batgrbproduct Analysis for Trigger=215203
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 18:20:07 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger215203/GCN5_download_cron
======================================================================
Trigger: 00215203 Segment: 000
BAT Trigger Time: 172350664 [s; MET]
Trigger Stop: 172350728 [s; MET]
UTC: 2006-06-18T19:11:02.735960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.037364513171 Dec: -42.4148700801938 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.08
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.08
Flight Position: [ source = BAT ]
RA: 255.037364513171 Dec: -42.4148700801938 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.09160897898 Dec: -42.3188083090207 [deg; J2000]
{ 17h 00m 22.0s , -42d 19' 07.7" }
+/- 8.75207598635272 [arcmin] (estimated 90% radius based on SNR)
+/- 6.96996781221475 [arcmin] (formal 1-sigma fit error)
SNR: 1.37165663667937
RA = 17h 0m 22.0s (255.091609 deg.)
Dec = -42d 19' 8" (-42.318808 deg.)
Angular difference between Flight and Ground position is 6.245228 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.071632 0.088786 -0.036279 -0.004439
0.036100 0.030842 0.026131 0.023441 [error]
Peak 0.071632 0.088786 -0.036279 -0.004439
0.036100 0.030842 0.026131 0.023441 [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 2.31e-08 2.06e-08 1.25e-08 1.15e-08 6.14e-08 6.54e-08 erg/cm2
Error 1.51e-08 1.43e-08 1.56e-08 3.13e-08 4.33e-08 7.10e-08 erg/cm2
Peak flux Power-law 2.34e-02 1.16e-02 3.52e-03 1.36e-03 3.91e-02 3.98e-02 ph/cm2/s
Error 1.53e-02 7.67e-03 4.25e-03 3.29e-03 2.35e-02 2.39e-02 ph/cm2/s
Fluence Cutoff-PL 1.96e-08 3.38e-08 6.35e-09 3.24e-11 5.98e-08 6.02e-08 erg/cm2
Error 1.53e-08 2.06e-08 1.38e-08 1.10e-08 3.44e-08 3.44e-08 erg/cm2
Peak flux Cutoff-PL 1.86e-02 1.89e-02 2.04e-03 5.67e-06 3.96e-02 3.96e-02 ph/cm2/s
Error 1.52e-02 1.10e-02 3.98e-03 6.06e-04 2.16e-02 2.16e-02 ph/cm2/s
Fluence Band 2.05e-08 3.09e-08 9.62e-09 3.38e-10 5.64e-08 6.38e-08 erg/cm2
Error 1.49e-08 2.49e-08 1.37e-08 3.37e-10 3.54e-08 0.00e+00 erg/cm2
Peak flux Band 1.71e-02 1.94e-02 1.63e-03 6.96e-06 3.85e-02 4.11e-02 ph/cm2/s
Error 1.85e-02 8.72e-03 3.30e-03 1.58e-04 2.06e-02 2.36e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.705 1.293 - - 1.75e-04 1.74e-04 71.008 57
CPL -2.482 5.354 30.2 14.7 3.71e-01 1.24e+00 68.598 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.705 1.293 - - 1.75e-04 1.74e-04 71.008 57
CPL -2.482 6.320 30.2 14.7 3.71e-01 1.24e+00 68.598 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.0916 -42.3188 0.1404 17.8 -17.0 0.0955 1.4 TRIG_00215203
------------------------------------------
Foreground time interval of the image:
0.000 33.058 (delta_t = 33.058 [sec])
Background time interval of the image:
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 0.000 sec. to 33.058 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.70504 ( -0.964993 1.62103 )
Norm@50keV : 1.749117E-04 ( -1.749117E-04 1.736248E-04) )
------------------------------------------------------------
Chi-Squared = 71.00824 using 59 PHA bins.
Reduced chi-squared = 1.245759 for 57 degrees of freedom
Null hypothesis probability = 0.100
Photon flux (15-150 keV) in 33.06 sec: 3.914710E-02 ( -0.0234243 0.0235088 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13511e-08 ( -3.97004e-08 4.68394e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.058 sec.
Parameters : value lower 90% higher 90%
Photon index: -2.48163 ( -0.518367 10.1897 )
Epeak [keV] : 30.1772 ( -14.1588 15.1629 )
Norm@50keV : 0.371025 ( -0.371025 2.11607 )
------------------------------------------------------------
Chi-Squared = 68.59789 using 59 PHA bins.
but latest trial 16.0047 gives Chi-Squared = 1.07221
but latest trial 2.44396 gives Chi-Squared = 279.932
Reduced chi-squared = 1.224962 for 56 degrees of freedom
Null hypothesis probability = 0.120
Photon flux (15-150 keV) in 33.06 sec: 3.961939E-02 ( -0.0207439 0.0225217 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98313e-08 ( -3.19276e-08 3.68007e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.058 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.88665 ( -8.83041 3.22844 )
beta : -8.65804 ( -0.631564 7.34134 )
Epeak [keV] : 4.94556 ( -16.0320 41.6478 )
Norm@50keV : 6.128726E-04 ( -2.230547E-03 37028.8 )
------------------------------------------------------------
Chi-Squared = 70.10968 using 59 PHA bins.
Reduced chi-squared = 1.274722 for 55 degrees of freedom
Null hypothesis probability = 8.245E-02
Photon flux (15-150 keV) in 33.06 sec: 3.850116E-02 ( -0.0200818 0.0211193 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.6405e-08 ( -2.82684e-08 4.24318e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.058 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.70504 ( -0.964993 1.62103 )
Norm@50keV : 1.749117E-04 ( -1.749117E-04 1.736248E-04) )
------------------------------------------------------------
Chi-Squared = 71.00824 using 59 PHA bins.
Reduced chi-squared = 1.245759 for 57 degrees of freedom
Null hypothesis probability = 0.100
Photon flux (15-150 keV) in 33.06 sec: 3.914710E-02 ( -0.0234243 0.0235088 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13511e-08 ( -3.97004e-08 4.68394e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.058 sec.
Parameters : value lower 90% higher 90%
Photon index: -2.48163 ( -0.518367 12.1210 )
Epeak [keV] : 30.1772 ( -14.1588 15.1629 )
Norm@50keV : 0.371025 ( -0.371025 2.11607 )
------------------------------------------------------------
Chi-Squared = 68.59789 using 59 PHA bins.
but latest trial 16.0047 gives Chi-Squared = 1.07221
but latest trial 2.44396 gives Chi-Squared = 279.932
Reduced chi-squared = 1.224962 for 56 degrees of freedom
Null hypothesis probability = 0.120
Photon flux (15-150 keV) in 33.06 sec: 3.961939E-02 ( -0.0207439 0.0225217 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98313e-08 ( -3.19276e-08 3.68007e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.058 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.88665 ( -8.83041 3.22844 )
beta : -8.65804 ( -0.631564 7.34134 )
Epeak [keV] : 4.94556 ( -16.0320 41.6478 )
Norm@50keV : 6.128726E-04 ( -2.230547E-03 37028.8 )
------------------------------------------------------------
Chi-Squared = 70.10968 using 59 PHA bins.
Reduced chi-squared = 1.274722 for 55 degrees of freedom
Null hypothesis probability = 8.245E-02
Photon flux (15-150 keV) in 33.06 sec: 3.850116E-02 ( -0.0200818 0.0211193 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.6405e-08 ( -2.82684e-08 4.24318e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 18:25:17 EST 2008