batgrbproduct Analysis for Trigger=303436
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): Sun Feb 17 13:38:20 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger303436/GCN5_download_cron
======================================================================
Trigger: 00303436 Segment: 000
BAT Trigger Time: 224894640 [s; MET]
Trigger Stop: 224894704 [s; MET]
UTC: 2008-02-16T22:43:57.420220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.302893633731 Dec: -26.6213280868123 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 10.31
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.31
Flight Position: [ source = BAT ]
RA: 267.302893633731 Dec: -26.6213280868123 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.297025865001 Dec: -26.6490782976636 [deg; J2000]
{ 17h 49m 11.3s , -26d 38' 56.7" }
+/- 2.64819809284232 [arcmin] (estimated 90% radius based on SNR)
+/- 1.52082306977211 [arcmin] (formal 1-sigma fit error)
SNR: 7.5666461524506
RA = 17h 49m 11.3s (267.297026 deg.)
Dec = -26d 38' 57" (-26.649078 deg.)
Angular difference between Flight and Ground position is 1.694493 arcmin
Partial Coding Fraction: 1.015625 [ 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 0.492451 0.237291 -0.039783 0.022445
0.048479 0.041959 0.034975 0.029556 [error]
Peak 0.492451 0.237291 -0.039783 0.022445
0.048479 0.041959 0.034975 0.029556 [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 1.47e-07 7.94e-08 2.68e-08 1.17e-08 2.60e-07 2.65e-07 erg/cm2
Error 2.48e-08 2.14e-08 1.52e-08 1.20e-08 5.11e-08 5.56e-08 erg/cm2
Peak flux Power-law 7.74e-02 2.37e-02 4.01e-03 7.82e-04 1.06e-01 1.06e-01 ph/cm2/s
Error 1.33e-02 6.06e-03 2.20e-03 8.95e-04 1.71e-02 1.72e-02 ph/cm2/s
Fluence Cutoff-PL 1.51e-07 8.28e-08 5.43e-09 1.37e-11 2.40e-07 2.40e-07 erg/cm2
Error 2.70e-08 2.64e-08 1.10e-08 1.20e-09 4.24e-08 4.24e-08 erg/cm2
Peak flux Cutoff-PL 7.83e-02 2.56e-02 9.24e-04 1.25e-06 1.05e-01 1.05e-01 ph/cm2/s
Error 1.45e-02 7.52e-03 1.76e-03 9.60e-05 1.65e-02 1.67e-02 ph/cm2/s
Fluence Band 1.46e-07 7.81e-08 2.61e-08 1.13e-08 2.57e-07 2.62e-07 erg/cm2
Error 2.42e-08 1.68e-08 1.09e-08 1.03e-08 3.29e-08 4.51e-08 erg/cm2
Peak flux Band 7.68e-02 2.43e-02 4.29e-03 9.21e-04 1.09e-01 1.04e-01 ph/cm2/s
Error 1.25e-02 2.98e-03 1.45e-03 4.93e-04 1.74e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.564 0.475 - - 2.48e-04 1.08e-04 66.168 57
CPL 0.339 3.021 13.4 7.8 6.28e-02 5.32e+00 61.472 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.564 0.475 - - 2.48e-04 1.08e-04 66.168 57
CPL 0.339 2.539 13.4 7.8 6.28e-02 5.32e+00 61.472 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 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
267.2970 -26.6491 0.0253 4.2 -135.7 0.6676 7.6 TRIG_00303436
------------------------------------------
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: 3.56448 ( -0.438280 0.511671 )
Norm@50keV : 2.477915E-04 ( -9.837214E-05 1.170234E-04) )
------------------------------------------------------------
Chi-Squared = 66.16850 using 59 PHA bins.
Reduced chi-squared = 1.160851 for 57 degrees of freedom
Null hypothesis probability = 0.190
Photon flux (15-150 keV) in 64.00 sec: 0.105624 ( -0.0171338 0.017163 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.59624e-07 ( -4.9497e-08 5.27226e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.339486 ( -3.33949 2.70337 )
Epeak [keV] : 13.3903 ( -10.5753 4.98560 )
Norm@50keV : 6.284638E-02 ( -6.284638E-02 10.5857 )
------------------------------------------------------------
Chi-Squared = 61.47199 using 59 PHA bins.
but latest trial 4.10152 gives Chi-Squared = 0.730434
Reduced chi-squared = 1.097714 for 56 degrees of freedom
Null hypothesis probability = 0.286
Photon flux (15-150 keV) in 64.00 sec: 0.104814 ( -0.016566 0.016478 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3977e-07 ( -4.11616e-08 4.37024e-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 : -1.69973 ( -7.56661 0.366832 )
beta : -8.94064 ( -0.511274 0.439435 )
Epeak [keV] : 7.73115 ( -7.63115 9992.27 )
Norm@50keV : 2.705506E-03 ( -3.150508E-02 0.829754 )
------------------------------------------------------------
Chi-Squared = 70.38883 using 59 PHA bins.
Reduced chi-squared = 1.279797 for 55 degrees of freedom
Null hypothesis probability = 7.906E-02
Photon flux (15-150 keV) in 64.00 sec: 0.108539 ( -0.0173741 0.017349 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57404e-07 ( -4.11392e-08 2.47386e-08 ) 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: 3.56448 ( -0.438280 0.511671 )
Norm@50keV : 2.477915E-04 ( -9.837214E-05 1.170234E-04) )
------------------------------------------------------------
Chi-Squared = 66.16850 using 59 PHA bins.
Reduced chi-squared = 1.160851 for 57 degrees of freedom
Null hypothesis probability = 0.190
Photon flux (15-150 keV) in 64.00 sec: 0.105624 ( -0.0171338 0.017163 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.59624e-07 ( -4.9497e-08 5.27226e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.339486 ( -3.33949 1.73755 )
Epeak [keV] : 13.3903 ( -10.5753 4.98560 )
Norm@50keV : 6.284638E-02 ( -6.284638E-02 10.5857 )
------------------------------------------------------------
Chi-Squared = 61.47199 using 59 PHA bins.
but latest trial 4.10152 gives Chi-Squared = 0.730434
Reduced chi-squared = 1.097714 for 56 degrees of freedom
Null hypothesis probability = 0.286
Photon flux (15-150 keV) in 64.00 sec: 0.104814 ( -0.016566 0.016478 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3977e-07 ( -4.11616e-08 4.37024e-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 : -1.69973 ( -7.56661 0.366832 )
beta : -8.94064 ( )
Epeak [keV] : 7.73115 ( )
Norm@50keV : 2.705506E-03 ( )
------------------------------------------------------------
Chi-Squared = 70.38883 using 59 PHA bins.
Reduced chi-squared = 1.279797 for 55 degrees of freedom
Null hypothesis probability = 7.906E-02
Photon flux (15-150 keV) in 64.00 sec: 0.108539 ( -0.0173741 0.017349 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57404e-07 ( -4.11392e-08 2.47386e-08 ) ergs/cm2
Plot creation:
Sun Feb 17 14:20:31 EST 2008