batgrbproduct Analysis for Trigger=286373
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 Dec 14 05:35:23 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger286373/SDC
======================================================================
Trigger: 00286373 Segment: 000
BAT Trigger Time: 207361556.032 [s; MET]
Trigger Stop: 207361557.056 [s; MET]
UTC: 2007-07-29T00:25:53.913580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 56.3223396303976 Dec: -39.3118189788734 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.09
Image Trigger?: NO
Rate S/N Ratio: 21.4941852602047 [ if not an image trigger ]
Image S/N Ratio: 7.09
Flight Position: [ source = BAT ]
RA: 56.3223396303976 Dec: -39.3118189788734 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 56.2964293777244 Dec: -39.3296669354477 [deg; J2000]
{ 03h 45m 11.1s , -39d 19' 46.8" }
+/- 2.16370683826063 [arcmin] (estimated 90% radius based on SNR)
+/- 0.857066056155229 [arcmin] (formal 1-sigma fit error)
SNR: 10.09865411585
RA = 3h 45m 11.1s (56.296429 deg.)
Dec = -39d 19' 47" (-39.329667 deg.)
Angular difference between Flight and Ground position is 1.610337 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 0.980000019073486 +/- 0.164048779051544
Measured from: 0.0199999809265137
to: 1 [s; relative to TRIGTIME]
T50: 0.552000015974045 +/- 0.12092972043272
Measured from: 0.215999990701675
to: 0.76800000667572 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0279999971389771
to: 1.02799999713898 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0680000185966492
to: 1.06799998879433 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.025027 0.040409 0.051818 0.020880
0.006438 0.006954 0.006780 0.005943 [error]
Peak 0.019593 0.038831 0.048048 0.021869
0.006070 0.006615 0.006455 0.005645 [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 7.21e-09 1.85e-08 3.83e-08 2.01e-07 1.03e-07 2.65e-07 erg/cm2
Error 2.38e-09 3.65e-09 6.06e-09 7.63e-08 1.62e-08 7.85e-08 erg/cm2
Peak flux Power-law 1.93e-01 2.84e-01 3.10e-01 6.37e-01 9.82e-01 1.42e+00 ph/cm2/s
Error 6.89e-02 6.18e-02 4.82e-02 2.21e-01 1.60e-01 2.38e-01 ph/cm2/s
Fluence Cutoff-PL 6.45e-09 1.90e-08 4.00e-08 1.30e-07 1.02e-07 1.88e-07 erg/cm2
Error 3.09e-09 3.99e-09 8.12e-09 1.40e-07 1.69e-08 1.21e-07 erg/cm2
Peak flux Cutoff-PL 1.67e-01 2.88e-01 3.31e-01 4.16e-01 9.67e-01 1.20e+00 ph/cm2/s
Error 8.85e-02 6.66e-02 6.72e-02 3.48e-01 1.65e-01 3.80e-01 ph/cm2/s
Fluence Band 6.44e-09 1.88e-08 4.00e-08 1.30e-07 1.02e-07 1.94e-07 erg/cm2
Error 3.05e-09 3.97e-09 8.11e-09 1.40e-07 1.69e-08 1.21e-07 erg/cm2
Peak flux Band 1.49e-01 2.96e-01 3.30e-01 5.11e-01 9.49e-01 1.29e+00 ph/cm2/s
Error 9.24e-02 7.11e-02 6.28e-02 3.28e-01 1.75e-01 3.27e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.955 0.273 - - 8.27e-03 1.28e-03 51.276 57
CPL 0.620 1.103 248.1 4955.4 1.15e-02 2.23e-02 51.022 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.870 0.281 - - 8.56e-03 1.40e-03 52.482 57
CPL 0.379 1.170 202.2 5000.0 1.37e-02 2.61e-02 52.017 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: 0.704000 sec.
