batgrbproduct Analysis for Trigger=208169
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 Dec 31 21:20:33 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger208169/SDC
======================================================================
Trigger: 00208169 Segment: 000
BAT Trigger Time: 168231813.312 [s; MET]
Trigger Stop: 168231814.336 [s; MET]
UTC: 2006-05-02T03:03:32.144320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 240.857822844256 Dec: 66.5949806915925 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.69
Image Trigger?: NO
Rate S/N Ratio: 24.5560583156173 [ if not an image trigger ]
Image S/N Ratio: 12.69
Flight Position: [ source = BAT ]
RA: 240.857822844256 Dec: 66.5949806915925 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 240.922856932829 Dec: 66.6003561820521 [deg; J2000]
{ 16h 03m 41.5s , +66d 36' 01.3" }
+/- 0.805300174374127 [arcmin] (estimated 90% radius based on SNR)
+/- 0.286970876133445 [arcmin] (formal 1-sigma fit error)
SNR: 41.4442600208749
RA = 16h 3m 41.5s (240.922857 deg.)
Dec = 66d 36' 1" (66.600356 deg.)
Angular difference between Flight and Ground position is 1.583039 arcmin
Partial Coding Fraction: 0.4921875 [ including projection effects ]
Duration
T90: 28.4360000193119 +/- 9.82783800045578
Measured from: -3.71200001239777
to: 24.7240000069141 [s; relative to TRIGTIME]
T50: 10.6920000016689 +/- 0.822571573173059
Measured from: 0.780000001192093
to: 11.472000002861 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.124000012874603
to: 0.875999987125397 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.64399999380112
to: 38.9839999973774 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.868813 1.269822 1.042163 0.245698
0.046626 0.047695 0.041179 0.032112 [error]
Peak 0.033778 0.065288 0.089398 0.031699
0.007899 0.008238 0.008154 0.006043 [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 3.00e-07 5.62e-07 8.13e-07 2.50e-06 2.31e-06 4.16e-06 erg/cm2
Error 2.52e-08 2.77e-08 4.13e-08 2.88e-07 1.02e-07 3.10e-07 erg/cm2
Peak flux Power-law 3.65e-01 5.03e-01 5.13e-01 9.54e-01 1.69e+00 2.34e+00 ph/cm2/s
Error 9.43e-02 7.98e-02 6.13e-02 2.49e-01 2.09e-01 2.86e-01 ph/cm2/s
Fluence Cutoff-PL 2.81e-07 5.73e-07 8.36e-07 1.74e-06 2.28e-06 3.43e-06 erg/cm2
Error 3.19e-08 3.10e-08 4.85e-08 6.95e-07 1.09e-07 6.73e-07 erg/cm2
Peak flux Cutoff-PL 3.35e-01 5.08e-01 5.34e-01 7.51e-01 1.67e+00 2.13e+00 ph/cm2/s
Error 1.19e-01 8.39e-02 8.31e-02 4.08e-01 2.12e-01 4.55e-01 ph/cm2/s
Fluence Band 2.73e-07 5.75e-07 8.27e-07 2.10e-06 2.27e-06 3.79e-06 erg/cm2
Error 3.39e-08 3.44e-08 5.14e-08 7.67e-07 1.10e-07 8.13e-07 erg/cm2
Peak flux Band 3.31e-01 5.12e-01 5.33e-01 8.44e-01 1.67e+00 2.22e+00 ph/cm2/s
Error 9.27e-02 8.95e-02 8.27e-02 2.75e-01 2.17e-01 3.13e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.467 0.077 - - 5.42e-03 2.29e-04 55.764 57
CPL 1.177 0.318 156.9 4949.5 7.38e-03 2.52e-03 53.223 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.971 0.206 - - 1.47e-02 1.78e-03 74.682 57
CPL 0.728 0.711 324.7 5000.0 1.85e-02 1.65e-02 74.351 56
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: 17.792000 sec.
