batgrbproduct Analysis for Trigger=347982
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 v2.42
Process Start Time (local time): Mon Mar 30 20:28:23 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger347982/GCN5_download_cron
======================================================================
Trigger: 00347982 Segment: 000
BAT Trigger Time: 260093664 [s; MET]
Trigger Stop: 260093665.024 [s; MET]
UTC: 2009-03-30T08:14:19.383200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 58.9479892787006 Dec: 37.5278626942129 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.65
Image Trigger?: NO
Rate S/N Ratio: 20.1990098767242 [ if not an image trigger ]
Image S/N Ratio: 5.65
Flight Position: [ source = BAT ]
RA: 58.9479892787006 Dec: 37.5278626942129 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 58.8756418197067 Dec: 37.5451676588031 [deg; J2000]
{ 03h 55m 30.2s , +37d 32' 42.6" }
+/- 4.75103638373658 [arcmin] (estimated 90% radius based on SNR)
+/- 4.4079236498083 [arcmin] (formal 1-sigma fit error)
SNR: 3.28305282751133
Angular difference between Flight and Ground position is 3.595330 arcmin
Partial Coding Fraction: 0.25 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.063818 -0.004936 0.006904 0.008513
0.012026 0.011876 0.011405 0.011082 [error]
Peak 0.063818 -0.004936 0.006904 0.008513
0.012026 0.011876 0.011405 0.011082 [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 2.05e-08 7.53e-09 1.59e-09 4.00e-10 2.99e-08 3.02e-08 erg/cm2
Error 7.42e-09 5.53e-09 2.81e-09 1.66e-09 1.33e-08 1.37e-08 erg/cm2
Peak flux Power-law 6.83e-01 1.40e-01 1.57e-02 1.82e-03 8.43e-01 8.39e-01 ph/cm2/s
Error 2.48e-01 1.01e-01 2.60e-02 6.64e-03 3.16e-01 3.22e-01 ph/cm2/s
Fluence Cutoff-PL 2.51e-08 5.69e-09 2.00e-11 3.19e-17 3.09e-08 3.08e-08 erg/cm2
Error 8.15e-09 2.80e-09 1.74e-10 2.86e-13 1.07e-08 1.06e-08 erg/cm2
Peak flux Cutoff-PL 6.83e-01 1.46e-01 1.53e-02 1.76e-03 8.44e-01 8.49e-01 ph/cm2/s
Error 2.47e-01 1.01e-01 2.59e-02 6.58e-03 3.21e-01 3.22e-01 ph/cm2/s
Fluence Band 2.56e-08 5.42e-09 4.42e-11 2.72e-13 3.14e-08 2.88e-08 erg/cm2
Error 8.19e-09 2.95e-09 4.61e-10 4.05e-10 1.05e-08 1.07e-08 erg/cm2
Peak flux Band 7.48e-01 1.40e-01 3.01e-03 1.78e-05 8.91e-01 9.06e-01 ph/cm2/s
Error 2.57e-01 9.63e-02 1.68e-02 2.58e-03 3.06e-01 3.29e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.255 1.236 - - 1.09e-03 1.48e-03 55.337 57
CPL -2.497 0.000 14.4 9.2 3.75e+02 1.87e+03 50.276 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.255 1.236 - - 1.09e-03 1.48e-03 55.337 57
CPL -2.497 0.000 14.4 9.2 3.75e+02 1.87e+03 50.276 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
58.8756 +37.5452 0.0588 50.7 -10.5 0.0773 3.3 TRIG_00347982
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.000 -8.000 (delta_t = 52.000 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.25536 ( -1.06601 1.40629 )
Norm@50keV : 1.090800E-03 ( -1.090800E-03 1.875796E-03) )
------------------------------------------------------------
Chi-Squared = 55.33740 using 59 PHA bins.
Reduced chi-squared = 0.9708316 for 57 degrees of freedom
Null hypothesis probability = 0.538
Photon flux (15-150 keV) in 1.024 sec: 0.843244 ( -0.305948 0.325886 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.98791e-08 ( -1.19484e-08 1.45907e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49742 ( )
Epeak [keV] : 14.4377 ( -15.0547 3.28719 )
Norm@50keV : 374.753 ( -625.599 3109.02 )
------------------------------------------------------------
Chi-Squared = 50.27566 using 59 PHA bins.
Reduced chi-squared = 0.8977796 for 56 degrees of freedom
Null hypothesis probability = 0.690
Photon flux (15-150 keV) in 1.024 sec: 0.844048 ( -0.317612 0.324502 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08871e-08 ( -1.04902e-08 1.0878e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.27488 ( -1.91132 3.12036 )
beta : -4.22165 ( -0.628329 5.01831 )
Epeak [keV] : 379.420 ( -6.93815 1.89387 )
Norm@50keV : 0.153101 ( -5324.86 50146.7 )
------------------------------------------------------------
Chi-Squared = 55.33822 using 59 PHA bins.
Reduced chi-squared = 1.006150 for 55 degrees of freedom
Null hypothesis probability = 0.462
Photon flux (15-150 keV) in 1.024 sec: 0.890741 ( -0.306177 0.306059 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.13586e-08 ( -1.03842e-08 1.07013e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.25536 ( -1.06601 1.40629 )
Norm@50keV : 1.090800E-03 ( -1.090800E-03 1.875796E-03) )
------------------------------------------------------------
Chi-Squared = 55.33740 using 59 PHA bins.
Reduced chi-squared = 0.9708316 for 57 degrees of freedom
Null hypothesis probability = 0.538
Photon flux (15-150 keV) in 1.024 sec: 0.843244 ( -0.305948 0.325886 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.98791e-08 ( -1.19484e-08 1.45907e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49742 ( )
Epeak [keV] : 14.4377 ( -15.0547 3.28719 )
Norm@50keV : 374.753 ( -625.599 3109.02 )
------------------------------------------------------------
Chi-Squared = 50.27566 using 59 PHA bins.
Reduced chi-squared = 0.8977796 for 56 degrees of freedom
Null hypothesis probability = 0.690
Photon flux (15-150 keV) in 1.024 sec: 0.844048 ( -0.317612 0.324502 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08871e-08 ( -1.04902e-08 1.0878e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.27488 ( -1.91132 3.12036 )
beta : -4.22165 ( -0.628329 5.01831 )
Epeak [keV] : 379.420 ( -6.93815 1.89387 )
Norm@50keV : 0.153101 ( -5324.86 50146.7 )
------------------------------------------------------------
Chi-Squared = 55.33822 using 59 PHA bins.
Reduced chi-squared = 1.006150 for 55 degrees of freedom
Null hypothesis probability = 0.462
Photon flux (15-150 keV) in 1.024 sec: 0.890741 ( -0.306177 0.306059 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.13586e-08 ( -1.03842e-08 1.07013e-08 ) ergs/cm2
Plot creation:
Mon Mar 30 20:37:47 EDT 2009