batgrbproduct Analysis for Trigger=150314
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): Tue Jan 8 16:13:04 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger150314/SDC
======================================================================
Trigger: 00150314 Segment: 000
BAT Trigger Time: 145712336.64 [s; MET]
Trigger Stop: 145712353.024 [s; MET]
UTC: 2005-08-14T11:38:56.966000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.203808814218 Dec: 46.3327854969257 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.81
Image Trigger?: NO
Rate S/N Ratio: 9.1104335791443 [ if not an image trigger ]
Image S/N Ratio: 6.81
Flight Position: [ source = BAT ]
RA: 264.203808814218 Dec: 46.3327854969257 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.195046438625 Dec: 46.3325003103753 [deg; J2000]
{ 17h 36m 46.8s , +46d 19' 57.0" }
+/- 2.03280682803275 [arcmin] (estimated 90% radius based on SNR)
+/- 0.909025397652947 [arcmin] (formal 1-sigma fit error)
SNR: 11.0403051890822
RA = 17h 36m 46.8s (264.195046 deg.)
Dec = 46d 19' 57" (46.332500 deg.)
Angular difference between Flight and Ground position is 0.363413 arcmin
Partial Coding Fraction: 0.2617188 [ including projection effects ]
Duration
T90: 153.995999991894 +/- 42.786277159289
Measured from: -10.1079999804497
to: 143.888000011444 [s; relative to TRIGTIME]
T50: 55.9320000112057 +/- 18.5383360641024
Measured from: 9.5120000243187
to: 65.4440000355244 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.73600000143051
to: 9.73600000143051 [s; relative to TRIGTIME]
Total Fluence
Measured from: -19.8519999980927
to: 175.460000008345 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.063285 1.291207 0.787780 0.123404
0.104841 0.107039 0.095110 0.087346 [error]
Peak 0.018080 0.025275 0.036324 0.004007
0.009866 0.009958 0.008804 0.007617 [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 3.86e-07 5.81e-07 6.54e-07 1.40e-06 2.04e-06 3.01e-06 erg/cm2
Error 5.76e-08 5.56e-08 9.48e-08 4.16e-07 2.22e-07 5.05e-07 erg/cm2
Peak flux Power-law 1.87e-01 2.24e-01 1.94e-01 2.87e-01 7.07e-01 8.92e-01 ph/cm2/s
Error 1.17e-01 9.10e-02 6.76e-02 2.01e-01 2.50e-01 2.97e-01 ph/cm2/s
Fluence Cutoff-PL 3.65e-07 6.15e-07 6.61e-07 6.69e-07 1.96e-06 2.30e-06 erg/cm2
Error 6.60e-08 5.63e-08 1.03e-07 7.20e-07 2.47e-07 7.79e-07 erg/cm2
Peak flux Cutoff-PL 6.72e-02 2.47e-01 2.64e-01 4.51e-02 6.19e-01 6.22e-01 ph/cm2/s
Error 6.85e-02 1.13e-01 9.35e-02 1.09e-01 2.29e-01 2.41e-01 ph/cm2/s
Fluence Band 3.60e-07 6.15e-07 6.48e-07 9.58e-07 1.96e-06 2.52e-06 erg/cm2
Error 6.67e-08 7.99e-08 1.14e-07 2.17e-07 6.03e-07 0.00e+00 erg/cm2
Peak flux Band 8.13e-02 2.48e-01 2.61e-01 5.36e-02 6.33e-01 6.56e-01 ph/cm2/s
Error 6.34e-02 7.69e-02 8.26e-02 1.05e-01 2.00e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.829 0.174 - - 1.14e-03 1.21e-04 65.992 57
CPL 1.189 0.000 58.0 4977.8 2.50e-03 2.30e-03 64.725 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.210 0.532 - - 6.01e-03 2.02e-03 67.830 57
CPL -2.499 1.925 68.8 62.5 2.47e-01 1.75e-01 64.094 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 195.312 -19.852 175.460
T90 153.996 -10.108 143.888
T50 55.932 9.512 65.444
Peak 1.000 8.736 9.736
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.1950 +46.3325 0.0174 39.7 36.9 2.2576 11.0 TRIG_00150314
------------------------------------------
Foreground time interval of the image:
-19.852 68.765 (delta_t = 88.617 [sec])
Background time interval of the image:
-299.640 -19.852 (delta_t = 279.788 [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 -19.852 sec. to 175.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82946 ( -0.171329 0.176669 )
Norm@50keV : 1.136350E-03 ( -1.223704E-04 1.204379E-04) )
------------------------------------------------------------
Chi-Squared = 65.99217 using 59 PHA bins.
