batgrbproduct Analysis for Trigger=219136
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): Tue Jan 1 20:51:44 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger219136/GCN5_download_cron
======================================================================
Trigger: 00219136 Segment: 000
BAT Trigger Time: 174590774.368 [s; MET]
Trigger Stop: 174590774.752 [s; MET]
UTC: 2006-07-14T17:26:13.051280 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 279.036808989753 Dec: -42.7329302989282 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.88
Image Trigger?: NO
Rate S/N Ratio: 8.94427190999916 [ if not an image trigger ]
Image S/N Ratio: 6.88
Flight Position: [ source = BAT ]
RA: 279.036808989753 Dec: -42.7329302989282 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 278.880894560861 Dec: -42.7215305120627 [deg; J2000]
{ 18h 35m 31.4s , -42d 43' 17.5" }
+/- 5.62102918116585 [arcmin] (estimated 90% radius based on SNR)
+/- 4.01978822055275 [arcmin] (formal 1-sigma fit error)
SNR: 2.58198012189971
RA = 18h 35m 31.4s (278.880895 deg.)
Dec = -42d 43' 18" (-42.721531 deg.)
Angular difference between Flight and Ground position is 6.905966 arcmin
Partial Coding Fraction: 0.5703125 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001656 0.002668 0.005799 0.002928
0.003755 0.003732 0.003417 0.002937 [error]
Peak 0.001656 0.002668 0.005799 0.002928
0.003755 0.003732 0.003417 0.002937 [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 8.98e-11 6.55e-10 7.95e-10 1.39e-07 4.56e-09 8.82e-08 erg/cm2
Error 6.52e-10 3.23e-09 1.30e-07 9.02e-09 1.35e-07 0.00e+00 erg/cm2
Peak flux Power-law 8.63e-03 2.72e-02 7.09e-02 8.44e-01 6.55e-02 6.36e-01 ph/cm2/s
Error 5.45e-02 6.60e-02 8.08e-01 2.13e-01 8.56e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 1.06e-10 6.37e-10 7.38e-10 1.53e-07 4.32e-09 4.48e-08 erg/cm2
Error 6.52e-10 3.22e-09 1.40e-07 8.25e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 8.56e-03 2.72e-02 7.10e-02 9.17e-01 6.12e-02 6.37e-01 ph/cm2/s
Error 5.45e-02 6.60e-02 8.85e-01 2.12e-01 9.35e-01 0.00e+00 ph/cm2/s
Fluence Band 1.08e-10 6.44e-10 3.34e-09 1.50e-07 4.41e-09 7.97e-08 erg/cm2
Error 6.46e-10 1.46e-09 2.99e-07 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.50e-04 1.51e-03 1.45e-02 1.52e+00 3.54e-02 6.23e-01 ph/cm2/s
Error 5.06e-02 6.25e-02 1.68e+00 2.05e-01 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 -0.382 0.000 - - 1.22e-03 1.91e-03 41.866 57
CPL -0.500 4.836 471.0 0.0 2.05e-03 1.93e-03 42.061 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.382 0.000 - - 1.22e-03 1.91e-03 41.866 57
CPL -0.500 4.836 471.0 0.0 2.05e-03 1.93e-03 42.061 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 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
278.8809 -42.7215 0.0752 29.5 35.1 0.0181 2.6 TRIG_00219136
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-64.199 -6.400 (delta_t = 57.799 [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 -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.382144 ( )
Norm@50keV : 1.219587E-03 ( -4.133640E-05 3.788393E-03) )
------------------------------------------------------------
Chi-Squared = 41.86622 using 59 PHA bins.
Reduced chi-squared = 0.7344951 for 57 degrees of freedom
Null hypothesis probability = 0.934
Photon flux (15-150 keV) in 0.3840 sec: 6.553896E-02 ( -0.065539 0.360166 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56138e-09 ( -4.56138e-09 1.34739e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.500309 ( -2.49969 7.17235 )
Epeak [keV] : 470.982 ( )
Norm@50keV : 2.049883E-03 ( -1.160211E-03 2.709592E-03) )
------------------------------------------------------------
Chi-Squared = 42.06053 using 59 PHA bins.
but latest trial 6.67204 gives Chi-Squared = 0.478924
Reduced chi-squared = 0.7510809 for 56 degrees of freedom
Null hypothesis probability = 0.916
Photon flux (15-150 keV) in 0.3840 sec: 6.117401E-02 ( -0.061174 0.362259 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.31551e-09 ( -2.83604e-09 1.367e-08 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.383700 ( -9.61630 5.38370 )
beta : 0.257647 ( -10.2576 9.74235 )
Epeak [keV] : 15.8555 ( -15.7555 9984.14 )
Norm@50keV : 2.224789E-03 ( -2.224789E-03 228516. )
------------------------------------------------------------
Chi-Squared = 41.86991 using 59 PHA bins.
Reduced chi-squared = 0.7612711 for 55 degrees of freedom
Null hypothesis probability = 0.904
Photon flux (15-150 keV) in 0.3840 sec: 3.543184E-02 ( -0.0354318 0.374107 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.40993e-09 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.382144 ( )
Norm@50keV : 1.219587E-03 ( -4.133640E-05 3.788393E-03) )
------------------------------------------------------------
Chi-Squared = 41.86622 using 59 PHA bins.
Reduced chi-squared = 0.7344951 for 57 degrees of freedom
Null hypothesis probability = 0.934
Photon flux (15-150 keV) in 0.3840 sec: 6.553896E-02 ( -0.065539 0.360166 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56138e-09 ( -4.56138e-09 1.34739e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.500309 ( -2.49969 7.17235 )
Epeak [keV] : 470.982 ( )
Norm@50keV : 2.049883E-03 ( -1.160211E-03 2.709592E-03) )
------------------------------------------------------------
Chi-Squared = 42.06053 using 59 PHA bins.
but latest trial 6.67204 gives Chi-Squared = 0.478924
Reduced chi-squared = 0.7510809 for 56 degrees of freedom
Null hypothesis probability = 0.916
Photon flux (15-150 keV) in 0.3840 sec: 6.117401E-02 ( -0.061174 0.362259 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.31551e-09 ( -2.83604e-09 1.367e-08 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.383700 ( -9.61630 5.38370 )
beta : 0.257647 ( -10.2576 9.74235 )
Epeak [keV] : 15.8555 ( -15.7555 9984.14 )
Norm@50keV : 2.224789E-03 ( -2.224789E-03 228516. )
------------------------------------------------------------
Chi-Squared = 41.86991 using 59 PHA bins.
Reduced chi-squared = 0.7612711 for 55 degrees of freedom
Null hypothesis probability = 0.904
Photon flux (15-150 keV) in 0.3840 sec: 3.543184E-02 ( -0.0354318 0.374107 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.40993e-09 ( 0 0 ) ergs/cm2
Plot creation:
Tue Jan 1 20:59:19 EST 2008