batgrbproduct Analysis for Trigger=361477
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): Tue Sep 1 10:15:02 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger361477/GCN5_download_cron
======================================================================
Trigger: 00361477 Segment: 000
BAT Trigger Time: 273434480 [s; MET]
Trigger Stop: 273434544 [s; MET]
UTC: 2009-08-31T18:01:14.954320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 3.61933233536793 Dec: 27.9699939670182 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.3
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.3
Flight Position: [ source = BAT ]
RA: 3.61933233536793 Dec: 27.9699939670182 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 3.7004967008081 Dec: 27.9339719013388 [deg; J2000]
{ 00h 14m 48.1s , +27d 56' 02.3" }
+/- 5.17730139096234 [arcmin] (estimated 90% radius based on SNR)
+/- 3.00530780505395 [arcmin] (formal 1-sigma fit error)
SNR: 2.90382605408681
Angular difference between Flight and Ground position is 4.814182 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.141075 0.162539 0.023348 -0.080443
0.041042 0.042661 0.037292 0.031831 [error]
Peak 0.141075 0.162539 0.023348 -0.080443
0.041042 0.042661 0.037292 0.031831 [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 3.79e-08 4.82e-08 4.48e-08 7.32e-08 1.56e-07 2.02e-07 erg/cm2
Error 1.61e-08 1.84e-08 2.65e-08 9.02e-08 6.86e-08 1.20e-07 erg/cm2
Peak flux Power-law 1.93e-02 1.36e-02 6.34e-03 4.12e-03 4.13e-02 4.35e-02 ph/cm2/s
Error 8.32e-03 5.11e-03 3.65e-03 4.79e-03 1.54e-02 1.65e-02 ph/cm2/s
Fluence Cutoff-PL 3.32e-08 8.00e-08 2.98e-08 6.28e-10 1.44e-07 1.44e-07 erg/cm2
Error 1.71e-08 2.70e-08 3.44e-08 7.55e-09 5.35e-08 5.37e-08 erg/cm2
Peak flux Cutoff-PL 1.63e-02 2.24e-02 4.74e-03 5.55e-05 4.35e-02 4.35e-02 ph/cm2/s
Error 8.67e-03 7.49e-03 5.12e-03 5.94e-04 1.41e-02 1.41e-02 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 2.103 0.555 - - 2.62e-04 1.23e-04 85.450 57
CPL -1.976 0.331 36.3 10.6 9.11e-02 3.24e+00 77.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.103 0.555 - - 2.62e-04 1.23e-04 85.450 57
CPL -1.976 0.331 36.3 10.6 9.11e-02 3.24e+00 77.260 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
3.7005 +27.9340 0.0658 22.1 -26.6 0.2401 2.9 TRIG_00361477
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10340 ( -0.503901 0.60549 )
Norm@50keV : 2.62152E-04 ( -0.000120902 0.000124645 )
------------------------------------------------------------
# Chi-Squared = 85.45 using 59 PHA bins.
# Reduced chi-squared = 1.499 for 57 degrees of freedom
# Null hypothesis probability = 8.699021e-03
Photon flux (15-150 keV) in 64 sec: 4.13065E-02 ( -0.0154041 0.0153933 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55779e-07 ( -6.53158e-08 7.18502e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.97557 ( 2.01116 2.67282 )
Epeak [keV] : 36.3435 ( -8.97092 12.1714 )
Norm@50keV : 9.11345E-02 ( -0.104091 6.38093 )
------------------------------------------------------------
# Chi-Squared = 77.26 using 59 PHA bins.
# Reduced chi-squared = 1.380 for 56 degrees of freedom
# Null hypothesis probability = 3.136974e-02
Photon flux (15-150 keV) in 64 sec: 4.35003E-02 ( -0.0138526 0.0143428 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43735e-07 ( -4.9264e-08 5.77267e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.97712 ( -2.20427 -1.51848 )
beta : -9.99986 ( 23337.6 23347.6 )
Epeak [keV] : 36.0712 ( -8.76242 12.407 )
Norm@50keV : 9.40552E-02 ( -0.0973693 3.52546 )
------------------------------------------------------------
# Chi-Squared = 77.27 using 59 PHA bins.
# Reduced chi-squared = 1.405 for 55 degrees of freedom
# Null hypothesis probability = 2.550218e-02
Photon flux (15-150 keV) in 64 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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10340 ( -0.503901 0.60549 )
Norm@50keV : 2.62152E-04 ( -0.000120902 0.000124645 )
------------------------------------------------------------
# Chi-Squared = 85.45 using 59 PHA bins.
# Reduced chi-squared = 1.499 for 57 degrees of freedom
# Null hypothesis probability = 8.699021e-03
Photon flux (15-150 keV) in 64 sec: 4.13065E-02 ( -0.0154041 0.0153933 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55779e-07 ( -6.53158e-08 7.18502e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.97557 ( 2.01116 2.67282 )
Epeak [keV] : 36.3435 ( -8.97092 12.1714 )
Norm@50keV : 9.11345E-02 ( -0.104091 6.38289 )
------------------------------------------------------------
# Chi-Squared = 77.26 using 59 PHA bins.
# Reduced chi-squared = 1.380 for 56 degrees of freedom
# Null hypothesis probability = 3.136974e-02
Photon flux (15-150 keV) in 64 sec: 4.35003E-02 ( -0.0138526 0.0143428 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43735e-07 ( -4.9264e-08 5.77267e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.97712 ( -2.20427 -1.51848 )
beta : -9.99986 ( 23337.6 23347.6 )
Epeak [keV] : 36.0712 ( -8.76242 12.407 )
Norm@50keV : 9.40552E-02 ( -0.0973693 3.5232 )
------------------------------------------------------------
# Chi-Squared = 77.27 using 59 PHA bins.
# Reduced chi-squared = 1.405 for 55 degrees of freedom
# Null hypothesis probability = 2.550218e-02
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Sep 1 10:20:54 EDT 2009