batgrbproduct Analysis for Trigger=679432
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Thu Mar 17 14:02:59 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger679432
======================================================================
Trigger: 00679432 Segment: 000
BAT Trigger Time: 479860900.372 [s; MET]
Trigger Stop: 479860900.404 [s; MET]
UTC: 2016-03-16T22:41:24.382800 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 118.883924452106 Dec: -29.5525898969174 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.69
Image Trigger?: NO
Rate S/N Ratio: 11.9582607431014 [ if not an image trigger ]
Image S/N Ratio: 6.69
Flight Position: [ source = BAT ]
RA: 118.883924452106 Dec: -29.5525898969174 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 118.86256881071 Dec: -29.5723078623697 [deg; J2000]
{ 07h 55m 27.0s , -29d 34' 20.3" }
+/- 3.3631082035154 [arcmin] (estimated 90% radius based on SNR)
+/- 1.95130557049968 [arcmin] (formal 1-sigma fit error)
SNR: 5.37813209758664
Angular difference between Flight and Ground position is 1.625378 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 0.0239999890327454 +/- 0.00894429003608426
Measured from: 0
to: 0.024 [s; relative to TRIGTIME]
T50: 0.0119999647140503 +/- 0.0113137314268704
Measured from: 0.00800002
to: 0.02 [s; relative to TRIGTIME]
Special note: battblocks using the 15-350 keV light curve failed,
thus burst durations are estimated by battblocks
using 15-25 keV light curves (with 4-ms binning).
Fluence
Peak Flux
Measured from: -0.488
to: 0.512 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.004
to: 0.024 [s; relative to TRIGTIME]
======================================================================
=== 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 3.64e-09 1.71e-09 4.90e-10 1.77e-10 5.94e-09 6.02e-09 erg/cm2
Error 9.22e-10 7.56e-10 4.42e-10 3.00e-10 1.83e-09 1.92e-09 erg/cm2
Peak flux Power-law 2.30e-01 5.63e-02 7.61e-03 1.25e-03 3.04e-01 2.88e-01 ph/cm2/s
Error 1.07e-01 5.65e-02 1.46e-02 5.11e-03 1.50e-01 1.52e-01 ph/cm2/s
Fluence Cutoff-PL -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Cutoff-PL 2.36e-01 5.81e-02 8.58e-03 1.37e-03 2.92e-01 2.84e-01 ph/cm2/s
Error 1.08e-01 5.68e-02 -------- -------- 1.49e-01 1.53e-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 3.809 0.742 - - 1.10e-02 7.71e-03 45.610 57
CPL 1.000 0.000 80.0 0.0 3.81e-02 0.00e+00 79.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.889 1.586 - - 5.32e-04 7.54e-04 48.680 57
CPL 1.000 0.000 80.0 0.0 1.70e-03 0.00e+00 59.890 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 0.028 -0.004 0.024
T90 0.024 0.000 0.024
T50 0.012 0.008 0.020
Peak 1.000 -0.488 0.512
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
118.8626 -29.5723 0.0356 29.3866 154.7781 0.0161066 5.378 TRIG_00679432
Foreground time interval of the image:
0.000 0.032 (delta_t = 0.032 [sec])
Background time interval of the image:
-60.372 -4.372 (delta_t = 56.000 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -0.004 sec. to 0.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.80851 ( -0.629947 0.854187 )
Norm@50keV : 1.10028E-02 ( -0.00658728 0.00883714 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.61 using 59 PHA bins.
# Reduced chi-squared = 0.8001 for 57 degrees of freedom
# Null hypothesis probability = 8.608989e-01
Photon flux (15-150 keV) in 0.028 sec: 5.75687 ( -1.48164 1.4934 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.93496e-09 ( -1.75293e-09 1.89731e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 80.0000 ( )
Norm@50keV : 3.81232E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.16 using 59 PHA bins.
# Reduced chi-squared = 1.414 for 56 degrees of freedom
# Null hypothesis probability = 2.249171e-02
Photon flux (15-150 keV) in 0.028 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.024 sec.
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.32985 (-0.735619 0.841363)
R^2/D10^2 : 112.491 (-67.3619 179.885)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.87 using 59 PHA bins.
