batgrbproduct Analysis for Trigger=219646
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 20:59:23 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger219646/SDC
======================================================================
Trigger: 00219646 Segment: 000
BAT Trigger Time: 174820060.224 [s; MET]
Trigger Stop: 174820062.272 [s; MET]
UTC: 2006-07-17T09:07:38.901820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.861533651496 Dec: 28.948397280501 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.68
Image Trigger?: NO
Rate S/N Ratio: 9.69535971483266 [ if not an image trigger ]
Image S/N Ratio: 6.68
Flight Position: [ source = BAT ]
RA: 170.861533651496 Dec: 28.948397280501 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.857256177184 Dec: 28.9737085521781 [deg; J2000]
{ 11h 23m 25.7s , +28d 58' 25.4" }
+/- 2.68656207348256 [arcmin] (estimated 90% radius based on SNR)
+/- 1.15800415970057 [arcmin] (formal 1-sigma fit error)
SNR: 7.41276070621409
RA = 11h 23m 25.7s (170.857256 deg.)
Dec = 28d 58' 25" (28.973709 deg.)
Angular difference between Flight and Ground position is 1.535188 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 3 +/- 1.4142135623731
Measured from: -0.224000006914139
to: 2.77599999308586 [s; relative to TRIGTIME]
T50: 1 +/- 1
Measured from: 0.775999993085861
to: 1.77599999308586 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.775999993085861
to: 1.77599999308586 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.224000006914139
to: 2.77599999308586 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.035584 0.047513 0.024511 0.009371
0.008088 0.008210 0.007295 0.006427 [error]
Peak 0.023420 0.027061 0.011016 0.003563
0.004718 0.004871 0.004272 0.003739 [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 1.09e-08 1.76e-08 2.16e-08 5.24e-08 6.50e-08 1.02e-07 erg/cm2
Error 3.25e-09 3.56e-09 6.81e-09 3.41e-08 1.60e-08 4.08e-08 erg/cm2
Peak flux Power-law 2.26e-01 1.80e-01 9.60e-02 7.47e-02 5.36e-01 5.77e-01 ph/cm2/s
Error 6.30e-02 3.73e-02 3.23e-02 4.71e-02 1.11e-01 1.23e-01 ph/cm2/s
Fluence Cutoff-PL 9.99e-09 1.99e-08 2.09e-08 1.15e-08 5.84e-08 6.33e-08 erg/cm2
Error 3.74e-09 5.52e-09 8.75e-09 4.23e-08 1.87e-08 4.80e-08 erg/cm2
Peak flux Cutoff-PL 1.80e-01 2.31e-01 9.12e-02 7.29e-03 5.09e-01 5.10e-01 ph/cm2/s
Error 7.84e-02 5.57e-02 4.12e-02 2.22e-02 8.36e-02 1.12e-01 ph/cm2/s
Fluence Band 9.59e-09 2.06e-08 1.98e-08 2.63e-08 5.97e-08 7.54e-08 erg/cm2
Error 3.88e-09 5.38e-09 7.23e-09 4.08e-08 1.28e-08 4.80e-08 erg/cm2
Peak flux Band 1.90e-01 2.25e-01 8.67e-02 1.04e-02 5.05e-01 5.27e-01 ph/cm2/s
Error 3.64e-02 4.49e-02 3.05e-02 3.20e-02 1.03e-01 1.11e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.702 0.367 - - 2.34e-03 5.46e-04 48.945 57
CPL 0.719 2.135 55.1 5000.0 8.58e-03 1.94e-01 48.069 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.904 0.364 - - 3.73e-03 9.70e-04 61.904 57
CPL -0.431 2.223 42.9 14.6 8.29e-02 8.84e-01 57.186 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 3.000 -0.224 2.776
T90 3.000 -0.224 2.776
T50 1.000 0.776 1.776
Peak 1.000 0.776 1.776
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.8573 +28.9737 0.0258 13.0 -130.5 0.1105 7.4 TRIG_00219646
------------------------------------------
Foreground time interval of the image:
-0.224 2.776 (delta_t = 3.000 [sec])
Background time interval of the image:
-239.224 -0.224 (delta_t = 239.000 [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 -0.224 sec. to 2.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70204 ( -0.355349 0.377918 )
Norm@50keV : 2.341475E-03 ( -5.553525E-04 5.362586E-04) )
------------------------------------------------------------
Chi-Squared = 48.94480 using 59 PHA bins.
