batgrbproduct Analysis for Trigger=114797
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): Sat Jan 5 00:22:16 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger114797/GCN_download_cron
======================================================================
Trigger: 00114797 Segment: 000
BAT Trigger Time: 135383753.6 [s; MET]
Trigger Stop: 135383754.112 [s; MET]
UTC: 2005-04-16T22:35:54.119620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 133.852677933438 Dec: 11.1731175564645 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: NO
Rate S/N Ratio: 25.5734237050888 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 133.852677933438 Dec: 11.1731175564645 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 133.845829303472 Dec: 11.1860540832296 [deg; J2000]
{ 08h 55m 23.0s , +11d 11' 09.8" }
+/- 1.35470646058504 [arcmin] (estimated 90% radius based on SNR)
+/- 0.671679123018735 [arcmin] (formal 1-sigma fit error)
SNR: 19.7136976501978
RA = 8h 55m 23.0s (133.845829 deg.)
Dec = 11d 11' 10" (11.186054 deg.)
Angular difference between Flight and Ground position is 0.874631 arcmin
Partial Coding Fraction: 0.1289062 [ including projection effects ]
Duration
T90: 3.39200001955032 +/- 0.63150613607837
Measured from: 0.187999993562698
to: 3.58000001311302 [s; relative to TRIGTIME]
T50: 1.61599999666214 +/- 0.365666519987123
Measured from: 0.612000018358231
to: 2.22800001502037 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.136000007390976
to: 1.13600000739098 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0719999969005585
to: 4.19600000977516 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.282176 0.515850 0.550942 0.064884
0.033907 0.037960 0.037632 0.034779 [error]
Peak 0.096792 0.221900 0.276809 0.093181
0.017420 0.021244 0.022638 0.019332 [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 1.30e-07 2.58e-07 4.01e-07 1.37e-06 1.12e-06 2.08e-06 erg/cm2
Error 1.88e-08 2.29e-08 3.59e-08 2.74e-07 9.09e-08 0.00e+00 erg/cm2
Peak flux Power-law 1.37e+00 1.81e+00 1.75e+00 3.04e+00 5.93e+00 7.96e+00 ph/cm2/s
Error 2.79e-01 2.30e-01 1.69e-01 6.12e-01 6.08e-01 7.65e-01 ph/cm2/s
Fluence Cutoff-PL 1.04e-07 2.77e-07 4.44e-07 5.12e-07 1.08e-06 1.35e-06 erg/cm2
Error 2.38e-08 2.72e-08 4.61e-08 3.13e-07 9.68e-08 3.17e-07 erg/cm2
Peak flux Cutoff-PL 1.22e+00 1.84e+00 1.86e+00 2.19e+00 5.87e+00 7.12e+00 ph/cm2/s
Error 4.43e-01 2.47e-01 2.44e-01 1.10e+00 6.12e-01 1.25e+00 ph/cm2/s
Fluence Band 1.03e-07 2.76e-07 4.43e-07 5.14e-07 1.08e-06 1.31e-06 erg/cm2
Error 2.36e-08 2.71e-08 4.60e-08 3.12e-07 9.66e-08 0.00e+00 erg/cm2
Peak flux Band 1.20e+00 1.85e+00 1.86e+00 2.50e+00 5.85e+00 7.41e+00 ph/cm2/s
Error 2.99e-01 3.13e-01 2.50e-01 8.30e-01 6.50e-01 1.14e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.364 0.130 - - 2.79e-02 2.15e-03 67.373 57
CPL 0.413 0.659 93.7 42.1 7.57e-02 5.74e-02 59.691 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.044 0.160 - - 5.13e-02 5.06e-03 44.087 57
CPL 0.644 0.630 208.9 5000.0 7.59e-02 5.20e-02 42.983 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: 2.752000 sec.
