batgrbproduct Analysis for Trigger=586482
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): Thu Feb 13 09:24:41 EST 2014
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger586482/GCN5_download_cron
======================================================================
Trigger: 00586482 Segment: 000
BAT Trigger Time: 413919379.712 [s; MET]
Trigger Stop: 413919380.224 [s; MET]
UTC: 2014-02-12T17:36:08.075260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.107055183349 Dec: -28.7428126993116 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.97
Image Trigger?: NO
Rate S/N Ratio: 13 [ if not an image trigger ]
Image S/N Ratio: 7.97
Flight Position: [ source = BAT ]
RA: 266.107055183349 Dec: -28.7428126993116 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.137541562321 Dec: -28.7486993696322 [deg; J2000]
{ 17h 44m 33.0s , -28d 44' 55.3" }
+/- 1.15690621653633 [arcmin] (estimated 90% radius based on SNR)
+/- 0.439628139499292 [arcmin] (formal 1-sigma fit error)
SNR: 24.6997435802852
Angular difference between Flight and Ground position is 1.642191 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 8.73199999332428 +/- 1.33767710680543
Measured from: -0.135999917984009
to: 8.59600007534027 [s; relative to TRIGTIME]
T50: 4.19599992036819 +/- 0.720902245151053
Measured from: 1.3600001335144
to: 5.5560000538826 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.17199999094009
to: 2.17199999094009 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.467999994754791
to: 10.6599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.837853 0.346648 0.050779 0.013662
0.028512 0.023983 0.018682 0.016355 [error]
Peak 0.150238 0.063912 0.008802 0.002130
0.009541 0.007861 0.005646 0.004885 [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 2.61e-07 1.35e-07 4.30e-08 1.76e-08 4.48e-07 4.56e-07 erg/cm2
Error 2.26e-08 1.33e-08 9.68e-09 7.05e-09 3.27e-08 3.44e-08 erg/cm2
Peak flux Power-law 1.51e+00 4.70e-01 8.06e-02 1.60e-02 2.07e+00 2.08e+00 ph/cm2/s
Error 1.91e-01 7.45e-02 2.86e-02 9.87e-03 2.26e-01 2.26e-01 ph/cm2/s
Fluence Cutoff-PL 2.51e-07 1.36e-07 1.05e-08 4.48e-11 3.98e-07 3.98e-07 erg/cm2
Error 2.47e-08 1.64e-08 1.09e-08 6.19e-10 3.53e-08 3.53e-08 erg/cm2
Peak flux Cutoff-PL 1.49e+00 4.92e-01 3.71e-02 4.77e-04 2.02e+00 2.02e+00 ph/cm2/s
Error 2.01e-01 8.77e-02 4.59e-02 5.23e-03 2.30e-01 2.30e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.646 0.209 - - 2.33e-03 3.96e-04 79.170 57
CPL 1.000 0.000 50.0 0.0 1.24e-02 0.00e+00 320.590 56
The chi2 of BB fit is 71.44 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.543 0.325 - - 4.95e-03 1.38e-03 49.240 57
CPL 1.000 0.000 50.0 0.0 2.71e-02 0.00e+00 151.240 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 11.128 -0.468 10.660
T90 8.732 -0.136 8.596
T50 4.196 1.360 5.556
Peak 1.000 1.172 2.172
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.1375 -28.7487 0.0078 0.0 26.7 1.1090 24.7 TRIG_00586482
------------------------------------------
Foreground time interval of the image:
-0.468 10.660 (delta_t = 11.128 [sec])
Background time interval of the image:
-239.712 -76.692 (delta_t = 163.020 [sec])
-75.712 -0.468 (delta_t = 75.244 [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 -0.468 sec. to 10.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.64607 ( -0.203755 0.214261 )
Norm@50keV : 2.33488E-03 ( -0.00038421 0.000407935 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.17 using 59 PHA bins.
# Reduced chi-squared = 1.389 for 57 degrees of freedom
# Null hypothesis probability = 2.769470e-02
Photon flux (15-150 keV) in 11.13 sec: 1.06469 ( -0.0774849 0.0777167 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.48418e-07 ( -3.26346e-08 3.28267e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.468 sec. to 10.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.23558E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 320.59 using 59 PHA bins.
# Reduced chi-squared = 5.7248 for 56 degrees of freedom
# Null hypothesis probability = 9.120586e-39
Photon flux (15-150 keV) in 11.13 sec: 0.999415 ( -0.085967 0.085265 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.98295e-07 ( -3.43105e-08 3.61936e-08 ) ergs/cm2
Band function
Time interval is from -0.468 sec. to 10.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.58531 ( )
beta : -8.92351 ( )
Epeak [keV] : 12.0971 ( )
Norm@50keV : 2.06065E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 136.65 using 59 PHA bins.
