batgrbproduct Analysis for Trigger=313954
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 Jun 16 13:21:38 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger313954/SDC
======================================================================
Trigger: 00313954 Segment: 000
BAT Trigger Time: 235048360.832 [s; MET]
Trigger Stop: 235048361.088 [s; MET]
UTC: 2008-06-13T11:12:37.968880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 173.79663866518 Dec: -7.09837558340558 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.32
Image Trigger?: NO
Rate S/N Ratio: 57.0087712549569 [ if not an image trigger ]
Image S/N Ratio: 11.32
Flight Position: [ source = BAT ]
RA: 173.79663866518 Dec: -7.09837558340558 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 173.803732587718 Dec: -7.10284254566892 [deg; J2000]
{ 11h 35m 12.9s , -07d 06' 10.2" }
+/- 0.586849751359351 [arcmin] (estimated 90% radius based on SNR)
+/- 0.195845376599898 [arcmin] (formal 1-sigma fit error)
SNR: 65.1319681061261
Angular difference between Flight and Ground position is 0.500231 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 103.923999994993 +/- 34.3300104711878
Measured from: -1.21199998259544
to: 102.712000012398 [s; relative to TRIGTIME]
T50: 28.6720000207424 +/- 2.87971389830405
Measured from: 7.18000000715256
to: 35.852000027895 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.22800001502037
to: 3.22800001502037 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.283999979496
to: 236.524000018835 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.245930 3.278172 2.630919 0.791917
0.077417 0.078733 0.070784 0.062738 [error]
Peak 0.061003 0.108280 0.137990 0.056869
0.006388 0.007318 0.007519 0.006569 [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 6.96e-07 1.35e-06 2.03e-06 6.58e-06 5.70e-06 1.07e-05 erg/cm2
Error 4.17e-08 4.61e-08 7.28e-08 5.53e-07 1.78e-07 5.88e-07 erg/cm2
Peak flux Power-law 5.14e-01 7.80e-01 8.87e-01 1.92e+00 2.75e+00 4.10e+00 ph/cm2/s
Error 7.20e-02 6.58e-02 5.81e-02 2.84e-01 1.76e-01 3.04e-01 ph/cm2/s
Fluence Cutoff-PL 6.95e-07 1.35e-06 2.03e-06 6.53e-06 5.70e-06 1.06e-05 erg/cm2
Error 4.17e-08 4.62e-08 7.29e-08 5.49e-07 1.78e-07 5.85e-07 erg/cm2
Peak flux Cutoff-PL 5.13e-01 7.80e-01 8.88e-01 1.91e+00 2.75e+00 4.09e+00 ph/cm2/s
Error 7.20e-02 6.58e-02 5.82e-02 2.82e-01 1.76e-01 3.03e-01 ph/cm2/s
Fluence Band 6.58e-07 1.37e-06 2.02e-06 6.38e-06 5.65e-06 1.04e-05 erg/cm2
Error 6.58e-08 5.23e-08 5.43e-08 5.68e-07 1.91e-07 6.53e-07 erg/cm2
Peak flux Band 4.93e-01 7.84e-01 9.03e-01 1.66e+00 2.74e+00 3.84e+00 ph/cm2/s
Error 9.11e-02 6.83e-02 7.36e-02 5.61e-01 1.81e-01 5.81e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.413 0.056 - - 2.45e-03 7.12e-05 74.150 57
CPL 1.327 0.000 425.2 0.0 2.66e-03 7.15e-05 74.799 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.814 0.114 - - 2.40e-02 1.55e-03 54.943 57
CPL 0.674 0.361 566.8 5000.0 2.75e-02 1.14e-02 54.629 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: 50.432000 sec.
