batgrbproduct Analysis for Trigger=361788
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): Thu Sep 3 20:32:52 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger361788/GCN5_download_cron
======================================================================
Trigger: 00361788 Segment: 000
BAT Trigger Time: 273676423.424 [s; MET]
Trigger Stop: 273676423.936 [s; MET]
UTC: 2009-09-03T13:13:38.370400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 286.046618736523 Dec: 50.4213334656168 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.73
Image Trigger?: NO
Rate S/N Ratio: 5.56776436283002 [ if not an image trigger ]
Image S/N Ratio: 5.73
Flight Position: [ source = BAT ]
RA: 286.046618736523 Dec: 50.4213334656168 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 286.089550898794 Dec: 50.4055055987744 [deg; J2000]
{ 19h 04m 21.5s , +50d 24' 19.8" }
+/- 3.89875157394734 [arcmin] (estimated 90% radius based on SNR)
+/- 2.43020913557035 [arcmin] (formal 1-sigma fit error)
SNR: 4.35450711140844
Angular difference between Flight and Ground position is 1.896413 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.51199996471405 +/-
Measured from: 0
to: 0.51199996471405 [s; relative to TRIGTIME]
T50: 0.51199996471405 +/-
Measured from: 0
to: 0.51199996471405 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.51199996471405 second)
Measured from: 0
to: 0.51199996471405 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.51199996471405 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.000910 0.016180 0.011593 0.000799
0.003772 0.003947 0.003485 0.002907 [error]
Peak -0.000910 0.016180 0.011593 0.000799
0.003772 0.003947 0.003485 0.002907 [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 1.52e-09 3.95e-09 8.25e-09 4.41e-08 2.23e-08 5.76e-08 erg/cm2
Error 9.81e-10 1.66e-09 3.05e-09 3.49e-08 8.12e-09 3.66e-08 erg/cm2
Peak flux Power-law 9.46e-02 1.33e-01 1.39e-01 2.67e-01 4.51e-01 6.33e-01 ph/cm2/s
Error 6.19e-02 5.74e-02 5.05e-02 1.93e-01 1.62e-01 2.40e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 4.40e-02 1.64e-01 1.79e-01 3.20e-02 4.19e-01 0.00e+00 ph/cm2/s
Error 4.38e-02 7.36e-02 5.29e-02 1.51e-01 0.00e+00 0.00e+00 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 0.941 0.538 - - 3.93e-03 1.41e-03 62.850 57
CPL -2.668 0.109 69.3 42.2 1.82e-01 9.16e-01 57.810 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.941 0.538 - - 3.93e-03 1.41e-03 62.850 57
CPL -2.668 0.109 69.3 42.2 1.82e-01 9.16e-01 57.810 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
286.0896 +50.4055 0.0443 10.8 -163.5 0.0296 4.4 TRIG_00361788
------------------------------------------
Foreground time interval of the image:
0.000 0.512 (delta_t = 0.512 [sec])
Background time interval of the image:
-60.424 -7.424 (delta_t = 53.000 [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: 0.940970 ( -0.565195 0.511402 )
Norm@50keV : 3.93364E-03 ( -0.00141733 0.00140112 )
------------------------------------------------------------
# Chi-Squared = 62.85 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.768830e-01
Photon flux (15-150 keV) in 0.512 sec: 0.451180 ( -0.1591 0.163933 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22567e-08 ( -8.01147e-09 8.23537e-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: -2.66847 ( 2.81314 3.03094 )
Epeak [keV] : 69.3423 ( -17.2121 67.1552 )
Norm@50keV : 0.182354 ( -0.212313 1.62008 )
------------------------------------------------------------
# Chi-Squared = 57.81 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 56 degrees of freedom
# Null hypothesis probability = 4.081244e-01
Photon flux (15-150 keV) in 0.512 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 4.35858 ( -2.63476 -2.41745 )
beta : -2.25243 ( 10 20 )
Epeak [keV] : 55.8808 ( -16.8667 66.8737 )
Norm@50keV : 1.94171 ( -1.9315 0.899829 )
------------------------------------------------------------
# Chi-Squared = 57.53 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 55 degrees of freedom
# Null hypothesis probability = 3.817848e-01
Photon flux (15-150 keV) in 0.512 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 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.940970 ( -0.565195 0.511402 )
Norm@50keV : 3.93364E-03 ( -0.00141733 0.00140112 )
------------------------------------------------------------
# Chi-Squared = 62.85 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.768830e-01
Photon flux (15-150 keV) in 0.512 sec: 0.451180 ( -0.1591 0.163933 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22567e-08 ( -8.01147e-09 8.23537e-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: -2.66847 ( 2.81314 3.03094 )
Epeak [keV] : 69.3423 ( -17.2121 67.1552 )
Norm@50keV : 0.182354 ( -0.212313 1.62008 )
------------------------------------------------------------
# Chi-Squared = 57.81 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 56 degrees of freedom
# Null hypothesis probability = 4.081244e-01
Photon flux (15-150 keV) in 0.512 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 4.35858 ( -2.63476 -2.41745 )
beta : -2.25243 ( 10 20 )
Epeak [keV] : 55.8808 ( -16.8667 66.8737 )
Norm@50keV : 1.94171 ( -1.9315 0.899829 )
------------------------------------------------------------
# Chi-Squared = 57.53 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 55 degrees of freedom
# Null hypothesis probability = 3.817848e-01
Photon flux (15-150 keV) in 0.512 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Sep 3 20:43:25 EDT 2009