batgrbproduct Analysis for Trigger=290843
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 11:37:47 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger290843/GCN5_download_cron
======================================================================
Trigger: 00290843 Segment: 000
BAT Trigger Time: 211336606.208 [s; MET]
Trigger Stop: 211336607.232 [s; MET]
UTC: 2007-09-13T00:36:43.987920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 228.831779421729 Dec: -24.3419572889613 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.63
Image Trigger?: NO
Rate S/N Ratio: 14.422205101856 [ if not an image trigger ]
Image S/N Ratio: 9.63
Flight Position: [ source = BAT ]
RA: 228.831779421729 Dec: -24.3419572889613 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 228.73957299807 Dec: -24.2798864816012 [deg; J2000]
{ 15h 14m 57.5s , -24d 16' 47.6" }
+/- 1.76233193070894 [arcmin] (estimated 90% radius based on SNR)
+/- 0.892889938250616 [arcmin] (formal 1-sigma fit error)
SNR: 13.5383116885185
RA = 15h 14m 57.5s (228.739573 deg.)
Dec = -24d 16' 48" (-24.279886 deg.)
Angular difference between Flight and Ground position is 6.268155 arcmin
Partial Coding Fraction: 0.515625 [ including projection effects ]
Duration
T90: 2.7320000231266 +/- 0.514525038865242
Measured from: -1.50400000810623
to: 1.22800001502037 [s; relative to TRIGTIME]
T50: 1.22400000691414 +/- 0.569701670149755
Measured from: -0.631999999284744
to: 0.592000007629395 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.340000003576279
to: 0.659999996423721 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.58399999141693
to: 1.31999999284744 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.065706 0.099382 0.077729 0.000997
0.013048 0.013555 0.011999 0.009839 [error]
Peak 0.021856 0.042023 0.034861 0.009151
0.007753 0.008035 0.007107 0.005669 [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 2.24e-08 4.17e-08 5.99e-08 1.83e-07 1.70e-07 3.08e-07 erg/cm2
Error 5.68e-09 6.78e-09 1.09e-08 6.92e-08 2.75e-08 7.78e-08 erg/cm2
Peak flux Power-law 2.63e-01 3.01e-01 2.47e-01 3.39e-01 9.33e-01 1.15e+00 ph/cm2/s
Error 9.93e-02 7.29e-02 5.41e-02 1.48e-01 2.02e-01 2.34e-01 ph/cm2/s
Fluence Cutoff-PL 1.55e-08 5.10e-08 6.64e-08 2.33e-08 1.52e-07 1.56e-07 erg/cm2
Error 6.92e-09 9.77e-09 1.48e-08 3.63e-08 3.02e-08 4.51e-08 erg/cm2
Peak flux Cutoff-PL 1.84e-01 3.44e-01 2.92e-01 9.56e-02 8.93e-01 9.15e-01 ph/cm2/s
Error 8.13e-02 9.49e-02 7.14e-02 1.36e-01 2.03e-01 2.31e-01 ph/cm2/s
Fluence Band 1.52e-08 5.16e-08 6.33e-08 6.65e-08 1.58e-07 2.04e-07 erg/cm2
Error 7.10e-09 8.30e-09 1.33e-08 5.61e-08 2.78e-08 7.57e-08 erg/cm2
Peak flux Band 1.82e-01 3.44e-01 2.93e-01 9.49e-02 9.04e-01 9.13e-01 ph/cm2/s
Error 7.82e-02 9.20e-02 5.76e-02 1.93e-01 1.77e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.475 0.239 - - 6.16e-03 9.36e-04 55.363 57
CPL -0.690 1.841 61.4 20.1 7.62e-02 3.41e-01 47.699 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.284 0.320 - - 7.84e-03 1.60e-03 61.764 57
CPL -0.427 2.044 75.2 85.9 5.20e-02 3.14e-01 57.876 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.904 -1.584 1.320
T90 2.732 -1.504 1.228
T50 1.224 -0.632 0.592
Peak 1.000 -0.340 0.660
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
228.7396 -24.2799 0.0142 41.8 -8.5 0.3360 13.5 TRIG_00290843
------------------------------------------
Foreground time interval of the image:
-1.584 1.320 (delta_t = 2.904 [sec])
Background time interval of the image:
-239.208 -1.584 (delta_t = 237.624 [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 -1.584 sec. to 1.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47510 ( -0.239107 0.238654 )
Norm@50keV : 6.160848E-03 ( -9.362698E-04 9.347755E-04) )
------------------------------------------------------------
Chi-Squared = 55.36346 using 59 PHA bins.
