batgrbproduct Analysis for Trigger=319584
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 Aug 11 00:11:20 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger319584/GCN5_download_cron
======================================================================
Trigger: 00319584 Segment: 000
BAT Trigger Time: 240066615.296 [s; MET]
Trigger Stop: 240066616.32 [s; MET]
UTC: 2008-08-10T13:10:12.287980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 356.779571156542 Dec: 0.319715625427062 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.59
Image Trigger?: NO
Rate S/N Ratio: 14.7309198626562 [ if not an image trigger ]
Image S/N Ratio: 7.59
Flight Position: [ source = BAT ]
RA: 356.779571156542 Dec: 0.319715625427062 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 356.782884470868 Dec: 0.310271681946192 [deg; J2000]
{ 23h 47m 07.9s , +00d 18' 37.0" }
+/- 1.23441646023726 [arcmin] (estimated 90% radius based on SNR)
+/- 0.649447987854364 [arcmin] (formal 1-sigma fit error)
SNR: 22.5143183468497
Angular difference between Flight and Ground position is 0.600497 arcmin
Partial Coding Fraction: 0.6875 [ including projection effects ]
Duration
T90: 108.808000028133 +/- 4.33719033229347
Measured from: -6.32800000905991
to: 102.480000019073 [s; relative to TRIGTIME]
T50: 39.8120000362396 +/- 2.56839250290262
Measured from: 10.3879999816418
to: 50.2000000178814 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 24.6800000071526
to: 25.6800000071526 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.1920000016689
to: 111.43599998951 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.926778 2.476809 2.097291 0.704629
0.068329 0.069487 0.063568 0.058246 [error]
Peak 0.068006 0.086647 0.078138 0.022069
0.007076 0.007502 0.007257 0.006098 [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 5.20e-07 1.05e-06 1.65e-06 5.76e-06 4.60e-06 9.00e-06 erg/cm2
Error 3.59e-08 4.03e-08 6.62e-08 5.57e-07 1.62e-07 5.87e-07 erg/cm2
Peak flux Power-law 5.67e-01 6.43e-01 5.22e-01 7.08e-01 1.99e+00 2.44e+00 ph/cm2/s
Error 9.64e-02 6.43e-02 6.02e-02 1.77e-01 1.81e-01 2.37e-01 ph/cm2/s
Fluence Cutoff-PL 5.20e-07 1.05e-06 1.66e-06 5.72e-06 4.60e-06 8.94e-06 erg/cm2
Error 3.59e-08 4.03e-08 6.63e-08 5.53e-07 1.62e-07 5.83e-07 erg/cm2
Peak flux Cutoff-PL 5.66e-01 6.43e-01 5.23e-01 7.03e-01 1.99e+00 2.44e+00 ph/cm2/s
Error 9.64e-02 6.43e-02 6.03e-02 1.76e-01 1.81e-01 2.36e-01 ph/cm2/s
Fluence Band 5.15e-07 1.05e-06 1.65e-06 5.72e-06 4.60e-06 8.95e-06 erg/cm2
Error 3.55e-08 4.01e-08 6.62e-08 5.53e-07 1.62e-07 4.42e-07 erg/cm2
Peak flux Band 5.78e-01 6.46e-01 5.21e-01 7.02e-01 1.99e+00 2.43e+00 ph/cm2/s
Error 5.08e-02 6.30e-02 4.91e-02 1.07e-01 1.79e-01 2.22e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.346 0.065 - - 3.55e-03 1.14e-04 34.116 57
CPL 1.342 0.066 9989.9 4740.3 3.56e-03 1.14e-04 34.237 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.300 0.169 - - 1.67e-02 1.52e-03 51.138 57
CPL 1.281 0.174 9977.5 0.0 1.70e-02 1.53e-03 51.252 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: 103.488000 sec.
