batgrbproduct Analysis for Trigger=348858
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): Fri Apr 10 17:54:25 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger348858/GCN5_download_cron
======================================================================
Trigger: 00348858 Segment: 000
BAT Trigger Time: 261040750.592 [s; MET]
Trigger Stop: 261040751.104 [s; MET]
UTC: 2009-04-10T07:19:05.945300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 305.868745032652 Dec: 38.3626337229478 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.63
Image Trigger?: NO
Rate S/N Ratio: 7.14142842854285 [ if not an image trigger ]
Image S/N Ratio: 5.63
Flight Position: [ source = BAT ]
RA: 305.868745032652 Dec: 38.3626337229478 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 305.888743403131 Dec: 38.4121946674093 [deg; J2000]
{ 20h 23m 33.3s , +38d 24' 43.9" }
+/- 3.33980314716991 [arcmin] (estimated 90% radius based on SNR)
+/- 1.91477038154907 [arcmin] (formal 1-sigma fit error)
SNR: 5.4318242432964
Angular difference between Flight and Ground position is 3.118848 arcmin
Partial Coding Fraction: 0.984375 [ 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 0.017007 0.016683 0.002129 0.001659
0.004176 0.004188 0.003747 0.003931 [error]
Peak 0.017007 0.016683 0.002129 0.001659
0.004176 0.004188 0.003747 0.003931 [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 4.27e-09 5.02e-09 4.24e-09 6.07e-09 1.57e-08 1.93e-08 erg/cm2
Error 1.62e-09 1.85e-09 2.70e-09 7.22e-09 6.72e-09 1.16e-08 erg/cm2
Peak flux Power-law 2.74e-01 1.78e-01 7.54e-02 4.36e-02 5.50e-01 5.70e-01 ph/cm2/s
Error 1.05e-01 6.41e-02 4.65e-02 5.01e-02 1.84e-01 1.98e-01 ph/cm2/s
Fluence Cutoff-PL 4.98e-09 7.12e-09 9.64e-10 2.59e-12 1.31e-08 1.31e-08 erg/cm2
Error 1.75e-09 2.56e-09 1.27e-09 3.42e-11 4.01e-09 3.99e-09 erg/cm2
Peak flux Cutoff-PL 3.12e-01 2.59e-01 1.93e-02 2.60e-05 5.90e-01 5.90e-01 ph/cm2/s
Error 1.11e-01 8.85e-02 2.54e-02 3.75e-04 1.68e-01 1.68e-01 ph/cm2/s
Fluence Band 4.83e-09 7.13e-09 1.06e-09 1.03e-11 1.31e-08 1.49e-08 erg/cm2
Error 1.53e-09 2.31e-09 8.11e-10 1.29e-11 4.67e-09 0.00e+00 erg/cm2
Peak flux Band 2.90e-01 2.26e-01 5.14e-02 4.42e-03 5.72e-01 5.71e-01 ph/cm2/s
Error 1.06e-01 7.45e-02 3.37e-02 3.42e-02 1.75e-01 1.74e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.277 0.604 - - 3.07e-03 1.58e-03 65.707 57
CPL -2.490 0.000 28.0 5.2 7.45e+00 2.12e+01 56.666 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.277 0.604 - - 3.07e-03 1.58e-03 65.707 57
CPL -2.490 0.000 28.0 5.2 7.45e+00 2.12e+01 56.666 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
305.8887 +38.4122 0.0354 18.6 -153.3 0.0425 5.4 TRIG_00348858
------------------------------------------
Foreground time interval of the image:
0.000 0.512 (delta_t = 0.512 [sec])
Background time interval of the image:
-60.592 -6.592 (delta_t = 54.000 [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: 2.27668 ( -0.590569 0.618111 )
Norm@50keV : 3.069172E-03 ( -1.366618E-03 1.799977E-03) )
------------------------------------------------------------
Chi-Squared = 65.70670 using 59 PHA bins.
Reduced chi-squared = 1.152749 for 57 degrees of freedom
Null hypothesis probability = 0.201
Photon flux (15-150 keV) in 0.5120 sec: 0.549522 ( -0.182805 0.185359 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57179e-08 ( -6.2825e-09 7.15459e-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: -2.49029 ( )
Epeak [keV] : 28.0477 ( -4.56675 5.77260 )
Norm@50keV : 7.44754 ( -17.4031 25.0518 )
------------------------------------------------------------
Chi-Squared = 56.66559 using 59 PHA bins.
Reduced chi-squared = 1.011886 for 56 degrees of freedom
Null hypothesis probability = 0.450
Photon flux (15-150 keV) in 0.5120 sec: 0.590219 ( -0.167666 0.167665 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30727e-08 ( -3.9296e-09 4.0853e-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 : -1.26105 ( -2.92968 1.132917E-02) )
beta : -3.45978 ( -0.628659 6.28741 )
Epeak [keV] : 23.4941 ( -4.64853 3.88858 )
Norm@50keV : 1.612510E-02 ( -320.061 884.906 )
------------------------------------------------------------
Chi-Squared = 62.98037 using 59 PHA bins.
Reduced chi-squared = 1.145098 for 55 degrees of freedom
Null hypothesis probability = 0.215
Photon flux (15-150 keV) in 0.5120 sec: 0.572142 ( -0.174826 0.176092 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31485e-08 ( -3.7462e-09 5.58986e-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: 2.27668 ( -0.590569 0.618111 )
Norm@50keV : 3.069172E-03 ( -1.366618E-03 1.799977E-03) )
------------------------------------------------------------
Chi-Squared = 65.70670 using 59 PHA bins.
Reduced chi-squared = 1.152749 for 57 degrees of freedom
Null hypothesis probability = 0.201
Photon flux (15-150 keV) in 0.5120 sec: 0.549522 ( -0.182805 0.185359 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57179e-08 ( -6.2825e-09 7.15459e-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: -2.49029 ( )
Epeak [keV] : 28.0477 ( -4.56675 5.77260 )
Norm@50keV : 7.44754 ( -17.4031 25.0518 )
------------------------------------------------------------
Chi-Squared = 56.66559 using 59 PHA bins.
Reduced chi-squared = 1.011886 for 56 degrees of freedom
Null hypothesis probability = 0.450
Photon flux (15-150 keV) in 0.5120 sec: 0.590219 ( -0.167666 0.167665 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30727e-08 ( -3.9296e-09 4.0853e-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 : -1.26105 ( -2.92968 1.132917E-02) )
beta : -3.45978 ( -0.628659 6.28741 )
Epeak [keV] : 23.4941 ( -4.64809 3.88858 )
Norm@50keV : 1.612510E-02 ( -320.061 884.906 )
------------------------------------------------------------
Chi-Squared = 62.98037 using 59 PHA bins.
Reduced chi-squared = 1.145098 for 55 degrees of freedom
Null hypothesis probability = 0.215
Photon flux (15-150 keV) in 0.5120 sec: 0.572142 ( -0.174826 0.176092 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31485e-08 ( -3.7462e-09 5.58986e-09 ) ergs/cm2
Plot creation:
Fri Apr 10 18:07:41 EDT 2009