batgrbproduct Analysis for Trigger=209351
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 v2.41
Process Start Time (local time): Tue Sep 2 08:18:34 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger209351/SDC
======================================================================
Trigger: 00209351 Segment: 000
BAT Trigger Time: 168939808.832 [s; MET]
Trigger Stop: 168939809.856 [s; MET]
UTC: 2006-05-10T07:43:27.647800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 95.8704790734399 Dec: -1.16215654342009 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.16
Image Trigger?: NO
Rate S/N Ratio: 63.8435587980495 [ if not an image trigger ]
Image S/N Ratio: 9.16
Flight Position: [ source = BAT ]
RA: 95.8704790734399 Dec: -1.16215654342009 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 95.8626796026018 Dec: -1.1611206324408 [deg; J2000]
{ 06h 23m 27.0s , -01d 09' 40.0" }
+/- 1.38386110830459 [arcmin] (estimated 90% radius based on SNR)
+/- 0.358050742388293 [arcmin] (formal 1-sigma fit error)
SNR: 19.1230719787535
Angular difference between Flight and Ground position is 0.471982 arcmin
Partial Coding Fraction: 0.06738281 [ including projection effects ]
Duration
T90: 20.3680000007153 +/- 1.13971924174702
Measured from: -5.63999998569489
to: 14.7280000150204 [s; relative to TRIGTIME]
T50: 5.86800000071526 +/- 0.534655027752565
Measured from: -1.03599998354912
to: 4.83200001716614 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.292000025510788
to: 1.29200002551079 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.97599998116493
to: 16.7480000257492 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.348979 4.249718 3.536499 0.805960
0.123453 0.133937 0.126485 0.102731 [error]
Peak 0.424376 0.567734 0.541375 0.145806
0.035594 0.039895 0.039597 0.027426 [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 1.18e-06 2.06e-06 2.74e-06 7.48e-06 7.99e-06 1.39e-05 erg/cm2
Error 8.12e-08 8.26e-08 1.29e-07 7.83e-07 3.10e-07 0.00e+00 erg/cm2
Peak flux Power-law 4.72e+00 4.84e+00 3.50e+00 4.06e+00 1.46e+01 1.71e+01 ph/cm2/s
Error 6.17e-01 3.87e-01 3.19e-01 7.63e-01 1.10e+00 1.26e+00 ph/cm2/s
Fluence Cutoff-PL 1.12e-06 2.09e-06 2.80e-06 5.64e-06 7.89e-06 1.00e-05 erg/cm2
Error 1.05e-07 9.15e-08 1.45e-07 1.95e-06 3.37e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.56e+00 4.90e+00 3.57e+00 3.45e+00 1.45e+01 1.65e+01 ph/cm2/s
Error 7.56e-01 4.25e-01 3.76e-01 1.31e+00 1.12e+00 1.81e+00 ph/cm2/s
Fluence Band 1.11e-06 2.08e-06 2.79e-06 5.67e-06 7.89e-06 1.01e-05 erg/cm2
Error 1.04e-07 9.14e-08 1.45e-07 1.95e-06 3.37e-07 0.00e+00 erg/cm2
Peak flux Band 4.55e+00 4.90e+00 3.57e+00 3.45e+00 1.45e+01 1.65e+01 ph/cm2/s
Error 7.56e-01 4.25e-01 3.76e-01 1.31e+00 1.13e+00 1.81e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.585 0.068 - - 3.60e-02 1.32e-03 55.231 57
CPL 1.375 0.268 161.4 4953.2 4.51e-02 1.28e-02 53.461 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.467 0.128 - - 1.18e-01 8.73e-03 63.023 57
CPL 1.300 0.389 226.4 5000.0 1.42e-01 6.36e-02 62.681 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: 19.328000 sec.
