batgrbproduct Analysis for Trigger=303105
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 Feb 13 04:37:11 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger303105/GCN5_download_cron
======================================================================
Trigger: 00303105 Segment: 000
BAT Trigger Time: 224530476.032 [s; MET]
Trigger Stop: 224530480.128 [s; MET]
UTC: 2008-02-12T17:34:33.462080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 231.106540249564 Dec: -22.7519170931094 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.18
Image Trigger?: NO
Rate S/N Ratio: 10.5356537528527 [ if not an image trigger ]
Image S/N Ratio: 7.18
Flight Position: [ source = BAT ]
RA: 231.106540249564 Dec: -22.7519170931094 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 231.144841215396 Dec: -22.7385732852153 [deg; J2000]
{ 15h 24m 34.8s , -22d 44' 18.9" }
+/- 1.47714931976206 [arcmin] (estimated 90% radius based on SNR)
+/- 0.588106605737663 [arcmin] (formal 1-sigma fit error)
SNR: 17.4214189401488
RA = 15h 24m 34.8s (231.144841 deg.)
Dec = -22d 44' 19" (-22.738573 deg.)
Angular difference between Flight and Ground position is 2.265531 arcmin
Partial Coding Fraction: 0.3554688 [ including projection effects ]
Duration
T90: 122.787999987602 +/- 13.2866805477133
Measured from: -52.7599999904633
to: 70.027999997139 [s; relative to TRIGTIME]
T50: 48.1679999828339 +/- 15.1381675378552
Measured from: -16.7759999930859
to: 31.391999989748 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.75200000405312
to: 4.75200000405312 [s; relative to TRIGTIME]
Total Fluence
Measured from: -60.5399999916553
to: 75.7400000095367 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.060631 1.951563 1.384291 0.259804
0.117957 0.107931 0.095967 0.081916 [error]
Peak 0.028719 0.050466 0.046428 0.009839
0.010741 0.010086 0.009321 0.007828 [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 8.19e-07 1.09e-06 2.97e-06 3.18e-06 5.39e-06 erg/cm2
Error 5.59e-08 5.95e-08 9.21e-08 5.38e-07 2.26e-07 6.06e-07 erg/cm2
Peak flux Power-law 3.43e-01 3.80e-01 3.01e-01 3.93e-01 1.17e+00 1.42e+00 ph/cm2/s
Error 1.43e-01 9.83e-02 7.00e-02 1.93e-01 2.69e-01 2.99e-01 ph/cm2/s
Fluence Cutoff-PL 3.68e-07 9.10e-07 1.18e-06 7.58e-07 2.95e-06 3.22e-06 erg/cm2
Error 6.91e-08 7.56e-08 1.11e-07 4.42e-07 2.54e-07 4.94e-07 erg/cm2
Peak flux Cutoff-PL 2.92e-01 3.96e-01 3.26e-01 2.26e-01 1.14e+00 1.24e+00 ph/cm2/s
Error 1.74e-01 1.11e-01 9.17e-02 2.93e-01 2.76e-01 3.91e-01 ph/cm2/s
Fluence Band 3.48e-07 9.25e-07 1.13e-06 1.42e-06 2.95e-06 3.79e-06 erg/cm2
Error 7.52e-08 8.20e-08 1.29e-07 9.33e-07 2.43e-07 9.28e-07 erg/cm2
Peak flux Band 2.95e-01 3.96e-01 3.25e-01 2.57e-01 1.14e+00 1.28e+00 ph/cm2/s
Error 1.45e-01 1.31e-01 6.96e-02 2.79e-01 2.06e-01 3.88e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.586 0.115 - - 2.49e-03 1.68e-04 68.062 57
CPL 0.315 0.642 67.6 13.1 1.05e-02 8.51e-03 52.748 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.338 0.367 - - 9.73e-03 2.06e-03 42.778 57
CPL 0.686 1.847 113.3 5000.0 1.93e-02 7.25e-02 42.239 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: 124.544000 sec.
