batgrbproduct Analysis for Trigger=163438
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 18:25:40 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger163438/SDC
======================================================================
Trigger: 00163438 Segment: 000
BAT Trigger Time: 153381581.312 [s; MET]
Trigger Stop: 153381582.336 [s; MET]
UTC: 2005-11-11T05:59:41.478720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 348.157448391974 Dec: 18.3675138886497 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.07
Image Trigger?: NO
Rate S/N Ratio: 37.0944739819828 [ if not an image trigger ]
Image S/N Ratio: 15.07
Flight Position: [ source = BAT ]
RA: 348.157448391974 Dec: 18.3675138886497 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 348.13667372027 Dec: 18.3611996228263 [deg; J2000]
{ 23h 12m 32.8s , +18d 21' 40.3" }
+/- 0.892202528209505 [arcmin] (estimated 90% radius based on SNR)
+/- 0.264499425144073 [arcmin] (formal 1-sigma fit error)
SNR: 35.8001528284306
RA = 23h 12m 32.8s (348.136674 deg.)
Dec = 18d 21' 40" (18.361200 deg.)
Angular difference between Flight and Ground position is 1.242184 arcmin
Partial Coding Fraction: 0.59375 [ including projection effects ]
Duration
T90: 59.7759999930859 +/- 12.3014925950996
Measured from: -3.82400000095367
to: 55.9519999921322 [s; relative to TRIGTIME]
T50: 17.5360000133514 +/- 1.59999998807907
Measured from: 0.65599998831749
to: 18.1920000016689 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.324000000953674
to: 0.675999999046326 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.9360000193119
to: 82.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.425669 2.310320 1.881988 0.473462
0.062470 0.064300 0.057018 0.047812 [error]
Peak 0.073944 0.106732 0.108495 0.035098
0.007502 0.008342 0.007897 0.006476 [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 4.70e-07 9.57e-07 1.52e-06 5.35e-06 4.22e-06 8.29e-06 erg/cm2
Error 3.36e-08 3.92e-08 5.88e-08 4.94e-07 1.47e-07 5.18e-07 erg/cm2
Peak flux Power-law 6.55e-01 8.26e-01 7.59e-01 1.22e+00 2.66e+00 3.46e+00 ph/cm2/s
Error 1.06e-01 8.04e-02 6.68e-02 2.36e-01 2.17e-01 2.90e-01 ph/cm2/s
Fluence Cutoff-PL 4.49e-07 9.67e-07 1.55e-06 4.18e-06 4.18e-06 7.08e-06 erg/cm2
Error 4.35e-08 4.18e-08 6.97e-08 1.28e-06 1.56e-07 1.28e-06 erg/cm2
Peak flux Cutoff-PL 6.31e-01 8.35e-01 7.76e-01 1.03e+00 2.64e+00 3.33e+00 ph/cm2/s
Error 1.30e-01 8.58e-02 8.26e-02 4.17e-01 2.18e-01 4.73e-01 ph/cm2/s
Fluence Band 4.45e-07 9.63e-07 1.55e-06 4.18e-06 4.17e-06 7.21e-06 erg/cm2
Error 4.32e-08 4.17e-08 6.98e-08 1.28e-06 1.58e-07 1.28e-06 erg/cm2
Peak flux Band 6.28e-01 8.35e-01 7.76e-01 1.03e+00 2.64e+00 3.27e+00 ph/cm2/s
Error 1.30e-01 8.58e-02 8.26e-02 4.17e-01 2.22e-01 4.56e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.334 0.064 - - 4.85e-03 1.62e-04 45.917 57
CPL 1.127 0.247 240.7 4929.9 5.98e-03 1.46e-03 44.179 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.122 0.142 - - 2.28e-02 1.80e-03 69.210 57
CPL 0.962 0.436 370.7 5000.0 2.70e-02 1.35e-02 68.900 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: 108.032000 sec.
