batgrbproduct Analysis for Trigger=346069
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): Wed Mar 11 06:24:02 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger346069/GCN5_download_cron
======================================================================
Trigger: 00346069 Segment: 000
BAT Trigger Time: 258403200 [s; MET]
Trigger Stop: 258403520 [s; MET]
UTC: 2009-03-10T18:39:55.436160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.799624045701 Dec: -30.3173933954579 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.81
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.81
Flight Position: [ source = BAT ]
RA: 264.799624045701 Dec: -30.3173933954579 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.8074219324 Dec: -30.2611462308457 [deg; J2000]
{ 17h 39m 13.8s , -30d 15' 40.1" }
+/- 5.62433244787275 [arcmin] (estimated 90% radius based on SNR)
+/- 3.82607168290027 [arcmin] (formal 1-sigma fit error)
SNR: 2.57981405012105
Angular difference between Flight and Ground position is 3.398926 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.544686 0.393435 -0.181669 0.092155
0.111912 0.104248 0.090490 0.081482 [error]
Peak 0.544686 0.393435 -0.181669 0.092155
0.111912 0.104248 0.090490 0.081482 [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 1.64e-07 1.21e-07 5.97e-08 4.20e-08 3.64e-07 3.87e-07 erg/cm2
Error 4.95e-08 5.12e-08 5.03e-08 7.26e-08 1.40e-07 1.75e-07 erg/cm2
Peak flux Power-law 1.70e-02 7.10e-03 1.75e-03 5.27e-04 2.62e-02 2.64e-02 ph/cm2/s
Error 5.24e-03 2.88e-03 1.72e-03 8.49e-04 7.70e-03 7.84e-03 ph/cm2/s
Fluence Cutoff-PL 1.64e-07 1.21e-07 5.97e-08 4.17e-08 3.64e-07 3.87e-07 erg/cm2
Error 4.95e-08 5.13e-08 5.03e-08 7.20e-08 1.40e-07 1.75e-07 erg/cm2
Peak flux Cutoff-PL 1.70e-02 7.10e-03 1.75e-03 5.23e-04 2.62e-02 2.64e-02 ph/cm2/s
Error 5.23e-03 2.88e-03 1.72e-03 8.43e-04 7.70e-03 7.84e-03 ph/cm2/s
Fluence Band 1.66e-07 1.75e-07 3.30e-08 3.54e-10 3.41e-07 3.80e-07 erg/cm2
Error 7.07e-08 7.33e-09 9.64e-08 1.58e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.67e-02 8.76e-03 1.24e-03 4.39e-05 2.67e-02 2.63e-02 ph/cm2/s
Error 4.61e-03 3.05e-03 1.00e-03 4.15e-04 7.43e-03 7.79e-03 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.023 0.750 - - 9.36e-05 7.94e-05 71.469 57
CPL 1.528 0.000 9.5 27.3 1.07e-03 0.00e+00 69.426 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.023 0.750 - - 9.36e-05 7.94e-05 71.469 57
CPL 1.528 0.000 9.5 27.3 1.07e-03 0.00e+00 69.426 0
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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.8074 -30.2611 0.0744 18.5 77.0 1.1910 2.6 TRIG_00346069
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [sec])
Background time interval of the image:
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 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.02329 ( -0.636099 0.863593 )
Norm@50keV : 9.363312E-05 ( -9.363312E-05 6.510281E-05) )
------------------------------------------------------------
Chi-Squared = 71.46906 using 59 PHA bins.
Reduced chi-squared = 1.253843 for 57 degrees of freedom
Null hypothesis probability = 9.405E-02
Photon flux (15-150 keV) in 320.0 sec: 2.619794E-02 ( -0.00767039 0.00773304 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6439e-07 ( -1.30465e-07 1.49878e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52804 ( )
Epeak [keV] : 9.47808 ( -24.9824 29.6748 )
Norm@50keV : 1.070323E-03 ( )
------------------------------------------------------------
Chi-Squared = 69.42552 using 59 PHA bins.
but latest trial 57.1801 gives Chi-Squared = 9.98373
Reduced chi-squared = 1.239741 for 56 degrees of freedom
Null hypothesis probability = 0.107
Photon flux (15-150 keV) in 320.0 sec: 2.619008E-02 ( -0.00766984 0.00773036 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64474e-07 ( -1.30523e-07 1.4984e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36471 ( -8.63529 1.58518 )
beta : -4.66096 ( -4.32446 2.95587 )
Epeak [keV] : 24.6070 ( -13.3237 7.32223 )
Norm@50keV : 5.872567E-04 ( -4.245656E-02 27.3895 )
------------------------------------------------------------
Chi-Squared = 73.81059 using 59 PHA bins.
Reduced chi-squared = 1.342011 for 55 degrees of freedom
Null hypothesis probability = 4.608E-02
Photon flux (15-150 keV) in 320.0 sec: 2.671604E-02 ( -0.00750126 0.0073577 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.41354e-07 ( -9.94179e-08 9.33504e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.02329 ( -0.636099 0.863593 )
Norm@50keV : 9.363312E-05 ( -9.363312E-05 6.510281E-05) )
------------------------------------------------------------
Chi-Squared = 71.46906 using 59 PHA bins.
Reduced chi-squared = 1.253843 for 57 degrees of freedom
Null hypothesis probability = 9.405E-02
Photon flux (15-150 keV) in 320.0 sec: 2.619794E-02 ( -0.00767039 0.00773304 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6439e-07 ( -1.30465e-07 1.49878e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52804 ( )
Epeak [keV] : 9.47808 ( -24.9824 29.6748 )
Norm@50keV : 1.070323E-03 ( )
------------------------------------------------------------
Chi-Squared = 69.42552 using 59 PHA bins.
but latest trial 57.1801 gives Chi-Squared = 9.98373
Reduced chi-squared = 1.239741 for 56 degrees of freedom
Null hypothesis probability = 0.107
Photon flux (15-150 keV) in 320.0 sec: 2.619008E-02 ( -0.00766984 0.00773036 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64474e-07 ( -1.30523e-07 1.4984e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36471 ( -8.63529 1.58518 )
beta : -4.66096 ( -3.03198 16.9521 )
Epeak [keV] : 24.6070 ( -13.3591 7.29587 )
Norm@50keV : 5.872567E-04 ( -2.493208E-02 10.4528 )
------------------------------------------------------------
Chi-Squared = 73.81059 using 59 PHA bins.
Reduced chi-squared = 1.342011 for 55 degrees of freedom
Null hypothesis probability = 4.608E-02
Photon flux (15-150 keV) in 320.0 sec: 2.671604E-02 ( -0.00750126 0.0073577 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.41354e-07 ( -9.94179e-08 9.33504e-08 ) ergs/cm2
Plot creation:
Wed Mar 11 06:40:09 EDT 2009