batgrbproduct Analysis for Trigger=287247
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 07:50:14 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger287247/GCN5_download_cron
======================================================================
Trigger: 00287247 Segment: 000
BAT Trigger Time: 208260248 [s; MET]
Trigger Stop: 208260312 [s; MET]
UTC: 2007-08-08T10:04:05.858660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.964310293674 Dec: -37.8417469563072 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 19.78
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 19.78
Flight Position: [ source = BAT ]
RA: 255.964310293674 Dec: -37.8417469563072 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.939166592335 Dec: -37.8415446729147 [deg; J2000]
{ 17h 03m 45.4s , -37d 50' 29.6" }
+/- 1.46931241867955 [arcmin] (estimated 90% radius based on SNR)
+/- 0.637376646006549 [arcmin] (formal 1-sigma fit error)
SNR: 17.5543147496227
RA = 17h 3m 45.4s (255.939167 deg.)
Dec = -37d 50' 30" (-37.841545 deg.)
Angular difference between Flight and Ground position is 1.191435 arcmin
Partial Coding Fraction: 0.890625 [ 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 0.532537 0.422463 0.097405 -0.013373
0.034888 0.030935 0.026072 0.023407 [error]
Peak 0.532537 0.422463 0.097405 -0.013373
0.034888 0.030935 0.026072 0.023407 [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 1.85e-07 1.67e-07 1.04e-07 9.85e-08 4.97e-07 5.55e-07 erg/cm2
Error 2.19e-08 1.68e-08 2.15e-08 3.83e-08 5.14e-08 7.06e-08 erg/cm2
Peak flux Power-law 1.85e-01 9.34e-02 2.91e-02 1.15e-02 3.14e-01 3.19e-01 ph/cm2/s
Error 2.24e-02 9.09e-03 5.82e-03 4.21e-03 2.86e-02 2.88e-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 1.73e-07 1.84e-07 7.55e-08 2.72e-08 4.51e-07 4.69e-07 erg/cm2
Error 2.30e-08 2.10e-08 2.23e-08 2.40e-08 5.51e-08 8.06e-08 erg/cm2
Peak flux Band 1.72e-01 1.04e-01 2.19e-02 3.50e-03 3.01e-01 3.04e-01 ph/cm2/s
Error 2.45e-02 8.66e-03 6.13e-03 5.28e-03 2.91e-02 3.05e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.684 0.207 - - 1.42e-03 2.15e-04 48.322 57
CPL 1.377 0.000 16.1 0.0 9.95e-03 0.00e+00 43.352 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.684 0.207 - - 1.42e-03 2.15e-04 48.322 57
CPL 1.377 0.000 16.1 0.0 9.95e-03 0.00e+00 43.352 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
255.9392 -37.8415 0.0110 25.9 -152.0 1.0588 17.6 TRIG_00287247
------------------------------------------
Foreground time interval of the image:
0.000 33.060 (delta_t = 33.060 [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 33.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.68418 ( -0.200310 0.212983 )
Norm@50keV : 1.421831E-03 ( -2.144023E-04 2.149116E-04) )
------------------------------------------------------------
Chi-Squared = 48.32243 using 59 PHA bins.
Reduced chi-squared = 0.8477619 for 57 degrees of freedom
Null hypothesis probability = 0.787
Photon flux (15-150 keV) in 33.06 sec: 0.314027 ( -0.0286 0.028632 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.97275e-07 ( -5.08231e-08 5.20298e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37732 ( )
Epeak [keV] : 16.1137 ( )
Norm@50keV : 9.954041E-03 ( )
------------------------------------------------------------
Chi-Squared = 43.35181 using 59 PHA bins.
Reduced chi-squared = 0.7741395 for 56 degrees of freedom
Null hypothesis probability = 0.892
Photon flux (15-150 keV) in 33.06 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73434 ( -8.26566 3.009784E-02) )
beta : -4.80838 ( -7.05161 0.393043 )
Epeak [keV] : 6.85581 ( -5.55680 16.1397 )
Norm@50keV : 7.908646E-03 ( -2.601733E-03 2.12299 )
------------------------------------------------------------
Chi-Squared = 47.97911 using 59 PHA bins.
Reduced chi-squared = 0.8723474 for 55 degrees of freedom
Null hypothesis probability = 0.738
Photon flux (15-150 keV) in 33.06 sec: 0.300926 ( -0.029749 0.028413 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50793e-07 ( -5.18711e-08 5.82517e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.68418 ( -0.200310 0.212983 )
Norm@50keV : 1.421831E-03 ( -2.144023E-04 2.149116E-04) )
------------------------------------------------------------
Chi-Squared = 48.32243 using 59 PHA bins.
Reduced chi-squared = 0.8477619 for 57 degrees of freedom
Null hypothesis probability = 0.787
Photon flux (15-150 keV) in 33.06 sec: 0.314027 ( -0.0286 0.028632 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.97275e-07 ( -5.08231e-08 5.20298e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37732 ( )
Epeak [keV] : 16.1137 ( )
Norm@50keV : 9.954041E-03 ( )
------------------------------------------------------------
Chi-Squared = 43.35181 using 59 PHA bins.
Reduced chi-squared = 0.7741395 for 56 degrees of freedom
Null hypothesis probability = 0.892
Photon flux (15-150 keV) in 33.06 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73434 ( -8.26566 3.009784E-02) )
beta : -4.80838 ( -7.05161 0.393043 )
Epeak [keV] : 6.85581 ( -5.55680 16.1397 )
Norm@50keV : 7.908646E-03 ( -2.601733E-03 2.12299 )
------------------------------------------------------------
Chi-Squared = 47.97911 using 59 PHA bins.
Reduced chi-squared = 0.8723474 for 55 degrees of freedom
Null hypothesis probability = 0.738
Photon flux (15-150 keV) in 33.06 sec: 0.300926 ( -0.029749 0.028413 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50793e-07 ( -5.18711e-08 5.82517e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 07:54:11 EST 2007