batgrbproduct Analysis for Trigger=241840
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 Jan 2 14:30:19 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger241840/GCN5_download_cron
======================================================================
Trigger: 00241840 Segment: 000
BAT Trigger Time: 186681518.336 [s; MET]
Trigger Stop: 186681518.784 [s; MET]
UTC: 2006-12-01T15:58:36.729720 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 64 ms to TRIGTIME + 320 ms
BAT
RA: 331.971646734012 Dec: -74.6005732902225 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.37
Image Trigger?: NO
Rate S/N Ratio: 42.9301758673314 [ if not an image trigger ]
Image S/N Ratio: 7.37
Flight Position: [ source = BAT ]
RA: 331.971646734012 Dec: -74.6005732902225 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 332.084723020161 Dec: -74.5729613814486 [deg; J2000]
{ 22h 08m 20.3s , -74d 34' 22.7" }
+/- 1.21062889039871 [arcmin] (estimated 90% radius based on SNR)
+/- 0.52743467580536 [arcmin] (formal 1-sigma fit error)
SNR: 23.1489442497958
RA = 22h 8m 20.3s (332.084723 deg.)
Dec = -74d 34' 23" (-74.572961 deg.)
Angular difference between Flight and Ground position is 2.448718 arcmin
Partial Coding Fraction: 0.4804688 [ including projection effects ]
Duration
T90: 0.772000014781952 +/- 0.0989545476206747
Measured from: 0.104000002145767
to: 0.876000016927719 [s; relative to TRIGTIME]
T50: 0.435999989509583 +/- 0.0544058695894356
Measured from: 0.240000009536743
to: 0.675999999046326 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0180000066757202
to: 1.01800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0920000076293945
to: 0.944000005722046 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.064920 0.125864 0.165039 0.073417
0.008661 0.010031 0.010830 0.010210 [error]
Peak 0.064920 0.125864 0.165039 0.073417
0.008661 0.010031 0.010830 0.010210 [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 1.93e-08 5.42e-08 1.24e-07 7.58e-07 3.34e-07 6.91e-07 erg/cm2
Error 3.50e-09 5.74e-09 9.87e-09 1.50e-07 2.70e-08 0.00e+00 erg/cm2
Peak flux Power-law 7.16e-01 1.09e+00 1.25e+00 2.72e+00 3.86e+00 5.78e+00 ph/cm2/s
Error 1.32e-01 1.20e-01 9.73e-02 4.96e-01 3.08e-01 5.11e-01 ph/cm2/s
Fluence Cutoff-PL 1.93e-08 5.42e-08 1.24e-07 7.55e-07 3.34e-07 4.29e-07 erg/cm2
Error 3.50e-09 5.75e-09 9.89e-09 1.49e-07 2.71e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.15e-01 1.09e+00 1.25e+00 2.71e+00 3.86e+00 5.76e+00 ph/cm2/s
Error 1.32e-01 1.20e-01 9.74e-02 4.93e-01 3.08e-01 5.08e-01 ph/cm2/s
Fluence Band 1.90e-08 5.40e-08 1.24e-07 7.54e-07 3.34e-07 4.24e-07 erg/cm2
Error 3.46e-09 5.73e-09 9.87e-09 2.01e-07 2.70e-08 0.00e+00 erg/cm2
Peak flux Band 6.99e-01 1.09e+00 1.25e+00 2.71e+00 3.86e+00 5.61e+00 ph/cm2/s
Error 1.44e-01 1.20e-01 9.74e-02 5.16e-01 3.08e-01 6.33e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.808 0.147 - - 3.36e-02 2.74e-03 61.592 57
CPL 0.800 0.148 9999.2 5000.0 3.39e-02 2.75e-03 61.619 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.808 0.147 - - 3.36e-02 2.74e-03 61.592 57
CPL 0.800 0.148 9999.2 5000.0 3.39e-02 2.75e-03 61.619 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: 0.576000 sec.
