batgrbproduct Analysis for Trigger=131160
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): Sun Jan 6 18:48:50 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger131160/SDC
======================================================================
Trigger: 00131160 Segment: 000
BAT Trigger Time: 139295846.08 [s; MET]
Trigger Stop: 139295862.464 [s; MET]
UTC: 2005-06-01T05:17:26.529500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.529 Dec: -40.555 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9
Image Trigger?: NO
Rate S/N Ratio: 16.5227116418583 [ if not an image trigger ]
Image S/N Ratio: 9
Flight Position: [ source = BAT ]
RA: 135.529 Dec: -40.555 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.545966585703 Dec: -40.558972540055 [deg; J2000]
{ 09h 02m 11.0s , -40d 33' 32.3" }
+/- 3.7127399296989 [arcmin] (estimated 90% radius based on SNR)
+/- 2.06274021022439 [arcmin] (formal 1-sigma fit error)
SNR: 4.66948573647176
RA = 9h 2m 11.0s (135.545967 deg.)
Dec = -40d 33' 32" (-40.558973 deg.)
Angular difference between Flight and Ground position is 0.809326 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 0.0399999916553497 +/- 0.0144222095322683
Measured from: -79.9320000112057
to: -79.8920000195503 [s; relative to TRIGTIME]
T50: 0.0320000052452087 +/- 0.0226274207068922
Measured from: -79.9280000030994
to: -79.8959999978542 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -80.4080000221729
to: -79.4080000221729 [s; relative to TRIGTIME]
Total Fluence
Measured from: -79.9320000112057
to: -79.8880000114441 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.003488 0.004007 0.001387 0.001382
0.001178 0.001183 0.001015 0.000956 [error]
Peak 0.003880 0.003744 0.000916 0.001295
0.001242 0.001225 0.001044 0.000986 [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 7.61e-10 2.45e-10 4.39e-11 9.18e-12 1.05e-09 1.06e-09 erg/cm2
Error 4.86e-10 1.43e-10 3.17e-11 9.57e-12 8.45e-10 8.48e-10 erg/cm2
Peak flux Power-law 6.29e-01 1.11e-01 9.36e-03 8.52e-04 7.50e-01 7.50e-01 ph/cm2/s
Error 2.81e-01 8.60e-02 6.75e-03 8.79e-04 4.30e-01 4.30e-01 ph/cm2/s
Fluence Cutoff-PL 7.84e-10 1.80e-09 5.85e-10 9.22e-12 3.18e-09 3.20e-09 erg/cm2
Error 5.78e-10 7.44e-10 4.49e-10 1.01e-11 1.19e-09 1.19e-09 erg/cm2
Peak flux Cutoff-PL 6.29e-01 1.11e-01 9.38e-03 8.51e-04 7.50e-01 7.50e-01 ph/cm2/s
Error 3.72e-01 8.62e-02 6.76e-03 8.78e-04 4.30e-01 4.30e-01 ph/cm2/s
Fluence Band 8.46e-10 1.69e-09 4.81e-10 8.81e-12 3.05e-09 3.03e-09 erg/cm2
Error 5.11e-10 6.56e-10 3.90e-10 9.14e-12 1.15e-09 1.16e-09 erg/cm2
Peak flux Band 6.43e-01 5.92e-01 9.17e-02 1.01e-03 1.36e+00 1.33e+00 ph/cm2/s
Error 3.85e-01 2.47e-01 1.06e-03 5.65e-01 5.48e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.479 0.738 - - 7.53e-04 6.15e-04 45.190 57
CPL -2.286 1.756 34.9 9.7 5.44e+00 5.08e+00 33.237 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.568 0.750 - - 7.29e-04 5.92e-04 44.589 57
CPL -1.561 2.230 31.9 15.0 2.40e+00 5.26e+00 35.987 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.044 -79.932 -79.888
T90 0.040 -79.932 -79.892
T50 0.032 -79.928 -79.896
Peak 1.000 -80.408 -79.408
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.5460 -40.5590 0.0411 33.4 -4.0 0.0100 4.7 TRIG_00131160
------------------------------------------
Foreground time interval of the image:
-79.932 -79.888 (delta_t = 0.044 [sec])
Background time interval of the image:
-299.080 -79.932 (delta_t = 219.148 [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 -79.932 sec. to -79.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.47870 ( -0.571897 0.903610 )
Norm@50keV : 7.527223E-04 ( -7.527223E-04 4.770121E-04) )
------------------------------------------------------------
Chi-Squared = 45.18993 using 59 PHA bins.