T50 in the 50-300 keV band: 19.520000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 241.808 -5.284 236.524
T90 103.924 -1.212 102.712
T50 28.672 7.180 35.852
Peak 1.000 2.228 3.228
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
173.8037 -7.1028 0.0029 24.2 4.6 4.2391 65.1 TRIG_00313954
------------------------------------------
Foreground time interval of the image:
-5.284 16.773 (delta_t = 22.057 [sec])
Background time interval of the image:
-239.832 -5.284 (delta_t = 234.548 [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 -5.284 sec. to 236.524 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41304 ( -5.633187E-02 5.624282E-02) )
Norm@50keV : 2.445371E-03 ( -7.122010E-05 7.122010E-05) )
------------------------------------------------------------
Chi-Squared = 74.14983 using 59 PHA bins.
Reduced chi-squared = 1.300874 for 57 degrees of freedom
Null hypothesis probability = 6.305E-02
Photon flux (15-150 keV) in 241.8 sec: 0.298694 ( -0.009496 0.009535 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69848e-06 ( -1.77916e-07 1.78569e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.284 sec. to 236.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32744 ( )
Epeak [keV] : 425.180 ( )
Norm@50keV : 2.664058E-03 ( -7.114559E-05 7.181545E-05) )
------------------------------------------------------------
Chi-Squared = 74.79877 using 59 PHA bins.
Reduced chi-squared = 1.335692 for 56 degrees of freedom
Null hypothesis probability = 4.739E-02
Photon flux (15-150 keV) in 241.8 sec: 0.298546 ( -0.009492 0.00953 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69901e-06 ( -1.78062e-07 1.78545e-07 ) ergs/cm2
Band function
Time interval is from -5.284 sec. to 236.524 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.943992 ( -10.0308 2.65867 )
beta : -1.43639 ( -7.832420E-02 6.567371E-02) )
Epeak [keV] : 72.1949 ( -37.1811 609.981 )
Norm@50keV : 4.897789E-03 ( -1.647272E-02 158.534 )
------------------------------------------------------------
Chi-Squared = 72.87495 using 59 PHA bins.
Reduced chi-squared = 1.324999 for 55 degrees of freedom
Null hypothesis probability = 5.366E-02
Photon flux (15-150 keV) in 241.8 sec: 0.294710 ( -0.011407 0.005571 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.65188e-06 ( -1.8974e-07 1.91385e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.228 sec. to 3.228 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.814194 ( -0.115054 0.112413 )
Norm@50keV : 2.398002E-02 ( -1.557495E-03 1.548614E-03) )
------------------------------------------------------------
Chi-Squared = 54.94322 using 59 PHA bins.
Reduced chi-squared = 0.9639161 for 57 degrees of freedom
Null hypothesis probability = 0.553
Photon flux (15-150 keV) in 1.000 sec: 2.75482 ( -0.17581 0.17601 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.7857e-07 ( -1.8927e-08 1.904e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.228 sec. to 3.228 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.674066 ( -0.482996 0.239958 )
Epeak [keV] : 566.837 ( -566.827 9433.16 )
Norm@50keV : 2.752966E-02 ( -6.779529E-03 1.601771E-02) )
------------------------------------------------------------
Chi-Squared = 54.62928 using 59 PHA bins.
but latest trial 2.427116E-02 gives Chi-Squared = 0.305809
Reduced chi-squared = 0.9755228 for 56 degrees of freedom
Null hypothesis probability = 0.527
Photon flux (15-150 keV) in 1.000 sec: 2.75412 ( -0.17576 0.17597 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77027e-07 ( -1.8508e-08 1.9536e-08 ) ergs/cm2
Band function
Time interval is from 2.228 sec. to 3.228 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.836893 ( -9.16311 5.83689 )
beta : -0.814194 ( -0.112406 0.115105 )
Epeak [keV] : 14.7009 ( -14.6009 9985.30 )
Norm@50keV : 3.536689E-02 ( -1.179882E-02 50912.1 )
------------------------------------------------------------
Chi-Squared = 54.94320 using 59 PHA bins.
Reduced chi-squared = 0.9989673 for 55 degrees of freedom
Null hypothesis probability = 0.477
Photon flux (15-150 keV) in 1.000 sec: 2.73979 ( -0.18161 0.18055 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76914e-07 ( -1.9848e-08 1.9612e-08 ) ergs/cm2
Plot creation:
Mon Jun 16 13:54:26 EDT 2008