batgrbproduct Analysis for Trigger=226614
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 02:02:32 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger226614/GCN5_download_cron
======================================================================
Trigger: 00226614 Segment: 000
BAT Trigger Time: 178279096 [s; MET]
Trigger Stop: 178279160 [s; MET]
UTC: 2006-08-26T09:58:14.595620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 208.218966460113 Dec: 11.8712232052368 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.24
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.24
Flight Position: [ source = BAT ]
RA: 208.218966460113 Dec: 11.8712232052368 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 208.222359456479 Dec: 11.8160568778843 [deg; J2000]
{ 13h 52m 53.4s , +11d 48' 57.8" }
+/- 4.41292193833374 [arcmin] (estimated 90% radius based on SNR)
+/- 2.66459171056332 [arcmin] (formal 1-sigma fit error)
SNR: 3.64821888332103
RA = 13h 52m 53.4s (208.222359 deg.)
Dec = 11d 48' 58" (11.816057 deg.)
Angular difference between Flight and Ground position is 3.315971 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.176747 0.195529 -0.057258 -0.024768
0.036421 0.036148 0.031685 0.027817 [error]
Peak 0.176747 0.195529 -0.057258 -0.024768
0.036421 0.036148 0.031685 0.027817 [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 5.53e-08 4.97e-08 3.08e-08 2.90e-08 1.48e-07 1.65e-07 erg/cm2
Error 1.55e-08 1.64e-08 1.87e-08 3.25e-08 5.01e-08 6.82e-08 erg/cm2
Peak flux Power-law 2.86e-02 1.44e-02 4.45e-03 1.76e-03 4.84e-02 4.91e-02 ph/cm2/s
Error 8.10e-03 4.59e-03 3.69e-03 2.09e-03 1.28e-02 1.32e-02 ph/cm2/s
Fluence Cutoff-PL 5.15e-08 7.83e-08 1.18e-08 3.95e-11 1.42e-07 1.42e-07 erg/cm2
Error 1.68e-08 2.26e-08 1.37e-08 9.28e-10 3.66e-08 3.66e-08 erg/cm2
Peak flux Cutoff-PL 2.54e-02 2.29e-02 1.98e-03 3.59e-06 5.03e-02 5.03e-02 ph/cm2/s
Error 8.01e-03 5.10e-03 2.45e-03 7.86e-05 1.19e-02 1.19e-02 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.673 0.533 - - 2.21e-04 1.02e-04 76.082 57
CPL -2.498 0.000 28.6 5.2 5.91e-01 1.50e+00 66.527 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.673 0.533 - - 2.21e-04 1.02e-04 76.082 57
CPL -2.498 0.000 28.6 5.2 5.91e-01 1.50e+00 66.527 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
208.2224 +11.8161 0.0527 15.4 -132.4 0.2777 3.6 TRIG_00226614
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.67315 ( -0.452934 0.613797 )
Norm@50keV : 2.212722E-04 ( -1.010201E-04 1.029147E-04) )
------------------------------------------------------------
Chi-Squared = 76.08228 using 59 PHA bins.
Reduced chi-squared = 1.334777 for 57 degrees of freedom
Null hypothesis probability = 4.644E-02
Photon flux (15-150 keV) in 64.00 sec: 4.842479E-02 ( -0.0126631 0.0129551 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48176e-07 ( -4.76192e-08 5.26566e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49821 ( )
Epeak [keV] : 28.6258 ( -4.90406 5.42727 )
Norm@50keV : 0.591340 ( -1.19071 1.80141 )
------------------------------------------------------------
Chi-Squared = 66.52689 using 59 PHA bins.
Reduced chi-squared = 1.187980 for 56 degrees of freedom
Null hypothesis probability = 0.159
Photon flux (15-150 keV) in 64.00 sec: 5.027919E-02 ( -0.0118109 0.0119915 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41951e-07 ( -3.56006e-08 3.75674e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36443 ( -6.72532 2.86374 )
beta : -9.34372 ( )
Epeak [keV] : 15.8743 ( )
Norm@50keV : 1.755150E-03 ( )
------------------------------------------------------------
Chi-Squared = 71.08866 using 59 PHA bins.
Reduced chi-squared = 1.292521 for 55 degrees of freedom
Null hypothesis probability = 7.107E-02
Photon flux (15-150 keV) in 64.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.67315 ( -0.452934 0.613797 )
Norm@50keV : 2.212722E-04 ( -1.010201E-04 1.029147E-04) )
------------------------------------------------------------
Chi-Squared = 76.08228 using 59 PHA bins.
Reduced chi-squared = 1.334777 for 57 degrees of freedom
Null hypothesis probability = 4.644E-02
Photon flux (15-150 keV) in 64.00 sec: 4.842479E-02 ( -0.0126631 0.0129551 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48176e-07 ( -4.76192e-08 5.26566e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49821 ( )
Epeak [keV] : 28.6258 ( -4.90406 5.42727 )
Norm@50keV : 0.591340 ( -1.19071 1.80141 )
------------------------------------------------------------
Chi-Squared = 66.52689 using 59 PHA bins.
Reduced chi-squared = 1.187980 for 56 degrees of freedom
Null hypothesis probability = 0.159
Photon flux (15-150 keV) in 64.00 sec: 5.027919E-02 ( -0.0118109 0.0119915 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41951e-07 ( -3.56006e-08 3.75674e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36443 ( -0.779373 2.86374 )
beta : -9.34372 ( )
Epeak [keV] : 15.8743 ( )
Norm@50keV : 1.755150E-03 ( )
------------------------------------------------------------
Chi-Squared = 71.08866 using 59 PHA bins.
Reduced chi-squared = 1.292521 for 55 degrees of freedom
Null hypothesis probability = 7.107E-02
Photon flux (15-150 keV) in 64.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Jan 2 02:32:06 EST 2008