batgrbproduct Analysis for Trigger=218582
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 20:05:20 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger218582/GCN5_download_cron
======================================================================
Trigger: 00218582 Segment: 000
BAT Trigger Time: 174431265.024 [s; MET]
Trigger Stop: 174431291.904 [s; MET]
UTC: 2006-07-12T21:07:43.711080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 184.061047100022 Dec: 35.5596913631098 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.67
Image Trigger?: NO
Rate S/N Ratio: 10.3923048454133 [ if not an image trigger ]
Image S/N Ratio: 6.67
Flight Position: [ source = BAT ]
RA: 184.061047100022 Dec: 35.5596913631098 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 184.068729754653 Dec: 35.5425704645346 [deg; J2000]
{ 12h 16m 16.5s , +35d 32' 33.3" }
+/- 2.2692081683826 [arcmin] (estimated 90% radius based on SNR)
+/- 1.29924677710124 [arcmin] (formal 1-sigma fit error)
SNR: 9.43466465531147
RA = 12h 16m 16.5s (184.068730 deg.)
Dec = 35d 32' 33" (35.542570 deg.)
Angular difference between Flight and Ground position is 1.093573 arcmin
Partial Coding Fraction: 0.09570312 [ including projection effects ]
Duration
T90: 26.5919999778271 +/- 4.75956301217577
Measured from: 2.04800000786781
to: 28.6399999856949 [s; relative to TRIGTIME]
T50: 13.0719999670982 +/- 7.41044020466044
Measured from: 11.2000000178814
to: 24.2719999849796 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 16.772000014782
to: 17.772000014782 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.608000010251999
to: 30.2240000069141 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.567508 0.619926 0.437972 0.214706
0.101297 0.103497 0.090750 0.076641 [error]
Peak 0.071752 0.053145 0.059122 0.021843
0.018925 0.018990 0.017156 0.014575 [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 1.96e-07 3.27e-07 4.16e-07 1.06e-06 1.23e-06 1.99e-06 erg/cm2
Error 6.46e-08 6.24e-08 9.12e-08 5.33e-07 2.18e-07 5.82e-07 erg/cm2
Peak flux Power-law 8.53e-01 5.45e-01 2.25e-01 1.26e-01 1.69e+00 1.75e+00 ph/cm2/s
Error 4.09e-01 1.83e-01 1.13e-01 1.17e-01 5.91e-01 5.97e-01 ph/cm2/s
Fluence Cutoff-PL 1.96e-07 3.28e-07 4.16e-07 1.05e-06 1.23e-06 1.97e-06 erg/cm2
Error 6.46e-08 6.25e-08 9.13e-08 5.29e-07 2.18e-07 5.79e-07 erg/cm2
Peak flux Cutoff-PL 6.73e-01 6.17e-01 2.68e-01 5.82e-02 1.60e+00 1.62e+00 ph/cm2/s
Error 6.15e-01 2.36e-01 2.24e-01 1.24e-01 6.30e-01 6.53e-01 ph/cm2/s
Fluence Band 1.91e-07 3.25e-07 4.17e-07 1.07e-06 1.23e-06 2.04e-06 erg/cm2
Error 4.54e-08 5.75e-08 7.87e-08 2.58e-07 2.13e-07 0.00e+00 erg/cm2
Peak flux Band 6.73e-01 6.16e-01 2.68e-01 5.86e-02 1.60e+00 1.62e+00 ph/cm2/s
Error 6.15e-01 2.36e-01 2.18e-01 1.24e-01 7.67e-01 6.49e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.655 0.332 - - 4.47e-03 7.63e-04 54.861 57
CPL 1.654 0.334 9992.8 5000.0 4.48e-03 7.66e-04 54.872 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.278 0.623 - - 9.77e-03 3.95e-03 64.186 57
CPL 1.018 2.540 41.1 5000.0 4.13e-02 1.29e+00 63.551 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 29.616 0.608 30.224
T90 26.592 2.048 28.640
T50 13.072 11.200 24.272
Peak 1.000 16.772 17.772
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
184.0687 +35.5426 0.0205 55.6 -5.0 1.9916 9.4 TRIG_00218582
------------------------------------------
Foreground time interval of the image:
0.608 30.224 (delta_t = 29.616 [sec])
Background time interval of the image:
-239.024 0.608 (delta_t = 239.632 [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 0.608 sec. to 30.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65501 ( -0.331545 0.333075 )
Norm@50keV : 4.473621E-03 ( -7.651739E-04 7.611150E-04) )
------------------------------------------------------------
Chi-Squared = 54.86083 using 59 PHA bins.
