batgrbproduct Analysis for Trigger=113120
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): Fri Jan 4 22:59:38 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger113120/SDC
======================================================================
Trigger: 00113120 Segment: 000
BAT Trigger Time: 134058014.784 [s; MET]
Trigger Stop: 134058015.808 [s; MET]
UTC: 2005-04-01T14:20:15.326620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 247.880487633644 Dec: 2.18388293694669 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10
Image Trigger?: NO
Rate S/N Ratio: 45.3431361950185 [ if not an image trigger ]
Image S/N Ratio: 10
Flight Position: [ source = BAT ]
RA: 247.880487633644 Dec: 2.18388293694669 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 247.873189273356 Dec: 2.18472011528577 [deg; J2000]
{ 16h 31m 29.6s , +02d 11' 05.0" }
+/- 1.11670853279508 [arcmin] (estimated 90% radius based on SNR)
+/- 0.381145155087716 [arcmin] (formal 1-sigma fit error)
SNR: 25.9796264340708
RA = 16h 31m 29.6s (247.873189 deg.)
Dec = 2d 11' 5" (2.184720 deg.)
Angular difference between Flight and Ground position is 0.440457 arcmin
Partial Coding Fraction: 0.05712891 [ including projection effects ]
Duration
T90: 32.580000013113 +/- 0.62535750013415
Measured from: -5.61599999666214
to: 26.9640000164509 [s; relative to TRIGTIME]
T50: 25.6280000060797 +/- 0.528015154593986
Measured from: -0.687999993562698
to: 24.940000012517 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 24.2719999998808
to: 25.2719999998808 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.91200000047684
to: 27.8760000020266 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.308467 3.825941 3.728362 1.375331
0.146249 0.161679 0.149068 0.114986 [error]
Peak 0.214857 0.453457 0.570960 0.212253
0.032624 0.040149 0.041945 0.028950 [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 1.02e-06 1.96e-06 2.93e-06 9.40e-06 8.25e-06 1.53e-05 erg/cm2
Error 9.23e-08 1.06e-07 1.41e-07 1.02e-06 3.64e-07 1.08e-06 erg/cm2
Peak flux Power-law 3.21e+00 3.87e+00 3.38e+00 5.05e+00 1.22e+01 1.55e+01 ph/cm2/s
Error 5.35e-01 4.14e-01 3.02e-01 8.81e-01 1.13e+00 1.33e+00 ph/cm2/s
Fluence Cutoff-PL 9.64e-07 1.99e-06 3.01e-06 7.40e-06 8.22e-06 1.08e-05 erg/cm2
Error 1.19e-07 1.41e-07 1.83e-07 2.52e-06 3.70e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.28e+00 4.12e+00 4.05e+00 2.30e+00 1.19e+01 1.28e+01 ph/cm2/s
Error 6.48e-01 4.84e-01 4.55e-01 9.10e-01 1.14e+00 1.43e+00 ph/cm2/s
Fluence Band 9.15e-07 2.01e-06 2.99e-06 8.36e-06 8.16e-06 1.15e-05 erg/cm2
Error 1.32e-07 1.01e-07 1.46e-07 1.30e-06 3.74e-07 0.00e+00 erg/cm2
Peak flux Band 2.22e+00 4.17e+00 4.00e+00 3.04e+00 1.18e+01 1.34e+01 ph/cm2/s
Error 7.21e-01 5.32e-01 3.74e-01 1.37e+00 1.18e+00 1.78e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.424 0.077 - - 2.47e-02 1.09e-03 57.382 57
CPL 1.224 0.294 229.6 5000.0 3.02e-02 8.96e-03 56.229 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.197 0.132 - - 1.04e-01 9.10e-03 70.607 57
CPL -0.045 0.699 99.1 30.0 3.59e-01 2.69e-01 58.301 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: 33.024000 sec.