Reduced chi-squared = 0.8586807 for 57 degrees of freedom
Null hypothesis probability = 0.767
Photon flux (15-150 keV) in 3.000 sec: 0.311195 ( -0.062865 0.062879 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.5007e-08 ( -1.57044e-08 1.63779e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.224 sec. to 2.776 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.719082 ( -2.81309 1.45681 )
Epeak [keV] : 55.1030 ( -55.0930 9944.90 )
Norm@50keV : 8.578222E-03 ( -8.578222E-03 0.379965 )
------------------------------------------------------------
Chi-Squared = 48.06944 using 59 PHA bins.
but latest trial 2.17397 gives Chi-Squared = 2.16298
Reduced chi-squared = 0.8583828 for 56 degrees of freedom
Null hypothesis probability = 0.766
Photon flux (15-150 keV) in 3.000 sec: 0.300608 ( -0.066359 0.06541 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83926e-08 ( -1.75047e-08 1.99863e-08 ) ergs/cm2
Band function
Time interval is from -0.224 sec. to 2.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.220238 ( -9.77976 4.60180 )
beta : -2.30270 ( -7.69730 0.859963 )
Epeak [keV] : 46.2534 ( -46.1534 9953.75 )
Norm@50keV : 1.818746E-02 ( -1.818746E-02 45.3834 )
------------------------------------------------------------
Chi-Squared = 47.68953 using 59 PHA bins.
Reduced chi-squared = 0.8670824 for 55 degrees of freedom
Null hypothesis probability = 0.747
Photon flux (15-150 keV) in 3.000 sec: 0.301359 ( -0.063396 0.062659 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.9745e-08 ( -1.69644e-08 8.5911e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.776 sec. to 1.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90376 ( -0.345002 0.383966 )
Norm@50keV : 3.728289E-03 ( -9.841968E-04 9.549104E-04) )
------------------------------------------------------------
Chi-Squared = 61.90431 using 59 PHA bins.
Reduced chi-squared = 1.086040 for 57 degrees of freedom
Null hypothesis probability = 0.305
Photon flux (15-150 keV) in 1.000 sec: 0.535913 ( -0.110653 0.110665 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.42673e-08 ( -8.5726e-09 9.023e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.776 sec. to 1.776 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.430844 ( -2.56916 1.87742 )
Epeak [keV] : 42.8886 ( -10.3248 18.8790 )
Norm@50keV : 8.286614E-02 ( -7.573473E-02 1.69157 )
------------------------------------------------------------
Chi-Squared = 57.18621 using 59 PHA bins.
but latest trial 1.64770 gives Chi-Squared = 4.88554
Reduced chi-squared = 1.021182 for 56 degrees of freedom
Null hypothesis probability = 0.431
Photon flux (15-150 keV) in 1.000 sec: 0.509493 ( -0.05597 0.111264 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9544e-08 ( -7.2004e-09 8.7096e-09 ) ergs/cm2
Band function
Time interval is from 0.776 sec. to 1.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.527631 ( -2.05577 2.76186 )
beta : -9.36999 ( -0.630012 19.3698 )
Epeak [keV] : 42.9048 ( -9.23227 16.4727 )
Norm@50keV : 9.447036E-02 ( -1.881880E-02 3.20271 )
------------------------------------------------------------
Chi-Squared = 57.17962 using 59 PHA bins.
Reduced chi-squared = 1.039629 for 55 degrees of freedom
Null hypothesis probability = 0.394
Photon flux (15-150 keV) in 1.000 sec: 0.504578 ( -0.094847 0.111197 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.01793e-08 ( -6.8165e-09 8.2168e-09 ) ergs/cm2
Plot creation:
Tue Jan 1 21:16:25 EST 2008