batgrbproduct Analysis for Trigger=317393
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 Jul 20 12:31:12 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger317393/GCN5_download_cron
======================================================================
Trigger: 00317393 Segment: 000
BAT Trigger Time: 238206224 [s; MET]
Trigger Stop: 238206288 [s; MET]
UTC: 2008-07-20T00:23:41.046060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 162.521270856645 Dec: -10.4954986010427 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.29
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.29
Flight Position: [ source = BAT ]
RA: 162.521270856645 Dec: -10.4954986010427 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 162.480725114924 Dec: -10.4613242630678 [deg; J2000]
{ 10h 49m 55.4s , -10d 27' 40.8" }
+/- 4.59839780762902 [arcmin] (estimated 90% radius based on SNR)
+/- 3.25673368512284 [arcmin] (formal 1-sigma fit error)
SNR: 3.43983498680394
Angular difference between Flight and Ground position is 3.150696 arcmin
Partial Coding Fraction: 0.4296875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.307138 0.274598 -0.059842 -0.064364
0.066157 0.066828 0.061328 0.057485 [error]
Peak 0.307138 0.274598 -0.059842 -0.064364
0.066157 0.066828 0.061328 0.057485 [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 9.61e-08 9.09e-08 5.98e-08 6.10e-08 2.72e-07 3.06e-07 erg/cm2
Error 3.41e-08 3.46e-08 4.12e-08 8.75e-08 1.09e-07 1.54e-07 erg/cm2
Peak flux Power-law 4.96e-02 2.62e-02 8.61e-03 3.66e-03 8.64e-02 8.82e-02 ph/cm2/s
Error 1.79e-02 9.67e-03 5.75e-03 4.91e-03 2.79e-02 2.86e-02 ph/cm2/s
Fluence Cutoff-PL 9.68e-08 1.29e-07 1.55e-08 3.31e-11 2.42e-07 2.42e-07 erg/cm2
Error 3.24e-08 4.54e-08 2.58e-08 1.50e-09 7.40e-08 7.40e-08 erg/cm2
Peak flux Cutoff-PL 4.83e-02 3.80e-02 2.57e-03 2.86e-06 8.88e-02 8.88e-02 ph/cm2/s
Error 1.49e-02 1.23e-02 4.05e-03 1.27e-04 2.53e-02 2.53e-02 ph/cm2/s
Fluence Band 7.75e-08 1.29e-07 1.23e-08 8.81e-11 2.39e-07 2.54e-07 erg/cm2
Error 5.08e-08 1.07e-08 1.39e-09 6.80e-08 1.25e-07 0.00e+00 erg/cm2
Peak flux Band 5.34e-02 2.78e-02 7.68e-03 1.29e-03 8.90e-02 8.52e-02 ph/cm2/s
Error 1.79e-02 7.99e-03 1.71e-03 2.54e-02 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.587 0.634 - - 4.17e-04 3.19e-04 50.103 57
CPL -2.500 0.000 27.0 5.9 1.34e+00 3.91e+00 42.878 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.587 0.634 - - 4.17e-04 3.19e-04 50.103 57
CPL -2.500 0.000 27.0 5.9 1.34e+00 3.91e+00 42.878 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
162.4807 -10.4613 0.0558 43.0 -155.8 0.4636 3.4 TRIG_00317393
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.58721 ( -0.544373 0.722739 )
Norm@50keV : 4.170276E-04 ( -4.170276E-04 2.210652E-04) )
------------------------------------------------------------
Chi-Squared = 50.10287 using 59 PHA bins.
Reduced chi-squared = 0.8789978 for 57 degrees of freedom
Null hypothesis probability = 0.729
Photon flux (15-150 keV) in 64.00 sec: 8.640133E-02 ( -0.0278068 0.0280517 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71752e-07 ( -1.02376e-07 1.14932e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49993 ( )
Epeak [keV] : 27.0409 ( -5.38446 6.32502 )
Norm@50keV : 1.34434 ( -1.90279 5.92273 )
------------------------------------------------------------
Chi-Squared = 42.87828 using 59 PHA bins.
Reduced chi-squared = 0.7656837 for 56 degrees of freedom
Null hypothesis probability = 0.901
Photon flux (15-150 keV) in 64.00 sec: 8.877822E-02 ( -0.0253249 0.0253258 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41634e-07 ( -7.23725e-08 7.56538e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.37486 ( -1.06871 6.32733 )
beta : -8.26212 ( -1.73788 5.82514 )
Epeak [keV] : 16.3396 ( -16.2396 22.3865 )
Norm@50keV : 2.917358E-03 ( -14.1049 78.1878 )
------------------------------------------------------------
Chi-Squared = 46.94624 using 59 PHA bins.
Reduced chi-squared = 0.8535681 for 55 degrees of freedom
Null hypothesis probability = 0.772
Photon flux (15-150 keV) in 64.00 sec: 8.901737E-02 ( -0.0254795 0.0253836 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38764e-07 ( -6.80653e-08 6.78355e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.58721 ( -0.544373 0.722739 )
Norm@50keV : 4.170276E-04 ( -4.170276E-04 2.210652E-04) )
------------------------------------------------------------
Chi-Squared = 50.10287 using 59 PHA bins.
Reduced chi-squared = 0.8789978 for 57 degrees of freedom
Null hypothesis probability = 0.729
Photon flux (15-150 keV) in 64.00 sec: 8.640133E-02 ( -0.0278068 0.0280517 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71752e-07 ( -1.02376e-07 1.14932e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49993 ( )
Epeak [keV] : 27.0409 ( -5.38446 6.32502 )
Norm@50keV : 1.34434 ( -1.90279 5.92273 )
------------------------------------------------------------
Chi-Squared = 42.87828 using 59 PHA bins.
Reduced chi-squared = 0.7656837 for 56 degrees of freedom
Null hypothesis probability = 0.901
Photon flux (15-150 keV) in 64.00 sec: 8.877822E-02 ( -0.0253249 0.0253258 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41634e-07 ( -7.23725e-08 7.56538e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.37486 ( -0.736533 6.32733 )
beta : -8.26212 ( -1.73788 5.82551 )
Epeak [keV] : 16.3396 ( -9.68256 22.3865 )
Norm@50keV : 2.917358E-03 ( -14.1049 78.1878 )
------------------------------------------------------------
Chi-Squared = 46.94624 using 59 PHA bins.
Reduced chi-squared = 0.8535681 for 55 degrees of freedom
Null hypothesis probability = 0.772
Photon flux (15-150 keV) in 64.00 sec: 8.901737E-02 ( -0.0254795 0.0253836 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38764e-07 ( -6.80653e-08 6.78355e-08 ) ergs/cm2
Plot creation:
Sun Jul 20 13:20:46 EDT 2008