# Reduced chi-squared = 2.4845 for 55 degrees of freedom
# Null hypothesis probability = 6.778327e-09
Photon flux (15-150 keV) in 11.13 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] : 4.63609 (-0.303509 0.326897)
R^2/D10^2 : 12.1874 (-3.72266 5.45179)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.44 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 57 degrees of freedom
# Null hypothesis probability = 9.438525e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.414e-07 2.582e-08
25- 50 1.302e-07 1.750e-08
50-150 3.623e-09 1.391e-09
15-150 3.753e-07 3.411e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9792 (-1.39873 1.73357)
Norm : 25.4380 (-5.57163 7.4331)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.92 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 57 degrees of freedom
# Null hypothesis probability = 1.337720e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.543e-07 2.771e-08
25- 50 1.372e-07 1.664e-08
50-150 1.490e-08 5.324e-09
15-150 4.065e-07 3.634e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.30387 (-0.573469 0.412814)
R1^2/D10^2 : 16.9710 (-6.25465 13.6173)
kT2 [keV] : 14.4980 (-11.2584 22.4191)
R2^2/D10^2 : 1.27760E-02 (-0.0123385 0.0900596)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.65 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 55 degrees of freedom
# Null hypothesis probability = 1.540370e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.485e-07 4.268e-08
25- 50 1.315e-07 3.086e-08
50-150 3.608e-08 2.518e-08
15-150 4.161e-07 8.470e-08
Peak spectrum fit
Power-law model
Time interval is from 1.172 sec. to 2.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.54284 ( -0.30766 0.341889 )
Norm@50keV : 4.94666E-03 ( -0.0013192 0.00144361 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.24 using 59 PHA bins.
# Reduced chi-squared = 0.8639 for 57 degrees of freedom
# Null hypothesis probability = 7.578734e-01
Photon flux (15-150 keV) in 1 sec: 2.07164 ( -0.22582 0.225847 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.99247e-08 ( -9.71693e-09 9.96388e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.172 sec. to 2.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.70767E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 151.24 using 59 PHA bins.
# Reduced chi-squared = 2.7007 for 56 degrees of freedom
# Null hypothesis probability = 1.077282e-10
Photon flux (15-150 keV) in 1 sec: 2.01920 ( -0.22942 0.23007 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.37179e-08 ( -9.2612e-09 1.09022e-08 ) ergs/cm2
Band function
Time interval is from 1.172 sec. to 2.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73427 ( 1.43471 1.43471 )
beta : -4.79262 ( 4.88831 1.47465 )
Epeak [keV] : 3.92551 ( -3.95944 6.46287 )
Norm@50keV : 0.104575 ( -0.0428095 20216.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.71 using 59 PHA bins.
# Reduced chi-squared = 0.8492 for 55 degrees of freedom
# Null hypothesis probability = 7.793151e-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] : 4.62830 (-0.515317 0.571625)
R^2/D10^2 : 24.6072 (-10.9776 21.0228)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.72 using 59 PHA bins.
# Reduced chi-squared = 0.9074 for 57 degrees of freedom
# Null hypothesis probability = 6.726596e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.348e-08 9.285e-09
25- 50 2.335e-08 5.435e-09
50-150 6.440e-10 3.744e-10
15-150 6.748e-08 1.117e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.5086 (-2.31842 3.04865)
Norm : 46.6855 (-13.3925 22.3915)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.97 using 59 PHA bins.
# Reduced chi-squared = 0.8240 for 57 degrees of freedom
# Null hypothesis probability = 8.257328e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.461e-08 6.850e-09
25- 50 2.529e-08 4.935e-09
50-150 3.037e-09 1.585e-09
15-150 7.293e-08 1.186e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.83719 (-2.05727 28.7057)
R1^2/D10^2 : 186.821 (-160.115 0)
kT2 [keV] : 6.31456 (-1.633 49.7289)
R2^2/D10^2 : 3.59089 (-3.5907 18.1537)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.84 using 59 PHA bins.
# Reduced chi-squared = 0.8516 for 55 degrees of freedom
# Null hypothesis probability = 7.751730e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.489e-08 2.175e-08
25- 50 2.562e-08 1.417e-08
50-150 2.554e-09 1.701e-09
15-150 7.306e-08 3.452e-08
Plot creation:
Thu Feb 13 09:48:43 EST 2014