batgrbproduct Analysis for Trigger=202892
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 16:15:24 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger202892/GCN5_download_cron
======================================================================
Trigger: 00202892 Segment: 000
BAT Trigger Time: 165113552 [s; MET]
Trigger Stop: 165113616 [s; MET]
UTC: 2006-03-27T00:52:30.904720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 280.221047668402 Dec: -5.57037699036247 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.45
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.45
Flight Position: [ source = BAT ]
RA: 280.221047668402 Dec: -5.57037699036247 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.326290782865 Dec: -5.5123940380214 [deg; J2000]
{ 18h 41m 18.3s , -05d 30' 44.6" }
+/- 4.46051610634679 [arcmin] (estimated 90% radius based on SNR)
+/- 2.20931913887285 [arcmin] (formal 1-sigma fit error)
SNR: 3.59273647384771
RA = 18h 41m 18.3s (280.326291 deg.)
Dec = -5d 30' 45" (-5.512394 deg.)
Angular difference between Flight and Ground position is 7.183695 arcmin
Partial Coding Fraction: 0.921875 [ 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 0.100052 0.136607 -0.014769 -0.015897
0.032226 0.031589 0.027135 0.023737 [error]
Peak 0.100052 0.136607 -0.014769 -0.015897
0.032226 0.031589 0.027135 0.023737 [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 3.45e-08 3.65e-08 2.74e-08 3.33e-08 1.11e-07 1.31e-07 erg/cm2
Error 1.35e-08 1.46e-08 1.99e-08 5.16e-08 4.96e-08 7.95e-08 erg/cm2
Peak flux Power-law 3.42e-02 2.02e-02 7.57e-03 3.77e-03 6.40e-02 6.57e-02 ph/cm2/s
Error 1.37e-02 7.84e-03 5.34e-03 5.43e-03 2.22e-02 2.32e-02 ph/cm2/s
Fluence Cutoff-PL 3.24e-08 5.27e-08 8.94e-09 3.73e-11 9.40e-08 9.41e-08 erg/cm2
Error 1.42e-08 1.59e-08 1.52e-08 3.15e-09 3.28e-08 3.28e-08 erg/cm2
Peak flux Cutoff-PL 3.10e-02 2.95e-02 2.81e-03 6.15e-06 6.34e-02 6.34e-02 ph/cm2/s
Error 1.40e-02 1.09e-02 4.44e-03 4.79e-04 2.01e-02 2.00e-02 ph/cm2/s
Fluence Band 3.34e-08 4.52e-08 1.82e-08 2.31e-09 1.00e-07 1.01e-07 erg/cm2
Error 1.13e-08 1.65e-08 1.39e-08 6.42e-09 4.22e-08 5.03e-08 erg/cm2
Peak flux Band 3.26e-02 2.75e-02 4.49e-03 1.04e-04 6.47e-02 6.47e-02 ph/cm2/s
Error 1.70e-02 9.82e-03 5.21e-03 1.98e-03 2.12e-02 2.24e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.415 0.708 - - 3.43e-04 2.68e-04 49.485 57
CPL -2.499 0.000 29.5 7.1 6.56e-01 2.25e+00 45.199 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.415 0.708 - - 3.43e-04 2.68e-04 49.485 57
CPL -2.499 0.000 29.5 7.1 6.56e-01 2.25e+00 45.199 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 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
280.3263 -5.5124 0.0534 16.1 33.6 0.2360 3.6 TRIG_00202892
------------------------------------------
Foreground time interval of the image:
0.000 33.103 (delta_t = 33.103 [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 33.103 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41503 ( -0.618832 0.797754 )
Norm@50keV : 3.428575E-04 ( -3.428575E-04 1.931052E-04) )
------------------------------------------------------------
Chi-Squared = 49.48506 using 59 PHA bins.
Reduced chi-squared = 0.8681590 for 57 degrees of freedom
Null hypothesis probability = 0.750
Photon flux (15-150 keV) in 33.10 sec: 6.399005E-02 ( -0.022103 0.0222478 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11082e-07 ( -4.63519e-08 5.28561e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.103 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49902 ( )
Epeak [keV] : 29.4894 ( -6.45693 7.67130 )
Norm@50keV : 0.656157 ( -1.34698 3.14672 )
------------------------------------------------------------
Chi-Squared = 45.19912 using 59 PHA bins.
Reduced chi-squared = 0.8071272 for 56 degrees of freedom
Null hypothesis probability = 0.849
Photon flux (15-150 keV) in 33.10 sec: 6.338313E-02 ( -0.0200216 0.0201468 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.40268e-08 ( -3.13325e-08 3.4231e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.103 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.664954 ( -13.5527 0.220521 )
beta : -8.44603 ( -1.56343 18.4365 )
Epeak [keV] : 26.3928 ( -12.6875 90.5496 )
Norm@50keV : 5.326642E-03 ( -3.07705 19.7175 )
------------------------------------------------------------
Chi-Squared = 47.28901 using 59 PHA bins.
Reduced chi-squared = 0.8598002 for 55 degrees of freedom
Null hypothesis probability = 0.761
Photon flux (15-150 keV) in 33.10 sec: 6.469955E-02 ( -0.0216601 0.020765 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00139e-07 ( -3.57629e-08 4.86861e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.103 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41503 ( -0.618832 0.797754 )
Norm@50keV : 3.428575E-04 ( -3.428575E-04 1.931052E-04) )
------------------------------------------------------------
Chi-Squared = 49.48506 using 59 PHA bins.
Reduced chi-squared = 0.8681590 for 57 degrees of freedom
Null hypothesis probability = 0.750
Photon flux (15-150 keV) in 33.10 sec: 6.399005E-02 ( -0.022103 0.0222478 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11082e-07 ( -4.63519e-08 5.28561e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.103 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49902 ( )
Epeak [keV] : 29.4894 ( -6.45693 7.67130 )
Norm@50keV : 0.656157 ( -1.34698 3.14672 )
------------------------------------------------------------
Chi-Squared = 45.19912 using 59 PHA bins.
Reduced chi-squared = 0.8071272 for 56 degrees of freedom
Null hypothesis probability = 0.849
Photon flux (15-150 keV) in 33.10 sec: 6.338313E-02 ( -0.0200216 0.0201468 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.40268e-08 ( -3.13325e-08 3.4231e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.103 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.664954 ( -13.6342 0.220521 )
beta : -8.44603 ( -1.56343 18.4365 )
Epeak [keV] : 26.3928 ( -12.7242 90.5496 )
Norm@50keV : 5.326642E-03 ( -3.07705 19.7175 )
------------------------------------------------------------
Chi-Squared = 47.28901 using 59 PHA bins.
Reduced chi-squared = 0.8598002 for 55 degrees of freedom
Null hypothesis probability = 0.761
Photon flux (15-150 keV) in 33.10 sec: 6.469955E-02 ( -0.0216601 0.020765 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00139e-07 ( -3.57629e-08 4.86861e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 16:26:15 EST 2007