batgrbproduct Analysis for Trigger=222154
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 22:38:50 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger222154/GCN5_download_cron
======================================================================
Trigger: 00222154 Segment: 000
BAT Trigger Time: 176127376.512 [s; MET]
Trigger Stop: 176127377.024 [s; MET]
UTC: 2006-08-01T12:16:15.158880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 213.024750261889 Dec: 16.984129194985 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.35
Image Trigger?: NO
Rate S/N Ratio: 30.0333148353624 [ if not an image trigger ]
Image S/N Ratio: 9.35
Flight Position: [ source = BAT ]
RA: 213.024750261889 Dec: 16.984129194985 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 212.99240464216 Dec: 16.9856263070902 [deg; J2000]
{ 14h 11m 58.2s , +16d 59' 08.3" }
+/- 1.80113782770161 [arcmin] (estimated 90% radius based on SNR)
+/- 0.711723027151442 [arcmin] (formal 1-sigma fit error)
SNR: 13.123549456455
RA = 14h 11m 58.2s (212.992405 deg.)
Dec = 16d 59' 8" (16.985626 deg.)
Angular difference between Flight and Ground position is 1.858258 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.504000008106232 +/- 0.0609262026599676
Measured from: 0.0520000159740448
to: 0.556000024080276 [s; relative to TRIGTIME]
T50: 0.312000006437302 +/- 0.0688186099521425
Measured from: 0.124000012874603
to: 0.436000019311905 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.185999989509583
to: 0.814000010490417 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0360000133514404
to: 0.587999999523163 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.011290 0.028015 0.041510 0.016725
0.003632 0.004121 0.004085 0.003797 [error]
Peak 0.011325 0.028158 0.041820 0.016475
0.003646 0.004130 0.004095 0.003800 [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 2.91e-09 1.01e-08 2.91e-08 2.57e-07 8.03e-08 2.93e-07 erg/cm2
Error 9.51e-10 1.97e-09 3.56e-09 7.93e-08 1.02e-08 0.00e+00 erg/cm2
Peak flux Power-law 1.68e-01 3.11e-01 4.46e-01 1.35e+00 1.27e+00 2.27e+00 ph/cm2/s
Error 5.50e-02 6.24e-02 5.40e-02 3.77e-01 1.63e-01 3.66e-01 ph/cm2/s
Fluence Cutoff-PL 2.31e-09 1.02e-08 3.17e-08 1.25e-07 7.94e-08 1.38e-07 erg/cm2
Error 1.24e-09 2.18e-09 5.25e-09 1.07e-07 1.32e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.67e-01 3.11e-01 4.46e-01 1.34e+00 1.27e+00 2.27e+00 ph/cm2/s
Error 5.50e-02 6.24e-02 5.41e-02 3.75e-01 1.62e-01 3.64e-01 ph/cm2/s
Fluence Band 2.29e-09 1.02e-08 3.16e-08 1.25e-07 7.94e-08 1.49e-07 erg/cm2
Error 1.23e-09 2.17e-09 5.25e-09 1.34e-07 1.08e-08 0.00e+00 erg/cm2
Peak flux Band 1.12e-01 3.20e-01 4.81e-01 1.07e+00 1.23e+00 1.98e+00 ph/cm2/s
Error 7.56e-02 5.92e-02 7.62e-02 7.86e-01 1.73e-01 5.14e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.474 0.243 - - 1.07e-02 1.58e-03 57.381 57
CPL -0.221 1.117 210.4 5000.0 1.96e-02 2.51e-02 56.125 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.482 0.241 - - 1.07e-02 1.57e-03 57.025 57
CPL -0.282 1.181 196.3 4944.7 2.09e-02 2.75e-02 55.529 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: 0.448000 sec.
