batgrbproduct Analysis for Trigger=141076
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 10:41:13 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger141076/SDC
======================================================================
Trigger: 00141076 Segment: 000
BAT Trigger Time: 140458577.792 [s; MET]
Trigger Stop: 140458594.176 [s; MET]
UTC: 2005-06-14T16:16:18.219780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.239366844296 Dec: -40.4611923748861 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.46
Image Trigger?: NO
Rate S/N Ratio: 8.06225774829855 [ if not an image trigger ]
Image S/N Ratio: 12.46
Flight Position: [ source = BAT ]
RA: 135.239366844296 Dec: -40.4611923748861 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.191896429573 Dec: -40.529887142889 [deg; J2000]
{ 09h 00m 46.1s , -40d 31' 47.6" }
+/- 2.08004559832893 [arcmin] (estimated 90% radius based on SNR)
+/- 1.26027730356806 [arcmin] (formal 1-sigma fit error)
SNR: 10.6838697874382
RA = 9h 0m 46.1s (135.191896 deg.)
Dec = -40d 31' 48" (-40.529887 deg.)
Angular difference between Flight and Ground position is 4.656140 arcmin
Partial Coding Fraction: 0.2695312 [ including projection effects ]
Duration
T90: 16.3840000033379 +/-
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
T50: 16.3840000033379 +/-
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 16.3840000033379 second)
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.246658 0.256552 0.025818 0.001228
0.036701 0.039815 0.037993 0.041335 [error]
Peak 0.246658 0.256552 0.025818 0.001228
0.036701 0.039815 0.037993 0.041335 [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 1.02e-07 1.06e-07 7.81e-08 9.24e-08 3.23e-07 3.79e-07 erg/cm2
Error 2.33e-08 2.26e-08 3.16e-08 7.04e-08 7.60e-08 1.17e-07 erg/cm2
Peak flux Power-law 2.06e-01 1.19e-01 4.37e-02 2.12e-02 3.80e-01 3.90e-01 ph/cm2/s
Error 4.77e-02 2.45e-02 1.71e-02 1.51e-02 7.14e-02 7.40e-02 ph/cm2/s
Fluence Cutoff-PL 9.43e-08 1.34e-07 4.18e-08 1.40e-09 2.72e-07 2.73e-07 erg/cm2
Error 2.73e-08 3.32e-08 4.39e-08 1.85e-08 6.49e-08 6.69e-08 erg/cm2
Peak flux Cutoff-PL 1.85e-01 1.51e-01 2.58e-02 4.75e-04 3.62e-01 3.62e-01 ph/cm2/s
Error 5.63e-02 3.64e-02 2.08e-02 5.13e-03 7.06e-02 7.07e-02 ph/cm2/s
Fluence Band 9.23e-08 1.36e-07 3.52e-08 3.32e-09 2.67e-07 2.87e-07 erg/cm2
Error 2.75e-08 3.23e-08 3.29e-08 3.39e-08 6.72e-08 8.80e-08 erg/cm2
Peak flux Band 1.86e-01 1.51e-01 2.59e-02 1.78e-03 3.63e-01 3.65e-01 ph/cm2/s
Error 6.71e-02 3.43e-02 8.79e-03 1.00e-02 6.86e-02 6.92e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.445 0.389 - - 2.00e-03 6.00e-04 54.573 57
CPL -0.086 2.488 27.7 17.7 8.94e-02 1.47e+00 50.182 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.445 0.389 - - 2.00e-03 6.00e-04 54.573 57
CPL -0.086 2.488 27.7 17.7 8.94e-02 1.47e+00 50.182 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 16.384 0.000 16.384
T90 16.384 0.000 16.384
T50 16.384 0.000 16.384
Peak 16.384 0.000 16.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.1919 -40.5299 0.0179 50.3 -12.9 0.9354 10.7 TRIG_00141076
------------------------------------------
Foreground time interval of the image:
0.000 16.384 (delta_t = 16.384 [sec])
Background time interval of the image:
-299.792 -33.792 (delta_t = 266.000 [sec])
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 16.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.44546 ( -0.361393 0.416867 )
Norm@50keV : 1.996197E-03 ( -6.000885E-04 6.008376E-04) )
------------------------------------------------------------
Chi-Squared = 54.57271 using 59 PHA bins.
Reduced chi-squared = 0.9574159 for 57 degrees of freedom
Null hypothesis probability = 0.567
Photon flux (15-150 keV) in 16.38 sec: 0.379569 ( -0.071403 0.071422 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22565e-07 ( -7.38509e-08 7.81998e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 16.384 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.558212E-02 ( -2.91442 2.06088 )
Epeak [keV] : 27.7431 ( -27.7331 7.69929 )
Norm@50keV : 8.939181E-02 ( -8.939181E-02 2.84237 )
------------------------------------------------------------
Chi-Squared = 50.18230 using 59 PHA bins.
but latest trial 4.39691 gives Chi-Squared = 5.51122
Reduced chi-squared = 0.8961126 for 56 degrees of freedom
Null hypothesis probability = 0.694
Photon flux (15-150 keV) in 16.38 sec: 0.361879 ( -0.070293 0.070946 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71897e-07 ( -5.80622e-08 7.16985e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.833157 ( -0.952728 5.73736 )
beta : -4.33779 ( -5.66221 13.2941 )
Epeak [keV] : 25.3683 ( -10.9421 57.2418 )
Norm@50keV : 2.169105E-02 ( -0.288733 19.3685 )
------------------------------------------------------------
Chi-Squared = 50.78141 using 59 PHA bins.
Reduced chi-squared = 0.9232984 for 55 degrees of freedom
Null hypothesis probability = 0.636
Photon flux (15-150 keV) in 16.38 sec: 0.362828 ( -0.069054 0.068128 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6668e-07 ( -5.29533e-08 8.13644e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.44546 ( -0.361393 0.416867 )
Norm@50keV : 1.996197E-03 ( -6.000885E-04 6.008376E-04) )
------------------------------------------------------------
Chi-Squared = 54.57271 using 59 PHA bins.
Reduced chi-squared = 0.9574159 for 57 degrees of freedom
Null hypothesis probability = 0.567
Photon flux (15-150 keV) in 16.38 sec: 0.379569 ( -0.071403 0.071422 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22565e-07 ( -7.38509e-08 7.81998e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 16.384 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.558212E-02 ( -2.91442 2.06088 )
Epeak [keV] : 27.7431 ( -27.7331 7.69929 )
Norm@50keV : 8.939181E-02 ( -8.939181E-02 2.84237 )
------------------------------------------------------------
Chi-Squared = 50.18230 using 59 PHA bins.
but latest trial 4.39691 gives Chi-Squared = 5.51122
Reduced chi-squared = 0.8961126 for 56 degrees of freedom
Null hypothesis probability = 0.694
Photon flux (15-150 keV) in 16.38 sec: 0.361879 ( -0.070293 0.070946 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71897e-07 ( -5.80622e-08 7.16985e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.833157 ( -6.61158 5.73736 )
beta : -4.33779 ( -5.66221 13.2941 )
Epeak [keV] : 25.3683 ( -25.2683 57.2418 )
Norm@50keV : 2.169105E-02 ( -0.288733 19.3685 )
------------------------------------------------------------
Chi-Squared = 50.78141 using 59 PHA bins.
Reduced chi-squared = 0.9232984 for 55 degrees of freedom
Null hypothesis probability = 0.636
Photon flux (15-150 keV) in 16.38 sec: 0.362828 ( -0.069054 0.068128 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6668e-07 ( -5.29533e-08 8.13644e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 10:58:29 EST 2008