batgrbproduct Analysis for Trigger=306708
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): Wed Mar 19 01:46:44 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger306708/GCN5_download_cron
======================================================================
Trigger: 00306708 Segment: 000
BAT Trigger Time: 227540015.36 [s; MET]
Trigger Stop: 227540015.872 [s; MET]
UTC: 2008-03-18T13:33:32.707940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 53.3554395077728 Dec: -40.636419361157 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.1
Image Trigger?: NO
Rate S/N Ratio: 4.24264068711928 [ if not an image trigger ]
Image S/N Ratio: 5.1
Flight Position: [ source = BAT ]
RA: 53.3554395077728 Dec: -40.636419361157 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 53.3065789876928 Dec: -40.6004954017853 [deg; J2000]
{ 03h 33m 13.6s , -40d 36' 01.8" }
+/- 4.71630567718466 [arcmin] (estimated 90% radius based on SNR)
+/- 3.08571903395532 [arcmin] (formal 1-sigma fit error)
SNR: 3.31764479950091
RA = 3h 33m 13.6s (53.306579 deg.)
Dec = -40d 36' 2" (-40.600495 deg.)
Angular difference between Flight and Ground position is 3.098035 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 0.511999994516373 +/-
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
T50: 0.511999994516373 +/-
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.511999994516373 second)
Measured from: -1.49011611938477e-08
to: 0.511999979615211 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.003960 0.013763 0.009623 0.002085
0.003408 0.003648 0.003504 0.003851 [error]
Peak 0.003960 0.013763 0.009623 0.002085
0.003408 0.003648 0.003504 0.003851 [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-09 3.97e-09 6.12e-09 2.07e-08 1.71e-08 3.27e-08 erg/cm2
Error 1.18e-09 1.61e-09 3.11e-09 2.27e-08 7.77e-09 2.55e-08 erg/cm2
Peak flux Power-law 1.25e-01 1.36e-01 1.05e-01 1.33e-01 4.15e-01 4.99e-01 ph/cm2/s
Error 7.52e-02 5.59e-02 5.20e-02 1.53e-01 1.65e-01 2.12e-01 ph/cm2/s
Fluence Cutoff-PL 1.43e-09 5.32e-09 6.16e-09 1.30e-09 1.41e-08 1.40e-08 erg/cm2
Error 1.05e-09 2.33e-09 4.32e-09 1.09e-08 7.15e-09 1.37e-08 erg/cm2
Peak flux Cutoff-PL 8.77e-02 1.79e-01 1.12e-01 1.32e-02 3.91e-01 3.93e-01 ph/cm2/s
Error 7.55e-02 7.96e-02 9.17e-02 7.21e-02 1.57e-01 1.59e-01 ph/cm2/s
Fluence Band 1.59e-09 5.13e-09 6.39e-09 1.97e-09 1.47e-08 1.60e-08 erg/cm2
Error 9.86e-10 1.45e-09 2.91e-09 1.79e-09 3.40e-09 0.00e+00 erg/cm2
Peak flux Band 9.03e-02 1.77e-01 1.13e-01 1.48e-02 3.93e-01 3.95e-01 ph/cm2/s
Error 4.24e-02 5.43e-02 4.87e-02 5.52e-02 1.49e-01 1.52e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.369 0.638 - - 3.44e-03 1.41e-03 55.393 57
CPL -1.242 2.200 56.2 421.3 8.89e-02 3.33e-01 52.592 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.369 0.638 - - 3.44e-03 1.41e-03 55.393 57
CPL -1.242 2.200 56.2 421.3 8.89e-02 3.33e-01 52.592 0
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 0.512 0.000 0.512
T90 0.512 0.000 0.512
T50 0.512 0.000 0.512
Peak 0.512 -0.000 0.512
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
53.3066 -40.6005 0.0577 18.4 -36.6 0.0232 3.3 TRIG_00306708
------------------------------------------
Foreground time interval of the image:
0.000 0.512 (delta_t = 0.512 [sec])
Background time interval of the image:
-60.360 -56.146 (delta_t = 4.214 [sec])
-55.360 -12.890 (delta_t = 42.470 [sec])
-11.360 -7.360 (delta_t = 4.000 [sec])
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 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36863 ( -0.626621 0.648683 )
Norm@50keV : 3.437891E-03 ( -1.428964E-03 1.398691E-03) )
------------------------------------------------------------
Chi-Squared = 55.39314 using 59 PHA bins.
