batgrbproduct Analysis for Trigger=311603
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): Wed May 14 19:06:10 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger311603/GCN5_download_cron
======================================================================
Trigger: 00311603 Segment: 000
BAT Trigger Time: 232453960 [s; MET]
Trigger Stop: 232454024 [s; MET]
UTC: 2008-05-14T10:32:37.210640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 263.832819101055 Dec: -35.6234751720873 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.18
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.18
Flight Position: [ source = BAT ]
RA: 263.832819101055 Dec: -35.6234751720873 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 263.858753305155 Dec: -35.6778280761805 [deg; J2000]
{ 17h 35m 26.1s , -35d 40' 40.2" }
+/- 3.32001028530341 [arcmin] (estimated 90% radius based on SNR)
+/- 1.83504775234635 [arcmin] (formal 1-sigma fit error)
SNR: 5.47814446879119
Angular difference between Flight and Ground position is 3.497718 arcmin
Partial Coding Fraction: 0.4570312 [ including projection effects ]
Duration
T90: 274.719999998808 +/- 140.252279325654
Measured from: -83.8799999952316
to: 190.840000003576 [s; relative to TRIGTIME]
T50: 104.991999983788 +/- 114.047443963474
Measured from: -37.6559999883175
to: 67.33599999547 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -79.608000010252
to: -78.608000010252 [s; relative to TRIGTIME]
Total Fluence
Measured from: -90.4880000054836
to: 204.768000006676 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.899283 0.446654 -0.097940 0.355486
0.138956 0.129212 0.114010 0.111698 [error]
Peak 0.036149 0.014468 0.009206 0.003009
0.008835 0.007929 0.007343 0.006355 [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 6.60e-07 1.67e-07 2.22e-08 3.31e-09 8.51e-07 8.52e-07 erg/cm2
Error 1.05e-07 7.13e-08 2.26e-08 6.65e-09 1.51e-07 1.52e-07 erg/cm2
Peak flux Power-law 3.49e-01 1.50e-01 3.84e-02 1.21e-02 5.45e-01 5.50e-01 ph/cm2/s
Error 1.60e-01 1.16e-01 5.08e-02 3.73e-02 2.16e-01 2.20e-01 ph/cm2/s
Fluence Cutoff-PL 6.59e-07 1.67e-07 2.21e-08 3.28e-09 8.51e-07 8.52e-07 erg/cm2
Error 1.05e-07 7.13e-08 2.26e-08 6.60e-09 1.51e-07 1.52e-07 erg/cm2
Peak flux Cutoff-PL 3.49e-01 1.50e-01 3.83e-02 1.20e-02 5.44e-01 5.49e-01 ph/cm2/s
Error 1.60e-01 1.16e-01 5.07e-02 3.70e-02 2.16e-01 2.20e-01 ph/cm2/s
Fluence Band 2.25e-07 1.69e-07 2.30e-08 3.53e-09 8.44e-07 1.34e-06 erg/cm2
Error 4.16e-08 3.98e-08 3.98e-09 1.38e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 3.72e-01 1.44e-01 2.97e-02 7.28e-03 5.50e-01 5.58e-01 ph/cm2/s
Error 1.76e-01 9.17e-02 2.89e-02 3.35e-02 2.13e-01 2.20e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.915 0.791 - - 6.37e-05 6.38e-05 72.230 57
CPL 1.807 0.000 1.3 6.2 2.51e-02 1.02e+02 73.945 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.967 1.324 - - 2.03e-03 2.08e-03 53.456 57
CPL 1.954 1.352 1.1 0.0 1.22e-02 0.00e+00 54.017 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 295.256 -90.488 204.768
T90 274.720 -83.880 190.840
T50 104.992 -37.656 67.336
Peak 1.000 -79.608 -78.608
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
263.8588 -35.6778 0.0351 32.3 39.6 1.6063 5.5 TRIG_00311603
------------------------------------------
Foreground time interval of the image:
-90.488 72.401 (delta_t = 162.889 [sec])
Background time interval of the image:
-239.000 -90.488 (delta_t = 148.512 [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
Multiple GTIs in the spectrum
tstart tstop
-90.488000 198.690000
203.000000 204.768000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.91510 ( -0.735449 0.845831 )
Norm@50keV : 6.374928E-05 ( -6.374928E-05 6.375910E-05) )
------------------------------------------------------------
Chi-Squared = 72.23032 using 59 PHA bins.
