batgrbproduct Analysis for Trigger=313299
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): Fri Jun 6 09:52:30 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger313299/SDC
======================================================================
Trigger: 00313299 Segment: 000
BAT Trigger Time: 234402480.704 [s; MET]
Trigger Stop: 234402481.728 [s; MET]
UTC: 2008-06-05T23:47:57.859480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 262.127299384762 Dec: 4.00166807477933 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 25.82
Image Trigger?: NO
Rate S/N Ratio: 120.743529847359 [ if not an image trigger ]
Image S/N Ratio: 25.82
Flight Position: [ source = BAT ]
RA: 262.127299384762 Dec: 4.00166807477933 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 262.129755086617 Dec: 4.00988838608702 [deg; J2000]
{ 17h 28m 31.1s , +04d 00' 35.6" }
+/- 0.560516913179193 [arcmin] (estimated 90% radius based on SNR)
+/- 0.157279524781053 [arcmin] (formal 1-sigma fit error)
SNR: 69.5468315664197
Angular difference between Flight and Ground position is 0.514654 arcmin
Partial Coding Fraction: 0.4140625 [ including projection effects ]
Duration
T90: 19.1399999856949 +/- 0.939105951293475
Measured from: -2.77199998497963
to: 16.3680000007153 [s; relative to TRIGTIME]
T50: 7.108000010252 +/- 0.118928538399279
Measured from: 2.35199999809265
to: 9.46000000834465 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.57199999690056
to: 8.57199999690056 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.53200000524521
to: 29.972000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.625723 7.237420 6.127881 1.608223
0.064999 0.072210 0.070566 0.060553 [error]
Peak 0.429365 0.843128 0.904476 0.319032
0.015827 0.020455 0.021944 0.016579 [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 1.54e-06 3.09e-06 4.83e-06 1.66e-05 1.35e-05 2.53e-05 erg/cm2
Error 6.12e-08 7.02e-08 8.70e-08 7.46e-07 2.23e-07 0.00e+00 erg/cm2
Peak flux Power-law 4.37e+00 5.96e+00 6.00e+00 1.09e+01 1.99e+01 2.73e+01 ph/cm2/s
Error 2.78e-01 2.26e-01 1.80e-01 7.40e-01 5.91e-01 8.34e-01 ph/cm2/s
Fluence Cutoff-PL 1.41e-06 3.10e-06 4.96e-06 1.26e-05 1.33e-05 1.70e-05 erg/cm2
Error 8.86e-08 7.25e-08 1.12e-07 2.40e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.97e+00 6.02e+00 6.25e+00 8.28e+00 1.96e+01 2.45e+01 ph/cm2/s
Error 3.74e-01 2.37e-01 2.45e-01 1.55e+00 6.14e-01 1.69e+00 ph/cm2/s
Fluence Band 1.42e-06 3.09e-06 4.95e-06 1.27e-05 1.33e-05 1.47e-05 erg/cm2
Error 8.68e-08 7.16e-08 1.12e-07 1.91e-06 2.42e-07 0.00e+00 erg/cm2
Peak flux Band 3.97e+00 6.02e+00 6.26e+00 8.28e+00 1.96e+01 2.46e+01 ph/cm2/s
Error 3.74e-01 2.37e-01 2.46e-01 1.56e+00 6.16e-01 1.93e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.357 0.033 - - 3.89e-02 6.66e-04 36.954 57
CPL 1.112 0.144 223.4 133.8 4.89e-02 6.44e-03 28.098 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.991 0.052 - - 1.73e-01 5.01e-03 62.528 57
CPL 0.676 0.219 257.6 226.6 2.34e-01 4.85e-02 56.004 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: 16.448000 sec.