# Reduced chi-squared = 0.6819 for 57 degrees of freedom
# Null hypothesis probability = 9.683516e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.152e-09 2.440e-09
25- 50 1.868e-09 1.139e-09
50-150 3.597e-11 3.541e-11
15-150 6.056e-09 3.541e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.5883 (-3.21484 4.78522)
Norm : 189.496 (-89.7363 209.037)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.73 using 59 PHA bins.
# Reduced chi-squared = 0.7320 for 57 degrees of freedom
# Null hypothesis probability = 9.356105e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.934e-09 1.935e-09
25- 50 1.826e-09 1.116e-09
50-150 1.458e-10 1.488e-10
15-150 5.905e-09 2.952e-09
Double BB
# Reduced chi-squared = 0.7063 for 55 degrees of freedom
# Reduced chi-squared = 0.7018 for 55 degrees of freedom
# Reduced chi-squared = 0.6991 for 55 degrees of freedom
# Reduced chi-squared = 0.6975 for 55 degrees of freedom
# Reduced chi-squared = 0.6966 for 55 degrees of freedom
# Reduced chi-squared = 0.6962 for 55 degrees of freedom
# Null hypothesis probability = 9.511008e-01
# Null hypothesis probability = 9.513596e-01
# Null hypothesis probability = 9.543367e-01
# Null hypothesis probability = 9.560146e-01
# Null hypothesis probability = 9.570106e-01
# Null hypothesis probability = 9.575365e-01
# Null hypothesis probability = 9.577880e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.488 sec. to 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.88926 ( -1.10543 2.06588 )
Norm@50keV : 5.32069E-04 ( -0.00053392 0.000974459 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.68 using 59 PHA bins.
# Reduced chi-squared = 0.8541 for 57 degrees of freedom
# Null hypothesis probability = 7.754955e-01
Photon flux (15-150 keV) in 1 sec: 0.303907 ( -0.151634 0.148247 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08355e-08 ( -5.95291e-09 7.39674e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.488 sec. to 0.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 80.0000 ( )
Norm@50keV : 1.69604E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.89 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 56 degrees of freedom
# Null hypothesis probability = 3.364581e-01
Photon flux (15-150 keV) in 1 sec: 0.292168 ( -0.138794 0.158542 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.488 sec. to 0.512 sec.
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.43646 (-1.48869 1.74781)
R^2/D10^2 : 5.42216 (-5.37762 37.5387)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.17 using 59 PHA bins.
# Reduced chi-squared = 0.8101 for 57 degrees of freedom
# Null hypothesis probability = 8.467918e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.969e-09 5.145e-09
25- 50 3.829e-09 2.760e-09
50-150 8.427e-11 9.485e-11
15-150 1.188e-08 7.375e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.4948 (-5.44212 10.9009)
Norm : 10.2995 (-10.2957 40.5932)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.16 using 59 PHA bins.
# Reduced chi-squared = 0.8274 for 57 degrees of freedom
# Null hypothesis probability = 8.204031e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.524e-09 4.709e-09
25- 50 3.452e-09 2.600e-09
50-150 2.693e-10 3.514e-10
15-150 1.125e-08 7.525e-09
Double BB
#Fit statistic : Chi-Squared = 46.04 using 59 PHA bins.
# Reduced chi-squared = 0.8395 for 55 degrees of freedom
# Reduced chi-squared = 0.8393 for 55 degrees of freedom
# Reduced chi-squared = 0.8384 for 55 degrees of freedom
# Reduced chi-squared = 0.8377 for 55 degrees of freedom
# Reduced chi-squared = 0.8374 for 55 degrees of freedom
# Reduced chi-squared = 0.8372 for 55 degrees of freedom
# Null hypothesis probability = 7.958002e-01
# Null hypothesis probability = 7.961757e-01
# Null hypothesis probability = 7.976727e-01
# Null hypothesis probability = 7.987779e-01
# Null hypothesis probability = 7.993949e-01
# Null hypothesis probability = 7.997266e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.975e-09 2.041e-01
25- 50 3.845e-09 1.705e+00
50-150 8.531e-11 4.056e+01
15-150 1.190e-08 4.667e+01
Plot creation:
Thu Mar 17 14:46:53 EDT 2016