batgrbproduct Analysis for Trigger=302788
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 Feb 9 07:13:29 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger302788/GCN5_download_cron
======================================================================
Trigger: 00302788 Segment: 000
BAT Trigger Time: 224195528 [s; MET]
Trigger Stop: 224195592 [s; MET]
UTC: 2008-02-08T20:32:05.439280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.296802749164 Dec: -26.6430523053497 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.57
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.57
Flight Position: [ source = BAT ]
RA: 267.296802749164 Dec: -26.6430523053497 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.326830331094 Dec: -26.6932601221641 [deg; J2000]
{ 17h 49m 18.4s , -26d 41' 35.7" }
+/- 2.82952063943869 [arcmin] (estimated 90% radius based on SNR)
+/- 1.31260015226466 [arcmin] (formal 1-sigma fit error)
SNR: 6.88357875375636
RA = 17h 49m 18.4s (267.326830 deg.)
Dec = -26d 41' 36" (-26.693260 deg.)
Angular difference between Flight and Ground position is 3.415708 arcmin
Partial Coding Fraction: 1.015625 [ 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 0.491709 0.079125 0.014955 0.056523
0.047680 0.042318 0.035977 0.031158 [error]
Peak 0.491709 0.079125 0.014955 0.056523
0.047680 0.042318 0.035977 0.031158 [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 1.20e-07 6.12e-08 1.93e-08 7.82e-09 2.04e-07 2.08e-07 erg/cm2
Error 2.29e-08 2.11e-08 1.40e-08 1.15e-08 4.99e-08 5.38e-08 erg/cm2
Peak flux Power-law 6.30e-02 1.83e-02 2.90e-03 5.24e-04 8.46e-02 8.48e-02 ph/cm2/s
Error 1.23e-02 6.02e-03 2.68e-03 7.32e-04 1.65e-02 1.66e-02 ph/cm2/s
Fluence Cutoff-PL 1.37e-07 4.66e-08 4.02e-10 4.00e-15 1.84e-07 1.84e-07 erg/cm2
Error 2.53e-08 2.10e-08 2.14e-09 9.14e-12 3.50e-08 3.50e-08 erg/cm2
Peak flux Cutoff-PL 7.08e-02 1.53e-02 7.33e-05 3.90e-10 8.62e-02 8.62e-02 ph/cm2/s
Error 1.32e-02 6.37e-03 3.69e-04 8.33e-07 1.56e-02 1.56e-02 ph/cm2/s
Fluence Band 1.18e-07 6.18e-08 1.98e-08 3.40e-09 1.97e-07 2.43e-07 erg/cm2
Error 2.26e-08 1.31e-08 1.02e-08 5.13e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 6.30e-02 1.85e-02 2.33e-03 7.76e-05 8.67e-02 8.49e-02 ph/cm2/s
Error 1.28e-02 3.90e-03 1.62e-02 1.60e-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 3.588 0.590 - - 1.96e-04 1.50e-04 52.936 57
CPL -2.491 0.000 16.4 2.3 1.57e+01 4.72e+01 46.213 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.588 0.590 - - 1.96e-04 1.50e-04 52.936 57
CPL -2.491 0.000 16.4 2.3 1.57e+01 4.72e+01 46.213 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
267.3268 -26.6933 0.0280 2.3 -120.8 0.5956 6.9 TRIG_00302788
------------------------------------------
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: 3.58806 ( -0.466228 0.713341 )
Norm@50keV : 1.959175E-04 ( -1.959175E-04 1.040168E-04) )
------------------------------------------------------------
Chi-Squared = 52.93569 using 59 PHA bins.
Reduced chi-squared = 0.9286963 for 57 degrees of freedom
Null hypothesis probability = 0.628
Photon flux (15-150 keV) in 64.00 sec: 8.464107E-02 ( -0.0164657 0.0165519 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04403e-07 ( -4.75667e-08 5.21747e-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: -2.49072 ( )
Epeak [keV] : 16.3666 ( -2.18083 2.49331 )
Norm@50keV : 15.7386 ( -39.2162 55.2738 )
------------------------------------------------------------
Chi-Squared = 46.21332 using 59 PHA bins.
Reduced chi-squared = 0.8252379 for 56 degrees of freedom
Null hypothesis probability = 0.821
Photon flux (15-150 keV) in 64.00 sec: 8.618167E-02 ( -0.0156101 0.0156343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83914e-07 ( -3.51315e-08 3.48096e-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 : -1.43712 ( -0.542440 0.766551 )
beta : -3.86513 ( -0.630334 13.2383 )
Epeak [keV] : 14.2322 ( -14.1322 9985.77 )
Norm@50keV : 2.643866E-03 ( -1.194113E-02 1.579591E-02) )
------------------------------------------------------------
Chi-Squared = 64.08627 using 59 PHA bins.
Reduced chi-squared = 1.165205 for 55 degrees of freedom
Null hypothesis probability = 0.188
Photon flux (15-150 keV) in 64.00 sec: 8.665064E-02 ( -0.0166739 0.0156814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96584e-07 ( 0 0 ) 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: 3.58806 ( -0.466228 0.713341 )
Norm@50keV : 1.959175E-04 ( -1.959175E-04 1.040168E-04) )
------------------------------------------------------------
Chi-Squared = 52.93569 using 59 PHA bins.
Reduced chi-squared = 0.9286963 for 57 degrees of freedom
Null hypothesis probability = 0.628
Photon flux (15-150 keV) in 64.00 sec: 8.464107E-02 ( -0.0164657 0.0165519 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04403e-07 ( -4.75667e-08 5.21747e-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: -2.49072 ( )
Epeak [keV] : 16.3666 ( -2.18083 2.49331 )
Norm@50keV : 15.7386 ( -39.2162 55.2738 )
------------------------------------------------------------
Chi-Squared = 46.21332 using 59 PHA bins.
Reduced chi-squared = 0.8252379 for 56 degrees of freedom
Null hypothesis probability = 0.821
Photon flux (15-150 keV) in 64.00 sec: 8.618167E-02 ( -0.0156101 0.0156343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83914e-07 ( -3.51315e-08 3.48096e-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 : -1.43712 ( -0.542440 0.766551 )
beta : -3.86513 ( -0.630334 13.2383 )
Epeak [keV] : 14.2322 ( -14.1322 9985.77 )
Norm@50keV : 2.643866E-03 ( -1.194113E-02 1.579591E-02) )
------------------------------------------------------------
Chi-Squared = 64.08627 using 59 PHA bins.
Reduced chi-squared = 1.165205 for 55 degrees of freedom
Null hypothesis probability = 0.188
Photon flux (15-150 keV) in 64.00 sec: 8.665064E-02 ( -0.0166739 0.0156814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96584e-07 ( 0 0 ) ergs/cm2
Plot creation:
Sat Feb 9 07:40:39 EST 2008