batgrbproduct Analysis for Trigger=286412
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 06:02:39 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger286412/GCN5_download_cron
======================================================================
Trigger: 00286412 Segment: 000
BAT Trigger Time: 207403656 [s; MET]
Trigger Stop: 207403720 [s; MET]
UTC: 2007-07-29T12:07:33.880500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.049478996886 Dec: -45.1944315374482 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.98
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.98
Flight Position: [ source = BAT ]
RA: 252.049478996886 Dec: -45.1944315374482 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.057295350992 Dec: -45.1825670827085 [deg; J2000]
{ 16h 48m 13.8s , -45d 10' 57.2" }
+/- 2.57316211012959 [arcmin] (estimated 90% radius based on SNR)
+/- 1.40716796843622 [arcmin] (formal 1-sigma fit error)
SNR: 7.88382072988129
RA = 16h 48m 13.8s (252.057295 deg.)
Dec = -45d 10' 57" (-45.182567 deg.)
Angular difference between Flight and Ground position is 0.784859 arcmin
Partial Coding Fraction: 0.984375 [ 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 0.219871 0.194674 0.025633 0.008689
0.028928 0.027184 0.022967 0.020068 [error]
Peak 0.219871 0.194674 0.025633 0.008689
0.028928 0.027184 0.022967 0.020068 [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 7.19e-08 6.97e-08 4.72e-08 5.01e-08 2.09e-07 2.39e-07 erg/cm2
Error 1.43e-08 1.36e-08 1.84e-08 3.66e-08 4.40e-08 6.49e-08 erg/cm2
Peak flux Power-law 7.16e-02 3.88e-02 1.31e-02 5.77e-03 1.27e-01 1.29e-01 ph/cm2/s
Error 1.45e-02 7.30e-03 4.96e-03 3.94e-03 2.09e-02 2.15e-02 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 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
Fluence Band 6.84e-08 7.99e-08 3.44e-08 4.23e-09 1.87e-07 1.87e-07 erg/cm2
Error 1.13e-08 1.74e-08 1.07e-08 3.09e-08 3.42e-08 6.25e-08 erg/cm2
Peak flux Band 6.74e-02 4.48e-02 9.93e-03 6.05e-04 1.23e-01 1.23e-01 ph/cm2/s
Error 1.14e-02 7.73e-03 2.77e-03 1.97e-03 2.00e-02 1.51e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.562 0.371 - - 6.21e-04 1.79e-04 40.813 57
CPL 1.027 0.000 21.6 0.0 6.17e-03 0.00e+00 38.472 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.562 0.371 - - 6.21e-04 1.79e-04 40.813 57
CPL 1.027 0.000 21.6 0.0 6.17e-03 0.00e+00 38.472 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
252.0573 -45.1826 0.0243 18.7 -9.0 0.4187 7.9 TRIG_00286412
------------------------------------------
Foreground time interval of the image:
0.000 33.095 (delta_t = 33.095 [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 33.095 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.56185 ( -0.343816 0.398199 )
Norm@50keV : 6.206341E-04 ( -1.787241E-04 1.793572E-04) )
------------------------------------------------------------
Chi-Squared = 40.81318 using 59 PHA bins.
Reduced chi-squared = 0.7160208 for 57 degrees of freedom
Null hypothesis probability = 0.948
Photon flux (15-150 keV) in 33.10 sec: 0.126690 ( -0.020895 0.020901 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08996e-07 ( -4.27536e-08 4.52679e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02679 ( )
Epeak [keV] : 21.6006 ( )
Norm@50keV : 6.172294E-03 ( )
------------------------------------------------------------
Chi-Squared = 38.47213 using 59 PHA bins.
Reduced chi-squared = 0.6870024 for 56 degrees of freedom
Null hypothesis probability = 0.964
Photon flux (15-150 keV) in 33.10 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62717 ( -8.37283 0.120468 )
beta : -8.85713 ( -7.18287 0.566819 )
Epeak [keV] : 9.30277 ( -9.20471 25.4824 )
Norm@50keV : 3.523577E-03 ( -5.118280E-04 178.195 )
------------------------------------------------------------
Chi-Squared = 40.66132 using 59 PHA bins.
Reduced chi-squared = 0.7392968 for 55 degrees of freedom
Null hypothesis probability = 0.925
Photon flux (15-150 keV) in 33.10 sec: 0.122769 ( -0.019986 0.019985 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86758e-07 ( -3.79213e-08 3.04027e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.56185 ( -0.343816 0.398199 )
Norm@50keV : 6.206341E-04 ( -1.787241E-04 1.793572E-04) )
------------------------------------------------------------
Chi-Squared = 40.81318 using 59 PHA bins.
Reduced chi-squared = 0.7160208 for 57 degrees of freedom
Null hypothesis probability = 0.948
Photon flux (15-150 keV) in 33.10 sec: 0.126690 ( -0.020895 0.020901 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08996e-07 ( -4.27536e-08 4.52679e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02679 ( )
Epeak [keV] : 21.6006 ( )
Norm@50keV : 6.172294E-03 ( )
------------------------------------------------------------
Chi-Squared = 38.47213 using 59 PHA bins.
Reduced chi-squared = 0.6870024 for 56 degrees of freedom
Null hypothesis probability = 0.964
Photon flux (15-150 keV) in 33.10 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62717 ( -8.37283 0.120468 )
beta : -8.85713 ( -7.18287 0.566819 )
Epeak [keV] : 9.30277 ( -9.20471 25.4824 )
Norm@50keV : 3.523577E-03 ( -5.118280E-04 178.195 )
------------------------------------------------------------
Chi-Squared = 40.66132 using 59 PHA bins.
Reduced chi-squared = 0.7392968 for 55 degrees of freedom
Null hypothesis probability = 0.925
Photon flux (15-150 keV) in 33.10 sec: 0.122769 ( -0.019986 0.019985 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86758e-07 ( -3.79213e-08 3.04027e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 06:08:31 EST 2007