batgrbproduct Analysis for Trigger=104298
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 20:30:13 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger104298/GCN_download_cron
======================================================================
Trigger: 00104298 Segment: 000
BAT Trigger Time: 129008114.176 [s; MET]
Trigger Stop: 129008114.304 [s; MET]
UTC: 2005-02-02T03:35:14.800740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 290.560534826378 Dec: -38.7202927722526 [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: 17.606816861659 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 290.560534826378 Dec: -38.7202927722526 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 290.583454973384 Dec: -38.7362881691527 [deg; J2000]
{ 19h 22m 20.0s , -38d 44' 10.6" }
+/- 2.27973737913397 [arcmin] (estimated 90% radius based on SNR)
+/- 1.14125407786534 [arcmin] (formal 1-sigma fit error)
SNR: 9.37247630836702
RA = 19h 22m 20.0s (290.583455 deg.)
Dec = -38d 44' 11" (-38.736288 deg.)
Angular difference between Flight and Ground position is 1.439456 arcmin
Partial Coding Fraction: 0.578125 [ including projection effects ]
Duration
T90: 0.112000018358231 +/- 0.0312410085941713
Measured from: 0.0119999945163727
to: 0.124000012874603 [s; relative to TRIGTIME]
T50: 0.0520000010728836 +/- 0.0200000077486047
Measured from: 0.0400000065565109
to: 0.0920000076293945 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.428000003099442
to: 0.571999996900558 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00400000810623169
to: 0.136000007390976 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.010786 0.019845 0.018089 0.002266
0.003310 0.003109 0.002683 0.002034 [error]
Peak 0.010379 0.020405 0.017842 0.001858
0.003347 0.003144 0.002711 0.002069 [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 3.64e-09 7.39e-09 1.17e-08 4.11e-08 3.25e-08 6.39e-08 erg/cm2
Error 1.22e-09 1.49e-09 2.41e-09 1.99e-08 6.07e-09 2.12e-08 erg/cm2
Peak flux Power-law 8.55e-01 9.52e-01 7.58e-01 9.99e-01 2.93e+00 3.56e+00 ph/cm2/s
Error 2.94e-01 2.01e-01 1.53e-01 4.28e-01 5.53e-01 6.37e-01 ph/cm2/s
Fluence Cutoff-PL 3.10e-09 7.90e-09 1.26e-08 1.60e-08 3.13e-08 3.61e-08 erg/cm2
Error 1.53e-09 1.82e-09 2.96e-09 2.70e-08 6.64e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.15e-01 1.01e+00 8.23e-01 4.92e-01 2.84e+00 3.03e+00 ph/cm2/s
Error 3.70e-01 2.37e-01 1.97e-01 6.92e-01 5.80e-01 8.75e-01 ph/cm2/s
Fluence Band 3.03e-09 7.88e-09 1.26e-08 1.59e-08 3.12e-08 3.72e-08 erg/cm2
Error 1.52e-09 1.81e-09 2.96e-09 2.67e-08 6.63e-09 0.00e+00 erg/cm2
Peak flux Band 6.72e-01 1.03e+00 7.98e-01 7.37e-01 2.82e+00 3.24e+00 ph/cm2/s
Error 4.42e-01 2.62e-01 1.90e-01 5.76e-01 5.78e-01 8.29e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.339 0.307 - - 2.52e-02 4.39e-03 58.516 57
CPL 0.516 1.497 97.8 4969.1 6.13e-02 2.20e-01 57.565 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.329 0.311 - - 2.45e-02 4.33e-03 62.171 57
CPL 0.540 1.499 99.9 4975.7 5.77e-02 2.18e-01 61.326 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 0.132 0.004 0.136
T90 0.112 0.012 0.124
T50 0.052 0.040 0.092
Peak 1.000 -0.428 0.572
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
290.5835 -38.7363 0.0204 25.7 -75.5 0.0555 9.4 TRIG_00104298
------------------------------------------
Foreground time interval of the image:
0.004 0.136 (delta_t = 0.132 [sec])
Background time interval of the image:
-299.176 0.004 (delta_t = 299.180 [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 0.004 sec. to 0.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33905 ( -0.310147 0.304696 )
Norm@50keV : 2.516929E-02 ( -4.393354E-03 4.392870E-03) )
------------------------------------------------------------
Chi-Squared = 58.51567 using 59 PHA bins.
