batgrbproduct Analysis for Trigger=209755
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 Jan 1 12:03:27 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger209755/GCN5_download_cron
======================================================================
Trigger: 00209755 Segment: 000
BAT Trigger Time: 169168401.92 [s; MET]
Trigger Stop: 169168406.016 [s; MET]
UTC: 2006-05-12T23:13:20.730480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 195.772493538686 Dec: 41.2119095233357 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.39
Image Trigger?: NO
Rate S/N Ratio: 11.6619037896906 [ if not an image trigger ]
Image S/N Ratio: 9.39
Flight Position: [ source = BAT ]
RA: 195.772493538686 Dec: 41.2119095233357 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 195.745180609779 Dec: 41.2098566943351 [deg; J2000]
{ 13h 02m 58.8s , +41d 12' 35.5" }
+/- 1.90536190270406 [arcmin] (estimated 90% radius based on SNR)
+/- 0.743801100421648 [arcmin] (formal 1-sigma fit error)
SNR: 12.1101787973048
RA = 13h 2m 58.8s (195.745181 deg.)
Dec = 41d 12' 35" (41.209857 deg.)
Angular difference between Flight and Ground position is 1.238972 arcmin
Partial Coding Fraction: 0.4179688 [ including projection effects ]
Duration
T90: 8.48800000548363 +/- 1.58984402433081
Measured from: -3.63999998569489
to: 4.84800001978874 [s; relative to TRIGTIME]
T50: 4.27200001478195 +/- 1.35597198191131
Measured from: -0.863999992609024
to: 3.40800002217293 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.2960000038147
to: 4.2960000038147 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.36399999260902
to: 5.30400002002716 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.196743 0.195069 0.057354 0.013520
0.023460 0.023303 0.019228 0.016769 [error]
Peak 0.036568 0.042840 0.009063 -0.007177
0.007708 0.007569 0.006249 0.005361 [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 7.52e-08 7.68e-08 5.52e-08 6.35e-08 2.32e-07 2.70e-07 erg/cm2
Error 1.32e-08 1.21e-08 1.69e-08 3.64e-08 4.02e-08 6.11e-08 erg/cm2
Peak flux Power-law 5.41e-01 2.54e-01 7.21e-02 2.57e-02 8.82e-01 8.93e-01 ph/cm2/s
Error 1.40e-01 7.09e-02 3.98e-02 2.54e-02 2.00e-01 2.05e-01 ph/cm2/s
Fluence Cutoff-PL 7.24e-08 8.81e-08 4.00e-08 5.21e-09 2.05e-07 2.05e-07 erg/cm2
Error 1.43e-08 1.74e-08 3.28e-08 2.07e-08 4.34e-08 5.98e-08 erg/cm2
Peak flux Cutoff-PL 5.06e-01 3.21e-01 3.47e-02 2.91e-04 8.61e-01 8.62e-01 ph/cm2/s
Error 1.60e-01 1.04e-01 4.94e-02 1.39e-02 1.99e-01 1.99e-01 ph/cm2/s
Fluence Band 6.07e-08 8.02e-08 5.61e-08 6.52e-08 2.34e-07 3.46e-07 erg/cm2
Error 8.76e-09 1.25e-08 1.98e-08 3.74e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 5.18e-01 3.15e-01 4.14e-02 6.83e-04 8.68e-01 8.93e-01 ph/cm2/s
Error 1.60e-01 9.22e-02 2.81e-02 1.59e-02 1.96e-01 2.04e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.476 0.297 - - 2.41e-03 5.46e-04 36.133 57
CPL 1.011 1.752 23.0 16.0 2.17e-02 5.70e-01 33.583 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.816 0.523 - - 3.65e-03 1.58e-03 67.239 57
CPL -0.163 2.503 22.9 11.1 3.78e-01 9.95e+00 64.440 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 9.668 -4.364 5.304
T90 8.488 -3.640 4.848
T50 4.272 -0.864 3.408
Peak 1.000 3.296 4.296
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
195.7452 +41.2099 0.0158 35.4 148.7 0.5266 12.1 TRIG_00209755
------------------------------------------
Foreground time interval of the image:
-4.364 5.304 (delta_t = 9.668 [sec])
Background time interval of the image:
-239.920 -4.364 (delta_t = 235.556 [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 -4.364 sec. to 5.304 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.47614 ( -0.281010 0.313688 )
Norm@50keV : 2.414587E-03 ( -5.490219E-04 5.426363E-04) )
------------------------------------------------------------
Chi-Squared = 36.13293 using 59 PHA bins.
