batgrbproduct Analysis for Trigger=672236
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 Feb 1 03:34:50 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger672236/GCN5_download_cron
======================================================================
Trigger: 00672236 Segment: 000
BAT Trigger Time: 475921247.744 [s; MET]
Trigger Stop: 475921248.768 [s; MET]
UTC: 2016-01-31T08:20:31.969040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 78.1817178167953 Dec: -7.06755751563068 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.32
Image Trigger?: NO
Rate S/N Ratio: 11.6619037896906 [ if not an image trigger ]
Image S/N Ratio: 7.32
Flight Position: [ source = BAT ]
RA: 78.1817178167953 Dec: -7.06755751563068 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 78.1701937585345 Dec: -7.0369867939343 [deg; J2000]
{ 05h 12m 40.8s , -07d 02' 13.2" }
+/- 1.13098919164669 [arcmin] (estimated 90% radius based on SNR)
+/- 0.400327167327775 [arcmin] (formal 1-sigma fit error)
SNR: 25.512273329946
Angular difference between Flight and Ground position is 1.958401 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 291.651999950409 +/- 69.3192435349767
Measured from: 12.8120000958443
to: 304.464000046253 [s; relative to TRIGTIME]
T50: 64.6959999799728 +/- 5.00711967549954
Measured from: 21.0480000972748
to: 85.7440000772476 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 15.972000002861
to: 16.972000002861 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.49200004339218
to: 773.032000005245 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.917545 10.681741 9.555737 3.264532
0.198207 0.209356 0.185862 0.160260 [error]
Peak 0.156403 0.282026 0.280154 0.118758
0.011483 0.014353 0.014803 0.012313 [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 2.03e-06 4.38e-06 7.44e-06 2.91e-05 2.04e-05 4.29e-05 erg/cm2
Error 1.06e-07 1.32e-07 1.94e-07 1.84e-06 4.94e-07 1.90e-06 erg/cm2
Peak flux Power-law 1.51e+00 1.96e+00 1.87e+00 3.15e+00 6.38e+00 8.48e+00 ph/cm2/s
Error 1.61e-01 1.25e-01 1.18e-01 4.34e-01 3.49e-01 5.24e-01 ph/cm2/s
Fluence Cutoff-PL 2.03e-06 4.39e-06 7.45e-06 2.88e-05 2.04e-05 4.27e-05 erg/cm2
Error 8.84e-08 1.31e-07 1.93e-07 1.94e-06 4.86e-07 2.22e-06 erg/cm2
Peak flux Cutoff-PL 1.51e+00 1.96e+00 1.87e+00 3.13e+00 6.38e+00 8.46e+00 ph/cm2/s
Error 1.81e-01 1.32e-01 1.30e-01 7.65e-01 3.56e-01 8.24e-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 1.236 0.045 - - 2.63e-03 6.20e-05 53.870 57
CPL 1.230 0.066 9996.4 0.0 2.64e-03 1.66e-04 53.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.070 0.097 - - 5.52e-02 2.98e-03 42.710 57
CPL 1.065 0.278 9998.2 0.0 5.55e-02 1.49e-02 42.710 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: 180.224000 sec.
T50 in the 50-300 keV band: 46.272000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 774.524 -1.492 773.032
T90 291.652 12.812 304.464
T50 64.696 21.048 85.744
Peak 1.000 15.972 16.972
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
78.1702 -7.0370 0.0075 23.8 -92.9 1.8521 25.5 TRIG_00672236
------------------------------------------
Foreground time interval of the image:
-1.492 13.357 (delta_t = 14.849 [sec])
Background time interval of the image:
-239.744 -1.492 (delta_t = 238.252 [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 -1.492 sec. to 773.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23570 ( -0.0453004 0.0450814 )
Norm@50keV : 2.62600E-03 ( -6.21068e-05 6.19919e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.87 using 59 PHA bins.
# Reduced chi-squared = 0.9452 for 57 degrees of freedom
# Null hypothesis probability = 5.931064e-01
Photon flux (15-150 keV) in 774.5 sec: 0.309877 ( -0.00805989 0.00809602 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04322e-05 ( -4.93157e-07 4.93954e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.492 sec. to 773.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23023 ( -0.0874041 0.0454548 )
Epeak [keV] : 9996.35 ( -9998.94 -9998.94 )
Norm@50keV : 2.63652E-03 ( -6.13546e-05 0.000270516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.96 using 59 PHA bins.
# Reduced chi-squared = 0.9635 for 56 degrees of freedom
# Null hypothesis probability = 5.525298e-01
Photon flux (15-150 keV) in 774.5 sec: 0.309719 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04325e-05 ( -4.88555e-07 4.8352e-07 ) ergs/cm2
Band function
Time interval is from -1.492 sec. to 773.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.843486 ( 0.845838 0.845838 )
beta : -1.24693 ( -0.0627475 0.0537669 )
Epeak [keV] : 91.6886 ( -93.5052 422.989 )
Norm@50keV : 4.72797E-03 ( -0.0020749 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.58 using 59 PHA bins.
