batgrbproduct Analysis for Trigger=159913
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 9 16:21:18 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger159913/GCN5_download_hand
======================================================================
Trigger: 00159913 Segment: 000
BAT Trigger Time: 151133011.136 [s; MET]
Trigger Stop: 151133015.232 [s; MET]
UTC: 2005-10-16T05:23:31.350440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 122.811371428469 Dec: -18.311210933463 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.72
Image Trigger?: NO
Rate S/N Ratio: 12.4498995979887 [ if not an image trigger ]
Image S/N Ratio: 9.72
Flight Position: [ source = BAT ]
RA: 122.811371428469 Dec: -18.311210933463 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 122.810690751943 Dec: -18.2992306784985 [deg; J2000]
{ 08h 11m 14.6s , -18d 17' 57.2" }
+/- 1.93418524147108 [arcmin] (estimated 90% radius based on SNR)
+/- 0.874248360537202 [arcmin] (formal 1-sigma fit error)
SNR: 11.8531950172105
RA = 8h 11m 14.6s (122.810691 deg.)
Dec = -18d 17' 57" (-18.299231 deg.)
Angular difference between Flight and Ground position is 0.719860 arcmin
Partial Coding Fraction: 0.1777344 [ including projection effects ]
Duration
T90: 21 +/- 6.08276253029822
Measured from: -0.136000007390976
to: 20.863999992609 [s; relative to TRIGTIME]
T50: 7 +/- 5.09901951359278
Measured from: 1.86399999260902
to: 8.86399999260902 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.86399999260902
to: 5.86399999260902 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.136000007390976
to: 22.863999992609 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.370357 0.496324 0.347483 0.069175
0.061971 0.064484 0.055738 0.047259 [error]
Peak 0.042588 0.054321 0.040026 0.014902
0.013244 0.013475 0.012092 0.010486 [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 1.53e-07 2.32e-07 2.65e-07 5.78e-07 8.23e-07 1.22e-06 erg/cm2
Error 3.55e-08 3.41e-08 5.44e-08 2.47e-07 1.30e-07 2.95e-07 erg/cm2
Peak flux Power-law 4.69e-01 4.63e-01 3.20e-01 3.49e-01 1.39e+00 1.60e+00 ph/cm2/s
Error 2.35e-01 1.37e-01 9.94e-02 2.43e-01 3.81e-01 4.00e-01 ph/cm2/s
Fluence Cutoff-PL 1.48e-07 2.39e-07 2.70e-07 4.14e-07 8.14e-07 1.07e-06 erg/cm2
Error 4.10e-08 4.23e-08 5.95e-08 3.67e-07 1.35e-07 4.01e-07 erg/cm2
Peak flux Cutoff-PL 4.69e-01 4.64e-01 3.20e-01 3.47e-01 1.39e+00 1.60e+00 ph/cm2/s
Error 2.35e-01 1.37e-01 9.95e-02 2.41e-01 3.81e-01 4.00e-01 ph/cm2/s
Fluence Band 1.46e-07 2.39e-07 2.69e-07 4.65e-07 8.12e-07 1.08e-06 erg/cm2
Error 3.14e-08 4.12e-08 6.03e-08 4.20e-07 1.31e-07 3.06e-07 erg/cm2
Peak flux Band 4.40e-01 4.53e-01 3.27e-01 3.72e-01 1.39e+00 1.58e+00 ph/cm2/s
Error 1.47e-01 1.21e-01 6.52e-02 3.50e-01 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.809 0.257 - - 3.89e-03 6.02e-04 60.513 57
CPL 1.457 0.850 76.4 5000.0 5.89e-03 1.00e-02 60.397 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.533 0.504 - - 1.11e-02 2.78e-03 58.764 57
CPL 1.531 0.507 9997.6 5000.0 1.11e-02 2.79e-03 58.772 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: 5.440000 sec.