Reduced chi-squared = 0.9712887 for 57 degrees of freedom
Null hypothesis probability = 0.537
Photon flux (15-150 keV) in 2.904 sec: 0.764074 ( -0.120048 0.120598 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70417e-07 ( -2.73679e-08 2.76353e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.584 sec. to 1.320 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.690396 ( -2.23504 1.44731 )
Epeak [keV] : 61.3638 ( -10.8691 29.3572 )
Norm@50keV : 7.617863E-02 ( -7.617863E-02 0.606799 )
------------------------------------------------------------
Chi-Squared = 47.69930 using 59 PHA bins.
but latest trial 50.4946 gives Chi-Squared = 2.73038
Reduced chi-squared = 0.8517733 for 56 degrees of freedom
Null hypothesis probability = 0.777
Photon flux (15-150 keV) in 2.904 sec: 0.713176 ( -0.125964 0.126131 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51663e-07 ( -2.95157e-08 3.09163e-08 ) ergs/cm2
Band function
Time interval is from -1.584 sec. to 1.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.02940 ( -1.55300 3.97060 )
beta : -2.59978 ( -7.40022 0.873859 )
Epeak [keV] : 56.4592 ( -19.3600 17.7331 )
Norm@50keV : 0.124495 ( -0.799333 11.9261 )
------------------------------------------------------------
Chi-Squared = 46.78759 using 59 PHA bins.
Reduced chi-squared = 0.8506835 for 55 degrees of freedom
Null hypothesis probability = 0.777
Photon flux (15-150 keV) in 2.904 sec: 0.705943 ( -0.110538 0.114376 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57719e-07 ( -2.74594e-08 2.82068e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28437 ( -0.325725 0.313303 )
Norm@50keV : 7.844381E-03 ( -1.598049E-03 1.594915E-03) )
------------------------------------------------------------
Chi-Squared = 61.76403 using 59 PHA bins.
Reduced chi-squared = 1.083580 for 57 degrees of freedom
Null hypothesis probability = 0.310
Photon flux (15-150 keV) in 1.000 sec: 0.933316 ( -0.200917 0.202914 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.78336e-08 ( -1.63231e-08 1.63951e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.426908 ( -2.57309 1.51539 )
Epeak [keV] : 75.2040 ( -20.6896 151.189 )
Norm@50keV : 5.196331E-02 ( -5.196331E-02 0.576481 )
------------------------------------------------------------
Chi-Squared = 57.87563 using 59 PHA bins.
Reduced chi-squared = 1.033493 for 56 degrees of freedom
Null hypothesis probability = 0.406
Photon flux (15-150 keV) in 1.000 sec: 0.893323 ( -0.201156 0.205277 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.25745e-08 ( -1.79616e-08 1.78902e-08 ) ergs/cm2
Band function
Time interval is from -0.340 sec. to 0.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.179447 ( -3.79086 1.49559 )
beta : -7.54990 ( -1.21911 0.694147 )
Epeak [keV] : 97.8360 ( -15.8330 57.3056 )
Norm@50keV : 2.862270E-02 ( -9.12726 4.22041 )
------------------------------------------------------------
Chi-Squared = 59.14049 using 59 PHA bins.
Reduced chi-squared = 1.075282 for 55 degrees of freedom
Null hypothesis probability = 0.327
Photon flux (15-150 keV) in 1.000 sec: 0.903532 ( -0.186065 0.199038 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.30154e-08 ( -1.5698e-08 1.67483e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 11:57:01 EST 2007