batgrbproduct Analysis for Trigger=296739
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): Sat Dec 15 00:15:12 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger296739/GCN5_download_cron
======================================================================
Trigger: 00296739 Segment: 000
BAT Trigger Time: 216927640 [s; MET]
Trigger Stop: 216927960 [s; MET]
UTC: 2007-11-16T17:40:37.633640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 104.554858661031 Dec: -7.20234587488301 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.01
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.01
Flight Position: [ source = BAT ]
RA: 104.554858661031 Dec: -7.20234587488301 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 104.589721444087 Dec: -7.23315876089834 [deg; J2000]
{ 06h 58m 21.5s , -07d 13' 59.4" }
+/- 2.87153764743402 [arcmin] (estimated 90% radius based on SNR)
+/- 1.37746341901226 [arcmin] (formal 1-sigma fit error)
SNR: 6.74014242375317
RA = 6h 58m 21.5s (104.589721 deg.)
Dec = -7d 13' 59" (-7.233159 deg.)
Angular difference between Flight and Ground position is 2.779277 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.758496 0.325924 0.223875 0.106652
0.092539 0.092653 0.082954 0.075257 [error]
Peak 0.758496 0.325924 0.223875 0.106652
0.092539 0.092653 0.082954 0.075257 [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 2.00e-07 1.82e-07 1.15e-07 1.11e-07 5.43e-07 6.08e-07 erg/cm2
Error 4.63e-08 5.07e-08 6.84e-08 1.29e-07 1.58e-07 2.35e-07 erg/cm2
Peak flux Power-law 2.07e-02 1.05e-02 3.32e-03 1.34e-03 3.53e-02 3.58e-02 ph/cm2/s
Error 4.91e-03 2.78e-03 1.91e-03 1.64e-03 7.05e-03 7.34e-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 4.24e-07 6.32e-07 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 Band 2.14e-02 1.05e-02 3.01e-03 1.08e-03 3.56e-02 3.72e-02 ph/cm2/s
Error 5.11e-03 2.72e-03 1.04e-03 1.50e-03 6.94e-03 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.667 0.558 - - 1.61e-04 7.04e-05 52.481 57
CPL 1.720 0.000 8.7 0.0 7.37e-04 0.00e+00 54.572 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.667 0.558 - - 1.61e-04 7.04e-05 52.481 57
CPL 1.720 0.000 8.7 0.0 7.37e-04 0.00e+00 54.572 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
104.5897 -7.2332 0.0286 17.8 51.9 1.4163 6.7 TRIG_00296739
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [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 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66681 ( -0.502342 0.614164 )
Norm@50keV : 1.614638E-04 ( -6.876954E-05 7.198808E-05) )
------------------------------------------------------------
Chi-Squared = 52.48136 using 59 PHA bins.
Reduced chi-squared = 0.9207256 for 57 degrees of freedom
Null hypothesis probability = 0.645
Photon flux (15-150 keV) in 320.0 sec: 3.525591E-02 ( -0.00703514 0.00705688 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43328e-07 ( -1.48765e-07 1.67229e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71995 ( )
Epeak [keV] : 8.65718 ( )
Norm@50keV : 7.371405E-04 ( )
------------------------------------------------------------
Chi-Squared = 54.57250 using 59 PHA bins.
Reduced chi-squared = 0.9745089 for 56 degrees of freedom
Null hypothesis probability = 0.529
Photon flux (15-150 keV) in 320.0 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61051 ( -13.7757 1.22426 )
beta : -9.35722 ( -0.885218 0.530645 )
Epeak [keV] : 15.4546 ( -15.3502 12.1052 )
Norm@50keV : 6.606020E-04 ( -100.400 819.302 )
------------------------------------------------------------
Chi-Squared = 55.35301 using 59 PHA bins.
Reduced chi-squared = 1.006418 for 55 degrees of freedom
Null hypothesis probability = 0.461
Photon flux (15-150 keV) in 320.0 sec: 3.559799E-02 ( -0.00693904 0.00693979 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66681 ( -0.502342 0.614164 )
Norm@50keV : 1.614638E-04 ( -6.876954E-05 7.198808E-05) )
------------------------------------------------------------
Chi-Squared = 52.48136 using 59 PHA bins.
Reduced chi-squared = 0.9207256 for 57 degrees of freedom
Null hypothesis probability = 0.645
Photon flux (15-150 keV) in 320.0 sec: 3.525591E-02 ( -0.00703514 0.00705688 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43328e-07 ( -1.48765e-07 1.67229e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71995 ( )
Epeak [keV] : 8.65718 ( )
Norm@50keV : 7.371405E-04 ( )
------------------------------------------------------------
Chi-Squared = 54.57250 using 59 PHA bins.
Reduced chi-squared = 0.9745089 for 56 degrees of freedom
Null hypothesis probability = 0.529
Photon flux (15-150 keV) in 320.0 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61051 ( -13.7757 1.22426 )
beta : -9.35722 ( -0.885218 0.530645 )
Epeak [keV] : 15.4546 ( -15.3502 12.1052 )
Norm@50keV : 6.606020E-04 ( -100.400 819.302 )
------------------------------------------------------------
Chi-Squared = 55.35301 using 59 PHA bins.
Reduced chi-squared = 1.006418 for 55 degrees of freedom
Null hypothesis probability = 0.461
Photon flux (15-150 keV) in 320.0 sec: 3.559799E-02 ( -0.00693904 0.00693979 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Dec 15 00:28:30 EST 2007