batgrbproduct Analysis for Trigger=531003
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): Wed Aug 15 18:53:37 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger531003/GCN5_download_cron
======================================================================
Trigger: 00531003 Segment: 000
BAT Trigger Time: 366689648.32 [s; MET]
Trigger Stop: 366689649.344 [s; MET]
UTC: 2012-08-15T02:13:58.781640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 273.955183891862 Dec: -52.1341064210625 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.23
Image Trigger?: NO
Rate S/N Ratio: 16.0312195418814 [ if not an image trigger ]
Image S/N Ratio: 9.23
Flight Position: [ source = BAT ]
RA: 273.955183891862 Dec: -52.1341064210625 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 273.976500005112 Dec: -52.1247117408774 [deg; J2000]
{ 18h 15m 54.4s , -52d 07' 29.0" }
+/- 1.78575405939845 [arcmin] (estimated 90% radius based on SNR)
+/- 0.713247011545927 [arcmin] (formal 1-sigma fit error)
SNR: 13.2853552326614
Angular difference between Flight and Ground position is 0.966524 arcmin
Partial Coding Fraction: 0.2851562 [ including projection effects ]
Duration
T90: 9.70799994468689 +/- 2.51212497252856
Measured from: -0.00399988889694214
to: 9.70400005578995 [s; relative to TRIGTIME]
T50: 4.28799992799759 +/- 1.60667608925218
Measured from: 0.80400013923645
to: 5.09200006723404 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.171999990940094
to: 1.17199999094009 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.244000017642975
to: 11.9679999947548 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.364487 0.376613 0.130256 0.037202
0.036728 0.037697 0.031749 0.026978 [error]
Peak 0.088065 0.085882 0.053559 0.013334
0.011788 0.012015 0.009946 0.008621 [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 1.40e-07 1.59e-07 1.30e-07 1.78e-07 4.94e-07 6.08e-07 erg/cm2
Error 2.12e-08 1.95e-08 2.91e-08 7.53e-08 6.90e-08 1.14e-07 erg/cm2
Peak flux Power-law 9.57e-01 7.44e-01 3.88e-01 2.92e-01 2.22e+00 2.38e+00 ph/cm2/s
Error 2.01e-01 1.07e-01 8.26e-02 1.18e-01 3.23e-01 3.42e-01 ph/cm2/s
Fluence Cutoff-PL 1.31e-07 1.83e-07 1.10e-07 2.44e-08 4.49e-07 0.00e+00 erg/cm2
Error 2.32e-08 2.82e-08 4.09e-08 9.71e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 8.98e-01 8.13e-01 3.87e-01 1.17e-01 2.18e+00 2.22e+00 ph/cm2/s
Error 2.21e-01 1.48e-01 9.75e-02 1.88e-01 3.28e-01 2.74e-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 2.291 0.225 - - 4.24e-03 7.01e-04 49.030 57
CPL 1.033 1.259 28.6 0.0 2.55e-02 0.00e+00 44.770 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.940 0.247 - - 1.52e-02 2.52e-03 62.280 57
CPL 1.222 1.091 45.7 0.0 3.96e-02 0.00e+00 60.840 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 12.212 -0.244 11.968
T90 9.708 -0.004 9.704
T50 4.288 0.804 5.092
Peak 1.000 0.172 1.172
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
273.9765 -52.1247 0.0145 43.8 19.7 0.9571 13.3 TRIG_00531003
------------------------------------------
Foreground time interval of the image:
-0.244 11.968 (delta_t = 12.212 [sec])
Background time interval of the image:
-239.320 -0.244 (delta_t = 239.076 [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 -0.244 sec. to 11.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.29054 ( -0.216266 0.233794 )
Norm@50keV : 4.24395E-03 ( -0.000707322 0.000693694 )
------------------------------------------------------------
# Chi-Squared = 49.03 using 59 PHA bins.
# Reduced chi-squared = 0.8602 for 57 degrees of freedom
# Null hypothesis probability = 7.645813e-01
Photon flux (15-150 keV) in 12.21 sec: 0.737785 ( -0.0863676 0.0863849 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.94332e-07 ( -6.81579e-08 6.97789e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.244 sec. to 11.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03294 ( -1.44715 1.06989 )
Epeak [keV] : 28.6308 ( )
Norm@50keV : 2.54808E-02 ( )
------------------------------------------------------------
# Chi-Squared = 44.77 using 59 PHA bins.
# Reduced chi-squared = 0.7994 for 56 degrees of freedom
# Null hypothesis probability = 8.594906e-01
Photon flux (15-150 keV) in 12.21 sec: 0.714853 ( -0.087811 0.088199 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.48929e-07 ( -7.42209e-08 1.19918e-07 ) ergs/cm2
Band function
Time interval is from -0.244 sec. to 11.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.82646 ( -14.5474 -4.65396 )
beta : -2.68950 ( -0.731755 0.381895 )
Epeak [keV] : 24.9978 ( -5.04924 10.6099 )
Norm@50keV : 22.4356 ( -21.8138 436.949 )
------------------------------------------------------------
# Chi-Squared = 43.23 using 59 PHA bins.
# Reduced chi-squared = 0.7861 for 55 degrees of freedom
# Null hypothesis probability = 8.746659e-01
Photon flux (15-150 keV) in 12.21 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] : 8.11555 (-1.0311 1.16554)
R^2/D10^2 : 0.775706 (-0.324493 0.570203)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.26 using 59 PHA bins.
