batgrbproduct Analysis for Trigger=361246
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 v2.45
Process Start Time (local time): Sun Aug 30 12:34:08 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger361246/GCN5_download_cron
======================================================================
Trigger: 00361246 Segment: 000
BAT Trigger Time: 273299513.088 [s; MET]
Trigger Stop: 273299517.184 [s; MET]
UTC: 2009-08-30T04:31:48.046740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.186797692224 Dec: 22.418327826048 [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: 7.21110255092798 [ if not an image trigger ]
Image S/N Ratio: 5.66
Flight Position: [ source = BAT ]
RA: 252.186797692224 Dec: 22.418327826048 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.214156958045 Dec: 22.4404198326475 [deg; J2000]
{ 16h 48m 51.4s , +22d 26' 25.5" }
+/- 4.86508812562641 [arcmin] (estimated 90% radius based on SNR)
+/- 3.49166763345665 [arcmin] (formal 1-sigma fit error)
SNR: 3.17365870396643
Angular difference between Flight and Ground position is 2.014802 arcmin
Partial Coding Fraction: 0.1289062 [ including projection effects ]
Duration
T90: 4.09600001573563 +/-
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
T50: 4.09600001573563 +/-
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 4.09600001573563 second)
Measured from: 2.98023223876953e-08
to: 4.09600004553795 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.140599 0.126541 -0.068552 0.015049
0.037056 0.039488 0.034778 0.032373 [error]
Peak 0.140599 0.126541 -0.068552 0.015049
0.037056 0.039488 0.034778 0.032373 [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 6.85e-08 4.25e-08 1.68e-08 8.97e-09 1.32e-07 1.39e-07 erg/cm2
Error 2.56e-08 2.23e-08 1.92e-08 1.91e-08 5.71e-08 6.49e-08 erg/cm2
Peak flux Power-law 5.63e-01 1.96e-01 3.88e-02 9.11e-03 8.02e-01 8.02e-01 ph/cm2/s
Error 2.12e-01 9.89e-02 4.34e-02 1.79e-02 2.87e-01 2.90e-01 ph/cm2/s
Fluence Cutoff-PL 6.37e-08 6.23e-08 9.78e-09 9.59e-11 1.36e-07 1.36e-07 erg/cm2
Error 2.93e-08 4.87e-08 1.61e-08 5.95e-09 5.02e-08 5.03e-08 erg/cm2
Peak flux Cutoff-PL 5.03e-01 2.89e-01 2.51e-02 1.34e-04 8.18e-01 8.18e-01 ph/cm2/s
Error 2.43e-01 1.50e-01 3.85e-02 5.67e-03 2.82e-01 2.82e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.335 0.958 - - 2.27e-03 2.13e-03 63.750 57
CPL -0.159 0.992 21.0 16.2 4.43e-01 2.87e+02 61.120 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.335 0.958 - - 2.27e-03 2.13e-03 63.750 57
CPL -0.159 0.965 21.0 16.2 4.43e-01 2.87e+02 61.120 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 4.096 0.000 4.096
T90 4.096 0.000 4.096
T50 4.096 0.000 4.096
Peak 4.096 0.000 4.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
252.2142 +22.4404 0.0607 55.0 -171.4 0.2489 3.2 TRIG_00361246
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-60.088 -17.088 (delta_t = 43.000 [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 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.33528 ( -0.748704 1.16709 )
Norm@50keV : 2.26532E-03 ( -0.00226519 0.00199623 )
------------------------------------------------------------
# Chi-Squared = 63.75 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 57 degrees of freedom
# Null hypothesis probability = 2.512992e-01
Photon flux (15-150 keV) in 4.096 sec: 0.802386 ( -0.285372 0.288701 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32385e-07 ( -5.38489e-08 6.0366e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.158992 ( 0.177423 2.16187 )
Epeak [keV] : 21.0326 ( -21.1564 11.2345 )
Norm@50keV : 0.442827 ( -0.477981 573.006 )
------------------------------------------------------------
# Chi-Squared = 61.12 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.973510e-01
Photon flux (15-150 keV) in 4.096 sec: 0.817667 ( -0.282225 0.282163 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35859e-07 ( -4.84315e-08 5.19131e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.459508 ( -4.98034 6.64156 )
beta : -9.37167 ( 9.99987 19.9999 )
Epeak [keV] : 22.4051 ( -22.0281 9.90651 )
Norm@50keV : 0.661580 ( -0.533221 170103 )
------------------------------------------------------------
# Chi-Squared = 61.12 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.655614e-01
Photon flux (15-150 keV) in 4.096 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.33528 ( -0.748704 1.16709 )
Norm@50keV : 2.26532E-03 ( -0.00226519 0.00199623 )
------------------------------------------------------------
# Chi-Squared = 63.75 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 57 degrees of freedom
# Null hypothesis probability = 2.512992e-01
Photon flux (15-150 keV) in 4.096 sec: 0.802386 ( -0.285372 0.288701 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32385e-07 ( -5.38489e-08 6.0366e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.158992 ( 0.177423 2.10834 )
Epeak [keV] : 21.0326 ( -21.1564 11.2345 )
Norm@50keV : 0.442827 ( -0.477981 573.006 )
------------------------------------------------------------
# Chi-Squared = 61.12 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.973510e-01
Photon flux (15-150 keV) in 4.096 sec: 0.817667 ( -0.282225 0.282163 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35859e-07 ( -4.84315e-08 5.19131e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.459508 ( -4.98034 6.64156 )
beta : -9.37167 ( 9.99987 19.9999 )
Epeak [keV] : 22.4051 ( -22.0281 9.90651 )
Norm@50keV : 0.661580 ( -0.533221 170103 )
------------------------------------------------------------
# Chi-Squared = 61.12 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.655614e-01
Photon flux (15-150 keV) in 4.096 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sun Aug 30 12:44:43 EDT 2009