Reduced chi-squared = 0.9718095 for 57 degrees of freedom
Null hypothesis probability = 0.536
Photon flux (15-150 keV) in 0.5120 sec: 0.415414 ( -0.164798 0.165067 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70862e-08 ( -7.44264e-09 8.09595e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Parameters : value lower 90% higher 90%
Photon index: -1.24188 ( -1.75812 2.64276 )
Epeak [keV] : 56.2348 ( -20.1063 822.476 )
Norm@50keV : 8.890737E-02 ( -8.890737E-02 0.577344 )
------------------------------------------------------------
Chi-Squared = 52.59206 using 59 PHA bins.
but latest trial 1.40088 gives Chi-Squared = 2.82587
but latest trial 36.1285 gives Chi-Squared = 2.71789
Reduced chi-squared = 0.9391440 for 56 degrees of freedom
Null hypothesis probability = 0.605
Photon flux (15-150 keV) in 0.5120 sec: 0.390690 ( -0.152928 0.161744 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40785e-08 ( -6.15224e-09 8.14756e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.32168 ( -2.73509 3.67832 )
beta : -9.35458 ( -0.645418 19.3544 )
Epeak [keV] : 55.8752 ( -13.3947 30.7243 )
Norm@50keV : 9.817197E-02 ( -18.8454 6.87182 )
------------------------------------------------------------
Chi-Squared = 52.59010 using 59 PHA bins.
Reduced chi-squared = 0.9561836 for 55 degrees of freedom
Null hypothesis probability = 0.567
Photon flux (15-150 keV) in 0.5120 sec: 0.393463 ( -0.144653 0.15421 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47244e-08 ( -3.40229e-09 3.40234e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36863 ( -0.626621 0.648683 )
Norm@50keV : 3.437891E-03 ( -1.428964E-03 1.398691E-03) )
------------------------------------------------------------
Chi-Squared = 55.39314 using 59 PHA bins.
Reduced chi-squared = 0.9718095 for 57 degrees of freedom
Null hypothesis probability = 0.536
Photon flux (15-150 keV) in 0.5120 sec: 0.415414 ( -0.164798 0.165067 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70862e-08 ( -7.44264e-09 8.09595e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Parameters : value lower 90% higher 90%
Photon index: -1.24188 ( -1.75812 2.64276 )
Epeak [keV] : 56.2348 ( -20.1063 822.476 )
Norm@50keV : 8.890737E-02 ( -8.890737E-02 0.577344 )
------------------------------------------------------------
Chi-Squared = 52.59206 using 59 PHA bins.
but latest trial 1.40088 gives Chi-Squared = 2.82587
but latest trial 36.1285 gives Chi-Squared = 2.71789
Reduced chi-squared = 0.9391440 for 56 degrees of freedom
Null hypothesis probability = 0.605
Photon flux (15-150 keV) in 0.5120 sec: 0.390690 ( -0.152928 0.161744 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40785e-08 ( -6.15224e-09 8.14756e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.32168 ( -2.73509 3.67832 )
beta : -9.35458 ( -0.645418 19.3541 )
Epeak [keV] : 55.8752 ( -13.3947 30.7243 )
Norm@50keV : 9.817197E-02 ( -18.8454 6.87182 )
------------------------------------------------------------
Chi-Squared = 52.59010 using 59 PHA bins.
Reduced chi-squared = 0.9561836 for 55 degrees of freedom
Null hypothesis probability = 0.567
Photon flux (15-150 keV) in 0.5120 sec: 0.393463 ( -0.144653 0.15421 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47244e-08 ( -3.40229e-09 3.40234e-09 ) ergs/cm2
Plot creation:
Wed Mar 19 01:58:47 EDT 2008