T50 in the 50-300 keV band: 0.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.136 -0.068 1.068
T90 0.980 0.020 1.000
T50 0.552 0.216 0.768
Peak 1.000 0.028 1.028
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
56.2964 -39.3297 0.0191 34.4 2.4 0.1332 10.1 TRIG_00286373
------------------------------------------
Foreground time interval of the image:
-0.068 1.068 (delta_t = 1.136 [sec])
Background time interval of the image:
-239.032 -0.068 (delta_t = 238.964 [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 -0.068 sec. to 1.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.955269 ( -0.281015 0.265407 )
Norm@50keV : 8.266612E-03 ( -1.295860E-03 1.272263E-03) )
------------------------------------------------------------
Chi-Squared = 51.27620 using 59 PHA bins.
Reduced chi-squared = 0.8995824 for 57 degrees of freedom
Null hypothesis probability = 0.689
Photon flux (15-150 keV) in 1.136 sec: 0.949889 ( -0.14943 0.150341 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03227e-07 ( -1.61343e-08 1.61755e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.068 sec. to 1.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.620323 ( -1.62161 0.583492 )
Epeak [keV] : 248.061 ( -158.792 9751.94 )
Norm@50keV : 1.146477E-02 ( -4.382668E-03 4.014532E-02) )
------------------------------------------------------------
Chi-Squared = 51.02179 using 59 PHA bins.
Reduced chi-squared = 0.9111034 for 56 degrees of freedom
Null hypothesis probability = 0.663
Photon flux (15-150 keV) in 1.136 sec: 0.937799 ( -0.156317 0.154761 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02261e-07 ( -1.71521e-08 1.6623e-08 ) ergs/cm2
Band function
Time interval is from -0.068 sec. to 1.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.830999 ( -9.16900 5.83100 )
beta : -0.955277 ( -0.265399 0.281023 )
Epeak [keV] : 31.4120 ( -161.312 4622.90 )
Norm@50keV : 1.310284E-02 ( -1.468768E-02 471.697 )
------------------------------------------------------------
Chi-Squared = 51.27620 using 59 PHA bins.
Reduced chi-squared = 0.9322945 for 55 degrees of freedom
Null hypothesis probability = 0.618
Photon flux (15-150 keV) in 1.136 sec: 0.927878 ( -0.163641 0.160372 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02222e-07 ( -1.7128e-08 1.66214e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.028 sec. to 1.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.870452 ( -0.291181 0.270804 )
Norm@50keV : 8.556305E-03 ( -1.423373E-03 1.386158E-03) )
------------------------------------------------------------
Chi-Squared = 52.48198 using 59 PHA bins.
Reduced chi-squared = 0.9207364 for 57 degrees of freedom
Null hypothesis probability = 0.645
Photon flux (15-150 keV) in 1.000 sec: 0.982004 ( -0.159556 0.160666 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.71427e-08 ( -1.53664e-08 1.54503e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.028 sec. to 1.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.378856 ( -1.60558 0.733904 )
Epeak [keV] : 202.242 ( -202.232 9797.76 )
Norm@50keV : 1.373293E-02 ( -6.418034E-03 4.572305E-02) )
------------------------------------------------------------
Chi-Squared = 52.01694 using 59 PHA bins.
Reduced chi-squared = 0.9288740 for 56 degrees of freedom
Null hypothesis probability = 0.626
Photon flux (15-150 keV) in 1.000 sec: 0.966666 ( -0.164312 0.164954 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.59655e-08 ( -1.6348e-08 1.60035e-08 ) ergs/cm2
Band function
Time interval is from 0.028 sec. to 1.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.792328 ( -9.20767 5.79233 )
beta : -0.870448 ( -0.270759 0.291225 )
Epeak [keV] : 15.9357 ( -125.590 9784.06 )
Norm@50keV : 1.252884E-02 ( -5.869759E-03 148998. )
------------------------------------------------------------
Chi-Squared = 52.48197 using 59 PHA bins.
Reduced chi-squared = 0.9542176 for 55 degrees of freedom
Null hypothesis probability = 0.571
Photon flux (15-150 keV) in 1.000 sec: 0.949110 ( -0.179557 0.17078 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.50085e-08 ( -1.62112e-08 1.59235e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 06:01:25 EST 2007