batgrbproduct Analysis for Trigger=200638
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 Dec 31 13:39:45 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger200638/GCN5_download_cron
======================================================================
Trigger: 00200638 Segment: 000
BAT Trigger Time: 163298951.68 [s; MET]
Trigger Stop: 163298952.704 [s; MET]
UTC: 2006-03-06T00:49:10.626240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 41.098878206475 Dec: -2.15303951917031 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.98
Image Trigger?: NO
Rate S/N Ratio: 60.7618301238533 [ if not an image trigger ]
Image S/N Ratio: 19.98
Flight Position: [ source = BAT ]
RA: 41.098878206475 Dec: -2.15303951917031 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 41.100023429023 Dec: -2.16296369741065 [deg; J2000]
{ 02h 44m 24.0s , -02d 09' 46.7" }
+/- 1.05092366571186 [arcmin] (estimated 90% radius based on SNR)
+/- 0.498574891626449 [arcmin] (formal 1-sigma fit error)
SNR: 28.3336431579928
RA = 2h 44m 24.0s (41.100023 deg.)
Dec = -2d 9' 47" (-2.162964 deg.)
Angular difference between Flight and Ground position is 0.599397 arcmin
Partial Coding Fraction: 0.5 [ including projection effects ]
Duration
T90: 61.188000023365 +/- 3.5188407189561
Measured from: -0.872000008821487
to: 60.3160000145435 [s; relative to TRIGTIME]
T50: 42.7479999959469 +/- 0.642893437653167
Measured from: 0.61599999666214
to: 43.363999992609 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.183999985456467
to: 1.18399998545647 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.35199999809265
to: 66.919999986887 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.113866 1.392419 0.821621 0.196481
0.055297 0.056800 0.050566 0.045102 [error]
Peak 0.157372 0.273210 0.213944 0.056028
0.010557 0.012105 0.011309 0.008075 [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 4.16e-07 6.21e-07 6.92e-07 1.46e-06 2.17e-06 3.19e-06 erg/cm2
Error 3.64e-08 3.25e-08 5.08e-08 2.28e-07 1.19e-07 2.68e-07 erg/cm2
Peak flux Power-law 1.95e+00 2.02e+00 1.47e+00 1.72e+00 6.10e+00 7.15e+00 ph/cm2/s
Error 1.89e-01 1.20e-01 9.07e-02 2.19e-01 3.38e-01 3.74e-01 ph/cm2/s
Fluence Cutoff-PL 3.86e-07 6.49e-07 7.05e-07 7.53e-07 2.09e-06 2.49e-06 erg/cm2
Error 4.46e-08 4.07e-08 5.49e-08 4.41e-07 1.37e-07 4.61e-07 erg/cm2
Peak flux Cutoff-PL 1.73e+00 2.10e+00 1.56e+00 1.06e+00 5.97e+00 6.45e+00 ph/cm2/s
Error 2.36e-01 1.37e-01 1.14e-01 3.62e-01 3.49e-01 5.08e-01 ph/cm2/s
Fluence Band 3.75e-07 6.55e-07 6.86e-07 1.08e-06 2.09e-06 2.81e-06 erg/cm2
Error 4.60e-08 4.44e-08 5.99e-08 4.88e-07 1.34e-07 4.86e-07 erg/cm2
Peak flux Band 1.73e+00 2.10e+00 1.56e+00 1.21e+00 5.96e+00 6.60e+00 ph/cm2/s
Error 2.80e-01 1.74e-01 1.37e-01 5.46e-01 3.65e-01 6.03e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.843 0.096 - - 3.46e-03 1.87e-04 53.988 57
CPL 1.375 0.425 64.5 53.8 6.02e-03 3.16e-03 50.107 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.457 0.090 - - 4.94e-02 2.58e-03 67.186 57
CPL 0.928 0.389 110.7 75.4 8.78e-02 3.78e-02 61.095 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: 44.864000 sec.
