batgrbproduct Analysis for Trigger=319963
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): Thu Aug 14 05:05:38 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger319963/GCN5_download_cron
======================================================================
Trigger: 00319963 Segment: 000
BAT Trigger Time: 240364160 [s; MET]
Trigger Stop: 240364480 [s; MET]
UTC: 2008-08-13T23:49:16.983280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.825870972831 Dec: -30.3334182928792 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.15
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.15
Flight Position: [ source = BAT ]
RA: 264.825870972831 Dec: -30.3334182928792 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.844218434444 Dec: -30.3031381023224 [deg; J2000]
{ 17h 39m 22.6s , -30d 18' 11.3" }
+/- 2.89468830001297 [arcmin] (estimated 90% radius based on SNR)
+/- 1.28260948341602 [arcmin] (formal 1-sigma fit error)
SNR: 6.66326719819333
Angular difference between Flight and Ground position is 2.050330 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 198.368000000715 +/- 411.01171353988
Measured from: -59.527999997139
to: 138.840000003576 [s; relative to TRIGTIME]
T50: 215.5 +/- 487.873617415579
Measured from: -27.1999999880791
to: 188.300000011921 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -59.8280000090599
to: -58.8280000090599 [s; relative to TRIGTIME]
Total Fluence
Measured from: -61.7520000040531
to: 648.895999997854 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.214242 1.590306 0.197706 0.278548
0.171685 0.151981 0.131603 0.120347 [error]
Peak 0.012488 0.031813 0.007441 0.018951
0.013302 0.011539 0.009912 0.009336 [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 6.62e-07 5.80e-07 3.49e-07 3.16e-07 1.73e-06 1.90e-06 erg/cm2
Error 8.63e-08 7.55e-08 9.47e-08 1.58e-07 2.28e-07 3.11e-07 erg/cm2
Peak flux Power-law 1.88e-01 1.47e-01 7.69e-02 5.83e-02 4.38e-01 4.70e-01 ph/cm2/s
Error 1.54e-01 1.18e-01 7.49e-02 1.13e-01 2.67e-01 2.88e-01 ph/cm2/s
Fluence Cutoff-PL 6.22e-07 6.72e-07 1.75e-07 6.10e-09 1.47e-06 1.47e-06 erg/cm2
Error 9.61e-08 9.96e-08 1.15e-07 3.15e-08 2.04e-07 2.07e-07 erg/cm2
Peak flux Cutoff-PL 1.45e-01 1.91e-01 6.82e-02 3.84e-03 4.08e-01 4.08e-01 ph/cm2/s
Error 1.67e-01 1.23e-01 8.21e-02 9.17e-02 1.91e-01 1.92e-01 ph/cm2/s
Fluence Band 6.22e-07 6.57e-07 1.97e-07 1.63e-08 1.50e-06 1.49e-06 erg/cm2
Error 8.78e-08 6.90e-08 7.56e-08 1.01e-07 2.52e-07 2.61e-07 erg/cm2
Peak flux Band 1.51e-01 1.90e-01 6.98e-02 4.67e-03 4.11e-01 4.06e-01 ph/cm2/s
Error 1.27e-01 1.09e-01 8.14e-02 9.19e-02 2.54e-01 2.39e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.734 0.255 - - 2.26e-04 4.51e-05 65.491 57
CPL 0.349 1.777 21.9 13.6 8.95e-03 1.06e-01 57.858 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.931 1.208 - - 3.02e-03 2.57e-03 51.264 57
CPL -0.497 2.568 41.9 5000.0 7.71e-02 1.07e+00 50.406 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 710.648 -61.752 648.896
T90 198.368 -59.528 138.840
T50 215.500 -27.200 188.300
Peak 1.000 -59.828 -58.828
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.8442 -30.3031 0.0288 11.6 47.4 1.9840 6.7 TRIG_00319963
------------------------------------------
Foreground time interval of the image:
-4.699 338.001 (delta_t = 342.700 [sec])
Background time interval of the image:
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 -61.752 sec. to 648.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.73425 ( -0.244276 0.266376 )
Norm@50keV : 2.255750E-04 ( -4.460425E-05 4.553828E-05) )
------------------------------------------------------------
Chi-Squared = 65.49143 using 59 PHA bins.
