batgrbproduct Analysis for Trigger=179811
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 10:18:38 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger179811/GCN5_download_cron
======================================================================
Trigger: 00179811 Segment: 000
BAT Trigger Time: 160466800 [s; MET]
Trigger Stop: 160466888 [s; MET]
UTC: 2006-02-01T06:06:39.010640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 265.351398014353 Dec: -28.2194826052862 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.4
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.4
Flight Position: [ source = BAT ]
RA: 265.351398014353 Dec: -28.2194826052862 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 265.371807298638 Dec: -28.242053809598 [deg; J2000]
{ 17h 41m 29.2s , -28d 14' 31.4" }
+/- 5.00647778154172 [arcmin] (estimated 90% radius based on SNR)
+/- 2.87289645928491 [arcmin] (formal 1-sigma fit error)
SNR: 3.04639723590669
RA = 17h 41m 29.2s (265.371807 deg.)
Dec = -28d 14' 31" (-28.242054 deg.)
Angular difference between Flight and Ground position is 1.731493 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 88 +/-
Measured from: 0
to: 88 [s; relative to TRIGTIME]
T50: 88 +/-
Measured from: 0
to: 88 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 88 second)
Measured from: 0
to: 88 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 88 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.110067 0.089004 -0.011961 0.001427
0.034542 0.028696 0.023485 0.020366 [error]
Peak 0.110067 0.089004 -0.011961 0.001427
0.034542 0.028696 0.023485 0.020366 [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 4.44e-08 2.45e-08 8.46e-09 3.82e-09 7.94e-08 8.13e-08 erg/cm2
Error 1.55e-08 1.42e-08 1.11e-08 1.02e-08 3.47e-08 3.88e-08 erg/cm2
Peak flux Power-law 4.52e-02 1.41e-02 2.44e-03 4.90e-04 6.20e-02 6.22e-02 ph/cm2/s
Error 1.60e-02 7.85e-03 3.10e-03 1.20e-03 2.16e-02 2.18e-02 ph/cm2/s
Fluence Cutoff-PL 4.54e-08 2.79e-08 2.95e-09 2.61e-11 7.63e-08 7.63e-08 erg/cm2
Error 1.68e-08 1.82e-08 9.50e-09 3.15e-09 3.01e-08 2.22e-08 erg/cm2
Peak flux Cutoff-PL 4.51e-02 1.41e-02 2.44e-03 4.86e-04 6.20e-02 6.22e-02 ph/cm2/s
Error 1.60e-02 7.86e-03 3.10e-03 1.19e-03 2.16e-02 2.18e-02 ph/cm2/s
Fluence Band 4.40e-08 2.41e-08 8.26e-09 3.68e-09 7.87e-08 7.60e-08 erg/cm2
Error 1.52e-08 1.14e-08 1.37e-08 9.17e-09 3.05e-08 2.87e-08 erg/cm2
Peak flux Band 4.51e-02 1.41e-02 2.44e-03 1.69e-05 6.29e-02 6.22e-02 ph/cm2/s
Error 1.60e-02 7.86e-03 8.85e-04 2.09e-02 2.18e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.428 1.085 - - 1.64e-04 1.56e-04 62.078 57
CPL 0.874 4.403 11.8 12.5 1.25e-02 2.74e+00 61.102 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.428 1.085 - - 1.64e-04 1.56e-04 62.078 57
CPL 0.874 2.494 11.8 12.5 1.25e-02 2.74e+00 61.102 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 88.000 0.000 88.000
T90 88.000 0.000 88.000
T50 88.000 0.000 88.000
Peak 88.000 0.000 88.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
265.3718 -28.2421 0.0628 13.3 -15.2 0.1923 3.0 TRIG_00179811
------------------------------------------
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: 3.42801 ( -0.758646 1.41103 )
Norm@50keV : 1.637842E-04 ( -1.637842E-04 1.475022E-04) )
------------------------------------------------------------
Chi-Squared = 62.07844 using 59 PHA bins.
Reduced chi-squared = 1.089095 for 57 degrees of freedom
Null hypothesis probability = 0.300
Photon flux (15-150 keV) in 33.10 sec: 6.204959E-02 ( -0.021546 0.0216947 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.94185e-08 ( -3.23225e-08 3.71465e-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: 0.873654 ( -3.87365 4.93331 )
Epeak [keV] : 11.8254 ( -11.8154 13.2063 )
Norm@50keV : 1.254566E-02 ( -1.254566E-02 5.46951 )
------------------------------------------------------------
Chi-Squared = 61.10184 using 59 PHA bins.
Reduced chi-squared = 1.091104 for 56 degrees of freedom
Null hypothesis probability = 0.298
Photon flux (15-150 keV) in 33.10 sec: 6.202350E-02 ( -0.0215407 0.0216867 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62849e-08 ( -2.79122e-08 3.22295e-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 : -7.66736 ( -0.235521 0.514488 )
beta : -3.53328 ( -0.629591 6.55163 )
Epeak [keV] : 38.2030 ( -5.52646 20.1846 )
Norm@50keV : 2.029269E-02 ( -2.594803E-02 230.469 )
------------------------------------------------------------
Chi-Squared = 62.04818 using 59 PHA bins.
Reduced chi-squared = 1.128149 for 55 degrees of freedom
Null hypothesis probability = 0.239
Photon flux (15-150 keV) in 33.10 sec: 6.292982E-02 ( -0.0209732 0.0209173 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.87002e-08 ( -2.66756e-08 3.42572e-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: 3.42801 ( -0.758646 1.41103 )
Norm@50keV : 1.637842E-04 ( -1.637842E-04 1.475022E-04) )
------------------------------------------------------------
Chi-Squared = 62.07844 using 59 PHA bins.
Reduced chi-squared = 1.089095 for 57 degrees of freedom
Null hypothesis probability = 0.300
Photon flux (15-150 keV) in 33.10 sec: 6.204959E-02 ( -0.021546 0.0216947 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.94185e-08 ( -3.23225e-08 3.71465e-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: 0.873654 ( -3.87365 1.11427 )
Epeak [keV] : 11.8254 ( -11.8154 13.2063 )
Norm@50keV : 1.254566E-02 ( -1.254566E-02 5.46951 )
------------------------------------------------------------
Chi-Squared = 61.10184 using 59 PHA bins.
Reduced chi-squared = 1.091104 for 56 degrees of freedom
Null hypothesis probability = 0.298
Photon flux (15-150 keV) in 33.10 sec: 6.202350E-02 ( -0.0215407 0.0216867 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62849e-08 ( -2.79122e-08 3.22295e-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 : -7.66736 ( -0.235521 0.514488 )
beta : -3.53328 ( -0.629591 6.55163 )
Epeak [keV] : 38.2030 ( -5.52646 20.1846 )
Norm@50keV : 2.029269E-02 ( -2.594803E-02 230.469 )
------------------------------------------------------------
Chi-Squared = 62.04818 using 59 PHA bins.
Reduced chi-squared = 1.128149 for 55 degrees of freedom
Null hypothesis probability = 0.239
Photon flux (15-150 keV) in 33.10 sec: 6.292982E-02 ( -0.0209732 0.0209173 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.87002e-08 ( -2.66756e-08 3.42572e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 10:23:52 EST 2007