batgrbproduct Analysis for Trigger=316204
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): Mon Jul 7 20:34:06 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger316204/GCN5_download_cron
======================================================================
Trigger: 00316204 Segment: 000
BAT Trigger Time: 237112076.608 [s; MET]
Trigger Stop: 237112077.632 [s; MET]
UTC: 2008-07-07T08:27:53.685800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 32.6317294574555 Dec: 33.1030732163443 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.84
Image Trigger?: NO
Rate S/N Ratio: 20.3715487874634 [ if not an image trigger ]
Image S/N Ratio: 9.84
Flight Position: [ source = BAT ]
RA: 32.6317294574555 Dec: 33.1030732163443 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 32.6273491063703 Dec: 33.1002395131566 [deg; J2000]
{ 02h 10m 30.6s , +33d 06' 00.9" }
+/- 1.80844860201312 [arcmin] (estimated 90% radius based on SNR)
+/- 0.809481408866625 [arcmin] (formal 1-sigma fit error)
SNR: 13.0478254102267
Angular difference between Flight and Ground position is 0.278174 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 31.7080000042915 +/- 6.13460347783576
Measured from: -1.216000020504
to: 30.4919999837875 [s; relative to TRIGTIME]
T50: 23.4480000138283 +/- 1.31271476447358
Measured from: 1.41599997878075
to: 24.863999992609 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.215999990701675
to: 1.21599999070168 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.82400000095367
to: 36.5919999778271 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.384645 0.420857 0.205672 0.033636
0.032696 0.033392 0.031706 0.032306 [error]
Peak 0.051054 0.048812 0.012586 0.011059
0.005951 0.006154 0.005529 0.005336 [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 1.12e-07 1.69e-07 1.93e-07 4.18e-07 5.99e-07 8.92e-07 erg/cm2
Error 1.56e-08 1.56e-08 3.10e-08 1.38e-07 7.04e-08 1.68e-07 erg/cm2
Peak flux Power-law 5.15e-01 3.42e-01 1.48e-01 8.83e-02 1.05e+00 1.09e+00 ph/cm2/s
Error 9.46e-02 5.12e-02 4.31e-02 4.74e-02 1.47e-01 1.58e-01 ph/cm2/s
Fluence Cutoff-PL 1.11e-07 1.71e-07 1.92e-07 3.61e-07 5.93e-07 7.83e-07 erg/cm2
Error 1.66e-08 1.90e-08 3.24e-08 2.36e-07 8.25e-08 2.62e-07 erg/cm2
Peak flux Cutoff-PL 4.91e-01 3.75e-01 1.33e-01 2.35e-02 1.02e+00 1.02e+00 ph/cm2/s
Error 1.05e-01 7.42e-02 5.47e-02 6.46e-02 1.53e-01 2.04e-01 ph/cm2/s
Fluence Band 1.09e-07 1.73e-07 1.89e-07 3.87e-07 5.91e-07 8.59e-07 erg/cm2
Error 1.72e-08 1.98e-08 3.45e-08 2.80e-07 7.74e-08 2.38e-07 erg/cm2
Peak flux Band 4.91e-01 3.76e-01 1.32e-01 4.12e-02 1.02e+00 1.04e+00 ph/cm2/s
Error 7.68e-02 7.31e-02 4.86e-02 5.73e-02 1.47e-01 1.72e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.812 0.183 - - 1.69e-03 1.94e-04 58.529 57
CPL 1.665 0.000 96.1 5000.0 2.05e-03 1.80e-03 58.554 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.207 0.299 - - 6.31e-03 1.38e-03 42.439 57
CPL 1.338 1.296 27.8 5000.0 2.21e-02 1.63e-01 41.366 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: 4.416000 sec.
