batgrbproduct Analysis for Trigger=344252
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 19:45:38 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger344252/GCN5_download_cron
======================================================================
Trigger: 00344252 Segment: 000
BAT Trigger Time: 257352371.52 [s; MET]
Trigger Stop: 257352372.032 [s; MET]
UTC: 2009-02-26T14:46:06.989200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 172.771365759222 Dec: 53.4210196314729 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.08
Image Trigger?: NO
Rate S/N Ratio: 4.89897948556636 [ if not an image trigger ]
Image S/N Ratio: 5.08
Flight Position: [ source = BAT ]
RA: 172.771365759222 Dec: 53.4210196314729 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 173.097976681621 Dec: 53.3895377475957 [deg; J2000]
{ 11h 32m 23.5s , +53d 23' 22.3" }
+/- 4.59504441967493 [arcmin] (estimated 90% radius based on SNR)
+/- 4.70915624331974 [arcmin] (formal 1-sigma fit error)
SNR: 3.44342174051664
Angular difference between Flight and Ground position is 11.834274 arcmin
Partial Coding Fraction: 0.6171875 [ 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: 0.512000009417534 [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 -0.003986 -0.004899 0.014204 0.008828
0.004664 0.004760 0.004322 0.003773 [error]
Peak -0.003986 -0.004899 0.014204 0.008828
0.004664 0.004760 0.004322 0.003773 [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 1.88e-10 1.11e-09 5.73e-09 1.32e-07 1.85e-08 2.66e-07 erg/cm2
Error 4.29e-10 1.45e-09 4.71e-09 1.75e-07 1.29e-08 0.00e+00 erg/cm2
Peak flux Power-law 1.11e-02 3.50e-02 9.18e-02 6.90e-01 2.49e-01 8.41e-01 ph/cm2/s
Error 2.65e-02 4.81e-02 7.68e-02 7.98e-01 2.09e-01 7.69e-01 ph/cm2/s
Fluence Cutoff-PL 9.46e-11 1.15e-09 7.78e-09 2.72e-08 1.98e-08 3.19e-08 erg/cm2
Error 4.85e-09 1.62e-07 9.68e-09 1.72e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.41e-03 3.18e-02 1.21e-01 2.20e-01 2.68e-01 3.78e-01 ph/cm2/s
Error 2.00e-02 4.54e-02 8.07e-02 7.96e-01 1.42e-01 6.86e-01 ph/cm2/s
Fluence Band 5.73e-11 9.93e-10 8.00e-09 2.15e-08 1.98e-08 3.75e-08 erg/cm2
Error 3.78e-09 1.33e-07 9.55e-09 1.76e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.04e-03 2.49e-02 1.26e-01 1.78e-01 2.62e-01 3.30e-01 ph/cm2/s
Error 1.32e-02 2.55e-02 8.39e-02 3.01e-01 1.46e-01 4.84e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.384 1.526 - - 1.58e-03 1.69e-03 64.335 57
CPL -0.405 1.814 9998.8 5000.0 1.60e-03 1.70e-03 64.318 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.384 1.526 - - 1.58e-03 1.69e-03 64.335 57
CPL -0.405 1.814 9998.8 5000.0 1.60e-03 1.70e-03 64.318 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 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
173.0980 +53.3895 0.0557 30.7 25.0 0.0289 3.4 TRIG_00344252
------------------------------------------
Foreground time interval of the image:
0.000 0.512 (delta_t = 0.512 [sec])
Background time interval of the image:
-60.520 -60.030 (delta_t = 0.490 [sec])
-58.520 -3.520 (delta_t = 55.000 [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 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.383564 ( -2.02818 1.02379 )
Norm@50keV : 1.577029E-03 ( -1.577029E-03 1.800914E-03) )
------------------------------------------------------------
Chi-Squared = 64.33538 using 59 PHA bins.
Reduced chi-squared = 1.128691 for 57 degrees of freedom
Null hypothesis probability = 0.235
Photon flux (15-150 keV) in 0.5120 sec: 0.249390 ( -0.24939 0.169296 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85353e-08 ( -1.61784e-08 9.71628e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.405320 ( -2.59468 1.03320 )
Epeak [keV] : 9998.84 ( -9998.83 1.15918 )
Norm@50keV : 1.597009E-03 ( -1.597009E-03 1.812745E-03) )
------------------------------------------------------------
Chi-Squared = 64.31833 using 59 PHA bins.
Reduced chi-squared = 1.148542 for 56 degrees of freedom
Null hypothesis probability = 0.208
Photon flux (15-150 keV) in 0.5120 sec: 0.267687 ( -0.138317 0.145853 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97792e-08 ( -9.64905e-09 9.71023e-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 : 4.38550 ( -14.9765 2.348518E-02) )
beta : -9.28935 ( )
Epeak [keV] : 126.365 ( )
Norm@50keV : 2.109768E-02 ( )
------------------------------------------------------------
Chi-Squared = 62.90557 using 59 PHA bins.
Reduced chi-squared = 1.143738 for 55 degrees of freedom
Null hypothesis probability = 0.217
Photon flux (15-150 keV) in 0.5120 sec: 0.261728 ( -0.131624 0.159952 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97505e-08 ( -9.52786e-09 9.58131e-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: -0.383564 ( -2.02818 1.02379 )
Norm@50keV : 1.577029E-03 ( -1.577029E-03 1.800914E-03) )
------------------------------------------------------------
Chi-Squared = 64.33538 using 59 PHA bins.
Reduced chi-squared = 1.128691 for 57 degrees of freedom
Null hypothesis probability = 0.235
Photon flux (15-150 keV) in 0.5120 sec: 0.249390 ( -0.24939 0.169296 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85353e-08 ( -1.61784e-08 9.71628e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.405320 ( -2.59468 1.03320 )
Epeak [keV] : 9998.84 ( -9998.83 1.15918 )
Norm@50keV : 1.597009E-03 ( -1.597009E-03 1.812745E-03) )
------------------------------------------------------------
Chi-Squared = 64.31833 using 59 PHA bins.
Reduced chi-squared = 1.148542 for 56 degrees of freedom
Null hypothesis probability = 0.208
Photon flux (15-150 keV) in 0.5120 sec: 0.267687 ( -0.138317 0.145853 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97792e-08 ( -9.64905e-09 9.71023e-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 : 4.38550 ( -14.9765 2.348518E-02) )
beta : -9.28935 ( )
Epeak [keV] : 126.365 ( )
Norm@50keV : 2.109768E-02 ( )
------------------------------------------------------------
Chi-Squared = 62.90557 using 59 PHA bins.
Reduced chi-squared = 1.143738 for 55 degrees of freedom
Null hypothesis probability = 0.217
Photon flux (15-150 keV) in 0.5120 sec: 0.261728 ( -0.131624 0.159952 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97505e-08 ( -9.52786e-09 9.58131e-09 ) ergs/cm2
Plot creation:
Thu Feb 26 20:15:10 EST 2009