Reduced chi-squared = 0.7928058 for 57 degrees of freedom
Null hypothesis probability = 0.871
Photon flux (15-150 keV) in 4.4000E-02 sec: 0.712717 ( -0.445424 0.443633 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05403e-09 ( -1.05403e-09 6.36416e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from -79.932 sec. to -79.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.28559 ( -0.714408 2.79689 )
Epeak [keV] : 34.8818 ( -15.1664 4.30980 )
Norm@50keV : 5.44052 ( -5.44052 4.71356 )
------------------------------------------------------------
Chi-Squared = 33.23692 using 59 PHA bins.
Reduced chi-squared = 0.5935164 for 56 degrees of freedom
Null hypothesis probability = 0.993
Photon flux (15-150 keV) in 4.4000E-02 sec: 1.43560 ( -0.555272 0.58957 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18049e-09 ( -1.19259e-09 1.18741e-09 ) ergs/cm2
Band function
Time interval is from -79.932 sec. to -79.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04468 ( -6.296158E-03 6.314278E-03) )
beta : -5.44339 ( -0.906019 14.4764 )
Epeak [keV] : 78.3078 ( -78.2078 9921.69 )
Norm@50keV : 9.878463E-05 ( -7.087095E-02 6.474893E-02) )
------------------------------------------------------------
Chi-Squared = 52.04436 using 59 PHA bins.
Reduced chi-squared = 0.9462610 for 55 degrees of freedom
Null hypothesis probability = 0.588
Photon flux (15-150 keV) in 4.4000E-02 sec: 1.42132 ( -0.549517 0.59077 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.04623e-09 ( -1.12986e-09 1.17609e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -79.932 sec. to -79.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.56769 ( -0.535826 0.964961 )
Norm@50keV : 7.293192E-04 ( -7.293192E-04 4.551175E-04) )
------------------------------------------------------------
Chi-Squared = 44.58910 using 59 PHA bins.
Reduced chi-squared = 0.7822648 for 57 degrees of freedom
Null hypothesis probability = 0.884
Photon flux (15-150 keV) in 4.8000E-02 sec: 0.749517 ( -0.431777 0.428983 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19817e-09 ( -6.72211e-10 6.68683e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from -79.932 sec. to -79.884 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.56105 ( -1.43895 3.02173 )
Epeak [keV] : 31.9338 ( -22.8312 7.19930 )
Norm@50keV : 2.39728 ( -2.39728 8.13087 )
------------------------------------------------------------
Chi-Squared = 35.98661 using 59 PHA bins.
but latest trial 9.32704 gives Chi-Squared = 1.82098
Reduced chi-squared = 0.6426181 for 56 degrees of freedom
Null hypothesis probability = 0.983
Photon flux (15-150 keV) in 4.8000E-02 sec: 0.749745 ( -0.431645 0.429015 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10209e-09 ( -1.2544e-09 1.25306e-09 ) ergs/cm2
Band function
Time interval is from -79.932 sec. to -79.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.76522 ( -0.421228 4.12762 )
beta : -4.56759 ( -0.168890 3.51701 )
Epeak [keV] : 28.4878 ( -14.8954 18.7689 )
Norm@50keV : 9.911018E-02 ( -2.21155 176.557 )
------------------------------------------------------------
Chi-Squared = 44.58910 using 59 PHA bins.
Reduced chi-squared = 0.8107108 for 55 degrees of freedom
Null hypothesis probability = 0.841
Photon flux (15-150 keV) in 4.8000E-02 sec: 1.35635 ( -0.567004 0.56378 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96359e-09 ( -1.16018e-09 1.27601e-09 ) ergs/cm2
Plot creation:
Sun Jan 6 19:08:31 EST 2008