batgrbproduct Analysis for Trigger=291208
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 Dec 14 11:58:49 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger291208/GCN5_download_cron
======================================================================
Trigger: 00291208 Segment: 000
BAT Trigger Time: 211637344 [s; MET]
Trigger Stop: 211637960 [s; MET]
UTC: 2007-09-16T12:09:01.772140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 277.549622935784 Dec: -23.6617619033313 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.51
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.51
Flight Position: [ source = BAT ]
RA: 277.549622935784 Dec: -23.6617619033313 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 277.569373519966 Dec: -23.6614100521855 [deg; J2000]
{ 18h 30m 16.6s , -23d 39' 41.1" }
+/- 3.02804126714405 [arcmin] (estimated 90% radius based on SNR)
+/- 1.74294532963822 [arcmin] (formal 1-sigma fit error)
SNR: 6.24804854052762
RA = 18h 30m 16.6s (277.569374 deg.)
Dec = -23d 39' 41" (-23.661410 deg.)
Angular difference between Flight and Ground position is 1.085617 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 616 +/-
Measured from: 0
to: 616 [s; relative to TRIGTIME]
T50: 616 +/-
Measured from: 0
to: 616 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 616 second)
Measured from: 0
to: 616 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 616 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.941598 0.985983 0.298857 0.135195
0.129365 0.122125 0.110383 0.110387 [error]
Peak 0.941598 0.985983 0.298857 0.135195
0.129365 0.122125 0.110383 0.110387 [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 2.98e-07 3.69e-07 3.33e-07 5.21e-07 1.18e-06 1.52e-06 erg/cm2
Error 5.97e-08 5.79e-08 1.00e-07 3.07e-07 2.26e-07 4.27e-07 erg/cm2
Peak flux Power-law 1.58e-02 1.09e-02 4.91e-03 3.07e-03 3.31e-02 3.47e-02 ph/cm2/s
Error 3.24e-03 1.67e-03 1.42e-03 1.68e-03 4.92e-03 5.24e-03 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 2.88e-07 4.01e-07 2.82e-07 2.96e-07 1.09e-06 1.26e-06 erg/cm2
Error 6.71e-08 7.62e-08 1.25e-07 3.93e-07 2.36e-07 4.64e-07 erg/cm2
Peak flux Band 1.53e-02 1.19e-02 4.24e-03 1.84e-03 3.24e-02 3.33e-02 ph/cm2/s
Error 3.71e-03 2.20e-03 1.69e-03 2.22e-03 5.02e-03 5.70e-03 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.150 0.312 - - 2.05e-04 4.45e-05 38.568 57
CPL 1.265 0.000 29.2 0.0 7.51e-04 0.00e+00 38.755 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.150 0.312 - - 2.05e-04 4.45e-05 38.568 57
CPL 1.265 0.000 29.2 0.0 7.51e-04 0.00e+00 38.755 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 616.000 0.000 616.000
T90 616.000 0.000 616.000
T50 616.000 0.000 616.000
Peak 616.000 0.000 616.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
277.5694 -23.6614 0.0307 13.1 -178.9 2.2939 6.2 TRIG_00291208
------------------------------------------
Foreground time interval of the image:
0.000 306.780 (delta_t = 306.780 [sec])
308.000 616.000 (delta_t = 308.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 306.780000
308.000000 616.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15028 ( -0.298826 0.324659 )
Norm@50keV : 2.054268E-04 ( -4.506586E-05 4.393989E-05) )
------------------------------------------------------------
Chi-Squared = 38.56778 using 59 PHA bins.
Reduced chi-squared = 0.6766277 for 57 degrees of freedom
Null hypothesis probability = 0.971
Photon flux (15-150 keV) in 614.8 sec: 3.314497E-02 ( -0.0049157 0.00491575 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1801e-06 ( -2.20455e-07 2.31294e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 306.780000
308.000000 616.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26495 ( )
Epeak [keV] : 29.1859 ( )
Norm@50keV : 7.506990E-04 ( )
------------------------------------------------------------
Chi-Squared = 38.75507 using 59 PHA bins.
Reduced chi-squared = 0.6920548 for 56 degrees of freedom
Null hypothesis probability = 0.962
Photon flux (15-150 keV) in 614.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 306.780000
308.000000 616.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52259 ( -8.47741 6.01790 )
beta : -2.28547 ( -7.71453 0.393314 )
Epeak [keV] : 26.3859 ( -26.2859 216.591 )
Norm@50keV : 5.180045E-04 ( -5.418011E-03 28.4147 )
------------------------------------------------------------
Chi-Squared = 37.87911 using 59 PHA bins.
Reduced chi-squared = 0.6887111 for 55 degrees of freedom
Null hypothesis probability = 0.962
Photon flux (15-150 keV) in 614.8 sec: 3.244355E-02 ( -0.00502379 0.00501702 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09452e-06 ( -2.38032e-07 2.3339e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 308.000 sec. to 616.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15028 ( -0.298826 0.324659 )
Norm@50keV : 2.054268E-04 ( -4.506586E-05 4.393989E-05) )
------------------------------------------------------------
Chi-Squared = 38.56778 using 59 PHA bins.
Reduced chi-squared = 0.6766277 for 57 degrees of freedom
Null hypothesis probability = 0.971
Photon flux (15-150 keV) in 614.8 sec: 3.314497E-02 ( -0.0049157 0.00491575 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1801e-06 ( -2.20455e-07 2.31294e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 308.000 sec. to 616.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26495 ( )
Epeak [keV] : 29.1859 ( )
Norm@50keV : 7.506990E-04 ( )
------------------------------------------------------------
Chi-Squared = 38.75507 using 59 PHA bins.
Reduced chi-squared = 0.6920548 for 56 degrees of freedom
Null hypothesis probability = 0.962
Photon flux (15-150 keV) in 614.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 308.000 sec. to 616.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52259 ( -8.47741 6.01790 )
beta : -2.28547 ( -7.71453 0.393314 )
Epeak [keV] : 26.3859 ( -26.2859 216.591 )
Norm@50keV : 5.180045E-04 ( -5.418011E-03 28.4147 )
------------------------------------------------------------
Chi-Squared = 37.87911 using 59 PHA bins.
Reduced chi-squared = 0.6887111 for 55 degrees of freedom
Null hypothesis probability = 0.962
Photon flux (15-150 keV) in 614.8 sec: 3.244355E-02 ( -0.00502379 0.00501702 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09452e-06 ( -2.38032e-07 2.3339e-07 ) ergs/cm2
Plot creation:
Fri Dec 14 12:20:55 EST 2007