batgrbproduct Analysis for Trigger=228568
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 03:47:19 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger228568/GCN5_download_cron
======================================================================
Trigger: 00228568 Segment: 000
BAT Trigger Time: 179388248 [s; MET]
Trigger Stop: 179388312 [s; MET]
UTC: 2006-09-08T06:04:06.569180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 106.612033475865 Dec: -49.0854923574777 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.21
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.21
Flight Position: [ source = BAT ]
RA: 106.612033475865 Dec: -49.0854923574777 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 106.827585456425 Dec: -49.1755720457545 [deg; J2000]
{ 07h 07m 18.6s , -49d 10' 32.1" }
+/- 4.6797457948435 [arcmin] (estimated 90% radius based on SNR)
+/- 3.13374441806003 [arcmin] (formal 1-sigma fit error)
SNR: 3.35473333900855
RA = 7h 7m 18.6s (106.827585 deg.)
Dec = -49d 10' 32" (-49.175572 deg.)
Angular difference between Flight and Ground position is 10.041297 arcmin
Partial Coding Fraction: 0.9921875 [ 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 0.053043 0.090266 0.036008 0.015506
0.027537 0.026103 0.022052 0.019252 [error]
Peak 0.053043 0.090266 0.036008 0.015506
0.027537 0.026103 0.022052 0.019252 [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 1.26e-08 2.72e-08 4.62e-08 1.80e-07 1.27e-07 2.67e-07 erg/cm2
Error 8.97e-09 1.21e-08 2.07e-08 1.81e-07 5.27e-08 2.11e-07 erg/cm2
Peak flux Power-law 1.22e-02 1.44e-02 1.22e-02 1.75e-02 4.50e-02 5.63e-02 ph/cm2/s
Error 8.84e-03 6.56e-03 5.32e-03 1.74e-02 1.79e-02 2.23e-02 ph/cm2/s
Fluence Cutoff-PL 1.17e-08 2.99e-08 4.73e-08 5.93e-08 1.18e-07 1.35e-07 erg/cm2
Error 9.50e-09 2.24e-08 3.57e-08 2.19e-07 8.90e-08 2.35e-07 erg/cm2
Peak flux Cutoff-PL 1.12e-02 1.57e-02 1.27e-02 7.41e-03 4.41e-02 4.71e-02 ph/cm2/s
Error 1.08e-02 1.00e-02 9.47e-03 1.97e-02 2.30e-02 2.69e-02 ph/cm2/s
Fluence Band 1.01e-08 3.48e-08 4.18e-08 6.95e-08 1.11e-07 1.90e-07 erg/cm2
Error 1.76e-08 2.35e-08 1.80e-07 5.55e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.00e-02 1.79e-02 1.18e-02 1.17e-02 4.47e-02 5.08e-02 ph/cm2/s
Error 1.08e-02 7.68e-03 5.40e-03 1.53e-02 1.88e-02 2.34e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.239 0.709 - - 3.82e-04 1.46e-04 51.539 57
CPL 0.341 2.435 85.1 5000.0 1.18e-03 3.09e-02 51.381 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.239 0.709 - - 3.82e-04 1.46e-04 51.539 57
CPL 0.341 2.435 85.1 5000.0 1.18e-03 3.09e-02 51.381 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
106.8276 -49.1756 0.0571 14.7 -137.7 0.1728 3.4 TRIG_00228568
------------------------------------------
Foreground time interval of the image:
0.000 33.095 (delta_t = 33.095 [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 33.095 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23899 ( -0.755900 0.662267 )
Norm@50keV : 3.815476E-04 ( -1.459791E-04 1.459372E-04) )
------------------------------------------------------------
Chi-Squared = 51.53892 using 59 PHA bins.
Reduced chi-squared = 0.9041916 for 57 degrees of freedom
Null hypothesis probability = 0.679
Photon flux (15-150 keV) in 33.09 sec: 4.504592E-02 ( -0.0178075 0.0180239 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26748e-07 ( -5.18252e-08 5.35519e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.095 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.341180 ( -3.34118 1.52978 )
Epeak [keV] : 85.0674 ( -85.0574 9914.93 )
Norm@50keV : 1.175405E-03 ( -1.175405E-03 6.055489E-02) )
------------------------------------------------------------
Chi-Squared = 51.38134 using 59 PHA bins.
but latest trial 0.107649 gives Chi-Squared = 10.2579
Reduced chi-squared = 0.9175239 for 56 degrees of freedom
Null hypothesis probability = 0.650
Photon flux (15-150 keV) in 33.09 sec: 4.406871E-02 ( -0.0276301 0.018394 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17566e-07 ( -1.17566e-07 6.04061e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.163417 ( -14.7795 0.220520 )
beta : -1.60597 ( -7.73733 1.48567 )
Epeak [keV] : 66.7848 ( -44.4230 543.534 )
Norm@50keV : 1.694461E-03 ( -0.319454 1.22227 )
------------------------------------------------------------
Chi-Squared = 50.86034 using 59 PHA bins.
Reduced chi-squared = 0.9247335 for 55 degrees of freedom
Null hypothesis probability = 0.633
Photon flux (15-150 keV) in 33.09 sec: 4.466653E-02 ( -0.0194972 0.0181482 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11363e-07 ( -4.98014e-08 6.11225e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23899 ( -0.755900 0.662267 )
Norm@50keV : 3.815476E-04 ( -1.459791E-04 1.459372E-04) )
------------------------------------------------------------
Chi-Squared = 51.53892 using 59 PHA bins.
Reduced chi-squared = 0.9041916 for 57 degrees of freedom
Null hypothesis probability = 0.679
Photon flux (15-150 keV) in 33.09 sec: 4.504592E-02 ( -0.0178075 0.0180239 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26748e-07 ( -5.18252e-08 5.35519e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.095 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.341180 ( -3.34118 1.52978 )
Epeak [keV] : 85.0674 ( -85.0574 9914.93 )
Norm@50keV : 1.175405E-03 ( -1.175405E-03 6.055489E-02) )
------------------------------------------------------------
Chi-Squared = 51.38134 using 59 PHA bins.
but latest trial 0.107649 gives Chi-Squared = 10.2579
Reduced chi-squared = 0.9175239 for 56 degrees of freedom
Null hypothesis probability = 0.650
Photon flux (15-150 keV) in 33.09 sec: 4.406871E-02 ( -0.0276301 0.018394 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17566e-07 ( -1.17566e-07 6.04061e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.163417 ( -14.7795 0.220520 )
beta : -1.60597 ( -7.73733 1.48567 )
Epeak [keV] : 66.7848 ( -44.4230 543.534 )
Norm@50keV : 1.694461E-03 ( -0.319454 1.22227 )
------------------------------------------------------------
Chi-Squared = 50.86034 using 59 PHA bins.
Reduced chi-squared = 0.9247335 for 55 degrees of freedom
Null hypothesis probability = 0.633
Photon flux (15-150 keV) in 33.09 sec: 4.466653E-02 ( -0.0194972 0.0181482 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11363e-07 ( -4.98014e-08 6.11225e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 03:53:19 EST 2008