batgrbproduct Analysis for Trigger=222683
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 23:30:16 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger222683/SDC
======================================================================
Trigger: 00222683 Segment: 000
BAT Trigger Time: 176446070.528 [s; MET]
Trigger Stop: 176446074.624 [s; MET]
UTC: 2006-08-05T04:47:49.167340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 220.918978393931 Dec: 12.5923851602665 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.64
Image Trigger?: NO
Rate S/N Ratio: 10.7238052947636 [ if not an image trigger ]
Image S/N Ratio: 7.64
Flight Position: [ source = BAT ]
RA: 220.918978393931 Dec: 12.5923851602665 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 220.931361154847 Dec: 12.5812827225618 [deg; J2000]
{ 14h 43m 43.5s , +12d 34' 52.6" }
+/- 2.83331140592534 [arcmin] (estimated 90% radius based on SNR)
+/- 1.39515683422157 [arcmin] (formal 1-sigma fit error)
SNR: 6.87042576627886
RA = 14h 43m 43.5s (220.931361 deg.)
Dec = 12d 34' 53" (12.581283 deg.)
Angular difference between Flight and Ground position is 0.984650 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 5.52000001072884 +/- 1.73462734396577
Measured from: -1.23600000143051
to: 4.28400000929832 [s; relative to TRIGTIME]
T50: 2.46799999475479 +/- 1.73303893682116
Measured from: 0.72800001502037
to: 3.19600000977516 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.719999998807907
to: 1.71999999880791 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.5959999859333
to: 4.52000001072884 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.056963 0.071711 0.023000 -0.001825
0.011582 0.011612 0.010192 0.008638 [error]
Peak 0.013528 0.022774 0.006904 0.000765
0.004874 0.004866 0.004185 0.003444 [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 1.91e-08 2.30e-08 2.00e-08 2.98e-08 7.25e-08 9.08e-08 erg/cm2
Error 4.92e-09 5.25e-09 8.52e-09 2.45e-08 1.99e-08 3.58e-08 erg/cm2
Peak flux Power-law 1.38e-01 1.13e-01 6.26e-02 5.10e-02 3.36e-01 3.64e-01 ph/cm2/s
Error 6.13e-02 3.69e-02 3.14e-02 4.97e-02 1.10e-01 1.22e-01 ph/cm2/s
Fluence Cutoff-PL 1.84e-08 2.76e-08 1.22e-08 9.72e-10 5.91e-08 5.93e-08 erg/cm2
Error 5.44e-09 7.81e-09 1.21e-08 2.24e-08 2.16e-08 3.55e-08 erg/cm2
Peak flux Cutoff-PL 1.18e-01 1.60e-01 2.88e-02 2.14e-04 3.08e-01 3.08e-01 ph/cm2/s
Error 6.13e-02 5.80e-02 4.51e-02 1.99e-02 1.05e-01 1.06e-01 ph/cm2/s
Fluence Band 1.82e-08 2.71e-08 1.42e-08 1.02e-08 6.45e-08 7.44e-08 erg/cm2
Error 5.50e-09 7.00e-09 5.23e-09 5.21e-09 1.64e-08 3.60e-08 erg/cm2
Peak flux Band 1.28e-01 1.39e-01 5.56e-02 2.15e-02 3.35e-01 3.49e-01 ph/cm2/s
Error 6.52e-02 4.81e-02 3.20e-02 4.26e-02 1.08e-01 1.32e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.201 0.421 - - 1.26e-03 3.97e-04 56.962 57
CPL 0.450 0.000 30.1 5000.0 1.72e-02 1.15e+00 55.127 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.851 0.575 - - 2.39e-03 9.45e-04 48.433 57
CPL -1.063 0.000 37.3 9.5 1.69e-01 4.20e+00 46.374 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 6.116 -1.596 4.520
T90 5.520 -1.236 4.284
T50 2.468 0.728 3.196
Peak 1.000 0.720 1.720
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
220.9314 +12.5813 0.0280 8.8 104.7 0.1451 6.9 TRIG_00222683
------------------------------------------
Foreground time interval of the image:
-1.596 4.520 (delta_t = 6.116 [sec])
Background time interval of the image:
-239.528 -1.596 (delta_t = 237.932 [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 -1.596 sec. to 4.520 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20052 ( -0.390765 0.451445 )
Norm@50keV : 1.260703E-03 ( -4.006282E-04 3.934758E-04) )
------------------------------------------------------------
Chi-Squared = 56.96207 using 59 PHA bins.