Reduced chi-squared = 1.148973 for 57 degrees of freedom
Null hypothesis probability = 0.206
Photon flux (15-150 keV) in 710.6 sec: 5.150724E-02 ( -0.00549346 0.00549347 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72624e-06 ( -2.22972e-07 2.32402e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -61.752 sec. to 648.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.349253 ( -2.00560 1.54757 )
Epeak [keV] : 21.9033 ( -21.8933 5.26150 )
Norm@50keV : 8.945832E-03 ( -8.945832E-03 0.203374 )
------------------------------------------------------------
Chi-Squared = 57.85783 using 59 PHA bins.
Reduced chi-squared = 1.033176 for 56 degrees of freedom
Null hypothesis probability = 0.407
Photon flux (15-150 keV) in 710.6 sec: 4.861664E-02 ( -0.00556604 0.00559631 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47459e-06 ( -1.90149e-07 2.18801e-07 ) ergs/cm2
Band function
Time interval is from -61.752 sec. to 648.896 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28575 ( -1.27196 0.343560 )
beta : -4.99514 ( -4.99165 14.7558 )
Epeak [keV] : 17.2877 ( -6.55511 69.5749 )
Norm@50keV : 1.891846E-03 ( -9.570604E-04 0.239844 )
------------------------------------------------------------
Chi-Squared = 59.23000 using 59 PHA bins.
Reduced chi-squared = 1.076909 for 55 degrees of freedom
Null hypothesis probability = 0.324
Photon flux (15-150 keV) in 710.6 sec: 5.165069E-02 ( -0.00553651 0.00550787 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50178e-06 ( -2.59561e-07 2.43707e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -59.828 sec. to -58.828 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93073 ( -1.04595 1.36953 )
Norm@50keV : 3.017728E-03 ( -3.017728E-03 2.126362E-03) )
------------------------------------------------------------
Chi-Squared = 51.26411 using 59 PHA bins.
Reduced chi-squared = 0.8993703 for 57 degrees of freedom
Null hypothesis probability = 0.689
Photon flux (15-150 keV) in 1.000 sec: 0.438330 ( -0.267034 0.267665 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77055e-08 ( -1.8143e-08 2.05191e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -59.828 sec. to -58.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.496578 ( -2.50342 2.63358 )
Epeak [keV] : 41.8511 ( -41.8411 9958.15 )
Norm@50keV : 7.705123E-02 ( -7.705123E-02 2.06987 )
------------------------------------------------------------
Chi-Squared = 50.40643 using 59 PHA bins.
Reduced chi-squared = 0.9001148 for 56 degrees of freedom
Null hypothesis probability = 0.686
Photon flux (15-150 keV) in 1.000 sec: 0.407910 ( -0.245754 0.136955 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30996e-08 ( -1.4529e-08 2.15544e-08 ) ergs/cm2
Band function
Time interval is from -59.828 sec. to -58.828 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 6.745270E-02 ( -10.0675 4.93255 )
beta : -9.03856 ( -0.961442 19.0385 )
Epeak [keV] : 42.7668 ( -42.6668 9957.23 )
Norm@50keV : 4.334851E-02 ( -45.3408 36.6790 )
------------------------------------------------------------
Chi-Squared = 50.44256 using 59 PHA bins.
Reduced chi-squared = 0.9171374 for 55 degrees of freedom
Null hypothesis probability = 0.649
Photon flux (15-150 keV) in 1.000 sec: 0.411271 ( -0.238009 0.2691 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35603e-08 ( -1.41998e-08 2.19284e-08 ) ergs/cm2
Plot creation:
Thu Aug 14 05:39:35 EDT 2008