batgrbproduct Analysis for Trigger=207399
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): Mon Dec 31 20:43:13 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger207399/SDC
======================================================================
Trigger: 00207399 Segment: 000
BAT Trigger Time: 167907280 [s; MET]
Trigger Stop: 167907408 [s; MET]
UTC: 2006-04-28T08:54:38.839960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 235.350233277521 Dec: 62.0100932089346 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.21
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.21
Flight Position: [ source = BAT ]
RA: 235.350233277521 Dec: 62.0100932089346 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 235.346168144943 Dec: 62.0225030817784 [deg; J2000]
{ 15h 41m 23.1s , +62d 01' 21.0" }
+/- 2.89482593094067 [arcmin] (estimated 90% radius based on SNR)
+/- 1.76058343767704 [arcmin] (formal 1-sigma fit error)
SNR: 6.66281463592007
RA = 15h 41m 23.1s (235.346168 deg.)
Dec = 62d 1' 21" (62.022503 deg.)
Angular difference between Flight and Ground position is 0.753336 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 96 +/- 50.5964425626941
Measured from: -15
to: 81 [s; relative to TRIGTIME]
T50: 16 +/- 22.6274169979695
Measured from: 1
to: 17 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.5
to: 9.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15
to: 113 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.957330 0.759246 0.077829 0.046403
0.063941 0.065330 0.057626 0.050898 [error]
Peak 0.274126 0.220231 0.042305 0.029942
0.023097 0.023580 0.020536 0.017932 [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 3.41e-07 2.86e-07 1.63e-07 1.38e-07 8.50e-07 9.28e-07 erg/cm2
Error 4.23e-08 3.60e-08 4.34e-08 6.74e-08 1.05e-07 1.39e-07 erg/cm2
Peak flux Power-law 1.86e-01 9.92e-02 3.29e-02 1.41e-02 3.26e-01 3.32e-01 ph/cm2/s
Error 2.77e-02 1.37e-02 9.20e-03 7.07e-03 3.93e-02 4.04e-02 ph/cm2/s
Fluence Cutoff-PL 3.26e-07 3.20e-07 6.68e-08 1.50e-09 7.15e-07 7.15e-07 erg/cm2
Error 4.73e-08 4.68e-08 5.97e-08 1.81e-08 1.04e-07 1.06e-07 erg/cm2
Peak flux Cutoff-PL 1.81e-01 1.12e-01 1.84e-02 5.48e-04 3.13e-01 3.12e-01 ph/cm2/s
Error 2.97e-02 1.87e-02 1.82e-02 6.31e-03 4.08e-02 4.09e-02 ph/cm2/s
Fluence Band 3.26e-07 3.12e-07 1.09e-07 3.87e-08 7.74e-07 7.88e-07 erg/cm2
Error 5.18e-08 4.29e-08 4.47e-08 4.79e-08 9.89e-08 1.54e-07 erg/cm2
Peak flux Band 1.85e-01 1.11e-01 2.27e-02 5.40e-03 3.17e-01 3.25e-01 ph/cm2/s
Error 1.78e-02 8.54e-03 2.43e-03 3.97e-02 4.11e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.811 0.250 - - 5.99e-04 1.18e-04 68.832 57
CPL 0.354 2.108 20.1 12.8 2.96e-02 9.26e-01 63.338 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.590 0.271 - - 1.57e-03 3.34e-04 68.863 57
CPL 0.796 2.278 20.4 12.9 2.71e-02 3.54e+00 65.822 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 128.000 -15.000 113.000
T90 96.000 -15.000 81.000
T50 16.000 1.000 17.000
Peak 1.000 8.500 9.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
235.3462 +62.0225 0.0288 31.1 2.6 1.5594 6.7 TRIG_00207399
------------------------------------------
Foreground time interval of the image:
-15.000 113.000 (delta_t = 128.000 [sec])
Background time interval of the image:
-64.995 -15.000 (delta_t = 49.995 [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 -15.000 sec. to 113.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.81094 ( -0.239491 0.261207 )
Norm@50keV : 5.993866E-04 ( -1.163640E-04 1.190712E-04) )
------------------------------------------------------------
Chi-Squared = 68.83181 using 59 PHA bins.