T50 in the 50-300 keV band: 31.232000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 136.280 -60.540 75.740
T90 122.788 -52.760 70.028
T50 48.168 -16.776 31.392
Peak 1.000 3.752 4.752
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
231.1448 -22.7386 0.0111 41.5 15.3 4.0335 17.4 TRIG_00303105
------------------------------------------
Foreground time interval of the image:
-60.540 34.569 (delta_t = 95.109 [sec])
Background time interval of the image:
-239.032 -60.540 (delta_t = 178.492 [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 -60.540 sec. to 75.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58600 ( -0.115110 0.115619 )
Norm@50keV : 2.489657E-03 ( -1.685442E-04 1.682404E-04) )
------------------------------------------------------------
Chi-Squared = 68.06194 using 59 PHA bins.
Reduced chi-squared = 1.194069 for 57 degrees of freedom
Null hypothesis probability = 0.150
Photon flux (15-150 keV) in 136.3 sec: 0.318563 ( -0.022758 0.022846 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17917e-06 ( -2.25999e-07 2.26735e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -60.540 sec. to 75.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.314610 ( -0.687950 0.596162 )
Epeak [keV] : 67.5858 ( -8.82653 17.4722 )
Norm@50keV : 1.046667E-02 ( -5.057440E-03 1.196619E-02) )
------------------------------------------------------------
Chi-Squared = 52.74762 using 59 PHA bins.
Reduced chi-squared = 0.9419218 for 56 degrees of freedom
Null hypothesis probability = 0.599
Photon flux (15-150 keV) in 136.3 sec: 0.298893 ( -0.024219 0.024411 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94537e-06 ( -2.52891e-07 2.54472e-07 ) ergs/cm2
Band function
Time interval is from -60.540 sec. to 75.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.114519 ( -0.723301 2.25076 )
beta : -2.50312 ( -7.49688 0.630929 )
Epeak [keV] : 62.7358 ( -20.9142 18.9506 )
Norm@50keV : 1.364045E-02 ( -1.364045E-02 0.343809 )
------------------------------------------------------------
Chi-Squared = 52.09095 using 59 PHA bins.
Reduced chi-squared = 0.9471081 for 55 degrees of freedom
Null hypothesis probability = 0.586
Photon flux (15-150 keV) in 136.3 sec: 0.296494 ( -0.023804 0.025403 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95498e-06 ( -2.33346e-07 2.53109e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.752 sec. to 4.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33806 ( -0.372616 0.360697 )
Norm@50keV : 9.728195E-03 ( -2.062434E-03 2.057494E-03) )
------------------------------------------------------------
Chi-Squared = 42.77782 using 59 PHA bins.
Reduced chi-squared = 0.7504880 for 57 degrees of freedom
Null hypothesis probability = 0.919
Photon flux (15-150 keV) in 1.000 sec: 1.16917 ( -0.267103 0.27042 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.53247e-08 ( -2.0891e-08 2.08773e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.752 sec. to 4.752 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.686122 ( -2.01738 1.67665 )
Epeak [keV] : 113.347 ( -113.337 9886.65 )
Norm@50keV : 1.934916E-02 ( -1.934916E-02 0.125593 )
------------------------------------------------------------
Chi-Squared = 42.23852 using 59 PHA bins.
but latest trial 2.36254 gives Chi-Squared = 1.95950
Reduced chi-squared = 0.7542593 for 56 degrees of freedom
Null hypothesis probability = 0.913
Photon flux (15-150 keV) in 1.000 sec: 1.13967 ( -0.273697 0.27732 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.34046e-08 ( -2.20761e-08 2.15604e-08 ) ergs/cm2
Band function
Time interval is from 3.752 sec. to 4.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.720026 ( -9.27997 1.10045 )
beta : -2.53609 ( -7.46391 12.4957 )
Epeak [keV] : 117.216 ( -117.116 9882.78 )
Norm@50keV : 1.859594E-02 ( -1.859594E-02 4.103264E-02) )
------------------------------------------------------------
Chi-Squared = 42.24002 using 59 PHA bins.
Reduced chi-squared = 0.7680004 for 55 degrees of freedom
Null hypothesis probability = 0.896
Photon flux (15-150 keV) in 1.000 sec: 1.13825 ( -0.266765 0.14463 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.32726e-08 ( -2.20213e-08 2.16134e-08 ) ergs/cm2
Plot creation:
Wed Feb 13 05:11:03 EST 2008