batgrbproduct Analysis for Trigger=142554
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 Jan 7 10:59:52 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger142554/GCN5_download_cron
======================================================================
Trigger: 00142554 Segment: 000
BAT Trigger Time: 141253016 [s; MET]
Trigger Stop: 141253080 [s; MET]
UTC: 2005-06-23T20:56:56.412920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.7744715299 Dec: -27.3313056448819 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33351
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33351
Flight Position: [ source = BAT ]
RA: 266.7744715299 Dec: -27.3313056448819 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.701397101816 Dec: -27.3678457774042 [deg; J2000]
{ 17h 46m 48.3s , -27d 22' 04.2" }
+/- 3.53060347581598 [arcmin] (estimated 90% radius based on SNR)
+/- 1.78024281226455 [arcmin] (formal 1-sigma fit error)
SNR: 5.01738042145791
RA = 17h 46m 48.3s (266.701397 deg.)
Dec = -27d 22' 4" (-27.367846 deg.)
Angular difference between Flight and Ground position is 4.469091 arcmin
Partial Coding Fraction: 0.9609375 [ 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 0.213576 0.075743 0.032514 -0.006598
0.033138 0.027647 0.021895 0.017689 [error]
Peak 0.213576 0.075743 0.032514 -0.006598
0.033138 0.027647 0.021895 0.017689 [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 4.75e-08 4.34e-08 2.74e-08 2.65e-08 1.29e-07 1.44e-07 erg/cm2
Error 1.44e-08 1.34e-08 1.65e-08 3.12e-08 4.12e-08 5.82e-08 erg/cm2
Peak flux Power-law 4.75e-02 2.43e-02 7.65e-03 3.09e-03 8.11e-02 8.25e-02 ph/cm2/s
Error 1.47e-02 7.22e-03 4.46e-03 3.81e-03 2.09e-02 2.13e-02 ph/cm2/s
Fluence Cutoff-PL 4.75e-08 4.73e-08 2.00e-08 3.25e-09 1.17e-07 1.18e-07 erg/cm2
Error 1.21e-08 1.71e-08 2.16e-08 3.07e-08 4.62e-08 6.30e-08 erg/cm2
Peak flux Cutoff-PL 4.70e-02 2.65e-02 5.83e-03 5.01e-04 7.98e-02 7.99e-02 ph/cm2/s
Error 1.17e-02 8.87e-03 6.00e-03 3.41e-03 2.08e-02 1.57e-02 ph/cm2/s
Fluence Band 4.93e-08 4.56e-08 2.07e-08 1.30e-08 1.22e-07 1.29e-07 erg/cm2
Error 1.55e-08 1.44e-08 2.05e-08 1.29e-08 4.34e-08 5.12e-08 erg/cm2
Peak flux Band 4.75e-02 2.43e-02 7.65e-03 5.73e-04 7.98e-02 8.25e-02 ph/cm2/s
Error 1.47e-02 7.22e-03 4.46e-03 3.07e-03 2.08e-02 2.23e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.665 0.580 - - 3.72e-04 1.67e-04 62.025 57
CPL 1.619 2.752 11.4 20.6 1.93e-03 1.96e+00 61.359 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.665 0.580 - - 3.72e-04 1.67e-04 62.025 57
CPL 1.619 2.499 11.4 20.6 1.93e-03 1.96e+00 61.359 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
266.7014 -27.3678 0.0382 10.6 58.9 0.2789 5.0 TRIG_00142554
------------------------------------------
Foreground time interval of the image:
0.000 33.062 (delta_t = 33.062 [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 33.062 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66458 ( -0.525327 0.634392 )
Norm@50keV : 3.720715E-04 ( -1.640634E-04 1.708183E-04) )
------------------------------------------------------------
Chi-Squared = 62.02526 using 59 PHA bins.
Reduced chi-squared = 1.088162 for 57 degrees of freedom
Null hypothesis probability = 0.302
Photon flux (15-150 keV) in 33.06 sec: 8.113463E-02 ( -0.020864 0.0208694 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29317e-07 ( -3.9553e-08 4.28474e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.062 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61916 ( -4.61916 0.884449 )
Epeak [keV] : 11.4366 ( -11.4266 29.7816 )
Norm@50keV : 1.929391E-03 ( -1.929391E-03 3.91273 )
------------------------------------------------------------
Chi-Squared = 61.35948 using 59 PHA bins.
but latest trial 57.4594 gives Chi-Squared = 4.84887
Reduced chi-squared = 1.095705 for 56 degrees of freedom
Null hypothesis probability = 0.290
Photon flux (15-150 keV) in 33.06 sec: 7.982711E-02 ( -0.0206901 0.0208519 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17378e-07 ( -4.36118e-08 4.86961e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.062 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73675 ( -8.26325 0.845540 )
beta : -9.28044 ( -0.719563 7.10145 )
Epeak [keV] : 11.2789 ( -11.1789 21.6962 )
Norm@50keV : 1.341503E-03 ( -151.108 157.605 )
------------------------------------------------------------
Chi-Squared = 61.57730 using 59 PHA bins.
Reduced chi-squared = 1.119587 for 55 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 33.06 sec: 7.983083E-02 ( -0.0206821 0.0208702 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22444e-07 ( -4.02701e-08 4.64903e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.062 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66458 ( -0.525327 0.634392 )
Norm@50keV : 3.720715E-04 ( -1.640634E-04 1.708183E-04) )
------------------------------------------------------------
Chi-Squared = 62.02526 using 59 PHA bins.
Reduced chi-squared = 1.088162 for 57 degrees of freedom
Null hypothesis probability = 0.302
Photon flux (15-150 keV) in 33.06 sec: 8.113463E-02 ( -0.020864 0.0208694 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29317e-07 ( -3.9553e-08 4.28474e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.062 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61916 ( -4.61916 0.378458 )
Epeak [keV] : 11.4366 ( -11.4266 29.7816 )
Norm@50keV : 1.929391E-03 ( -1.929391E-03 3.91273 )
------------------------------------------------------------
Chi-Squared = 61.35948 using 59 PHA bins.
but latest trial 57.4594 gives Chi-Squared = 4.84887
Reduced chi-squared = 1.095705 for 56 degrees of freedom
Null hypothesis probability = 0.290
Photon flux (15-150 keV) in 33.06 sec: 7.982711E-02 ( -0.0206901 0.0208519 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17378e-07 ( -4.36118e-08 4.86961e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.062 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73675 ( -8.26325 0.845540 )
beta : -9.28044 ( -0.719563 7.10067 )
Epeak [keV] : 11.2789 ( -11.1789 21.6962 )
Norm@50keV : 1.341503E-03 ( -151.108 157.605 )
------------------------------------------------------------
Chi-Squared = 61.57730 using 59 PHA bins.
Reduced chi-squared = 1.119587 for 55 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 33.06 sec: 7.983083E-02 ( -0.0206821 0.0208702 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22444e-07 ( -4.02701e-08 4.64903e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 11:05:51 EST 2008