batgrbproduct Analysis for Trigger=351012
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 v2.44
Process Start Time (local time): Sat May 2 03:07:33 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351012/GCN5_download_cron
======================================================================
Trigger: 00351012 Segment: 000
BAT Trigger Time: 262883341.952 [s; MET]
Trigger Stop: 262883350.144 [s; MET]
UTC: 2009-05-01T15:08:57.246980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 249.672665335558 Dec: 27.8257316001368 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.66
Image Trigger?: NO
Rate S/N Ratio: 7.93725393319377 [ if not an image trigger ]
Image S/N Ratio: 5.66
Flight Position: [ source = BAT ]
RA: 249.672665335558 Dec: 27.8257316001368 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 249.66731997731 Dec: 27.8716984661558 [deg; J2000]
{ 16h 38m 40.2s , +27d 52' 18.1" }
+/- 6.49211749998463 [arcmin] (estimated 90% radius based on SNR)
+/- 5.94824952971192 [arcmin] (formal 1-sigma fit error)
SNR: 2.10167917409026
Angular difference between Flight and Ground position is 2.772552 arcmin
Partial Coding Fraction: 0.5234375 [ including projection effects ]
Duration
T90: 8.19200000166893 +/-
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
T50: 8.19200000166893 +/-
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 8.19200000166893 second)
Measured from: -1.49011611938477e-08
to: 8.19199998676777 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.100146 -0.013780 0.002097 -0.017351
0.024811 0.022456 0.020210 0.019706 [error]
Peak 0.100146 -0.013780 0.002097 -0.017351
0.024811 0.022456 0.020210 0.019706 [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 2.50e-08 8.93e-09 1.81e-09 4.37e-10 3.61e-08 3.62e-08 erg/cm2
Error 1.34e-08 1.00e-08 4.85e-09 3.78e-09 2.39e-08 2.49e-08 erg/cm2
Peak flux Power-law 1.04e-01 2.07e-02 2.13e-03 2.34e-04 1.28e-01 1.27e-01 ph/cm2/s
Error 5.60e-02 2.15e-02 5.53e-03 1.83e-03 7.20e-02 7.22e-02 ph/cm2/s
Fluence Cutoff-PL 2.98e-08 7.98e-09 4.06e-11 1.37e-16 3.79e-08 3.79e-08 erg/cm2
Error 1.47e-08 7.13e-09 2.43e-09 3.10e-10 1.97e-08 1.51e-08 erg/cm2
Peak flux Cutoff-PL 1.05e-01 2.10e-02 2.16e-03 2.40e-04 1.28e-01 1.27e-01 ph/cm2/s
Error 5.61e-02 2.15e-02 5.52e-03 1.81e-03 7.20e-02 7.21e-02 ph/cm2/s
Fluence Band 1.64e-08 1.36e-08 2.57e-09 3.67e-10 3.54e-08 5.30e-08 erg/cm2
Error 2.18e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.05e-01 2.10e-02 2.16e-03 1.29e-05 1.32e-01 1.26e-01 ph/cm2/s
Error 8.03e-02 2.15e-02 5.52e-03 1.11e-03 5.35e-02 7.23e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.340 2.059 - - 1.53e-04 2.94e-04 51.042 57
CPL -2.453 0.000 15.2 10.9 3.72e+01 6.42e+02 49.088 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.340 2.059 - - 1.53e-04 2.94e-04 51.042 57
CPL -2.453 0.000 15.2 10.9 3.72e+01 6.42e+02 49.088 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 8.192 0.000 8.192
T90 8.192 0.000 8.192
T50 8.192 0.000 8.192
Peak 8.192 -0.000 8.192
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
249.6673 +27.8717 0.0917 42.4 -164.2 0.1073 2.1 TRIG_00351012
------------------------------------------
Foreground time interval of the image:
0.000 8.192 (delta_t = 8.192 [sec])
Background time interval of the image:
-60.952 -29.952 (delta_t = 31.000 [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 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.34013 ( -1.50059 2.61791 )
Norm@50keV : 1.529559E-04 ( -1.529559E-04 4.352831E-04) )
------------------------------------------------------------
Chi-Squared = 51.04175 using 59 PHA bins.
Reduced chi-squared = 0.8954692 for 57 degrees of freedom
Null hypothesis probability = 0.697
Photon flux (15-150 keV) in 8.192 sec: 0.128447 ( -0.0710718 0.072893 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.60583e-08 ( -2.14681e-08 2.64191e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.45339 ( )
Epeak [keV] : 15.1720 ( -15.6759 6.20731 )
Norm@50keV : 37.2439 ( -101.200 1182.28 )
------------------------------------------------------------
Chi-Squared = 49.08791 using 59 PHA bins.
Reduced chi-squared = 0.8765698 for 56 degrees of freedom
Null hypothesis probability = 0.732
Photon flux (15-150 keV) in 8.192 sec: 0.128135 ( -0.0708194 0.073094 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79036e-08 ( -1.91745e-08 2.01809e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.00431 ( -0.995688 14.0043 )
beta : -4.26294 ( -2.70013 1.42448 )
Epeak [keV] : 647.577 ( -647.477 9352.42 )
Norm@50keV : 2.239415E-02 ( -2.239415E-02 5.754952E-02) )
------------------------------------------------------------
Chi-Squared = 51.04124 using 59 PHA bins.
Reduced chi-squared = 0.9280226 for 55 degrees of freedom
Null hypothesis probability = 0.627
Photon flux (15-150 keV) in 8.192 sec: 0.131723 ( -0.0696721 0.037385 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54488e-08 ( -1.91768e-08 2.45114e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.34013 ( -1.50059 2.61791 )
Norm@50keV : 1.529559E-04 ( -1.529559E-04 4.352831E-04) )
------------------------------------------------------------
Chi-Squared = 51.04175 using 59 PHA bins.
Reduced chi-squared = 0.8954692 for 57 degrees of freedom
Null hypothesis probability = 0.697
Photon flux (15-150 keV) in 8.192 sec: 0.128447 ( -0.0710718 0.072893 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.60583e-08 ( -2.14681e-08 2.64191e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.45339 ( )
Epeak [keV] : 15.1720 ( -15.6759 6.20731 )
Norm@50keV : 37.2439 ( -101.200 1182.28 )
------------------------------------------------------------
Chi-Squared = 49.08791 using 59 PHA bins.
Reduced chi-squared = 0.8765698 for 56 degrees of freedom
Null hypothesis probability = 0.732
Photon flux (15-150 keV) in 8.192 sec: 0.128135 ( -0.0708194 0.073094 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79036e-08 ( -1.91745e-08 2.01809e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.00431 ( -0.995688 14.0043 )
beta : -4.26294 ( -2.70013 1.42448 )
Epeak [keV] : 647.577 ( -647.477 9352.42 )
Norm@50keV : 2.239415E-02 ( -2.239415E-02 5.754952E-02) )
------------------------------------------------------------
Chi-Squared = 51.04124 using 59 PHA bins.
Reduced chi-squared = 0.9280226 for 55 degrees of freedom
Null hypothesis probability = 0.627
Photon flux (15-150 keV) in 8.192 sec: 0.131723 ( -0.0696721 0.037385 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54488e-08 ( -1.91768e-08 2.45114e-08 ) ergs/cm2
Plot creation:
Sat May 2 03:28:38 EDT 2009