T50 in the 50-300 keV band: 6.656000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 35.504 -5.532 29.972
T90 19.140 -2.772 16.368
T50 7.108 2.352 9.460
Peak 1.000 7.572 8.572
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
262.1298 +4.0099 0.0027 29.6 63.9 18.7870 69.5 TRIG_00313299
------------------------------------------
Foreground time interval of the image:
-5.532 14.901 (delta_t = 20.433 [sec])
Background time interval of the image:
-216.099 -5.532 (delta_t = 210.567 [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 -5.532 sec. to 29.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35722 ( -3.338385E-02 3.330016E-02) )
Norm@50keV : 3.890122E-02 ( -6.668828E-04 6.659366E-04) )
------------------------------------------------------------
Chi-Squared = 36.95428 using 59 PHA bins.
Reduced chi-squared = 0.6483207 for 57 degrees of freedom
Null hypothesis probability = 0.982
Photon flux (15-150 keV) in 35.50 sec: 4.69350 ( -0.09491 0.09535 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34663e-05 ( -2.23295e-07 2.23153e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.532 sec. to 29.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11219 ( -0.146852 0.141183 )
Epeak [keV] : 223.387 ( -60.4470 207.092 )
Norm@50keV : 4.886936E-02 ( -5.897988E-03 6.981723E-03) )
------------------------------------------------------------
Chi-Squared = 28.09830 using 59 PHA bins.
Reduced chi-squared = 0.5017554 for 56 degrees of freedom
Null hypothesis probability = 0.999
Photon flux (15-150 keV) in 35.50 sec: 4.58877 ( -0.10943 0.11032 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33139e-05 ( -2.39021e-07 2.41365e-07 ) ergs/cm2
Band function
Time interval is from -5.532 sec. to 29.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.912717 ( -0.459034 0.940591 )
beta : -1.43590 ( -7.46364 1.13145 )
Epeak [keV] : 118.293 ( -145.563 206.864 )
Norm@50keV : 6.378316E-02 ( -5.928241E-03 6.953452E-03) )
------------------------------------------------------------
Chi-Squared = 30.28362 using 59 PHA bins.
Reduced chi-squared = 0.5506113 for 55 degrees of freedom
Null hypothesis probability = 0.997
Photon flux (15-150 keV) in 35.50 sec: 4.58891 ( -0.10965 0.11059 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33035e-05 ( -2.4243e-07 2.41258e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 7.572 sec. to 8.572 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.991416 ( -5.254853E-02 5.224532E-02) )
Norm@50keV : 0.172668 ( -5.016461E-03 5.006269E-03) )
------------------------------------------------------------
Chi-Squared = 62.52763 using 59 PHA bins.
Reduced chi-squared = 1.096976 for 57 degrees of freedom
Null hypothesis probability = 0.286
Photon flux (15-150 keV) in 1.000 sec: 19.8696 ( -0.5898 0.5919 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87293e-06 ( -5.6517e-08 5.6476e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.572 sec. to 8.572 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.675874 ( -0.226633 0.212323 )
Epeak [keV] : 257.632 ( -81.9171 371.182 )
Norm@50keV : 0.233675 ( -4.216893E-02 5.490766E-02) )
------------------------------------------------------------
Chi-Squared = 56.00361 using 59 PHA bins.
Reduced chi-squared = 1.000064 for 56 degrees of freedom
Null hypothesis probability = 0.475
Photon flux (15-150 keV) in 1.000 sec: 19.6011 ( -0.6146 0.6133 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85847e-06 ( -5.865e-08 5.7807e-08 ) ergs/cm2
Band function
Time interval is from 7.572 sec. to 8.572 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.883641 ( -14.9986 1.372814E-03) )
beta : -0.991421 ( -5.987394E-02 4.747719E-02) )
Epeak [keV] : 22.1112 ( -22.0112 9977.88 )
Norm@50keV : 0.270172 ( -11597.9 2.525002E+07) )
------------------------------------------------------------
Chi-Squared = 62.52765 using 59 PHA bins.
Reduced chi-squared = 1.136866 for 55 degrees of freedom
Null hypothesis probability = 0.227
Photon flux (15-150 keV) in 1.000 sec: 19.6009 ( -0.6146 0.6165 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85734e-06 ( -5.8626e-08 5.8338e-08 ) ergs/cm2
Plot creation:
Sat Jun 7 09:21:25 EDT 2008