T50 in the 50-300 keV band: 2.496000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 38.416 -1.824 36.592
T90 31.708 -1.216 30.492
T50 23.448 1.416 24.864
Peak 1.000 0.216 1.216
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
32.6273 +33.1002 0.0147 19.3 -40.1 0.5762 13.0 TRIG_00316204
------------------------------------------
Foreground time interval of the image:
-1.824 15.093 (delta_t = 16.917 [sec])
Background time interval of the image:
-239.608 -198.458 (delta_t = 41.150 [sec])
-197.608 -1.824 (delta_t = 195.784 [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 -1.824 sec. to 36.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81249 ( -0.179894 0.186760 )
Norm@50keV : 1.694851E-03 ( -1.958336E-04 1.915146E-04) )
------------------------------------------------------------
Chi-Squared = 58.52885 using 59 PHA bins.
Reduced chi-squared = 1.026822 for 57 degrees of freedom
Null hypothesis probability = 0.419
Photon flux (15-150 keV) in 38.42 sec: 0.234687 ( -0.021636 0.021638 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98745e-07 ( -6.89793e-08 7.17455e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.824 sec. to 36.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66495 ( )
Epeak [keV] : 96.1140 ( -327.254 9672.74 )
Norm@50keV : 2.050401E-03 ( -2.612985E-04 3.339920E-03) )
------------------------------------------------------------
Chi-Squared = 58.55360 using 59 PHA bins.
Reduced chi-squared = 1.045600 for 56 degrees of freedom
Null hypothesis probability = 0.382
Photon flux (15-150 keV) in 38.42 sec: 0.233926 ( -0.021544 0.021545 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.93389e-07 ( -8.81432e-08 7.67785e-08 ) ergs/cm2
Band function
Time interval is from -1.824 sec. to 36.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22439 ( -8.77561 5.01757 )
beta : -1.88016 ( -8.11984 0.233009 )
Epeak [keV] : 39.8114 ( -39.7114 504.413 )
Norm@50keV : 4.255088E-03 ( -8.737531E-02 207.780 )
------------------------------------------------------------
Chi-Squared = 58.15116 using 59 PHA bins.
Reduced chi-squared = 1.057294 for 55 degrees of freedom
Null hypothesis probability = 0.360
Photon flux (15-150 keV) in 38.42 sec: 0.233216 ( -0.023074 0.022119 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.90884e-07 ( -8.1362e-08 7.34398e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.216 sec. to 1.216 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20733 ( -0.282847 0.314615 )
Norm@50keV : 6.311255E-03 ( -1.395973E-03 1.364580E-03) )
------------------------------------------------------------
Chi-Squared = 42.43917 using 59 PHA bins.
Reduced chi-squared = 0.7445469 for 57 degrees of freedom
Null hypothesis probability = 0.925
Photon flux (15-150 keV) in 1.000 sec: 1.04889 ( -0.147446 0.14751 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.9412e-08 ( -1.08774e-08 1.14382e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.216 sec. to 1.216 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.33791 ( -1.84425 0.748166 )
Epeak [keV] : 27.8293 ( -27.8193 9972.17 )
Norm@50keV : 2.209677E-02 ( -1.780896E-02 0.307307 )
------------------------------------------------------------
Chi-Squared = 41.36644 using 59 PHA bins.
but latest trial 2.03578 gives Chi-Squared = 2.04098
but latest trial 4.287813E-03 gives Chi-Squared = 9.10252
Reduced chi-squared = 0.7386864 for 56 degrees of freedom
Null hypothesis probability = 0.928
Photon flux (15-150 keV) in 1.000 sec: 1.01821 ( -0.150329 0.15478 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.36009e-08 ( -1.11876e-08 1.87637e-08 ) ergs/cm2
Band function
Time interval is from 0.216 sec. to 1.216 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.37948 ( -8.62051 2.53300 )
beta : -3.05178 ( -6.94822 1.05583 )
Epeak [keV] : 27.3969 ( -27.2969 16.8317 )
Norm@50keV : 2.073786E-02 ( -1.533177E-02 1968.15 )
------------------------------------------------------------
Chi-Squared = 41.25995 using 59 PHA bins.
Reduced chi-squared = 0.7501809 for 55 degrees of freedom
Null hypothesis probability = 0.915
Photon flux (15-150 keV) in 1.000 sec: 1.02339 ( -0.143076 0.15125 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.46395e-08 ( -1.20662e-08 1.33884e-08 ) ergs/cm2
Plot creation:
Mon Jul 7 21:14:08 EDT 2008