Reduced chi-squared = 0.9993346 for 57 degrees of freedom
Null hypothesis probability = 0.477
Photon flux (15-150 keV) in 6.116 sec: 0.208764 ( -0.043634 0.043673 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.25254e-08 ( -1.9213e-08 2.05754e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.596 sec. to 4.520 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.449508 ( )
Epeak [keV] : 30.1386 ( -29.9505 9970.04 )
Norm@50keV : 1.718002E-02 ( -1.765073E-02 2.28199 )
------------------------------------------------------------
Chi-Squared = 55.12726 using 59 PHA bins.
Reduced chi-squared = 0.9844154 for 56 degrees of freedom
Null hypothesis probability = 0.508
Photon flux (15-150 keV) in 6.116 sec: 0.198993 ( -0.044822 0.045278 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.90511e-08 ( -1.73592e-08 2.5831e-08 ) ergs/cm2
Band function
Time interval is from -1.596 sec. to 4.520 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.75881 ( -8.24119 0.800502 )
beta : -8.55846 ( 0.00000 0.779791 )
Epeak [keV] : 10.6144 ( -19.4068 9980.12 )
Norm@50keV : 3.257442E-03 ( -3.888164E-02 35.1166 )
------------------------------------------------------------
Chi-Squared = 57.06421 using 59 PHA bins.
Reduced chi-squared = 1.037531 for 55 degrees of freedom
Null hypothesis probability = 0.398
Photon flux (15-150 keV) in 6.116 sec: 0.201051 ( -0.041206 0.043047 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.4522e-08 ( -1.87605e-08 1.41127e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.720 sec. to 1.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85113 ( -0.540358 0.610013 )
Norm@50keV : 2.389899E-03 ( -9.620695E-04 9.271293E-04) )
------------------------------------------------------------
Chi-Squared = 48.43264 using 59 PHA bins.
Reduced chi-squared = 0.8496954 for 57 degrees of freedom
Null hypothesis probability = 0.783
Photon flux (15-150 keV) in 1.000 sec: 0.336085 ( -0.109745 0.109747 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19667e-08 ( -8.3919e-09 9.0274e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.720 sec. to 1.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.06276 ( )
Epeak [keV] : 37.3166 ( -7.80173 11.1746 )
Norm@50keV : 0.168857 ( -2.61009 5.79024 )
------------------------------------------------------------
Chi-Squared = 46.37405 using 59 PHA bins.
Reduced chi-squared = 0.8281080 for 56 degrees of freedom
Null hypothesis probability = 0.817
Photon flux (15-150 keV) in 1.000 sec: 0.307915 ( -0.096546 0.113912 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54811e-08 ( -5.2092e-09 1.12599e-08 ) ergs/cm2
Band function
Time interval is from 0.720 sec. to 1.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.295214 ( -9.70479 5.29521 )
beta : -4.41265 ( -7.58862 12.2950 )
Epeak [keV] : 42.2917 ( -37.0591 40.4044 )
Norm@50keV : 2.187888E-02 ( -40.4951 17.2437 )
------------------------------------------------------------
Chi-Squared = 46.78071 using 59 PHA bins.
Reduced chi-squared = 0.8505584 for 55 degrees of freedom
Null hypothesis probability = 0.777
Photon flux (15-150 keV) in 1.000 sec: 0.334944 ( -0.106795 0.108871 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95285e-08 ( -7.952e-09 4.6082e-09 ) ergs/cm2
Plot creation:
Tue Jan 1 23:45:25 EST 2008