T50 in the 50-300 keV band: 27.520000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 68.272 -1.352 66.920
T90 61.188 -0.872 60.316
T50 42.748 0.616 43.364
Peak 1.000 0.184 1.184
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
41.1000 -2.1630 0.0068 40.9 -164.3 1.9466 28.3 TRIG_00200638
------------------------------------------
Foreground time interval of the image:
-1.352 14.821 (delta_t = 16.173 [sec])
Background time interval of the image:
-299.680 -1.352 (delta_t = 298.328 [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 -1.352 sec. to 66.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84350 ( -9.543133E-02 9.669960E-02) )
Norm@50keV : 3.457474E-03 ( -1.883050E-04 1.866489E-04) )
------------------------------------------------------------
Chi-Squared = 53.98824 using 59 PHA bins.
Reduced chi-squared = 0.9471622 for 57 degrees of freedom
Null hypothesis probability = 0.589
Photon flux (15-150 keV) in 68.27 sec: 0.484703 ( -0.026251 0.026341 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17057e-06 ( -1.18626e-07 1.19343e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.352 sec. to 66.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37524 ( -0.441258 0.408531 )
Epeak [keV] : 64.4801 ( -12.5882 94.9529 )
Norm@50keV : 6.020069E-03 ( -2.264873E-03 4.059711E-03) )
------------------------------------------------------------
Chi-Squared = 50.10669 using 59 PHA bins.
Reduced chi-squared = 0.8947622 for 56 degrees of freedom
Null hypothesis probability = 0.696
Photon flux (15-150 keV) in 68.27 sec: 0.471642 ( -0.02853 0.028528 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09454e-06 ( -1.37052e-07 1.37243e-07 ) ergs/cm2
Band function
Time interval is from -1.352 sec. to 66.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36273 ( -0.416411 0.429267 )
beta : -9.08395 ( -7.87204 0.259651 )
Epeak [keV] : 64.0154 ( -21.7764 50.6209 )
Norm@50keV : 6.107785E-03 ( -3.908766E-03 5.008223E-02) )
------------------------------------------------------------
Chi-Squared = 50.11205 using 59 PHA bins.
Reduced chi-squared = 0.9111282 for 55 degrees of freedom
Null hypothesis probability = 0.661
Photon flux (15-150 keV) in 68.27 sec: 0.469073 ( -0.02935 0.028646 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09271e-06 ( -1.34833e-07 1.32273e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.184 sec. to 1.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45691 ( -8.933878E-02 8.969283E-02) )
Norm@50keV : 4.943236E-02 ( -2.584394E-03 2.583608E-03) )
------------------------------------------------------------
Chi-Squared = 67.18622 using 59 PHA bins.
Reduced chi-squared = 1.178706 for 57 degrees of freedom
Null hypothesis probability = 0.168
Photon flux (15-150 keV) in 1.000 sec: 6.10241 ( -0.33746 0.33813 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.72427e-07 ( -2.6323e-08 2.643e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.184 sec. to 1.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.927502 ( -0.405134 0.372159 )
Epeak [keV] : 110.745 ( -26.6406 124.060 )
Norm@50keV : 8.781816E-02 ( -2.861499E-02 4.707020E-02) )
------------------------------------------------------------
Chi-Squared = 61.09457 using 59 PHA bins.
Reduced chi-squared = 1.090974 for 56 degrees of freedom
Null hypothesis probability = 0.298
Photon flux (15-150 keV) in 1.000 sec: 5.97251 ( -0.34826 0.34891 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.63335e-07 ( -2.7713e-08 2.7766e-08 ) ergs/cm2
Band function
Time interval is from 0.184 sec. to 1.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.909577 ( -0.388107 2.03413 )
beta : -2.07922 ( -7.92078 0.582117 )
Epeak [keV] : 107.744 ( -60.8165 124.697 )
Norm@50keV : 8.984453E-02 ( -3.051740E-02 0.876129 )
------------------------------------------------------------
Chi-Squared = 61.06715 using 59 PHA bins.
Reduced chi-squared = 1.110312 for 55 degrees of freedom
Null hypothesis probability = 0.267
Photon flux (15-150 keV) in 1.000 sec: 5.96179 ( -0.37253 0.35769 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.63195e-07 ( -2.7932e-08 2.7559e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 13:52:00 EST 2007