batgrbproduct Analysis for Trigger=344343
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): Thu Feb 26 21:16:08 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger344343/GCN5_download_cron
======================================================================
Trigger: 00344343 Segment: 000
BAT Trigger Time: 257380442.176 [s; MET]
Trigger Stop: 257380444.224 [s; MET]
UTC: 2009-02-26T22:33:57.644320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 295.548979385147 Dec: 7.3522536347317 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.77
Image Trigger?: NO
Rate S/N Ratio: 6.40312423743285 [ if not an image trigger ]
Image S/N Ratio: 5.77
Flight Position: [ source = BAT ]
RA: 295.548979385147 Dec: 7.3522536347317 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 295.564074843315 Dec: 7.33278130825463 [deg; J2000]
{ 19h 42m 15.4s , +07d 19' 58.0" }
+/- 3.91791782343766 [arcmin] (estimated 90% radius based on SNR)
+/- 2.39222926603714 [arcmin] (formal 1-sigma fit error)
SNR: 4.32410758243054
Angular difference between Flight and Ground position is 1.473757 arcmin
Partial Coding Fraction: 0.2539062 [ including projection effects ]
Duration
T90: 2.04800000786781 +/-
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
T50: 2.04800000786781 +/-
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2.04800000786781 second)
Measured from: -1.49011611938477e-08
to: 2.04799999296665 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.034608 0.068880 0.017537 0.007304
0.016622 0.017016 0.013897 0.012416 [error]
Peak 0.034608 0.068880 0.017537 0.007304
0.016622 0.017016 0.013897 0.012416 [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 1.66e-08 2.06e-08 1.89e-08 2.99e-08 6.61e-08 8.64e-08 erg/cm2
Error 8.18e-09 8.38e-09 1.15e-08 3.90e-08 2.23e-08 5.15e-08 erg/cm2
Peak flux Power-law 2.62e-01 1.82e-01 8.32e-02 5.29e-02 5.54e-01 5.81e-01 ph/cm2/s
Error 1.33e-01 7.36e-02 4.94e-02 5.77e-02 2.23e-01 2.34e-01 ph/cm2/s
Fluence Cutoff-PL 1.32e-08 3.35e-08 1.18e-08 1.99e-10 5.90e-08 5.84e-08 erg/cm2
Error 7.06e-09 1.18e-08 1.12e-08 3.09e-09 2.23e-08 2.24e-08 erg/cm2
Peak flux Cutoff-PL 1.98e-01 2.93e-01 6.09e-02 5.97e-04 5.54e-01 5.54e-01 ph/cm2/s
Error 1.16e-01 1.02e-01 6.36e-02 7.49e-03 1.99e-01 1.99e-01 ph/cm2/s
Fluence Band 1.52e-08 2.89e-08 1.70e-08 2.15e-09 6.31e-08 6.19e-08 erg/cm2
Error 6.79e-09 1.04e-08 6.76e-09 1.60e-09 2.49e-08 2.60e-08 erg/cm2
Peak flux Band 2.64e-01 2.54e-01 7.57e-02 4.48e-03 5.79e-01 5.78e-01 ph/cm2/s
Error 9.78e-02 9.13e-02 4.52e-02 2.69e-02 2.08e-01 2.44e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.130 0.642 - - 3.47e-03 1.67e-03 72.095 57
CPL -1.363 0.000 36.7 9.6 4.38e-01 6.79e+00 66.995 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.130 0.642 - - 3.47e-03 1.67e-03 72.095 57
CPL -1.363 0.000 36.7 9.6 4.38e-01 6.79e+00 66.995 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 2.048 0.000 2.048
T90 2.048 0.000 2.048
T50 2.048 0.000 2.048
Peak 2.048 -0.000 2.048
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
295.5641 +7.3328 0.0445 45.1 -37.9 0.1381 4.3 TRIG_00344343
------------------------------------------
Foreground time interval of the image:
0.000 2.048 (delta_t = 2.048 [sec])
Background time interval of the image:
-60.176 -10.496 (delta_t = 49.680 [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 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12954 ( -0.585687 0.698566 )
Norm@50keV : 3.473830E-03 ( -1.686424E-03 1.659226E-03) )
------------------------------------------------------------
Chi-Squared = 72.09474 using 59 PHA bins.
Reduced chi-squared = 1.264820 for 57 degrees of freedom
Null hypothesis probability = 8.589E-02
Photon flux (15-150 keV) in 2.048 sec: 0.553830 ( -0.222772 0.223485 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.61406e-08 ( -1.41224e-08 3.05678e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.36280 ( )
Epeak [keV] : 36.6837 ( -8.69870 10.4945 )
Norm@50keV : 0.438138 ( -3.84574 9.73661 )
------------------------------------------------------------
Chi-Squared = 66.99472 using 59 PHA bins.
Reduced chi-squared = 1.196334 for 56 degrees of freedom
Null hypothesis probability = 0.149
Photon flux (15-150 keV) in 2.048 sec: 0.553515 ( -0.193801 0.203866 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.8991e-08 ( -2.12918e-08 2.32995e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17724 ( -4.73506 1.49050 )
beta : -4.38039 ( -7.375717E-03 19.9683 )
Epeak [keV] : 32.1828 ( -8.13927 12.6291 )
Norm@50keV : 1.449434E-02 ( -8.26981 35.1986 )
------------------------------------------------------------
Chi-Squared = 69.71792 using 59 PHA bins.
Reduced chi-squared = 1.267599 for 55 degrees of freedom
Null hypothesis probability = 8.740E-02
Photon flux (15-150 keV) in 2.048 sec: 0.579072 ( -0.208987 0.207968 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.30899e-08 ( -2.2914e-08 2.68823e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12954 ( -0.585687 0.698566 )
Norm@50keV : 3.473830E-03 ( -1.686424E-03 1.659226E-03) )
------------------------------------------------------------
Chi-Squared = 72.09474 using 59 PHA bins.
Reduced chi-squared = 1.264820 for 57 degrees of freedom
Null hypothesis probability = 8.589E-02
Photon flux (15-150 keV) in 2.048 sec: 0.553830 ( -0.222772 0.223485 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.61406e-08 ( -1.41224e-08 3.05678e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.36280 ( )
Epeak [keV] : 36.6837 ( -8.69870 10.4945 )
Norm@50keV : 0.438138 ( -3.84574 9.73661 )
------------------------------------------------------------
Chi-Squared = 66.99472 using 59 PHA bins.
Reduced chi-squared = 1.196334 for 56 degrees of freedom
Null hypothesis probability = 0.149
Photon flux (15-150 keV) in 2.048 sec: 0.553515 ( -0.193801 0.203866 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.8991e-08 ( -2.12918e-08 2.32995e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17724 ( -4.73516 1.49050 )
beta : -4.38039 ( -7.375717E-03 19.9684 )
Epeak [keV] : 32.1828 ( -7.86379 12.6291 )
Norm@50keV : 1.449434E-02 ( -8.26981 35.1986 )
------------------------------------------------------------
Chi-Squared = 69.71792 using 59 PHA bins.
Reduced chi-squared = 1.267599 for 55 degrees of freedom
Null hypothesis probability = 8.740E-02
Photon flux (15-150 keV) in 2.048 sec: 0.579072 ( -0.208987 0.207968 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.30899e-08 ( -2.2914e-08 2.68823e-08 ) ergs/cm2
Plot creation:
Thu Feb 26 21:23:10 EST 2009