T50 in the 50-300 keV band: 35.200000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 132.628 -21.192 111.436
T90 108.808 -6.328 102.480
T50 39.812 10.388 50.200
Peak 1.000 24.680 25.680
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
356.7829 +0.3103 0.0085 20.5 64.0 1.7550 22.5 TRIG_00319584
------------------------------------------
Foreground time interval of the image:
-21.192 10.205 (delta_t = 31.397 [sec])
Background time interval of the image:
-239.296 -21.192 (delta_t = 218.104 [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 -21.192 sec. to 111.436 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34555 ( -6.520188E-02 6.515789E-02) )
Norm@50keV : 3.550905E-03 ( -1.136013E-04 1.135992E-04) )
------------------------------------------------------------
Chi-Squared = 34.11620 using 59 PHA bins.
Reduced chi-squared = 0.5985298 for 57 degrees of freedom
Null hypothesis probability = 0.993
Photon flux (15-150 keV) in 132.6 sec: 0.427391 ( -0.014793 0.014884 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.60321e-06 ( -1.61122e-07 1.62196e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.192 sec. to 111.436 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34207 ( -6.563282E-02 6.556988E-02) )
Epeak [keV] : 9989.87 ( -9470.41 10.1289 )
Norm@50keV : 3.564543E-03 ( -1.140391E-04 1.140367E-04) )
------------------------------------------------------------
Chi-Squared = 34.23670 using 59 PHA bins.
Reduced chi-squared = 0.6113697 for 56 degrees of freedom
Null hypothesis probability = 0.990
Photon flux (15-150 keV) in 132.6 sec: 0.427158 ( -0.014786 0.014875 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.60367e-06 ( -1.616e-07 1.62143e-07 ) ergs/cm2
Band function
Time interval is from -21.192 sec. to 111.436 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07625 ( -8.92375 3.40521 )
beta : -1.34554 ( -6.510913E-02 6.519938E-02) )
Epeak [keV] : 37.3085 ( -37.2085 9962.69 )
Norm@50keV : 7.009680E-03 ( -7.009680E-03 8.71750 )
------------------------------------------------------------
Chi-Squared = 34.11619 using 59 PHA bins.
Reduced chi-squared = 0.6202943 for 55 degrees of freedom
Null hypothesis probability = 0.988
Photon flux (15-150 keV) in 132.6 sec: 0.426094 ( -0.012783 0.05389 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59968e-06 ( -1.61202e-07 1.6209e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 24.680 sec. to 25.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29981 ( -0.169028 0.169528 )
Norm@50keV : 1.669113E-02 ( -1.522812E-03 1.517486E-03) )
------------------------------------------------------------
Chi-Squared = 51.13838 using 59 PHA bins.
Reduced chi-squared = 0.8971646 for 57 degrees of freedom
Null hypothesis probability = 0.694
Photon flux (15-150 keV) in 1.000 sec: 1.99123 ( -0.1807 0.18097 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65004e-07 ( -1.7495e-08 1.758e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.680 sec. to 25.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28064 ( -0.157641 0.189469 )
Epeak [keV] : 9977.49 ( )
Norm@50keV : 1.703629E-02 ( -1.532804E-03 1.526598E-03) )
------------------------------------------------------------
Chi-Squared = 51.25166 using 59 PHA bins.
Reduced chi-squared = 0.9152083 for 56 degrees of freedom
Null hypothesis probability = 0.655
Photon flux (15-150 keV) in 1.000 sec: 1.99047 ( -0.18064 0.18091 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65006e-07 ( -1.749e-08 1.7598e-08 ) ergs/cm2
Band function
Time interval is from 24.680 sec. to 25.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01961 ( -8.98039 3.76288 )
beta : -1.29984 ( -8.70016 0.169184 )
Epeak [keV] : 51.0995 ( -50.9995 9948.90 )
Norm@50keV : 3.118579E-02 ( -1.599667E-02 10.2780 )
------------------------------------------------------------
Chi-Squared = 51.13824 using 59 PHA bins.
Reduced chi-squared = 0.9297863 for 55 degrees of freedom
Null hypothesis probability = 0.623
Photon flux (15-150 keV) in 1.000 sec: 1.99105 ( -0.17739 0.17979 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64793e-07 ( -1.7408e-08 1.7667e-08 ) ergs/cm2
Plot creation:
Mon Aug 11 00:37:53 EDT 2008