T50 in the 50-300 keV band: 1.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 4.124 0.072 4.196
T90 3.392 0.188 3.580
T50 1.616 0.612 2.228
Peak 1.000 0.136 1.136
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
133.8458 +11.1861 0.0097 53.2 -153.1 1.6026 19.7 TRIG_00114797
------------------------------------------
Foreground time interval of the image:
0.072 4.196 (delta_t = 4.124 [sec])
Background time interval of the image:
-299.600 0.072 (delta_t = 299.672 [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 0.072 sec. to 4.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36432 ( -0.129876 0.129312 )
Norm@50keV : 2.788789E-02 ( -2.148131E-03 2.148032E-03) )
------------------------------------------------------------
Chi-Squared = 67.37256 using 59 PHA bins.
Reduced chi-squared = 1.181975 for 57 degrees of freedom
Null hypothesis probability = 0.164
Photon flux (15-150 keV) in 4.124 sec: 3.36978 ( -0.27779 0.27877 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1196e-06 ( -9.06373e-08 9.10827e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.072 sec. to 4.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.412771 ( -0.711619 0.607144 )
Epeak [keV] : 93.6713 ( -18.8588 65.4237 )
Norm@50keV : 7.571012E-02 ( -3.505244E-02 7.966784E-02) )
------------------------------------------------------------
Chi-Squared = 59.69132 using 59 PHA bins.
Reduced chi-squared = 1.065916 for 56 degrees of freedom
Null hypothesis probability = 0.343
Photon flux (15-150 keV) in 4.124 sec: 3.23828 ( -0.29018 0.29102 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0848e-06 ( -9.70583e-08 9.64645e-08 ) ergs/cm2
Band function
Time interval is from 0.072 sec. to 4.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.412912 ( -0.606989 0.711866 )
beta : -9.00166 ( -0.998339 7.43905 )
Epeak [keV] : 93.6505 ( -18.8530 65.4101 )
Norm@50keV : 7.571003E-02 ( -3.502372E-02 7.973121E-02) )
------------------------------------------------------------
Chi-Squared = 59.69141 using 59 PHA bins.
Reduced chi-squared = 1.085298 for 55 degrees of freedom
Null hypothesis probability = 0.309
Photon flux (15-150 keV) in 4.124 sec: 3.23862 ( -0.29042 0.29086 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08433e-06 ( -9.72233e-08 9.60273e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.136 sec. to 1.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04381 ( -0.162692 0.157237 )
Norm@50keV : 5.134010E-02 ( -5.079340E-03 5.030707E-03) )
------------------------------------------------------------
Chi-Squared = 44.08731 using 59 PHA bins.
Reduced chi-squared = 0.7734616 for 57 degrees of freedom
Null hypothesis probability = 0.895
Photon flux (15-150 keV) in 1.000 sec: 5.92683 ( -0.60656 0.609 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.49033e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.136 sec. to 1.136 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.644465 ( -0.743513 0.517006 )
Epeak [keV] : 208.878 ( -208.868 9791.12 )
Norm@50keV : 7.589150E-02 ( -2.823050E-02 7.586061E-02) )
------------------------------------------------------------
Chi-Squared = 42.98293 using 59 PHA bins.
but latest trial 4.763655E-02 gives Chi-Squared = 3.11593
Reduced chi-squared = 0.7675524 for 56 degrees of freedom
Null hypothesis probability = 0.899
Photon flux (15-150 keV) in 1.000 sec: 5.87451 ( -0.61075 0.61275 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.46457e-07 ( -5.3229e-08 5.3482e-08 ) ergs/cm2
Band function
Time interval is from 0.136 sec. to 1.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.203946 ( -9.79605 5.16049 )
beta : -1.19250 ( -8.80750 0.268724 )
Epeak [keV] : 97.5792 ( -97.4792 7775.73 )
Norm@50keV : 0.139972 ( -0.705249 303.897 )
------------------------------------------------------------
Chi-Squared = 42.84037 using 59 PHA bins.
Reduced chi-squared = 0.7789159 for 55 degrees of freedom
Null hypothesis probability = 0.884
Photon flux (15-150 keV) in 1.000 sec: 5.84631 ( -0.67251 0.62834 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.46459e-07 ( -5.3449e-08 5.321e-08 ) ergs/cm2
Plot creation:
Sat Jan 5 00:34:40 EST 2008