Reduced chi-squared = 1.207576 for 57 degrees of freedom
Null hypothesis probability = 0.135
Photon flux (15-150 keV) in 128.0 sec: 0.144193 ( -0.014614 0.014615 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.50405e-07 ( -1.03341e-07 1.07366e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.000 sec. to 113.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.353695 ( -2.56516 1.64996 )
Epeak [keV] : 20.0969 ( -20.0869 5.46832 )
Norm@50keV : 2.956188E-02 ( -2.956188E-02 1.82320 )
------------------------------------------------------------
Chi-Squared = 63.33821 using 59 PHA bins.
but latest trial 2.00365 gives Chi-Squared = 40.1849
Reduced chi-squared = 1.131039 for 56 degrees of freedom
Null hypothesis probability = 0.233
Photon flux (15-150 keV) in 128.0 sec: 0.144135 ( -0.014608 0.014608 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.14935e-07 ( -9.15456e-08 1.17043e-07 ) ergs/cm2
Band function
Time interval is from -15.000 sec. to 113.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43279 ( -0.618000 0.448321 )
beta : -9.24511 ( -0.754890 19.2450 )
Epeak [keV] : 13.5717 ( -6.63431 3.85601 )
Norm@50keV : 4.853882E-03 ( -5.305452E-02 2.70113 )
------------------------------------------------------------
Chi-Squared = 64.53846 using 59 PHA bins.
Reduced chi-squared = 1.173427 for 55 degrees of freedom
Null hypothesis probability = 0.178
Photon flux (15-150 keV) in 128.0 sec: 0.137372 ( -0.015414 0.014128 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.74109e-07 ( -8.79386e-08 1.09892e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.000 sec. to 17.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.59048 ( -0.258199 0.284419 )
Norm@50keV : 1.568520E-03 ( -3.331541E-04 3.356743E-04) )
------------------------------------------------------------
Chi-Squared = 68.86315 using 59 PHA bins.
Reduced chi-squared = 1.208125 for 57 degrees of freedom
Null hypothesis probability = 0.135
Photon flux (15-150 keV) in 16.00 sec: 0.326037 ( -0.039285 0.039292 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57595e-07 ( -3.85888e-08 4.01888e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.000 sec. to 17.000 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.796247 ( -3.33781 1.21783 )
Epeak [keV] : 20.4168 ( -19.0815 6.64041 )
Norm@50keV : 2.707880E-02 ( -2.707880E-02 7.05897 )
------------------------------------------------------------
Chi-Squared = 65.82246 using 59 PHA bins.
but latest trial 2.01464 gives Chi-Squared = 17.4902
but latest trial 1.43207 gives Chi-Squared = 1.02787
Reduced chi-squared = 1.175401 for 56 degrees of freedom
Null hypothesis probability = 0.173
Photon flux (15-150 keV) in 16.00 sec: 0.312526 ( -0.040517 0.041051 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16866e-07 ( -3.8328e-08 5.30112e-08 ) ergs/cm2
Band function
Time interval is from 1.000 sec. to 17.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45320 ( -2.99691 1.50585 )
beta : -9.33206 ( -6.93302 0.528296 )
Epeak [keV] : 15.4192 ( -6.09864 5.29202 )
Norm@50keV : 9.141393E-03 ( -2.50219 406.042 )
------------------------------------------------------------
Chi-Squared = 66.15118 using 59 PHA bins.
Reduced chi-squared = 1.202749 for 55 degrees of freedom
Null hypothesis probability = 0.144
Photon flux (15-150 keV) in 16.00 sec: 0.317168 ( -0.03952 0.039974 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33069e-07 ( -3.96336e-08 3.32368e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 21:01:00 EST 2007