batgrbproduct Analysis for Trigger=106415
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 20:58:22 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger106415/SDC
======================================================================
Trigger: 00106415 Segment: 000
BAT Trigger Time: 130509600.448 [s; MET]
Trigger Stop: 130509601.472 [s; MET]
UTC: 2005-02-19T12:40:01.049120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.429163614216 Dec: -40.6800821105552 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: NO
Rate S/N Ratio: 14.6969384566991 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 166.429163614216 Dec: -40.6800821105552 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 166.414224554364 Dec: -40.6763673487375 [deg; J2000]
{ 11h 05m 39.4s , -40d 40' 34.9" }
+/- 0.883174783726099 [arcmin] (estimated 90% radius based on SNR)
+/- 0.293370348824803 [arcmin] (formal 1-sigma fit error)
SNR: 36.3240762832966
RA = 11h 5m 39.4s (166.414225 deg.)
Dec = -40d 40' 35" (-40.676367 deg.)
Angular difference between Flight and Ground position is 0.715379 arcmin
Partial Coding Fraction: 0.2324219 [ including projection effects ]
Duration
T90: 23.7440000027418 +/- 1.85148588672307
Measured from: -3.54799999296665
to: 20.1960000097752 [s; relative to TRIGTIME]
T50: 10.0480000078678 +/- 0.788243609689543
Measured from: 3.304000005126
to: 13.3520000129938 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.54000000655651
to: 10.5400000065565 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.80799999833107
to: 29.3159999996424 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.053638 2.146520 2.157160 0.364716
0.059125 0.065976 0.059521 0.045519 [error]
Peak 0.080699 0.140880 0.160689 0.037616
0.011003 0.013716 0.013349 0.009127 [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 4.60e-07 9.53e-07 1.54e-06 5.56e-06 4.26e-06 8.42e-06 erg/cm2
Error 3.18e-08 3.99e-08 5.78e-08 4.59e-07 1.49e-07 5.08e-07 erg/cm2
Peak flux Power-law 9.17e-01 1.12e+00 9.82e-01 1.49e+00 3.53e+00 4.50e+00 ph/cm2/s
Error 1.66e-01 1.27e-01 1.01e-01 3.11e-01 3.49e-01 4.36e-01 ph/cm2/s
Fluence Cutoff-PL 3.33e-07 1.02e-06 1.75e-06 1.84e-06 4.11e-06 4.89e-06 erg/cm2
Error 3.99e-08 4.65e-08 7.75e-08 4.15e-07 1.58e-07 4.29e-07 erg/cm2
Peak flux Cutoff-PL 7.93e-01 1.16e+00 1.07e+00 9.29e-01 3.50e+00 3.95e+00 ph/cm2/s
Error 2.06e-01 1.43e-01 1.38e-01 4.82e-01 3.52e-01 5.88e-01 ph/cm2/s
Fluence Band 3.32e-07 1.01e-06 1.75e-06 1.85e-06 4.10e-06 4.95e-06 erg/cm2
Error 3.94e-08 4.63e-08 7.73e-08 4.13e-07 1.58e-07 4.54e-07 erg/cm2
Peak flux Band 7.93e-01 1.16e+00 1.07e+00 9.30e-01 3.50e+00 3.95e+00 ph/cm2/s
Error 2.05e-01 1.43e-01 1.38e-01 4.88e-01 3.52e-01 5.91e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.311 0.058 - - 1.23e-02 4.26e-04 103.366 57
CPL 0.105 0.308 91.8 9.9 4.11e-02 1.25e-02 45.508 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.183 0.153 - - 3.02e-02 2.86e-03 48.233 57
CPL 0.607 0.649 142.0 4953.3 5.46e-02 3.95e-02 45.553 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: 21.696000 sec.
