batgrbproduct Analysis for Trigger=203045
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): Mon Dec 31 16:33:25 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger203045/GCN5_download_cron
======================================================================
Trigger: 00203045 Segment: 000
BAT Trigger Time: 165246616 [s; MET]
Trigger Stop: 165246680 [s; MET]
UTC: 2006-03-28T13:50:14.901620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.620837332719 Dec: -28.7070675090197 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.07
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.07
Flight Position: [ source = BAT ]
RA: 266.620837332719 Dec: -28.7070675090197 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.708089280135 Dec: -28.7869364358888 [deg; J2000]
{ 17h 46m 49.9s , -28d 47' 13.0" }
+/- 5.96968786938501 [arcmin] (estimated 90% radius based on SNR)
+/- 4.13234705895329 [arcmin] (formal 1-sigma fit error)
SNR: 2.36927820650074
RA = 17h 46m 49.9s (266.708089 deg.)
Dec = -28d 47' 13" (-28.786936 deg.)
Angular difference between Flight and Ground position is 6.635641 arcmin
Partial Coding Fraction: 0.90625 [ 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 0.115630 0.038269 -0.003661 0.025478
0.036039 0.032801 0.028008 0.024611 [error]
Peak 0.115630 0.038269 -0.003661 0.025478
0.036039 0.032801 0.028008 0.024611 [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 2.97e-08 1.92e-08 8.05e-09 4.59e-09 5.92e-08 6.15e-08 erg/cm2
Error 2.30e-08 1.67e-08 1.56e-08 2.87e-08 4.52e-08 6.05e-08 erg/cm2
Peak flux Power-law 3.00e-02 1.10e-02 2.29e-03 5.71e-04 4.37e-02 4.39e-02 ph/cm2/s
Error 2.34e-02 9.14e-03 4.27e-03 3.06e-03 2.43e-02 2.47e-02 ph/cm2/s
Fluence Cutoff-PL 2.98e-08 1.91e-08 7.34e-09 2.87e-09 5.81e-08 5.95e-08 erg/cm2
Error 1.92e-08 2.33e-08 1.56e-08 2.84e-08 4.45e-08 6.10e-08 erg/cm2
Peak flux Cutoff-PL 3.00e-02 1.10e-02 2.29e-03 5.66e-04 4.36e-02 4.38e-02 ph/cm2/s
Error 2.34e-02 9.15e-03 4.27e-03 3.04e-03 2.43e-02 2.47e-02 ph/cm2/s
Fluence Band 3.04e-08 1.82e-08 6.03e-09 1.61e-09 5.52e-08 9.87e-08 erg/cm2
Error 1.59e-08 1.77e-08 1.28e-08 4.06e-08 5.65e-08 0.00e+00 erg/cm2
Peak flux Band 3.01e-02 1.10e-02 2.12e-03 3.81e-04 4.35e-02 4.36e-02 ph/cm2/s
Error 1.77e-02 1.00e-02 4.27e-03 3.05e-03 1.85e-02 2.48e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.091 1.959 - - 1.51e-04 1.79e-04 39.877 57
CPL 1.717 3.883 4.1 0.0 2.29e-03 1.79e-04 39.930 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.091 1.959 - - 1.51e-04 1.79e-04 39.877 57
CPL 1.717 0.000 4.1 0.0 2.29e-03 1.78e-04 39.930 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
266.7081 -28.7869 0.0806 22.1 9.7 0.1493 2.4 TRIG_00203045
------------------------------------------
Foreground time interval of the image:
0.000 33.069 (delta_t = 33.069 [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 33.069 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.09114 ( -1.20704 2.71042 )
Norm@50keV : 1.506947E-04 ( -1.506947E-04 2.068421E-04) )
------------------------------------------------------------
Chi-Squared = 39.87713 using 59 PHA bins.
Reduced chi-squared = 0.6995988 for 57 degrees of freedom
Null hypothesis probability = 0.959
Photon flux (15-150 keV) in 33.07 sec: 4.365825E-02 ( -0.0241263 0.024492 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91662e-08 ( -3.7886e-08 5.24999e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.069 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71671 ( -2.87300 4.89280 )
Epeak [keV] : 4.06563 ( )
Norm@50keV : 2.286860E-03 ( -1.246135E-04 2.329578E-04) )
------------------------------------------------------------
Chi-Squared = 39.93016 using 59 PHA bins.
but latest trial -1.15304 gives Chi-Squared = 5.290222E-02
Reduced chi-squared = 0.7130385 for 56 degrees of freedom
Null hypothesis probability = 0.948
Photon flux (15-150 keV) in 33.07 sec: 4.363737E-02 ( -0.0241217 0.0244843 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.8107e-08 ( -3.55704e-08 5.35231e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.069 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50955 ( -7.28889 7.71111 )
beta : -8.71378 ( -2.52288 13.2568 )
Epeak [keV] : 8.08169 ( -7.98169 9991.92 )
Norm@50keV : 2.280206E-03 ( -1.779004E-02 3.061687E-02) )
------------------------------------------------------------
Chi-Squared = 40.00295 using 59 PHA bins.
Reduced chi-squared = 0.7273263 for 55 degrees of freedom
Null hypothesis probability = 0.936
Photon flux (15-150 keV) in 33.07 sec: 4.351266E-02 ( -0.0123225 0.0245816 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52411e-08 ( -3.04008e-08 5.08534e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.069 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.09114 ( -1.20704 2.71042 )
Norm@50keV : 1.506947E-04 ( -1.506947E-04 2.068421E-04) )
------------------------------------------------------------
Chi-Squared = 39.87713 using 59 PHA bins.
Reduced chi-squared = 0.6995988 for 57 degrees of freedom
Null hypothesis probability = 0.959
Photon flux (15-150 keV) in 33.07 sec: 4.365825E-02 ( -0.0241263 0.024492 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91662e-08 ( -3.7886e-08 5.24999e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.069 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71671 ( )
Epeak [keV] : 4.06563 ( )
Norm@50keV : 2.286860E-03 ( -1.190101E-04 2.369880E-04) )
------------------------------------------------------------
Chi-Squared = 39.93016 using 59 PHA bins.
but latest trial -1.15304 gives Chi-Squared = 5.290222E-02
Reduced chi-squared = 0.7130385 for 56 degrees of freedom
Null hypothesis probability = 0.948
Photon flux (15-150 keV) in 33.07 sec: 4.363737E-02 ( -0.0241217 0.0244843 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.8107e-08 ( -3.55704e-08 5.35231e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.069 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50955 ( -7.28889 7.71111 )
beta : -8.71378 ( -2.52288 13.2568 )
Epeak [keV] : 8.08169 ( -7.98169 9991.92 )
Norm@50keV : 2.280206E-03 ( -1.779004E-02 3.061687E-02) )
------------------------------------------------------------
Chi-Squared = 40.00295 using 59 PHA bins.
Reduced chi-squared = 0.7273263 for 55 degrees of freedom
Null hypothesis probability = 0.936
Photon flux (15-150 keV) in 33.07 sec: 4.351266E-02 ( -0.0123225 0.0245816 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52411e-08 ( -3.04008e-08 5.08534e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 16:41:53 EST 2007