Reduced chi-squared = 0.6339111 for 57 degrees of freedom
Null hypothesis probability = 0.986
Photon flux (15-150 keV) in 9.668 sec: 0.467487 ( -0.065992 0.065992 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3203e-07 ( -3.95286e-08 4.09266e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.364 sec. to 5.304 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.01061 ( -2.51780 0.985499 )
Epeak [keV] : 22.9860 ( -22.9760 8.99209 )
Norm@50keV : 2.170248E-02 ( -1.791451E-02 1.12185 )
------------------------------------------------------------
Chi-Squared = 33.58275 using 59 PHA bins.
but latest trial 1.99611 gives Chi-Squared = 5.62921
but latest trial 3.373526E-03 gives Chi-Squared = 11.1824
Reduced chi-squared = 0.5996919 for 56 degrees of freedom
Null hypothesis probability = 0.992
Photon flux (15-150 keV) in 9.668 sec: 0.453047 ( -0.067108 0.067487 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05063e-07 ( -3.90365e-08 4.78247e-08 ) ergs/cm2
Band function
Time interval is from -4.364 sec. to 5.304 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17573 ( -7.75261 6.17573 )
beta : -3.23488 ( -6.76512 0.853977 )
Epeak [keV] : 21.7511 ( -21.6511 8.74929 )
Norm@50keV : 1.677450E-02 ( -0.130897 310.484 )
------------------------------------------------------------
Chi-Squared = 33.41764 using 59 PHA bins.
Reduced chi-squared = 0.6075935 for 55 degrees of freedom
Null hypothesis probability = 0.991
Photon flux (15-150 keV) in 9.668 sec: 0.458807 ( -0.064845 0.067029 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3375e-07 ( -3.75012e-08 3.73465e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.296 sec. to 4.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.81563 ( -0.463215 0.583767 )
Norm@50keV : 3.653885E-03 ( -1.540158E-03 1.610514E-03) )
------------------------------------------------------------
Chi-Squared = 67.23944 using 59 PHA bins.
Reduced chi-squared = 1.179639 for 57 degrees of freedom
Null hypothesis probability = 0.166
Photon flux (15-150 keV) in 1.000 sec: 0.882079 ( -0.200367 0.200621 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.05864e-08 ( -1.11478e-08 1.19914e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.296 sec. to 4.296 sec.
Parameters : value lower 90% higher 90%
Photon index: -0.163132 ( -2.83687 2.16845 )
Epeak [keV] : 22.8986 ( -14.5692 7.69863 )
Norm@50keV : 0.378131 ( -0.378131 19.5210 )
------------------------------------------------------------
Chi-Squared = 64.43992 using 59 PHA bins.
but latest trial 2.01203 gives Chi-Squared = 11.6178
but latest trial 8.32945 gives Chi-Squared = 0.742584
Reduced chi-squared = 1.150713 for 56 degrees of freedom
Null hypothesis probability = 0.205
Photon flux (15-150 keV) in 1.000 sec: 0.861378 ( -0.196612 0.200562 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.61045e-08 ( -9.3424e-09 1.16478e-08 ) ergs/cm2
Band function
Time interval is from 3.296 sec. to 4.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43904 ( -8.56096 6.43904 )
beta : -9.36580 ( -0.634201 19.3658 )
Epeak [keV] : 14.2512 ( -9.10743 59.5639 )
Norm@50keV : 2.852483E-02 ( -1.99136 540.171 )
------------------------------------------------------------
Chi-Squared = 64.99096 using 59 PHA bins.
Reduced chi-squared = 1.181654 for 55 degrees of freedom
Null hypothesis probability = 0.168
Photon flux (15-150 keV) in 1.000 sec: 0.867981 ( -0.201474 0.191199 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76311e-08 ( -9.8232e-09 1.064e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 12:26:17 EST 2008