Reduced chi-squared = 1.157757 for 57 degrees of freedom
Null hypothesis probability = 0.194
Photon flux (15-150 keV) in 195.3 sec: 0.158412 ( -0.0154 0.015422 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0411e-06 ( -2.20017e-07 2.23033e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -19.852 sec. to 175.460 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.18870 ( )
Epeak [keV] : 58.0436 ( -21.5748 9934.07 )
Norm@50keV : 2.503705E-03 ( -9.027622E-04 3.698734E-03) )
------------------------------------------------------------
Chi-Squared = 64.72461 using 59 PHA bins.
but latest trial 25.1856 gives Chi-Squared = 3.11405
but latest trial 9.308229E-04 gives Chi-Squared = 8.89381
Reduced chi-squared = 1.155797 for 56 degrees of freedom
Null hypothesis probability = 0.198
Photon flux (15-150 keV) in 195.3 sec: 0.155418 ( -0.01603 0.015903 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96499e-06 ( -2.46064e-07 2.47504e-07 ) ergs/cm2
Band function
Time interval is from -19.852 sec. to 175.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.37375 ( -8.62625 0.809906 )
beta : -9.28269 ( -0.717310 19.2741 )
Epeak [keV] : 62.9509 ( -19.7792 9937.05 )
Norm@50keV : 2.008522E-03 ( -8.808719E-04 3.455852E-03) )
------------------------------------------------------------
Chi-Squared = 64.57171 using 59 PHA bins.
Reduced chi-squared = 1.174031 for 55 degrees of freedom
Null hypothesis probability = 0.177
Photon flux (15-150 keV) in 195.3 sec: 0.155420 ( -0.016021 0.015995 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96405e-06 ( -1.87474e-07 2.46976e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 8.736 sec. to 9.736 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20956 ( -0.552868 0.510333 )
Norm@50keV : 6.013190E-03 ( -2.025947E-03 2.006649E-03) )
------------------------------------------------------------
Chi-Squared = 67.83037 using 59 PHA bins.
Reduced chi-squared = 1.190006 for 57 degrees of freedom
Null hypothesis probability = 0.154
Photon flux (15-150 keV) in 1.000 sec: 0.706661 ( -0.247256 0.253071 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.08188e-08 ( -2.05282e-08 2.07966e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.736 sec. to 9.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49888 ( -0.501121 3.34984 )
Epeak [keV] : 68.7650 ( -15.8783 109.133 )
Norm@50keV : 0.246720 ( -0.246720 0.103734 )
------------------------------------------------------------
Chi-Squared = 64.09373 using 59 PHA bins.
Reduced chi-squared = 1.144531 for 56 degrees of freedom
Null hypothesis probability = 0.214
Photon flux (15-150 keV) in 1.000 sec: 0.618817 ( -0.195089 0.2626 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.39186e-08 ( -1.76341e-08 2.22482e-08 ) ergs/cm2
Band function
Time interval is from 8.736 sec. to 9.736 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.69946 ( -2.64884 3.30054 )
beta : -9.16067 ( -4.386902E-05 19.9998 )
Epeak [keV] : 75.9602 ( -20.1904 116.130 )
Norm@50keV : 9.870508E-02 ( -0.129549 1.95159 )
------------------------------------------------------------
Chi-Squared = 64.29256 using 59 PHA bins.
Reduced chi-squared = 1.168956 for 55 degrees of freedom
Null hypothesis probability = 0.183
Photon flux (15-150 keV) in 1.000 sec: 0.632540 ( -0.198166 0.20268 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.27763e-08 ( -1.78935e-08 2.30136e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 16:28:47 EST 2008