T50 in the 50-300 keV band: 0.320000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.552 0.036 0.588
T90 0.504 0.052 0.556
T50 0.312 0.124 0.436
Peak 1.000 -0.186 0.814
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.9924 +16.9856 0.0147 9.1 150.5 0.0990 13.1 TRIG_00222154
------------------------------------------
Foreground time interval of the image:
0.036 0.588 (delta_t = 0.552 [sec])
Background time interval of the image:
-239.512 0.036 (delta_t = 239.548 [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 0.036 sec. to 0.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.474017 ( -0.253171 0.232667 )
Norm@50keV : 1.068409E-02 ( -1.610264E-03 1.552651E-03) )
------------------------------------------------------------
Chi-Squared = 57.38079 using 59 PHA bins.
Reduced chi-squared = 1.006681 for 57 degrees of freedom
Null hypothesis probability = 0.461
Photon flux (15-150 keV) in 0.5520 sec: 1.27091 ( -0.16288 0.16366 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.02917e-08 ( -1.02319e-08 1.02672e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.036 sec. to 0.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.221029 ( -1.37321 0.860103 )
Epeak [keV] : 210.373 ( -210.363 9789.63 )
Norm@50keV : 1.964875E-02 ( -1.006243E-02 4.018357E-02) )
------------------------------------------------------------
Chi-Squared = 56.12486 using 59 PHA bins.
Reduced chi-squared = 1.002230 for 56 degrees of freedom
Null hypothesis probability = 0.470
Photon flux (15-150 keV) in 0.5520 sec: 1.24969 ( -0.16591 0.16641 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.94278e-08 ( -1.09263e-08 1.55278e-08 ) ergs/cm2
Band function
Time interval is from 0.036 sec. to 0.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.608815 ( -14.9997 2.689362E-04) )
beta : -0.474008 ( -0.248279 0.249182 )
Epeak [keV] : 24.8238 ( -24.7245 9975.17 )
Norm@50keV : 1.406976E-02 ( -20.3515 514663. )
------------------------------------------------------------
Chi-Squared = 57.38080 using 59 PHA bins.
Reduced chi-squared = 1.043287 for 55 degrees of freedom
Null hypothesis probability = 0.387
Photon flux (15-150 keV) in 0.5520 sec: 1.23211 ( -0.17082 0.1698 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.93875e-08 ( -1.09164e-08 1.06519e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.036 sec. to 0.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.482161 ( -0.250814 0.230847 )
Norm@50keV : 1.068711E-02 ( -1.597067E-03 1.541748E-03) )
------------------------------------------------------------
Chi-Squared = 57.02452 using 59 PHA bins.
Reduced chi-squared = 1.000430 for 57 degrees of freedom
Null hypothesis probability = 0.474
Photon flux (15-150 keV) in 0.5560 sec: 1.26949 ( -0.16215 0.16291 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.05622e-08 ( -1.02449e-08 1.0276e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.036 sec. to 0.592 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.281948 ( -1.39192 0.969848 )
Epeak [keV] : 196.286 ( -85.6719 9803.71 )
Norm@50keV : 2.088823E-02 ( -1.118923E-02 4.373198E-02) )
------------------------------------------------------------
Chi-Squared = 55.52868 using 59 PHA bins.
but latest trial 0.491511 gives Chi-Squared = 1.47062
Reduced chi-squared = 0.9915836 for 56 degrees of freedom
Null hypothesis probability = 0.493
Photon flux (15-150 keV) in 0.5560 sec: 1.26940 ( -0.1621 0.16286 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.95814e-08 ( -1.10299e-08 1.06835e-08 ) ergs/cm2
Band function
Time interval is from 0.036 sec. to 0.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.586614 ( -14.9997 2.522469E-04) )
beta : -0.482138 ( -0.246916 0.246473 )
Epeak [keV] : 24.9725 ( -24.8732 9975.02 )
Norm@50keV : 1.411247E-02 ( -10.0490 479984. )
------------------------------------------------------------
Chi-Squared = 57.02452 using 59 PHA bins.
Reduced chi-squared = 1.036809 for 55 degrees of freedom
Null hypothesis probability = 0.400
Photon flux (15-150 keV) in 0.5560 sec: 1.22883 ( -0.17867 0.16823 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.94869e-08 ( -1.09782e-08 1.07208e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 22:56:08 EST 2008