T50 in the 50-300 keV band: 9.408000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 35.124 -5.808 29.316
T90 23.744 -3.548 20.196
T50 10.048 3.304 13.352
Peak 1.000 9.540 10.540
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
166.4142 -40.6764 0.0052 43.1 -133.5 4.7937 36.3 TRIG_00106415
------------------------------------------
Foreground time interval of the image:
-5.808 14.957 (delta_t = 20.765 [sec])
Background time interval of the image:
-299.448 -5.808 (delta_t = 293.640 [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 -5.808 sec. to 29.316 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31054 ( -5.780125E-02 5.746460E-02) )
Norm@50keV : 1.229844E-02 ( -4.260093E-04 4.256740E-04) )
------------------------------------------------------------
Chi-Squared = 103.3664 using 59 PHA bins.
Reduced chi-squared = 1.813446 for 57 degrees of freedom
Null hypothesis probability = 1.680E-04
Photon flux (15-150 keV) in 35.12 sec: 1.47012 ( -0.05576 0.05594 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.25798e-06 ( -1.49646e-07 1.48839e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.808 sec. to 29.316 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.105198 ( -0.319221 0.297655 )
Epeak [keV] : 91.7825 ( -8.03968 11.8273 )
Norm@50keV : 4.111040E-02 ( -1.029941E-02 1.475585E-02) )
------------------------------------------------------------
Chi-Squared = 45.50836 using 59 PHA bins.
Reduced chi-squared = 0.8126493 for 56 degrees of freedom
Null hypothesis probability = 0.841
Photon flux (15-150 keV) in 35.12 sec: 1.38676 ( -0.05815 0.05861 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.10598e-06 ( -1.57513e-07 1.58778e-07 ) ergs/cm2
Band function
Time interval is from -5.808 sec. to 29.316 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.105432 ( -0.297157 0.319630 )
beta : -9.25942 ( -0.740577 7.14462 )
Epeak [keV] : 91.7716 ( -8.05515 11.7947 )
Norm@50keV : 4.110621E-02 ( -1.029245E-02 1.477893E-02) )
------------------------------------------------------------
Chi-Squared = 45.50910 using 59 PHA bins.
Reduced chi-squared = 0.8274382 for 55 degrees of freedom
Null hypothesis probability = 0.816
Photon flux (15-150 keV) in 35.12 sec: 1.38684 ( -0.05823 0.05842 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.10493e-06 ( -1.57548e-07 1.57478e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 9.540 sec. to 10.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18294 ( -0.153575 0.151565 )
Norm@50keV : 3.018356E-02 ( -2.858555E-03 2.852233E-03) )
------------------------------------------------------------
Chi-Squared = 48.23327 using 59 PHA bins.
Reduced chi-squared = 0.8461978 for 57 degrees of freedom
Null hypothesis probability = 0.789
Photon flux (15-150 keV) in 1.000 sec: 3.53465 ( -0.34892 0.34955 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.0767e-07 ( -3.062e-08 3.0764e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.540 sec. to 10.540 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.607337 ( -0.702466 0.594645 )
Epeak [keV] : 141.966 ( -48.6533 9858.03 )
Norm@50keV : 5.461834E-02 ( -2.489481E-02 5.403746E-02) )
------------------------------------------------------------
Chi-Squared = 45.55317 using 59 PHA bins.
but latest trial 3.033535E-02 gives Chi-Squared = 2.63168
Reduced chi-squared = 0.8134495 for 56 degrees of freedom
Null hypothesis probability = 0.839
Photon flux (15-150 keV) in 1.000 sec: 3.49544 ( -0.35205 0.35151 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06609e-07 ( -3.1429e-08 3.1327e-08 ) ergs/cm2
Band function
Time interval is from 9.540 sec. to 10.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.604917 ( -0.628178 0.700068 )
beta : -8.21137 ( -1.78863 7.06755 )
Epeak [keV] : 141.553 ( -141.453 9858.45 )
Norm@50keV : 5.476032E-02 ( -2.430136E-02 5.392212E-02) )
------------------------------------------------------------
Chi-Squared = 45.55320 using 59 PHA bins.
Reduced chi-squared = 0.8282399 for 55 degrees of freedom
Null hypothesis probability = 0.814
Photon flux (15-150 keV) in 1.000 sec: 3.49558 ( -0.35195 0.35253 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06433e-07 ( -3.143e-08 3.1302e-08 ) ergs/cm2
Plot creation:
Fri Jan 4 21:09:10 EST 2008