T50 in the 50-300 keV band: 7.552000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 44.628 -5.644 38.984
T90 28.436 -3.712 24.724
T50 10.692 0.780 11.472
Peak 1.000 -0.124 0.876
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
240.9229 +66.6004 0.0046 34.9 -131.8 3.2323 41.4 TRIG_00208169
------------------------------------------
Foreground time interval of the image:
-5.644 15.093 (delta_t = 20.737 [sec])
Background time interval of the image:
-210.707 -5.644 (delta_t = 205.063 [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 -5.644 sec. to 38.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46655 ( -7.755351E-02 7.732153E-02) )
Norm@50keV : 5.421254E-03 ( -2.291058E-04 2.291063E-04) )
------------------------------------------------------------
Chi-Squared = 55.76434 using 59 PHA bins.
Reduced chi-squared = 0.9783217 for 57 degrees of freedom
Null hypothesis probability = 0.522
Photon flux (15-150 keV) in 44.63 sec: 0.670882 ( -0.031322 0.031433 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30853e-06 ( -1.02243e-07 1.02404e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.644 sec. to 38.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17750 ( -0.331780 0.304990 )
Epeak [keV] : 156.874 ( -55.8840 9843.13 )
Norm@50keV : 7.376982E-03 ( -2.002862E-03 3.031228E-03) )
------------------------------------------------------------
Chi-Squared = 53.22348 using 59 PHA bins.
Reduced chi-squared = 0.9504194 for 56 degrees of freedom
Null hypothesis probability = 0.581
Photon flux (15-150 keV) in 44.63 sec: 0.659814 ( -0.016927 0.033261 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27691e-06 ( -1.10736e-07 1.0788e-07 ) ergs/cm2
Band function
Time interval is from -5.644 sec. to 38.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05348 ( -0.397959 2.27611 )
beta : -1.67187 ( -8.32813 0.227152 )
Epeak [keV] : 115.628 ( -91.1056 883.042 )
Norm@50keV : 8.622109E-03 ( -3.061322E-03 1.409078E-02) )
------------------------------------------------------------
Chi-Squared = 52.91591 using 59 PHA bins.
Reduced chi-squared = 0.9621075 for 55 degrees of freedom
Null hypothesis probability = 0.555
Photon flux (15-150 keV) in 44.63 sec: 0.657366 ( -0.034171 0.03408 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26774e-06 ( -1.0995e-07 1.09406e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.124 sec. to 0.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.971280 ( -0.210176 0.201959 )
Norm@50keV : 1.466508E-02 ( -1.790461E-03 1.767475E-03) )
------------------------------------------------------------
Chi-Squared = 74.68172 using 59 PHA bins.
Reduced chi-squared = 1.310206 for 57 degrees of freedom
Null hypothesis probability = 5.805E-02
Photon flux (15-150 keV) in 1.000 sec: 1.68630 ( -0.20871 0.20932 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60214e-07 ( -1.9252e-08 1.9311e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.124 sec. to 0.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.728108 ( -0.993693 0.428028 )
Epeak [keV] : 324.740 ( -324.730 9675.26 )
Norm@50keV : 1.853112E-02 ( -5.461087E-03 2.756659E-02) )
------------------------------------------------------------
Chi-Squared = 74.35052 using 59 PHA bins.
Reduced chi-squared = 1.327688 for 56 degrees of freedom
Null hypothesis probability = 5.096E-02
Photon flux (15-150 keV) in 1.000 sec: 1.67230 ( -0.2118 0.21284 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59777e-07 ( -1.9207e-08 1.9552e-08 ) ergs/cm2
Band function
Time interval is from -0.124 sec. to 0.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.778062 ( -9.22194 5.77806 )
beta : -0.971286 ( -8.81758 0.405767 )
Epeak [keV] : 65.1652 ( -198.911 9800.99 )
Norm@50keV : 2.414022E-02 ( -9.208518E-03 282526. )
------------------------------------------------------------
Chi-Squared = 74.68173 using 59 PHA bins.
Reduced chi-squared = 1.357850 for 55 degrees of freedom
Null hypothesis probability = 3.987E-02
Photon flux (15-150 keV) in 1.000 sec: 1.66527 ( -0.21653 0.21838 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59743e-07 ( -1.9643e-08 1.9497e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 21:42:52 EST 2007