T50 in the 50-300 keV band: 5.248000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 23.724 -6.976 16.748
T90 20.368 -5.640 14.728
T50 5.868 -1.036 4.832
Peak 1.000 0.292 1.292
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
95.8627 -1.1611 0.0100 44.2 -69.3 12.7857 19.1 TRIG_00209351
------------------------------------------
Foreground time interval of the image:
-6.976 16.748 (delta_t = 23.724 [sec])
Background time interval of the image:
-107.027 -6.976 (delta_t = 100.051 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -6.976 sec. to 16.748 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58535 ( -6.754065E-02 6.809556E-02) )
Norm@50keV : 3.596339E-02 ( -1.318909E-03 1.317024E-03) )
------------------------------------------------------------
Chi-Squared = 55.23106 using 59 PHA bins.
Reduced chi-squared = 0.9689660 for 57 degrees of freedom
Null hypothesis probability = 0.542
Photon flux (15-150 keV) in 23.72 sec: 4.60079 ( -0.18106 0.18162 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.99286e-06 ( -3.10376e-07 3.10092e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.976 sec. to 16.748 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37491 ( -0.286136 0.249149 )
Epeak [keV] : 161.421 ( -67.8269 9838.58 )
Norm@50keV : 4.507188E-02 ( -9.812407E-03 1.575041E-02) )
------------------------------------------------------------
Chi-Squared = 53.46093 using 59 PHA bins.
but latest trial 77.4982 gives Chi-Squared = 11.7727
Reduced chi-squared = 0.9546594 for 56 degrees of freedom
Null hypothesis probability = 0.572
Photon flux (15-150 keV) in 23.72 sec: 4.53385 ( -0.19786 0.19903 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.89404e-06 ( -3.37227e-07 3.36207e-07 ) ergs/cm2
Band function
Time interval is from -6.976 sec. to 16.748 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36237 ( -8.63763 0.473107 )
beta : -1.79648 ( -7.52361 0.930673 )
Epeak [keV] : 151.143 ( -160.846 9839.05 )
Norm@50keV : 4.573876E-02 ( -9.847280E-03 1.571465E-02) )
------------------------------------------------------------
Chi-Squared = 53.52097 using 59 PHA bins.
Reduced chi-squared = 0.9731085 for 55 degrees of freedom
Null hypothesis probability = 0.531
Photon flux (15-150 keV) in 23.72 sec: 29.4695 ( -9.8119 439.918 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.88792e-06 ( -3.37891e-07 3.35567e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.292 sec. to 1.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46738 ( -0.126678 0.128524 )
Norm@50keV : 0.118303 ( -8.743428E-03 8.721262E-03) )
------------------------------------------------------------
Chi-Squared = 63.02316 using 59 PHA bins.
Reduced chi-squared = 1.105669 for 57 degrees of freedom
Null hypothesis probability = 0.272
Photon flux (15-150 keV) in 1.000 sec: 14.6431 ( -1.0993 1.1015 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12852e-06 ( -9.1012e-08 9.1566e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.292 sec. to 1.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30001 ( -0.492198 0.285462 )
Epeak [keV] : 226.408 ( -226.398 9773.59 )
Norm@50keV : 0.142153 ( -3.169754E-02 9.549937E-02) )
------------------------------------------------------------
Chi-Squared = 62.68074 using 59 PHA bins.
Reduced chi-squared = 1.119299 for 56 degrees of freedom
Null hypothesis probability = 0.251
Photon flux (15-150 keV) in 1.000 sec: 14.5414 ( -1.1081 1.1283 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12219e-06 ( -9.4137e-08 9.3649e-08 ) ergs/cm2
Band function
Time interval is from 0.292 sec. to 1.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29665 ( -8.70335 6.29577 )
beta : -1.46733 ( -0.128359 0.126619 )
Epeak [keV] : 45.1908 ( -0.420898 1.171875E-02) )
Norm@50keV : 0.181795 ( -8.791521E-03 8.763663E-03) )
------------------------------------------------------------
Chi-Squared = 63.02316 using 59 PHA bins.
Reduced chi-squared = 1.145876 for 55 degrees of freedom
Null hypothesis probability = 0.214
Photon flux (15-150 keV) in 1.000 sec: 14.5414 ( -1.1352 1.1332 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12123e-06 ( -9.409e-08 9.3518e-08 ) ergs/cm2
Plot creation:
Tue Sep 2 08:59:02 EDT 2008