batgrbproduct Analysis for Trigger=130679
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Sun Jan 6 18:03:45 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger130679/SDC
======================================================================
Trigger: 00130679 Segment: 000
BAT Trigger Time: 138946004.672 [s; MET]
Trigger Stop: 138946008.768 [s; MET]
UTC: 2005-05-28T04:06:45.128040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 353.529041992498 Dec: 45.9437076292292 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: NO
Rate S/N Ratio: 13.3041346956501 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 353.529041992498 Dec: 45.9437076292292 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 353.524797276688 Dec: 45.9572060880563 [deg; J2000]
{ 23h 34m 06.0s , +45d 57' 25.9" }
+/- 2.21564829327607 [arcmin] (estimated 90% radius based on SNR)
+/- 0.804924867020314 [arcmin] (formal 1-sigma fit error)
SNR: 9.76215673627813
RA = 23h 34m 6.0s (353.524797 deg.)
Dec = 45d 57' 26" (45.957206 deg.)
Angular difference between Flight and Ground position is 0.829039 arcmin
Partial Coding Fraction: 0.2734375 [ including projection effects ]
Duration
T90: 9.46400001645088 +/- 1.60335895823716
Measured from: -5.4839999973774
to: 3.98000001907349 [s; relative to TRIGTIME]
T50: 6.87600001692772 +/- 2.71141660662192
Measured from: -3.55599999427795
to: 3.32000002264977 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.4200000166893
to: 4.4200000166893 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.19599997997284
to: 4.9839999973774 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.279217 0.336348 0.102724 0.002778
0.036266 0.037456 0.031801 0.028738 [error]
Peak 0.033849 0.054527 0.036581 0.001485
0.010288 0.011266 0.009532 0.008336 [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 1.23e-07 1.44e-07 1.20e-07 1.67e-07 4.47e-07 5.52e-07 erg/cm2
Error 2.27e-08 2.01e-08 2.94e-08 7.87e-08 7.03e-08 1.17e-07 erg/cm2
Peak flux Power-law 4.11e-01 3.95e-01 2.65e-01 2.77e-01 1.18e+00 1.35e+00 ph/cm2/s
Error 1.68e-01 1.05e-01 7.48e-02 1.53e-01 3.02e-01 3.25e-01 ph/cm2/s
Fluence Cutoff-PL 1.10e-07 1.74e-07 1.02e-07 1.59e-08 3.99e-07 4.01e-07 erg/cm2
Error 2.69e-08 3.07e-08 2.97e-08 4.42e-08 7.08e-08 8.24e-08 erg/cm2
Peak flux Cutoff-PL 3.00e-01 4.59e-01 3.07e-01 7.61e-02 1.13e+00 1.14e+00 ph/cm2/s
Error 1.95e-01 1.45e-01 9.96e-02 1.70e-01 2.34e-01 3.41e-01 ph/cm2/s
Fluence Band 1.11e-07 1.70e-07 1.05e-07 4.66e-08 4.13e-07 4.37e-07 erg/cm2
Error 2.70e-08 2.53e-08 3.03e-08 6.24e-08 6.24e-08 1.10e-07 erg/cm2
Peak flux Band 3.02e-01 4.59e-01 3.07e-01 7.67e-02 1.13e+00 1.15e+00 ph/cm2/s
Error 1.09e-01 1.24e-01 8.53e-02 1.80e-01 2.35e-01 2.31e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.265 0.256 - - 3.58e-03 6.52e-04 63.209 57
CPL 0.482 1.586 33.2 15.2 4.17e-02 2.38e-01 58.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.578 0.384 - - 9.27e-03 2.25e-03 68.646 57
CPL -0.115 1.975 63.2 4977.4 6.51e-02 6.73e-01 66.354 0
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 13.180 -8.196 4.984
T90 9.464 -5.484 3.980
T50 6.876 -3.556 3.320
Peak 1.000 3.420 4.420
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
353.5248 +45.9572 0.0196 50.3 -173.8 0.7276 9.8 TRIG_00130679
------------------------------------------
Foreground time interval of the image:
-8.196 4.984 (delta_t = 13.180 [sec])
Background time interval of the image:
-299.672 -8.196 (delta_t = 291.476 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 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) 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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -8.196 sec. to 4.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26474 ( -0.245166 0.266784 )
Norm@50keV : 3.575545E-03 ( -6.599012E-04 6.435583E-04) )
------------------------------------------------------------
Chi-Squared = 63.20923 using 59 PHA bins.
