batgrbproduct Analysis for Trigger=296961
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 01:13:43 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger296961/GCN5_download_cron
======================================================================
Trigger: 00296961 Segment: 000
BAT Trigger Time: 217221512 [s; MET]
Trigger Stop: 217221576 [s; MET]
UTC: 2007-11-20T03:18:29.625900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 152.452187919959 Dec: -58.2930135421541 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.16
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.16
Flight Position: [ source = BAT ]
RA: 152.452187919959 Dec: -58.2930135421541 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 152.488690992362 Dec: -58.2852591696322 [deg; J2000]
{ 10h 09m 57.3s , -58d 17' 06.9" }
+/- 2.61117595765872 [arcmin] (estimated 90% radius based on SNR)
+/- 1.23351782052997 [arcmin] (formal 1-sigma fit error)
SNR: 7.72037120695702
RA = 10h 9m 57.3s (152.488691 deg.)
Dec = -58d 17' 7" (-58.285259 deg.)
Angular difference between Flight and Ground position is 1.241695 arcmin
Partial Coding Fraction: 0.6484375 [ 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 0.365930 0.299926 0.004515 0.007053
0.050792 0.051234 0.045681 0.041881 [error]
Peak 0.365930 0.299926 0.004515 0.007053
0.050792 0.051234 0.045681 0.041881 [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 1.47e-07 1.14e-07 5.91e-08 4.43e-08 3.40e-07 3.64e-07 erg/cm2
Error 2.95e-08 2.85e-08 3.03e-08 4.21e-08 7.94e-08 1.00e-07 erg/cm2
Peak flux Power-law 7.64e-02 3.32e-02 8.62e-03 2.76e-03 1.20e-01 1.21e-01 ph/cm2/s
Error 1.57e-02 7.96e-03 4.28e-03 2.94e-03 2.18e-02 2.22e-02 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 1.43e-07 1.33e-07 2.26e-08 3.86e-10 2.99e-07 3.01e-07 erg/cm2
Error 2.31e-08 3.73e-08 1.51e-08 1.25e-08 6.86e-08 5.38e-08 erg/cm2
Peak flux Band 7.37e-02 3.71e-02 4.73e-03 6.44e-04 1.16e-01 1.17e-01 ph/cm2/s
Error 1.80e-02 8.51e-03 4.09e-03 1.18e-03 2.12e-02 2.14e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.947 0.458 - - 4.53e-04 1.75e-04 68.238 57
CPL 0.519 0.000 18.9 0.0 2.06e-02 0.00e+00 64.827 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.947 0.458 - - 4.53e-04 1.75e-04 68.238 57
CPL 0.519 0.000 18.9 0.0 2.06e-02 0.00e+00 64.827 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
152.4887 -58.2853 0.0248 38.1 -160.0 0.8107 7.7 TRIG_00296961
------------------------------------------
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: 2.94657 ( -0.413192 0.502714 )
Norm@50keV : 4.532240E-04 ( -1.692189E-04 1.806994E-04) )
------------------------------------------------------------
Chi-Squared = 68.23779 using 59 PHA bins.
Reduced chi-squared = 1.197154 for 57 degrees of freedom
Null hypothesis probability = 0.146
Photon flux (15-150 keV) in 64.00 sec: 0.119901 ( -0.0218166 0.021855 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40132e-07 ( -7.6455e-08 8.24154e-08 ) 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: 0.519274 ( )
Epeak [keV] : 18.8976 ( )
Norm@50keV : 2.062019E-02 ( )
------------------------------------------------------------
Chi-Squared = 64.82733 using 59 PHA bins.
Reduced chi-squared = 1.157631 for 56 degrees of freedom
Null hypothesis probability = 0.196
Photon flux (15-150 keV) in 64.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : -1.45763 ( -0.756184 0.652869 )
beta : -9.14009 ( -0.859913 6.24283 )
Epeak [keV] : 12.4763 ( -6.18815 13.7951 )
Norm@50keV : 4.251970E-03 ( -7.954160E-02 9.25077 )
------------------------------------------------------------
Chi-Squared = 65.32953 using 59 PHA bins.
Reduced chi-squared = 1.187810 for 55 degrees of freedom
Null hypothesis probability = 0.161
Photon flux (15-150 keV) in 64.00 sec: 0.115714 ( -0.0206683 0.021702 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99497e-07 ( -5.82861e-08 7.89235e-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: 2.94657 ( -0.413192 0.502714 )
Norm@50keV : 4.532240E-04 ( -1.692189E-04 1.806994E-04) )
------------------------------------------------------------
Chi-Squared = 68.23779 using 59 PHA bins.
Reduced chi-squared = 1.197154 for 57 degrees of freedom
Null hypothesis probability = 0.146
Photon flux (15-150 keV) in 64.00 sec: 0.119901 ( -0.0218166 0.021855 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40132e-07 ( -7.6455e-08 8.24154e-08 ) 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: 0.519274 ( )
Epeak [keV] : 18.8976 ( )
Norm@50keV : 2.062019E-02 ( )
------------------------------------------------------------
Chi-Squared = 64.82733 using 59 PHA bins.
Reduced chi-squared = 1.157631 for 56 degrees of freedom
Null hypothesis probability = 0.196
Photon flux (15-150 keV) in 64.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : -1.45763 ( -0.756184 0.652869 )
beta : -9.14009 ( -0.859913 6.24283 )
Epeak [keV] : 12.4763 ( -6.18815 13.7951 )
Norm@50keV : 4.251970E-03 ( -7.954160E-02 9.25077 )
------------------------------------------------------------
Chi-Squared = 65.32953 using 59 PHA bins.
Reduced chi-squared = 1.187810 for 55 degrees of freedom
Null hypothesis probability = 0.161
Photon flux (15-150 keV) in 64.00 sec: 0.115714 ( -0.0206683 0.021702 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99497e-07 ( -5.82861e-08 7.89235e-08 ) ergs/cm2
Plot creation:
Sat Dec 15 01:26:43 EST 2007