batgrbproduct Analysis for Trigger=106709
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 21:17:43 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger106709/SDC
======================================================================
Trigger: 00106709 Segment: 000
BAT Trigger Time: 130820945.472 [s; MET]
Trigger Stop: 130820953.664 [s; MET]
UTC: 2005-02-23T03:09:06.068200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.381776797387 Dec: -62.4986306585262 [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: 11.2694276695846 [ if not an image trigger ]
Image S/N Ratio: 9
Flight Position: [ source = BAT ]
RA: 271.381776797387 Dec: -62.4986306585262 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 271.393319362781 Dec: -62.4683915292439 [deg; J2000]
{ 18h 05m 34.4s , -62d 28' 06.2" }
+/- 1.52608686607632 [arcmin] (estimated 90% radius based on SNR)
+/- 0.45006826048845 [arcmin] (formal 1-sigma fit error)
SNR: 16.6288532944173
RA = 18h 5m 34.4s (271.393319 deg.)
Dec = -62d 28' 6" (-62.468392 deg.)
Angular difference between Flight and Ground position is 1.842345 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 22.5280000120401 +/- 4.63988966089465
Measured from: -7.82400000095367
to: 14.7040000110865 [s; relative to TRIGTIME]
T50: 10.4320000112057 +/- 2.13034457487291
Measured from: -0.527999997138977
to: 9.9040000140667 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.56399999558926
to: 2.56399999558926 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.9839999973774
to: 16.5600000023842 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.350759 0.428994 0.249647 0.046784
0.031533 0.032738 0.028868 0.026641 [error]
Peak 0.029131 0.023704 0.021504 0.010845
0.005830 0.006101 0.005475 0.004845 [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 1.23e-07 1.83e-07 2.02e-07 4.20e-07 6.36e-07 9.28e-07 erg/cm2
Error 1.73e-08 1.63e-08 2.82e-08 1.21e-07 6.52e-08 1.47e-07 erg/cm2
Peak flux Power-law 2.79e-01 2.32e-01 1.32e-01 1.10e-01 6.92e-01 7.53e-01 ph/cm2/s
Error 9.96e-02 5.37e-02 4.86e-02 8.18e-02 1.60e-01 1.77e-01 ph/cm2/s
Fluence Cutoff-PL 1.18e-07 1.90e-07 2.03e-07 2.48e-07 6.19e-07 7.80e-07 erg/cm2
Error 1.97e-08 2.17e-08 2.98e-08 2.16e-07 5.45e-08 2.36e-07 erg/cm2
Peak flux Cutoff-PL 2.79e-01 2.33e-01 1.32e-01 1.09e-01 6.92e-01 7.53e-01 ph/cm2/s
Error 9.95e-02 5.38e-02 4.86e-02 8.13e-02 1.60e-01 1.77e-01 ph/cm2/s
Fluence Band 1.17e-07 1.89e-07 2.01e-07 3.13e-07 6.19e-07 8.24e-07 erg/cm2
Error 1.96e-08 2.19e-08 3.13e-08 2.08e-07 7.19e-08 2.27e-07 erg/cm2
Peak flux Band 2.68e-01 2.36e-01 1.33e-01 1.11e-01 6.93e-01 7.58e-01 ph/cm2/s
Error 9.95e-02 6.08e-02 4.32e-02 6.27e-02 1.60e-01 1.38e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.855 0.167 - - 2.42e-03 2.47e-04 59.601 57
CPL 1.440 0.673 62.2 4980.8 4.04e-03 4.49e-03 58.902 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.822 0.458 - - 4.98e-03 1.39e-03 48.770 57
CPL 1.782 0.000 234.7 5000.0 5.26e-03 1.18e-02 48.828 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: 17.216000 sec.
