batgrbproduct Analysis for Trigger=225393
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 01:26:09 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger225393/GCN5_download_cron
======================================================================
Trigger: 00225393 Segment: 000
BAT Trigger Time: 177691401.856 [s; MET]
Trigger Stop: 177691410.048 [s; MET]
UTC: 2006-08-19T14:43:20.465740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.7406685178 Dec: -28.9031449416071 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.39
Image Trigger?: NO
Rate S/N Ratio: 11.3578166916005 [ if not an image trigger ]
Image S/N Ratio: 8.39
Flight Position: [ source = BAT ]
RA: 266.7406685178 Dec: -28.9031449416071 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.740560714895 Dec: -28.9033913232823 [deg; J2000]
{ 17h 46m 57.7s , -28d 54' 12.2" }
+/- 3.3677895509621 [arcmin] (estimated 90% radius based on SNR)
+/- 1.925182354446 [arcmin] (formal 1-sigma fit error)
SNR: 5.36745557210803
RA = 17h 46m 57.7s (266.740561 deg.)
Dec = -28d 54' 12" (-28.903391 deg.)
Angular difference between Flight and Ground position is 0.015830 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 8.19200000166893 +/-
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
T50: 8.19200000166893 +/-
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 8.19200000166893 second)
Measured from: 1.49011611938477e-08
to: 8.19200001657009 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.161179 0.029452 -0.005185 -0.008633
0.016979 0.014231 0.012037 0.010628 [error]
Peak 0.161179 0.029452 -0.005185 -0.008633
0.016979 0.014231 0.012037 0.010628 [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 4.40e-08 8.90e-09 8.92e-10 9.78e-11 5.38e-08 5.38e-08 erg/cm2
Error 9.19e-09 5.38e-09 1.38e-09 2.99e-10 1.37e-08 1.38e-08 erg/cm2
Peak flux Power-law 1.87e-01 2.20e-02 1.10e-03 5.79e-05 2.10e-01 2.10e-01 ph/cm2/s
Error 3.86e-02 1.27e-02 1.66e-03 1.67e-04 4.66e-02 4.66e-02 ph/cm2/s
Fluence Cutoff-PL 4.39e-08 8.89e-09 8.91e-10 9.69e-11 5.38e-08 5.38e-08 erg/cm2
Error 9.20e-09 5.37e-09 1.38e-09 2.96e-10 1.37e-08 1.38e-08 erg/cm2
Peak flux Cutoff-PL 1.87e-01 2.20e-02 1.10e-03 5.74e-05 2.10e-01 2.10e-01 ph/cm2/s
Error 3.86e-02 1.27e-02 1.65e-03 1.66e-04 4.66e-02 4.66e-02 ph/cm2/s
Fluence Band 4.31e-08 8.26e-09 2.60e-10 7.11e-12 5.44e-08 7.76e-08 erg/cm2
Error 9.09e-09 9.75e-12 1.13e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.94e-01 1.82e-02 1.72e-04 5.27e-07 2.13e-01 2.10e-01 ph/cm2/s
Error 4.00e-02 9.62e-03 1.33e-03 3.96e-05 4.52e-02 4.67e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.318 0.987 - - 1.00e-04 1.26e-04 61.016 57
CPL 1.810 0.000 1.0 0.0 1.25e-01 0.00e+00 59.640 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.318 0.987 - - 1.00e-04 1.26e-04 61.016 57
CPL 1.810 0.000 1.0 0.0 1.25e-01 0.00e+00 59.640 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 8.192 0.000 8.192
T90 8.192 0.000 8.192
T50 8.192 0.000 8.192
Peak 8.192 0.000 8.192
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.7406 -28.9034 0.0359 0.3 73.7 0.1478 5.4 TRIG_00225393
------------------------------------------
Foreground time interval of the image:
0.000 8.192 (delta_t = 8.192 [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 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.31762 ( -0.898034 1.07522 )
Norm@50keV : 1.002850E-04 ( -1.002850E-04 1.510327E-04) )
------------------------------------------------------------
Chi-Squared = 61.01641 using 59 PHA bins.
Reduced chi-squared = 1.070463 for 57 degrees of freedom
Null hypothesis probability = 0.334
Photon flux (15-150 keV) in 8.192 sec: 0.210164 ( -0.046548 0.046701 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.38126e-08 ( -1.33334e-08 1.41542e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81000 ( )
Epeak [keV] : 0.989887 ( )
Norm@50keV : 0.124668 ( )
------------------------------------------------------------
Chi-Squared = 59.64004 using 59 PHA bins.
Reduced chi-squared = 1.065001 for 56 degrees of freedom
Null hypothesis probability = 0.345
Photon flux (15-150 keV) in 8.192 sec: 0.209957 ( -0.046528 0.046678 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.37915e-08 ( -1.33281e-08 1.41304e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.96017 ( -1.03983 5.96379 )
beta : -5.31765 ( -1.07676 0.898145 )
Epeak [keV] : 19.9887 ( -19.8887 9980.01 )
Norm@50keV : 1.362926E-02 ( -1.362926E-02 2.052832E-02) )
------------------------------------------------------------
Chi-Squared = 61.01642 using 59 PHA bins.
Reduced chi-squared = 1.109389 for 55 degrees of freedom
Null hypothesis probability = 0.269
Photon flux (15-150 keV) in 8.192 sec: 0.212714 ( -0.046362 0.044103 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4366e-08 ( -1.11318e-08 1.15214e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.31762 ( -0.898034 1.07522 )
Norm@50keV : 1.002850E-04 ( -1.002850E-04 1.510327E-04) )
------------------------------------------------------------
Chi-Squared = 61.01641 using 59 PHA bins.
Reduced chi-squared = 1.070463 for 57 degrees of freedom
Null hypothesis probability = 0.334
Photon flux (15-150 keV) in 8.192 sec: 0.210164 ( -0.046548 0.046701 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.38126e-08 ( -1.33334e-08 1.41542e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81000 ( )
Epeak [keV] : 0.989887 ( )
Norm@50keV : 0.124668 ( )
------------------------------------------------------------
Chi-Squared = 59.64004 using 59 PHA bins.
Reduced chi-squared = 1.065001 for 56 degrees of freedom
Null hypothesis probability = 0.345
Photon flux (15-150 keV) in 8.192 sec: 0.209957 ( -0.046528 0.046678 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.37915e-08 ( -1.33281e-08 1.41304e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.96017 ( -1.03983 2.60275 )
beta : -5.31765 ( -1.07676 0.898145 )
Epeak [keV] : 19.9887 ( -19.8887 9980.01 )
Norm@50keV : 1.362926E-02 ( -1.362926E-02 2.052832E-02) )
------------------------------------------------------------
Chi-Squared = 61.01642 using 59 PHA bins.
Reduced chi-squared = 1.109389 for 55 degrees of freedom
Null hypothesis probability = 0.269
Photon flux (15-150 keV) in 8.192 sec: 0.212714 ( -0.046362 0.044103 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4366e-08 ( -1.11318e-08 1.15214e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 01:31:32 EST 2008