Reduced chi-squared = 1.108934 for 57 degrees of freedom
Null hypothesis probability = 0.266
Photon flux (15-150 keV) in 13.18 sec: 0.612836 ( -0.084687 0.084758 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47216e-07 ( -6.93334e-08 7.13539e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.196 sec. to 4.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.482453 ( -1.77818 1.39431 )
Epeak [keV] : 33.2313 ( -22.3303 8.05759 )
Norm@50keV : 4.172223E-02 ( -3.546117E-02 0.440740 )
------------------------------------------------------------
Chi-Squared = 58.20015 using 59 PHA bins.
Reduced chi-squared = 1.039288 for 56 degrees of freedom
Null hypothesis probability = 0.394
Photon flux (15-150 keV) in 13.18 sec: 0.585263 ( -0.087088 0.087439 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99216e-07 ( -6.64483e-08 7.51787e-08 ) ergs/cm2
Band function
Time interval is from -8.196 sec. to 4.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.766279 ( -1.08634 2.14127 )
beta : -4.77209 ( -5.22791 14.2999 )
Epeak [keV] : 32.6676 ( -9.63499 8.44080 )
Norm@50keV : 2.784519E-02 ( -2.784519E-02 713.635 )
------------------------------------------------------------
Chi-Squared = 58.25171 using 59 PHA bins.
Reduced chi-squared = 1.059122 for 55 degrees of freedom
Null hypothesis probability = 0.357
Photon flux (15-150 keV) in 13.18 sec: 0.586972 ( -0.083273 0.08083 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.12937e-07 ( -5.62232e-08 6.84899e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.420 sec. to 4.420 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57786 ( -0.382143 0.386775 )
Norm@50keV : 9.270099E-03 ( -2.251031E-03 2.244224E-03) )
------------------------------------------------------------
Chi-Squared = 68.64623 using 59 PHA bins.
Reduced chi-squared = 1.204320 for 57 degrees of freedom
Null hypothesis probability = 0.139
Photon flux (15-150 keV) in 1.000 sec: 1.18327 ( -0.300856 0.30365 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.69567e-08 ( -2.18756e-08 2.19853e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.420 sec. to 4.420 sec.
Parameters : value lower 90% higher 90%
Photon index: -0.114505 ( -2.88550 1.06534 )
Epeak [keV] : 63.2143 ( -17.9772 9936.79 )
Norm@50keV : 6.507374E-02 ( -6.507374E-02 1.28100 )
------------------------------------------------------------
Chi-Squared = 66.35446 using 59 PHA bins.
but latest trial 1.93299 gives Chi-Squared = 4.59827
but latest trial 1.34698 gives Chi-Squared = 2.74268
Reduced chi-squared = 1.184901 for 56 degrees of freedom
Null hypothesis probability = 0.162
Photon flux (15-150 keV) in 1.000 sec: 1.12762 ( -0.156119 0.31143 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.14438e-08 ( -2.47281e-08 2.37142e-08 ) ergs/cm2
Band function
Time interval is from 3.420 sec. to 4.420 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.105583 ( -3.88821 2.55504 )
beta : -9.16964 ( -7.36171 12.6382 )
Epeak [keV] : 63.4675 ( -17.4234 144.683 )
Norm@50keV : 6.409468E-02 ( -0.837772 18.8265 )
------------------------------------------------------------
Chi-Squared = 66.35463 using 59 PHA bins.
Reduced chi-squared = 1.206448 for 55 degrees of freedom
Null hypothesis probability = 0.140
Photon flux (15-150 keV) in 1.000 sec: 1.12821 ( -0.158133 0.3109 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.11041e-08 ( -2.25953e-08 2.04169e-08 ) ergs/cm2
Plot creation:
Sun Jan 6 18:17:20 EST 2008