# Reduced chi-squared = 0.9741 for 55 degrees of freedom
# Null hypothesis probability = 5.291978e-01
Photon flux (15-150 keV) in 774.5 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] : 20.6096 ( )
R^2/D10^2 : 1.23132E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 449.49 using 59 PHA bins.
# Reduced chi-squared = 7.8857 for 57 degrees of freedom
# Null hypothesis probability = 2.314466e-62
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.714e-07 3.737e-08
25- 50 3.918e-06 1.526e-07
50-150 1.238e-05 4.647e-07
15-150 1.707e-05 4.724e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.33242 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 230.87 using 59 PHA bins.
# Reduced chi-squared = 4.0503 for 57 degrees of freedom
# Null hypothesis probability = 8.701311e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.570e-06 7.125e-08
25- 50 4.943e-06 1.193e-07
50-150 1.084e-05 2.672e-07
15-150 1.835e-05 4.802e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.73528 (-0.765104 0.820601)
R1^2/D10^2 : 0.136377 (-0.0335908 0.0476227)
kT2 [keV] : 38.1748 (-3.98769 5.5181)
R2^2/D10^2 : 1.43847E-03 (-0.000475939 0.000595522)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.18 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Null hypothesis probability = 3.592121e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.760e-06 1.576e-07
25- 50 4.586e-06 2.238e-07
50-150 1.422e-05 1.065e-06
15-150 2.056e-05 1.139e-06
Peak spectrum fit
Power-law model
Time interval is from 15.972 sec. to 16.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06986 ( -0.0973173 0.0968006 )
Norm@50keV : 5.51647E-02 ( -0.00297638 0.00297636 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.71 using 59 PHA bins.
# Reduced chi-squared = 0.7494 for 57 degrees of freedom
# Null hypothesis probability = 9.201128e-01
Photon flux (15-150 keV) in 1 sec: 6.38137 ( -0.348436 0.348634 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.82428e-07 ( -3.63169e-08 3.65056e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.972 sec. to 16.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06469 ( -0.323154 0.233761 )
Epeak [keV] : 9998.22 ( -9998.17 -9998.17 )
Norm@50keV : 5.54740E-02 ( -0.00299303 0.0268411 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.71 using 59 PHA bins.
# Reduced chi-squared = 0.7627 for 56 degrees of freedom
# Null hypothesis probability = 9.044645e-01
Photon flux (15-150 keV) in 1 sec: 6.38002 ( -0.36403 0.3471 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.80878e-07 ( -3.7709e-08 3.8355e-08 ) ergs/cm2
Band function
Time interval is from 15.972 sec. to 16.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.510788 ( 0.721937 4.02645 )
beta : -1.12994 ( 1.11378 0.130668 )
Epeak [keV] : 97.4953 ( -99.8033 289.397 )
Norm@50keV : 0.119373 ( -0.0620376 10044.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.15 using 59 PHA bins.
# Reduced chi-squared = 0.7663 for 55 degrees of freedom
# Null hypothesis probability = 8.982346e-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] : 19.9882 ( )
R^2/D10^2 : 0.299074 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 118.61 using 59 PHA bins.
# Reduced chi-squared = 2.0808 for 57 degrees of freedom
# Null hypothesis probability = 3.206471e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.304e-08 2.605e-09
25- 50 1.147e-07 8.550e-09
50-150 3.398e-07 3.300e-08
15-150 4.775e-07 3.530e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-8.19977 -200)
Norm : 25.4872 (-1.42512 1.42512)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 106.80 using 59 PHA bins.
# Reduced chi-squared = 1.8738 for 57 degrees of freedom
# Null hypothesis probability = 7.176371e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.344e-08 3.695e-09
25- 50 1.220e-07 9.350e-09
50-150 2.677e-07 5.040e-08
15-150 4.531e-07 6.015e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.16434 (-1.59031 1.76423)
R1^2/D10^2 : 2.25598 (-0.888475 1.72907)
kT2 [keV] : 42.0884 (-9.10569 19.5746)
R2^2/D10^2 : 2.54968E-02 (-0.0161308 0.02754)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.83 using 59 PHA bins.
# Reduced chi-squared = 0.7423 for 55 degrees of freedom
# Null hypothesis probability = 9.227619e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.284e-08 8.625e-09
25- 50 1.202e-07 2.169e-08
50-150 4.278e-07 1.796e-07
15-150 5.909e-07 1.861e-07
Plot creation:
Mon Feb 1 03:42:14 EST 2016