Reduced chi-squared = 0.9624708 for 57 degrees of freedom
Null hypothesis probability = 0.556
Photon flux (15-150 keV) in 29.62 sec: 0.585114 ( -0.110682 0.111444 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2318e-06 ( -2.18003e-07 2.18761e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.608 sec. to 30.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65376 ( -0.333426 0.334968 )
Epeak [keV] : 9992.83 ( -9992.82 7.17285 )
Norm@50keV : 4.482922E-03 ( -7.690578E-04 7.635914E-04) )
------------------------------------------------------------
Chi-Squared = 54.87207 using 59 PHA bins.
Reduced chi-squared = 0.9798585 for 56 degrees of freedom
Null hypothesis probability = 0.518
Photon flux (15-150 keV) in 29.62 sec: 0.584863 ( -0.110643 0.111402 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23173e-06 ( -2.18012e-07 2.18963e-07 ) ergs/cm2
Band function
Time interval is from 0.608 sec. to 30.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33900 ( -8.66100 6.33900 )
beta : -1.65501 ( -8.34499 0.331550 )
Epeak [keV] : 20.3284 ( -20.2284 9979.67 )
Norm@50keV : 1.029595E-02 ( -1.029595E-02 183.847 )
------------------------------------------------------------
Chi-Squared = 54.86084 using 59 PHA bins.
Reduced chi-squared = 0.9974697 for 55 degrees of freedom
Null hypothesis probability = 0.480
Photon flux (15-150 keV) in 29.62 sec: 0.577367 ( -0.097405 0.10064 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23284e-06 ( -2.08394e-07 2.16697e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 16.768 sec. to 17.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27803 ( -0.537516 0.708299 )
Norm@50keV : 9.767472E-03 ( -4.140034E-03 3.765629E-03) )
------------------------------------------------------------
Chi-Squared = 64.18594 using 59 PHA bins.
Reduced chi-squared = 1.126069 for 57 degrees of freedom
Null hypothesis probability = 0.239
Photon flux (15-150 keV) in 1.008 sec: 1.68631 ( -0.58866 0.59358 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.36778e-08 ( -3.29407e-08 3.32627e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.768 sec. to 17.776 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.01800 ( -4.01800 1.06253 )
Epeak [keV] : 41.0520 ( -41.0420 9958.95 )
Norm@50keV : 4.127755E-02 ( -3.735480E-02 2.53295 )
------------------------------------------------------------
Chi-Squared = 63.55080 using 59 PHA bins.
but latest trial 2.07250 gives Chi-Squared = 1.01462
but latest trial 2.983991E-03 gives Chi-Squared = 6.54333
Reduced chi-squared = 1.134836 for 56 degrees of freedom
Null hypothesis probability = 0.228
Photon flux (15-150 keV) in 1.008 sec: 1.60336 ( -0.638635 0.62156 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.36892e-08 ( -3.24655e-08 3.32644e-08 ) ergs/cm2
Band function
Time interval is from 16.768 sec. to 17.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00750 ( -8.99250 2.87801 )
beta : -9.31839 ( -0.681609 7.51014 )
Epeak [keV] : 41.2522 ( -41.1522 9958.75 )
Norm@50keV : 4.162731E-02 ( -3.374295E-02 9.09877 )
------------------------------------------------------------
Chi-Squared = 63.55103 using 59 PHA bins.
Reduced chi-squared = 1.155473 for 55 degrees of freedom
Null hypothesis probability = 0.201
Photon flux (15-150 keV) in 1.008 sec: 1.60455 ( -0.912067 0.6223 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.37541e-08 ( -3.27934e-08 3.31088e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 20:29:38 EST 2008