T50 in the 50-300 keV band: 0.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.852 0.092 0.944
T90 0.772 0.104 0.876
T50 0.436 0.240 0.676
Peak 1.000 0.018 1.018
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
332.0847 -74.5730 0.0083 38.1 -34.5 0.4432 23.1 TRIG_00241840
------------------------------------------
Foreground time interval of the image:
0.028 0.880 (delta_t = 0.852 [sec])
Background time interval of the image:
-239.400 0.028 (delta_t = 239.428 [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 0.028 sec. to 0.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.807899 ( -0.148794 0.144339 )
Norm@50keV : 3.363614E-02 ( -2.758691E-03 2.720948E-03) )
------------------------------------------------------------
Chi-Squared = 61.59155 using 59 PHA bins.
Reduced chi-squared = 1.080554 for 57 degrees of freedom
Null hypothesis probability = 0.315
Photon flux (15-150 keV) in 0.8520 sec: 3.86484 ( -0.30734 0.3087 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3377e-07 ( -2.69956e-08 2.70732e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.028 sec. to 0.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.800298 ( -0.150122 0.145563 )
Epeak [keV] : 9999.19 ( -9999.18 0.809570 )
Norm@50keV : 3.387678E-02 ( -2.767112E-03 2.730772E-03) )
------------------------------------------------------------
Chi-Squared = 61.61874 using 59 PHA bins.
Reduced chi-squared = 1.100335 for 56 degrees of freedom
Null hypothesis probability = 0.282
Photon flux (15-150 keV) in 0.8520 sec: 3.86384 ( -0.30723 0.30858 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33958e-07 ( -2.70374e-08 2.70774e-08 ) ergs/cm2
Band function
Time interval is from 0.028 sec. to 0.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.738144 ( -9.26186 5.73814 )
beta : -0.807892 ( -0.144346 0.148786 )
Epeak [keV] : 16.1590 ( -16.0590 9983.84 )
Norm@50keV : 4.936196E-02 ( -1.823108E-02 758344. )
------------------------------------------------------------
Chi-Squared = 61.59154 using 59 PHA bins.
Reduced chi-squared = 1.119846 for 55 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 0.8520 sec: 3.86384 ( -0.30723 0.30858 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33714e-07 ( -2.70067e-08 2.70783e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.028 sec. to 0.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.807899 ( -0.148794 0.144339 )
Norm@50keV : 3.363614E-02 ( -2.758691E-03 2.720948E-03) )
------------------------------------------------------------
Chi-Squared = 61.59155 using 59 PHA bins.
Reduced chi-squared = 1.080554 for 57 degrees of freedom
Null hypothesis probability = 0.315
Photon flux (15-150 keV) in 0.8520 sec: 3.86484 ( -0.30734 0.3087 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3377e-07 ( -2.69956e-08 2.70732e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.028 sec. to 0.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.800298 ( -0.150122 0.145563 )
Epeak [keV] : 9999.19 ( -9999.18 0.809570 )
Norm@50keV : 3.387678E-02 ( -2.767112E-03 2.730772E-03) )
------------------------------------------------------------
Chi-Squared = 61.61874 using 59 PHA bins.
Reduced chi-squared = 1.100335 for 56 degrees of freedom
Null hypothesis probability = 0.282
Photon flux (15-150 keV) in 0.8520 sec: 3.86384 ( -0.30723 0.30858 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33958e-07 ( -2.70374e-08 2.70774e-08 ) ergs/cm2
Band function
Time interval is from 0.028 sec. to 0.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.738144 ( -9.26186 5.73814 )
beta : -0.807892 ( -0.144346 0.148786 )
Epeak [keV] : 16.1590 ( -16.0590 9983.84 )
Norm@50keV : 4.936196E-02 ( -1.823108E-02 758344. )
------------------------------------------------------------
Chi-Squared = 61.59154 using 59 PHA bins.
Reduced chi-squared = 1.119846 for 55 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 0.8520 sec: 3.86384 ( -0.30723 0.30858 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33714e-07 ( -2.70067e-08 2.70783e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 14:57:24 EST 2008