T50 in the 50-300 keV band: 20.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 88.640 -5.936 82.704
T90 59.776 -3.824 55.952
T50 17.536 0.656 18.192
Peak 1.000 -0.324 0.676
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
348.1367 +18.3612 0.0054 27.2 136.1 5.9740 35.8 TRIG_00163438
------------------------------------------
Foreground time interval of the image:
-5.936 82.704 (delta_t = 88.640 [sec])
Background time interval of the image:
-127.411 -5.936 (delta_t = 121.475 [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 -5.936 sec. to 82.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33373 ( -6.402671E-02 6.373775E-02) )
Norm@50keV : 4.854885E-03 ( -1.616813E-04 1.615845E-04) )
------------------------------------------------------------
Chi-Squared = 45.91746 using 59 PHA bins.
Reduced chi-squared = 0.8055695 for 57 degrees of freedom
Null hypothesis probability = 0.853
Photon flux (15-150 keV) in 88.64 sec: 0.582955 ( -0.021475 0.021552 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.21859e-06 ( -1.47089e-07 1.47311e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.936 sec. to 82.704 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12745 ( -0.251145 0.242139 )
Epeak [keV] : 240.727 ( -100.493 9759.27 )
Norm@50keV : 5.981827E-03 ( -1.220006E-03 1.701439E-03) )
------------------------------------------------------------
Chi-Squared = 44.17923 using 59 PHA bins.
but latest trial 4.878493E-03 gives Chi-Squared = 1.66838
Reduced chi-squared = 0.7889149 for 56 degrees of freedom
Null hypothesis probability = 0.873
Photon flux (15-150 keV) in 88.64 sec: 0.575521 ( -0.023246 0.023237 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17695e-06 ( -1.58728e-07 1.54198e-07 ) ergs/cm2
Band function
Time interval is from -5.936 sec. to 82.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.836198 ( -9.16380 4.07837 )
beta : -1.40411 ( -7.99178 0.713233 )
Epeak [keV] : 96.9721 ( -254.771 9745.13 )
Norm@50keV : 9.089358E-03 ( -1.135615E-03 1.766736E-03) )
------------------------------------------------------------
Chi-Squared = 44.21353 using 59 PHA bins.
Reduced chi-squared = 0.8038823 for 55 degrees of freedom
Null hypothesis probability = 0.851
Photon flux (15-150 keV) in 88.64 sec: 0.573211 ( -0.024718 0.024702 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17411e-06 ( -1.59011e-07 1.57451e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.304 sec. to 0.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12180 ( -0.142631 0.140442 )
Norm@50keV : 2.284869E-02 ( -1.800895E-03 1.797561E-03) )
------------------------------------------------------------
Chi-Squared = 69.20952 using 59 PHA bins.
Reduced chi-squared = 1.214202 for 57 degrees of freedom
Null hypothesis probability = 0.129
Photon flux (15-150 keV) in 0.9600 sec: 2.65616 ( -0.21659 0.21714 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27838e-07 ( -1.96416e-08 1.95773e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.304 sec. to 0.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.961672 ( -0.583696 0.288577 )
Epeak [keV] : 370.653 ( -370.643 9629.35 )
Norm@50keV : 2.702655E-02 ( -5.762599E-03 2.123791E-02) )
------------------------------------------------------------
Chi-Squared = 68.90001 using 59 PHA bins.
Reduced chi-squared = 1.230357 for 56 degrees of freedom
Null hypothesis probability = 0.115
Photon flux (15-150 keV) in 0.9600 sec: 2.63960 ( -0.21354 0.22224 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26467e-07 ( -2.01802e-08 2.01581e-08 ) ergs/cm2
Band function
Time interval is from -0.304 sec. to 0.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.99207 ( -8.00793 6.95028 )
beta : -1.12180 ( -0.140504 10.8855 )
Epeak [keV] : 9997.70 ( -9997.60 2.29980 )
Norm@50keV : 2.284725E-02 ( -1.788577E-03 1.790509E-03) )
------------------------------------------------------------
Chi-Squared = 69.20951 using 59 PHA bins.
Reduced chi-squared = 1.258355 for 55 degrees of freedom
Null hypothesis probability = 9.418E-02
Photon flux (15-150 keV) in 0.9600 sec: 2.63986 ( -0.22235 0.22155 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26347e-07 ( -2.02944e-08 2.01254e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 18:34:46 EST 2008