Reduced chi-squared = 1.267199 for 57 degrees of freedom
Null hypothesis probability = 8.420E-02
Photon flux (15-150 keV) in 290.9 sec: 9.074084E-02 ( -0.0142331 0.0142402 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.51278e-07 ( -1.48115e-07 1.53584e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-90.488000 198.690000
203.000000 204.768000
Parameters : value lower 90% higher 90%
Photon index: 1.80655 ( )
Epeak [keV] : 1.26501 ( -0.320815 12.0787 )
Norm@50keV : 2.505215E-02 ( -1.997536E-02 203.439 )
------------------------------------------------------------
Chi-Squared = 73.94495 using 59 PHA bins.
but latest trial 0.725565 gives Chi-Squared = 0.598862
but latest trial -1.50921 gives Chi-Squared = 0.129234
Reduced chi-squared = 1.320446 for 56 degrees of freedom
Null hypothesis probability = 5.438E-02
Photon flux (15-150 keV) in 290.9 sec: 9.066078E-02 ( -0.0142228 0.0142302 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.50891e-07 ( -1.48054e-07 1.53694e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-90.488000 198.690000
203.000000 204.768000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30231 ( -7.18048 0.758604 )
beta : -3.59678 ( -0.847946 0.731872 )
Epeak [keV] : 8.22514 ( -8.12514 9991.77 )
Norm@50keV : 8.503006E-03 ( -0.396434 17.8390 )
------------------------------------------------------------
Chi-Squared = 88.92730 using 59 PHA bins.
Reduced chi-squared = 1.616860 for 55 degrees of freedom
Null hypothesis probability = 2.559E-03
Photon flux (15-150 keV) in 290.9 sec: 9.083333E-02 ( -0.0142787 0.0151317 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.44061e-07 ( -1.31597e-07 1.44167e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -79.608 sec. to -78.608 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.96709 ( -1.06794 1.58095 )
Norm@50keV : 2.028400E-03 ( -2.028400E-03 2.132856E-03) )
------------------------------------------------------------
Chi-Squared = 53.45563 using 59 PHA bins.
Reduced chi-squared = 0.9378181 for 57 degrees of freedom
Null hypothesis probability = 0.609
Photon flux (15-150 keV) in 1.000 sec: 0.544690 ( -0.215605 0.215754 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40111e-08 ( -1.18749e-08 1.50159e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -79.608 sec. to -78.608 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.95450 ( -0.972379 1.73208 )
Epeak [keV] : 1.09673 ( )
Norm@50keV : 1.218517E-02 ( )
------------------------------------------------------------
Chi-Squared = 54.01735 using 59 PHA bins.
but latest trial 0.982121 gives Chi-Squared = 14.4962
but latest trial -3.75047 gives Chi-Squared = 0.346130
Reduced chi-squared = 0.9645956 for 56 degrees of freedom
Null hypothesis probability = 0.550
Photon flux (15-150 keV) in 1.000 sec: 0.544387 ( -0.215529 0.215679 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4007e-08 ( -1.18797e-08 1.50048e-08 ) ergs/cm2
Band function
Time interval is from -79.608 sec. to -78.608 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50774 ( -8.49226 6.50774 )
beta : -2.77109 ( -7.03535 1.06351 )
Epeak [keV] : 7.66355 ( -7.56200 42.7790 )
Norm@50keV : 2.734943E-02 ( -2.850590E-02 40.5648 )
------------------------------------------------------------
Chi-Squared = 53.51989 using 59 PHA bins.
Reduced chi-squared = 0.9730889 for 55 degrees of freedom
Null hypothesis probability = 0.531
Photon flux (15-150 keV) in 1.000 sec: 0.550199 ( -0.213515 0.21218 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49563e-08 ( -1.25795e-08 9.7843e-09 ) ergs/cm2
Plot creation:
Wed May 14 19:33:32 EDT 2008