08 5.03e-07 2.11e-07 5.33e-07 erg/cm2
Peak flux Cutoff-PL 8.51e-01 8.08e-01 5.32e-01 5.41e-01 2.41e+00 2.73e+00 ph/cm2/s
Error 2.70e-01 1.47e-01 1.30e-01 4.27e-01 4.48e-01 5.05e-01 ph/cm2/s
Fluence Band 2.39e-07 3.68e-07 3.56e-07 4.94e-07 1.14e-06 1.47e-06 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 1.949 0.251 - - 3.05e-03 5.00e-04 37.240 57
CPL 1.587 0.913 49.8 0.0 4.88e-03 0.00e+00 36.870 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.601 0.313 - - 1.88e-02 3.52e-03 46.900 57
CPL 1.606 0.315 9999.4 0.0 1.88e-02 2.87e-02 46.900 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: 1.920000 sec.
T50 in the 50-300 keV band: 0.704000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 42.112 -0.992 41.120
T90 35.568 -0.496 35.072
T50 24.576 0.960 25.536
Peak 1.000 -0.156 0.844
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
71.1215 +31.2461 0.0197 41.5 -55.3 1.9558 9.8 TRIG_00686818
------------------------------------------
Foreground time interval of the image:
-0.992 41.120 (delta_t = 42.112 [sec])
Background time interval of the image:
-239.824 -0.992 (delta_t = 238.832 [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 -0.992 sec. to 41.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94862 ( -0.243417 0.259325 )
Norm@50keV : 3.04914E-03 ( -0.00050746 0.000492601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.24 using 59 PHA bins.
# Reduced chi-squared = 0.6533 for 57 degrees of freedom
# Null hypothesis probability = 9.802005e-01
Photon flux (15-150 keV) in 42.11 sec: 0.446897 ( -0.0616444 0.0616896 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18158e-06 ( -1.86843e-07 1.90171e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.992 sec. to 41.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58673 ( -1.23753 0.588276 )
Epeak [keV] : 49.8100 ( )
Norm@50keV : 4.88199E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.87 using 59 PHA bins.
# Reduced chi-squared = 0.6584 for 56 degrees of freedom
# Null hypothesis probability = 9.774031e-01
Photon flux (15-150 keV) in 42.11 sec: 0.441493 ( -0.06367 0.063413 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14535e-06 ( -2.10171e-07 2.12588e-07 ) ergs/cm2
Band function
Time interval is from -0.992 sec. to 41.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48963 ( 1.48959 6.26451 )
beta : -2.30501 ( 2.25179 0.520933 )
Epeak [keV] : 47.8394 ( -47.4273 -47.4273 )
Norm@50keV : 5.54721E-03 ( -0.00289241 403.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.69 using 59 PHA bins.
# Reduced chi-squared = 0.6671 for 55 degrees of freedom
# Null hypothesis probability = 9.727719e-01
Photon flux (15-150 keV) in 42.11 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14431e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7330 (-1.67218 1.94842)
R^2/D10^2 : 0.159902 (-0.0753034 0.144878)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.58 using 59 PHA bins.
# Reduced chi-squared = 0.8523 for 57 degrees of freedom
# Null hypothesis probability = 7.787270e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.612e-07 3.716e-08
25- 50 4.415e-07 8.982e-08
50-150 2.818e-07 9.369e-08
15-150 8.845e-07 1.779e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 74.9437 (-26.1107 53.1562)
Norm : 2.14550 (-0.427377 0.536753)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.04 using 59 PHA bins.
# Reduced chi-squared = 0.6498 for 57 degrees of freedom
# Null hypothesis probability = 9.813743e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.333e-07 4.834e-08
25- 50 3.779e-07 5.767e-08
50-150 5.100e-07 2.420e-07
15-150 1.121e-06 2.583e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.71840 (-2.05638 3.95362)
R1^2/D10^2 : 2.28819 (-1.92799 31.3889)
kT2 [keV] : 16.1123 (-4.27319 33.402)
R2^2/D10^2 : 2.66479E-02 (-0.0259726 0.0707568)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.73 using 59 PHA bins.
# Reduced chi-squared = 0.6861 for 55 degrees of freedom
# Null hypothesis probability = 9.635671e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.449e-07 1.330e-07
25- 50 3.589e-07 1.851e-07
50-150 4.663e-07 2.809e-07
15-150 1.070e-06 5.457e-07
Peak spectrum fit
Power-law model
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60096 ( -0.309398 0.317323 )
Norm@50keV : 1.87736E-02 ( -0.00354529 0.00349665 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.90 using 59 PHA bins.
# Reduced chi-squared = 0.8228 for 57 degrees of freedom
# Null hypothesis probability = 8.276771e-01
Photon flux (15-150 keV) in 1 sec: 2.41322 ( -0.449018 0.450079 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75554e-07 ( -3.49708e-08 3.52889e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60595 ( -0.315787 0.31487 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.87662E-02 ( -0.00353562 0.0538125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.90 using 59 PHA bins.
# Reduced chi-squared = 0.8375 for 56 degrees of freedom
# Null hypothesis probability = 8.015792e-01
Photon flux (15-150 keV) in 1 sec: 2.41291 ( -0.44886 0.44761 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75461e-07 ( -1.7959e-08 3.5245e-08 ) ergs/cm2
Band function
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.39727 ( 1.00166 1.00166 )
beta : -1.69612 ( 1.64551 0.344496 )
Epeak [keV] : 29.4770 ( -38.4045 271.032 )
Norm@50keV : 2.90101 ( -2.77403 1156.51 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.58 using 59 PHA bins.
# Reduced chi-squared = 0.8468 for 55 degrees of freedom
# Null hypothesis probability = 7.834540e-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] : 13.1172 (-2.83404 3.9835)
R^2/D10^2 : 0.431405 (-0.267608 0.612048)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.50 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.566742e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.574e-08 5.614e-09
25- 50 5.474e-08 1.959e-08
50-150 5.986e-08 2.411e-08
15-150 1.303e-07 3.800e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 189.384 (-105.543 -189.001)
Norm : 9.81965 (-1.80427 2.37665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.27 using 59 PHA bins.
# Reduced chi-squared = 0.8293 for 57 degrees of freedom
# Null hypothesis probability = 8.173578e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.461e-08 1.397e-08
25- 50 4.706e-08 2.602e-08
50-150 1.014e-07 5.625e-08
15-150 1.731e-07 9.580e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.97363 (-3.06672 3.59104)
R1^2/D10^2 : 2.01109 (-1.42932 9.19827)
kT2 [keV] : 40.2174 (-35.3424 -40.253)
R2^2/D10^2 : 6.93944E-03 (-0.00673632 0.066978)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.36 using 59 PHA bins.
# Reduced chi-squared = 0.8429 for 55 degrees of freedom
# Null hypothesis probability = 7.901751e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.451e-08 1.443e-08
25- 50 4.999e-08 2.785e-08
50-150 1.053e-07 5.845e-08
15-150 1.798e-07 9.255e-08
Plot creation:
Fri May 20 03:12:34 EDT 2016