T50 in the 50-300 keV band: 2.112000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 23.000 -0.136 22.864
T90 21.000 -0.136 20.864
T50 7.000 1.864 8.864
Peak 1.000 4.864 5.864
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
122.8107 -18.2992 0.0163 49.3 9.1 1.3805 11.9 TRIG_00159913
------------------------------------------
Foreground time interval of the image:
-0.136 22.864 (delta_t = 23.000 [sec])
Background time interval of the image:
-299.136 -0.136 (delta_t = 299.000 [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 -0.136 sec. to 22.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80902 ( -0.251406 0.262794 )
Norm@50keV : 3.886664E-03 ( -6.074789E-04 5.956308E-04) )
------------------------------------------------------------
Chi-Squared = 60.51270 using 59 PHA bins.
Reduced chi-squared = 1.061626 for 57 degrees of freedom
Null hypothesis probability = 0.350
Photon flux (15-150 keV) in 23.00 sec: 0.537457 ( -0.080517 0.08085 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.22549e-07 ( -1.2886e-07 1.30175e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.136 sec. to 22.864 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45712 ( -1.05191 0.647417 )
Epeak [keV] : 76.4174 ( -76.4074 9923.58 )
Norm@50keV : 5.887806E-03 ( -5.887806E-03 1.415144E-02) )
------------------------------------------------------------
Chi-Squared = 60.39741 using 59 PHA bins.
but latest trial 2.07790 gives Chi-Squared = 0.687115
Reduced chi-squared = 1.078525 for 56 degrees of freedom
Null hypothesis probability = 0.320
Photon flux (15-150 keV) in 23.00 sec: 0.533121 ( -0.082909 0.082414 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.13947e-07 ( -1.36802e-07 1.32901e-07 ) ergs/cm2
Band function
Time interval is from -0.136 sec. to 22.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39233 ( -8.60767 4.00801 )
beta : -2.14156 ( -7.85844 0.578368 )
Epeak [keV] : 69.7602 ( -69.6602 9930.24 )
Norm@50keV : 6.405488E-03 ( -3.135729E-03 7.38987 )
------------------------------------------------------------
Chi-Squared = 60.39436 using 59 PHA bins.
Reduced chi-squared = 1.098079 for 55 degrees of freedom
Null hypothesis probability = 0.287
Photon flux (15-150 keV) in 23.00 sec: 0.532493 ( -0.082666 0.08299 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1193e-07 ( -1.29403e-07 1.31939e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.864 sec. to 5.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53278 ( -0.507904 0.500818 )
Norm@50keV : 1.105295E-02 ( -2.787834E-03 2.771670E-03) )
------------------------------------------------------------
Chi-Squared = 58.76426 using 59 PHA bins.
Reduced chi-squared = 1.030952 for 57 degrees of freedom
Null hypothesis probability = 0.411
Photon flux (15-150 keV) in 1.000 sec: 1.39239 ( -0.38055 0.38227 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04338e-07 ( -2.79007e-08 2.7979e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.864 sec. to 5.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53116 ( -0.511411 0.503371 )
Epeak [keV] : 9997.62 ( -9997.61 2.37891 )
Norm@50keV : 1.108338E-02 ( -2.803547E-03 2.782405E-03) )
------------------------------------------------------------
Chi-Squared = 58.77158 using 59 PHA bins.
Reduced chi-squared = 1.049492 for 56 degrees of freedom
Null hypothesis probability = 0.374
Photon flux (15-150 keV) in 1.000 sec: 1.39180 ( -0.38042 0.38216 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04345e-07 ( -2.78827e-08 2.7982e-08 ) ergs/cm2
Band function
Time interval is from 4.864 sec. to 5.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11573 ( -10.7048 4.29517 )
beta : -1.53529 ( -0.629567 0.478305 )
Epeak [keV] : 47.4224 ( -24.9661 488.791 )
Norm@50keV : 2.353550E-02 ( -0.540150 4575.56 )
------------------------------------------------------------
Chi-Squared = 58.75209 using 59 PHA bins.
Reduced chi-squared = 1.068220 for 55 degrees of freedom
Null hypothesis probability = 0.340
Photon flux (15-150 keV) in 1.000 sec: 1.38675 ( -0.34652 0.35443 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0371e-07 ( -2.67445e-08 2.8224e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 16:36:41 EST 2008