# Reduced chi-squared = 0.9168 for 57 degrees of freedom
# Null hypothesis probability = 6.532480e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.140e-07 2.187e-08
25- 50 2.045e-07 3.523e-08
50-150 5.628e-08 2.050e-08
15-150 3.748e-07 5.733e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.0498 (-10.2538 15.4547)
Norm : 4.74085 (-0.960115 1.25468)
------------------------------------------------------------
# Chi-Squared = 44.90 using 59 PHA bins.
# Reduced chi-squared = 0.7877 for 57 degrees of freedom
# Null hypothesis probability = 8.772545e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.341e-07 1.886e-08
25- 50 1.783e-07 2.650e-08
50-150 1.419e-07 5.161e-08
15-150 4.543e-07 7.595e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.72842 (-1.92367 1.86875)
R1^2/D10^2 : 2.31616 (-1.38834 4.74998)
kT2 [keV] : 15.7971 (-5.9351 26.2034)
R2^2/D10^2 : 2.79795E-02 (-0.0260546 0.220509)
------------------------------------------------------------
# Chi-Squared = 43.56 using 59 PHA bins.
# Reduced chi-squared = 0.7921 for 55 degrees of freedom
# Null hypothesis probability = 8.669037e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.327e-07 7.216e-08
25- 50 1.771e-07 9.304e-08
50-150 1.355e-07 8.333e-08
15-150 4.453e-07 2.346e-07
Peak spectrum fit
Power-law model
Time interval is from 0.172 sec. to 1.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94024 ( -0.2408 0.253576 )
Norm@50keV : 1.52180E-02 ( -0.00255319 0.00249511 )
------------------------------------------------------------
# Chi-Squared = 62.28 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.938235e-01
Photon flux (15-150 keV) in 1 sec: 2.22220 ( -0.32305 0.323397 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40008e-07 ( -2.25599e-08 2.29024e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.172 sec. to 1.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22174 ( -1.2986 0.884337 )
Epeak [keV] : 45.6872 ( )
Norm@50keV : 3.96269E-02 ( )
------------------------------------------------------------
# Chi-Squared = 60.84 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 56 degrees of freedom
# Null hypothesis probability = 3.059883e-01
Photon flux (15-150 keV) in 1 sec: 2.18192 ( -0.3284 0.32849 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31664e-07 ( -2.4315e-08 2.4405e-08 ) ergs/cm2
Band function
Time interval is from 0.172 sec. to 1.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99828 ( -1122.61 -1107.63 )
beta : -2.25004 ( -0.438989 0.344098 )
Epeak [keV] : 25.1647 ( -4.46788 4.08046 )
Norm@50keV : 2435.82 ( -1577.74 6361.13 )
------------------------------------------------------------
# Chi-Squared = 55.95 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Null hypothesis probability = 4.390836e-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] : 10.2025 (-1.74539 2.04419)
R^2/D10^2 : 0.979886 (-0.495044 1.03926)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 70.35 using 59 PHA bins.
# Reduced chi-squared = 1.234 for 57 degrees of freedom
# Null hypothesis probability = 1.101355e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.091e-08 5.380e-09
25- 50 5.347e-08 1.140e-08
50-150 2.956e-08 1.073e-08
15-150 1.039e-07 2.194e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 72.4706 (-25.0208 50.2015)
Norm : 10.9101 (-2.26378 2.84972)
------------------------------------------------------------
# Chi-Squared = 60.80 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 57 degrees of freedom
# Null hypothesis probability = 3.408688e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.809e-08 5.610e-09
25- 50 4.510e-08 8.050e-09
50-150 5.942e-08 2.705e-08
15-150 1.326e-07 2.828e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.13843 (-1.74463 2.48899)
R1^2/D10^2 : 5.00684 (-3.4122 11.5698)
kT2 [keV] : 20.7207 (-7.16984 41.7973)
R2^2/D10^2 : 4.26894E-02 (-0.0414624 0.0862213)
------------------------------------------------------------
# Chi-Squared = 58.66 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 55 degrees of freedom
# Null hypothesis probability = 3.426636e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.937e-08 1.665e-08
25- 50 4.487e-08 2.323e-08
50-150 5.946e-08 3.601e-08
15-150 1.337e-07 6.698e-08
Plot creation:
Wed Aug 15 19:09:19 EDT 2012