Reduced chi-squared = 1.026591 for 57 degrees of freedom
Null hypothesis probability = 0.420
Photon flux (15-150 keV) in 0.1320 sec: 3.02543 ( -0.5597 0.56398 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25414e-08 ( -6.05642e-09 6.07886e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.004 sec. to 0.136 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.516268 ( -1.92876 1.06573 )
Epeak [keV] : 97.7958 ( -36.0727 9902.20 )
Norm@50keV : 6.127794E-02 ( -3.956702E-02 0.400738 )
------------------------------------------------------------
Chi-Squared = 57.56473 using 59 PHA bins.
but latest trial 50.1964 gives Chi-Squared = 7.83109
Reduced chi-squared = 1.027942 for 56 degrees of freedom
Null hypothesis probability = 0.417
Photon flux (15-150 keV) in 0.1320 sec: 2.92021 ( -0.58691 0.58965 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12774e-08 ( -6.74837e-09 6.53268e-09 ) ergs/cm2
Band function
Time interval is from 0.004 sec. to 0.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.579121 ( -9.42088 5.57912 )
beta : -1.99418 ( -8.00582 2.81831 )
Epeak [keV] : 101.430 ( -101.330 606.107 )
Norm@50keV : 5.704320E-02 ( -3.054994E-02 3088.09 )
------------------------------------------------------------
Chi-Squared = 57.47029 using 59 PHA bins.
Reduced chi-squared = 1.044914 for 55 degrees of freedom
Null hypothesis probability = 0.384
Photon flux (15-150 keV) in 0.1320 sec: 2.90189 ( -0.88521 0.57672 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12121e-08 ( -6.6862e-09 6.58271e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.004 sec. to 0.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32915 ( -0.314332 0.307792 )
Norm@50keV : 2.446170E-02 ( -4.327491E-03 4.325373E-03) )
------------------------------------------------------------
Chi-Squared = 62.17076 using 59 PHA bins.
Reduced chi-squared = 1.090715 for 57 degrees of freedom
Null hypothesis probability = 0.297
Photon flux (15-150 keV) in 0.1360 sec: 2.93458 ( -0.55044 0.55471 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26178e-08 ( -6.10613e-09 6.21003e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.004 sec. to 0.140 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.540023 ( -1.95540 1.04196 )
Epeak [keV] : 99.9498 ( -51.4296 9900.05 )
Norm@50keV : 5.768679E-02 ( -3.673849E-02 0.399609 )
------------------------------------------------------------
Chi-Squared = 61.32634 using 59 PHA bins.
but latest trial 45.6672 gives Chi-Squared = 11.1377
Reduced chi-squared = 1.095113 for 56 degrees of freedom
Null hypothesis probability = 0.291
Photon flux (15-150 keV) in 0.1360 sec: 2.84040 ( -0.58016 0.57912 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14421e-08 ( -6.90037e-09 6.63027e-09 ) ergs/cm2
Band function
Time interval is from 0.004 sec. to 0.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 9.209322E-02 ( -10.0921 4.90791 )
beta : -1.70020 ( -8.29980 0.606919 )
Epeak [keV] : 67.7413 ( -67.6413 9886.87 )
Norm@50keV : 0.134000 ( -0.134000 250.806 )
------------------------------------------------------------
Chi-Squared = 61.02086 using 59 PHA bins.
Reduced chi-squared = 1.109470 for 55 degrees of freedom
Null hypothesis probability = 0.268
Photon flux (15-150 keV) in 0.1360 sec: 2.81832 ( -0.579 0.57711 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.13676e-08 ( -6.83482e-09 6.68046e-09 ) ergs/cm2
Plot creation:
Fri Jan 4 20:42:10 EST 2008