batgrbproduct Analysis for Trigger=224364
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): Wed Jan 2 00:33:34 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger224364/GCN5_download_cron
======================================================================
Trigger: 00224364 Segment: 000
BAT Trigger Time: 177202224.064 [s; MET]
Trigger Stop: 177202224.32 [s; MET]
UTC: 2006-08-13T22:50:22.685460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 111.867644154714 Dec: -29.8505718934776 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.17
Image Trigger?: NO
Rate S/N Ratio: 11.13552872566 [ if not an image trigger ]
Image S/N Ratio: 7.17
Flight Position: [ source = BAT ]
RA: 111.867644154714 Dec: -29.8505718934776 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 111.895043824784 Dec: -29.8442583212769 [deg; J2000]
{ 07h 27m 34.8s , -29d 50' 39.3" }
+/- 0.595695385700121 [arcmin] (estimated 90% radius based on SNR)
+/- 0.169783983337958 [arcmin] (formal 1-sigma fit error)
SNR: 63.7547179109307
RA = 7h 27m 34.8s (111.895044 deg.)
Dec = -29d 50' 39" (-29.844258 deg.)
Angular difference between Flight and Ground position is 1.475374 arcmin
Partial Coding Fraction: 0.3945312 [ including projection effects ]
Duration
T90: 16.1240000128746 +/- 3.37232025553383
Measured from: 1.1879999935627
to: 17.3120000064373 [s; relative to TRIGTIME]
T50: 4.19600000977516 +/- 0.122441814998907
Measured from: 3.23199999332428
to: 7.42800000309944 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.59199997782707
to: 4.59199997782707 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.488000005483627
to: 36.1719999909401 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.866809 2.890444 2.551274 0.645197
0.048122 0.051943 0.048492 0.036967 [error]
Peak 0.229561 0.361425 0.380384 0.106143
0.011603 0.013775 0.013999 0.009493 [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 6.42e-07 1.28e-06 1.99e-06 6.77e-06 5.54e-06 1.06e-05 erg/cm2
Error 3.30e-08 3.80e-08 5.16e-08 4.21e-07 1.31e-07 0.00e+00 erg/cm2
Peak flux Power-law 2.24e+00 2.77e+00 2.49e+00 3.89e+00 8.84e+00 1.14e+01 ph/cm2/s
Error 1.96e-01 1.45e-01 1.12e-01 3.85e-01 3.86e-01 4.83e-01 ph/cm2/s
Fluence Cutoff-PL 5.77e-07 1.29e-06 2.06e-06 4.57e-06 5.46e-06 8.29e-06 erg/cm2
Error 4.50e-08 3.98e-08 6.52e-08 9.22e-07 1.05e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.13e+00 2.79e+00 2.56e+00 3.30e+00 8.77e+00 1.08e+01 ph/cm2/s
Error 2.64e-01 1.51e-01 1.50e-01 8.24e-01 3.98e-01 9.39e-01 ph/cm2/s
Fluence Band 5.73e-07 1.29e-06 2.06e-06 4.58e-06 5.46e-06 7.97e-06 erg/cm2
Error 4.46e-08 3.97e-08 6.52e-08 9.22e-07 1.39e-07 0.00e+00 erg/cm2
Peak flux Band 2.12e+00 2.79e+00 2.56e+00 3.30e+00 8.77e+00 1.08e+01 ph/cm2/s
Error 2.64e-01 1.51e-01 1.50e-01 8.23e-01 4.01e-01 9.38e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.366 0.044 - - 1.55e-02 3.64e-04 54.255 57
CPL 1.009 0.192 166.1 76.8 2.20e-02 4.01e-03 43.525 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.152 0.075 - - 7.58e-02 3.13e-03 40.349 57
CPL 0.965 0.276 334.1 5000.0 9.11e-02 2.52e-02 39.232 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: 6.720000 sec.
