batgrbproduct Analysis for Trigger=288600
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 11:04:59 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger288600/GCN5_download_cron
======================================================================
Trigger: 00288600 Segment: 000
BAT Trigger Time: 210629736 [s; MET]
Trigger Stop: 210629800 [s; MET]
UTC: 2007-09-04T20:15:33.798220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.6146144658891 Dec: 22.0097906639837 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 15
Flight Position: [ source = BAT ]
RA: 83.6146144658891 Dec: 22.0097906639837 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 83.6066555040961 Dec: 21.9970378424043 [deg; J2000]
{ 05h 34m 25.6s , +21d 59' 49.3" }
+/- 1.7487635951356 [arcmin] (estimated 90% radius based on SNR)
+/- 0.74613196259775 [arcmin] (formal 1-sigma fit error)
SNR: 13.688619772446
RA = 5h 34m 25.6s (83.606656 deg.)
Dec = 21d 59' 49" (21.997038 deg.)
Angular difference between Flight and Ground position is 0.884034 arcmin
Partial Coding Fraction: 0.375 [ 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 0.490113 0.455335 0.198588 0.119221
0.050580 0.050842 0.045539 0.041331 [error]
Peak 0.490113 0.455335 0.198588 0.119221
0.050580 0.050842 0.045539 0.041331 [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 1.89e-07 2.19e-07 1.83e-07 2.58e-07 6.83e-07 8.47e-07 erg/cm2
Error 3.45e-08 2.82e-08 4.67e-08 1.32e-07 1.03e-07 1.83e-07 erg/cm2
Peak flux Power-law 1.87e-01 1.21e-01 5.04e-02 2.87e-02 3.72e-01 3.86e-01 ph/cm2/s
Error 3.50e-02 1.52e-02 1.24e-02 1.36e-02 4.70e-02 4.81e-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 1.81e-07 2.19e-07 1.89e-07 2.78e-07 6.86e-07 9.19e-07 erg/cm2
Error 2.82e-08 2.76e-08 3.10e-08 9.24e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.77e-01 1.21e-01 5.26e-02 3.12e-02 3.71e-01 3.84e-01 ph/cm2/s
Error 2.95e-02 1.65e-02 7.46e-03 1.63e-02 4.63e-02 5.23e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.258 0.281 - - 2.18e-03 3.93e-04 75.629 57
CPL 1.994 0.000 1.6 0.0 2.79e-03 0.00e+00 77.088 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.258 0.281 - - 2.18e-03 3.93e-04 75.629 57
CPL 1.994 0.000 1.6 0.0 2.79e-03 0.00e+00 77.088 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
83.6067 +21.9970 0.0142 46.7 -15.1 1.3567 13.7 TRIG_00288600
------------------------------------------
Foreground time interval of the image:
0.000 33.067 (delta_t = 33.067 [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 33.067 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.25770 ( -0.268300 0.293133 )
Norm@50keV : 2.179192E-03 ( -4.027481E-04 3.842246E-04) )
------------------------------------------------------------
Chi-Squared = 75.62860 using 59 PHA bins.
Reduced chi-squared = 1.326818 for 57 degrees of freedom
Null hypothesis probability = 4.996E-02
Photon flux (15-150 keV) in 33.07 sec: 0.372075 ( -0.046924 0.046995 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.83425e-07 ( -1.01393e-07 1.04131e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.067 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99416 ( )
Epeak [keV] : 1.57003 ( )
Norm@50keV : 2.790778E-03 ( )
------------------------------------------------------------
Chi-Squared = 77.08772 using 59 PHA bins.
Reduced chi-squared = 1.376566 for 56 degrees of freedom
Null hypothesis probability = 3.234E-02
Photon flux (15-150 keV) in 33.07 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.067 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59710 ( -7.76290 7.23710 )
beta : -2.24726 ( -0.292948 0.268198 )
Epeak [keV] : 10.5533 ( -10.4533 9989.45 )
Norm@50keV : 8.454197E-03 ( -5.475694E-02 5.221665E-02) )
------------------------------------------------------------
Chi-Squared = 75.64806 using 59 PHA bins.
Reduced chi-squared = 1.375419 for 55 degrees of freedom
Null hypothesis probability = 3.384E-02
Photon flux (15-150 keV) in 33.07 sec: 0.370817 ( -0.046169 0.046382 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.86384e-07 ( -9.98053e-08 8.50891e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.067 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.25770 ( -0.268300 0.293133 )
Norm@50keV : 2.179192E-03 ( -4.027481E-04 3.842246E-04) )
------------------------------------------------------------
Chi-Squared = 75.62860 using 59 PHA bins.
Reduced chi-squared = 1.326818 for 57 degrees of freedom
Null hypothesis probability = 4.996E-02
Photon flux (15-150 keV) in 33.07 sec: 0.372075 ( -0.046924 0.046995 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.83425e-07 ( -1.01393e-07 1.04131e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.067 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99416 ( )
Epeak [keV] : 1.57003 ( )
Norm@50keV : 2.790778E-03 ( )
------------------------------------------------------------
Chi-Squared = 77.08772 using 59 PHA bins.
Reduced chi-squared = 1.376566 for 56 degrees of freedom
Null hypothesis probability = 3.234E-02
Photon flux (15-150 keV) in 33.07 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.067 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59710 ( -7.76290 7.23710 )
beta : -2.24726 ( -0.292948 0.268198 )
Epeak [keV] : 10.5533 ( -10.4533 9989.45 )
Norm@50keV : 8.454197E-03 ( -5.475694E-02 5.221665E-02) )
------------------------------------------------------------
Chi-Squared = 75.64806 using 59 PHA bins.
Reduced chi-squared = 1.375419 for 55 degrees of freedom
Null hypothesis probability = 3.384E-02
Photon flux (15-150 keV) in 33.07 sec: 0.370817 ( -0.046169 0.046382 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.86384e-07 ( -9.98053e-08 8.50891e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 11:10:26 EST 2007