T50 in the 50-300 keV band: 9.472000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 28.544 -11.984 16.560
T90 22.528 -7.824 14.704
T50 10.432 -0.528 9.904
Peak 1.000 1.564 2.564
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.3933 -62.4684 0.0116 36.2 -177.4 1.0950 16.6 TRIG_00106709
------------------------------------------
Foreground time interval of the image:
-11.984 16.560 (delta_t = 28.544 [sec])
Background time interval of the image:
-129.971 -11.984 (delta_t = 117.987 [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 -11.984 sec. to 16.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85530 ( -0.164311 0.169613 )
Norm@50keV : 2.422233E-03 ( -2.488780E-04 2.445809E-04) )
------------------------------------------------------------
Chi-Squared = 59.60106 using 59 PHA bins.
Reduced chi-squared = 1.045633 for 57 degrees of freedom
Null hypothesis probability = 0.381
Photon flux (15-150 keV) in 28.54 sec: 0.341205 ( -0.031064 0.031103 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.35523e-07 ( -6.47772e-08 6.56877e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.984 sec. to 16.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44027 ( -0.646187 0.700603 )
Epeak [keV] : 62.1950 ( -23.8587 9937.80 )
Norm@50keV : 4.044675E-03 ( -4.044675E-03 4.941847E-03) )
------------------------------------------------------------
Chi-Squared = 58.90163 using 59 PHA bins.
Reduced chi-squared = 1.051815 for 56 degrees of freedom
Null hypothesis probability = 0.370
Photon flux (15-150 keV) in 28.54 sec: 0.336558 ( -0.032419 0.032297 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1911e-07 ( -7.28797e-08 3.61516e-08 ) ergs/cm2
Band function
Time interval is from -11.984 sec. to 16.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.53155 ( -8.46845 0.729864 )
beta : -9.28482 ( -0.715183 7.56927 )
Epeak [keV] : 66.4637 ( -18.4797 9933.54 )
Norm@50keV : 3.627225E-03 ( -1.415573E-03 5.274917E-03) )
------------------------------------------------------------
Chi-Squared = 58.84975 using 59 PHA bins.
Reduced chi-squared = 1.069996 for 55 degrees of freedom
Null hypothesis probability = 0.336
Photon flux (15-150 keV) in 28.54 sec: 0.336573 ( -0.032477 0.032339 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18896e-07 ( -7.1467e-08 7.23632e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.584 sec. to 2.544 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82177 ( -0.435669 0.479443 )
Norm@50keV : 4.978003E-03 ( -1.438362E-03 1.342864E-03) )
------------------------------------------------------------
Chi-Squared = 48.76953 using 59 PHA bins.
Reduced chi-squared = 0.8556057 for 57 degrees of freedom
Null hypothesis probability = 0.773
Photon flux (15-150 keV) in 0.9600 sec: 0.691833 ( -0.160243 0.160322 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.39784e-08 ( -1.22106e-08 1.26192e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.584 sec. to 2.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78162 ( )
Epeak [keV] : 234.744 ( -154.530 9845.46 )
Norm@50keV : 5.259052E-03 ( -2.496657E-03 2.104035E-02) )
------------------------------------------------------------
Chi-Squared = 48.82822 using 59 PHA bins.
Reduced chi-squared = 0.8719325 for 56 degrees of freedom
Null hypothesis probability = 0.741
Photon flux (15-150 keV) in 0.9600 sec: 0.691609 ( -0.160199 0.160275 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.39673e-08 ( -1.22163e-08 1.2628e-08 ) ergs/cm2
Band function
Time interval is from 1.584 sec. to 2.544 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18533 ( -8.81467 6.18533 )
beta : -1.85081 ( -8.14919 0.458199 )
Epeak [keV] : 27.5490 ( -27.4490 9972.45 )
Norm@50keV : 1.640841E-02 ( -4.81531 2882.26 )
------------------------------------------------------------
Chi-Squared = 48.69128 using 59 PHA bins.
Reduced chi-squared = 0.8852960 for 55 degrees of freedom
Null hypothesis probability = 0.713
Photon flux (15-150 keV) in 0.9600 sec: 0.692989 ( -0.159723 0.160013 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11561e-08 ( -1.07816e-08 9.89933e-09 ) ergs/cm2
Plot creation:
Fri Jan 4 21:27:20 EST 2008