T50 in the 50-300 keV band: 3.584000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 36.660 -0.488 36.172
T90 16.124 1.188 17.312
T50 4.196 3.232 7.428
Peak 1.000 3.592 4.592
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
111.8950 -29.8443 0.0030 34.3 -118.4 7.0291 63.8 TRIG_00224364
------------------------------------------
Foreground time interval of the image:
-0.488 8.337 (delta_t = 8.825 [sec])
Background time interval of the image:
-239.064 -0.488 (delta_t = 238.576 [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 -0.488 sec. to 36.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36640 ( -4.446089E-02 4.437280E-02) )
Norm@50keV : 1.553584E-02 ( -3.642440E-04 3.639497E-04) )
------------------------------------------------------------
Chi-Squared = 54.25475 using 59 PHA bins.
Reduced chi-squared = 0.9518377 for 57 degrees of freedom
Null hypothesis probability = 0.579
Photon flux (15-150 keV) in 36.66 sec: 1.87806 ( -0.05038 0.05059 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.54244e-06 ( -1.30656e-07 1.30803e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.488 sec. to 36.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00873 ( -0.193362 0.190688 )
Epeak [keV] : 166.065 ( -37.6698 115.837 )
Norm@50keV : 2.196490E-02 ( -3.627336E-03 4.386675E-03) )
------------------------------------------------------------
Chi-Squared = 43.52466 using 59 PHA bins.
Reduced chi-squared = 0.7772260 for 56 degrees of freedom
Null hypothesis probability = 0.888
Photon flux (15-150 keV) in 36.66 sec: 1.82746 ( -0.05575 0.05621 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.45952e-06 ( -1.39968e-07 6.96907e-08 ) ergs/cm2
Band function
Time interval is from -0.488 sec. to 36.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01182 ( -0.187549 0.196492 )
beta : -9.18817 ( -0.811831 7.69474 )
Epeak [keV] : 167.044 ( -38.6688 114.754 )
Norm@50keV : 2.189432E-02 ( -3.558125E-03 4.455937E-03) )
------------------------------------------------------------
Chi-Squared = 43.52428 using 59 PHA bins.
Reduced chi-squared = 0.7913505 for 55 degrees of freedom
Null hypothesis probability = 0.868
Photon flux (15-150 keV) in 36.66 sec: 1.82753 ( -0.05583 0.05619 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.45548e-06 ( -1.39858e-07 1.38905e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.592 sec. to 4.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15185 ( -7.475495E-02 7.442498E-02) )
Norm@50keV : 7.578456E-02 ( -3.133908E-03 3.127657E-03) )
------------------------------------------------------------
Chi-Squared = 40.34941 using 59 PHA bins.
Reduced chi-squared = 0.7078845 for 57 degrees of freedom
Null hypothesis probability = 0.954
Photon flux (15-150 keV) in 1.000 sec: 8.83995 ( -0.3852 0.386 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.79718e-07 ( -3.404e-08 3.4095e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.592 sec. to 4.592 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.965092 ( -0.311341 0.240087 )
Epeak [keV] : 334.104 ( -334.094 9665.90 )
Norm@50keV : 9.109669E-02 ( -1.881468E-02 3.156808E-02) )
------------------------------------------------------------
Chi-Squared = 39.23185 using 59 PHA bins.
but latest trial 7.621764E-02 gives Chi-Squared = 1.05424
Reduced chi-squared = 0.7005687 for 56 degrees of freedom
Null hypothesis probability = 0.957
Photon flux (15-150 keV) in 1.000 sec: 8.76729 ( -0.39915 0.39637 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.76868e-07 ( -3.4927e-08 3.4109e-08 ) ergs/cm2
Band function
Time interval is from 3.592 sec. to 4.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.908190 ( -9.09181 5.90675 )
beta : -1.15185 ( -7.441413E-02 7.475603E-02) )
Epeak [keV] : 53.6301 ( -9999.84 6.054688E-02) )
Norm@50keV : 0.136992 ( -3.147021E-03 3.138252E-03) )
------------------------------------------------------------
Chi-Squared = 40.34942 using 59 PHA bins.
Reduced chi-squared = 0.7336259 for 55 degrees of freedom
Null hypothesis probability = 0.930
Photon flux (15-150 keV) in 1.000 sec: 8.76752 ( -0.40016 0.40176 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.76306e-07 ( -3.49e-08 3.4645e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 00:55:08 EST 2008