T50 in the 50-300 keV band: 25.536000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 34.788 -6.912 27.876
T90 32.580 -5.616 26.964
T50 25.628 -0.688 24.940
Peak 1.000 24.272 25.272
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
247.8732 +2.1847 0.0074 55.7 5.6 11.6744 26.0 TRIG_00113120
------------------------------------------
Foreground time interval of the image:
-6.912 27.876 (delta_t = 34.788 [sec])
Background time interval of the image:
-299.784 -6.912 (delta_t = 292.872 [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 -6.912 sec. to 27.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42427 ( -7.691514E-02 7.643318E-02) )
Norm@50keV : 2.465380E-02 ( -1.090189E-03 1.087654E-03) )
------------------------------------------------------------
Chi-Squared = 57.38163 using 59 PHA bins.
Reduced chi-squared = 1.006695 for 57 degrees of freedom
Null hypothesis probability = 0.461
Photon flux (15-150 keV) in 34.79 sec: 3.01933 ( -0.15229 0.15301 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.2476e-06 ( -3.63416e-07 3.63695e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.912 sec. to 27.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22417 ( -0.333265 0.255646 )
Epeak [keV] : 229.632 ( -229.622 9770.37 )
Norm@50keV : 3.017359E-02 ( -6.267156E-03 1.165801E-02) )
------------------------------------------------------------
Chi-Squared = 56.22878 using 59 PHA bins.
Reduced chi-squared = 1.004085 for 56 degrees of freedom
Null hypothesis probability = 0.466
Photon flux (15-150 keV) in 34.79 sec: 2.98796 ( -0.15864 0.15783 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.21907e-06 ( -3.6853e-07 3.70513e-07 ) ergs/cm2
Band function
Time interval is from -6.912 sec. to 27.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.921508 ( -9.07849 1.73462 )
beta : -1.56579 ( -8.43421 0.174223 )
Epeak [keV] : 105.803 ( -105.703 9860.22 )
Norm@50keV : 4.354384E-02 ( -1.862089E-02 1043.90 )
------------------------------------------------------------
Chi-Squared = 54.96866 using 59 PHA bins.
Reduced chi-squared = 0.9994302 for 55 degrees of freedom
Null hypothesis probability = 0.476
Photon flux (15-150 keV) in 34.79 sec: 2.95643 ( -0.16723 0.16614 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.16295e-06 ( -3.73958e-07 3.74201e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 24.272 sec. to 25.272 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19717 ( -0.132847 0.130792 )
Norm@50keV : 0.104312 ( -9.108916E-03 9.081170E-03) )
------------------------------------------------------------
Chi-Squared = 70.60674 using 59 PHA bins.
Reduced chi-squared = 1.238715 for 57 degrees of freedom
Null hypothesis probability = 0.106
Photon flux (15-150 keV) in 1.000 sec: 12.2392 ( -1.1322 1.1364 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05914e-06 ( -9.2575e-08 9.2644e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.272 sec. to 25.272 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.491899E-02 ( -0.755458 0.642560 )
Epeak [keV] : 99.1317 ( -17.3609 42.5992 )
Norm@50keV : 0.359064 ( -0.165859 0.372135 )
------------------------------------------------------------
Chi-Squared = 58.30134 using 59 PHA bins.
Reduced chi-squared = 1.041095 for 56 degrees of freedom
Null hypothesis probability = 0.391
Photon flux (15-150 keV) in 1.000 sec: 11.9405 ( -1.1318 1.1392 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06122e-06 ( -9.6946e-08 9.6078e-08 ) ergs/cm2
Band function
Time interval is from 24.272 sec. to 25.272 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.600065E-02 ( -0.643595 0.716341 )
beta : -9.32949 ( -7.90999 0.625495 )
Epeak [keV] : 99.0812 ( -34.4049 29.4881 )
Norm@50keV : 0.359480 ( -0.453865 3.85319 )
------------------------------------------------------------
Chi-Squared = 58.30125 using 59 PHA bins.
Reduced chi-squared = 1.060023 for 55 degrees of freedom
Null hypothesis probability = 0.355
Photon flux (15-150 keV) in 1.000 sec: 11.8474 ( -1.1764 1.1913 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06056e-06 ( -9.6751e-08 9.6141e-08 ) ergs/cm2
Plot creation:
Fri Jan 4 23:17:49 EST 2008