batgrbproduct Analysis for Trigger=310319
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): Mon Apr 28 08:31:00 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger310319/GCN5_download_cron
======================================================================
Trigger: 00310319 Segment: 000
BAT Trigger Time: 231014147.328 [s; MET]
Trigger Stop: 231014151.424 [s; MET]
UTC: 2008-04-27T18:35:44.579020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.545651000519 Dec: -29.0098729599755 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.83
Image Trigger?: NO
Rate S/N Ratio: 8 [ if not an image trigger ]
Image S/N Ratio: 6.83
Flight Position: [ source = BAT ]
RA: 267.545651000519 Dec: -29.0098729599755 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.614182806102 Dec: -29.0817505816022 [deg; J2000]
{ 17h 50m 27.4s , -29d 04' 54.3" }
+/- 4.26226935683136 [arcmin] (estimated 90% radius based on SNR)
+/- 2.86069323324166 [arcmin] (formal 1-sigma fit error)
SNR: 3.83381711425954
RA = 17h 50m 27.4s (267.614183 deg.)
Dec = -29d 4' 54" (-29.081751 deg.)
Angular difference between Flight and Ground position is 5.614385 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 4.0959999859333 +/-
Measured from: 0
to: 4.0959999859333 [s; relative to TRIGTIME]
T50: 4.0959999859333 +/-
Measured from: 0
to: 4.0959999859333 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 4.0959999859333 second)
Measured from: -1.49011611938477e-08
to: 4.09599997103214 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 4.0959999859333 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.095138 0.006192 0.000445 -0.015788
0.012364 0.010381 0.009084 0.008574 [error]
Peak 0.095138 0.006192 0.000445 -0.015788
0.012364 0.010381 0.009084 0.008574 [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 2.51e-08 8.11e-09 1.46e-09 3.07e-10 3.48e-08 3.49e-08 erg/cm2
Error 5.87e-09 4.54e-09 1.82e-09 8.05e-10 1.05e-08 1.08e-08 erg/cm2
Peak flux Power-law 2.10e-01 3.91e-02 3.53e-03 3.45e-04 2.53e-01 2.53e-01 ph/cm2/s
Error 4.90e-02 2.08e-02 4.70e-03 8.44e-04 6.35e-02 6.36e-02 ph/cm2/s
Fluence Cutoff-PL 2.51e-08 8.11e-09 1.46e-09 3.05e-10 3.48e-08 3.50e-08 erg/cm2
Error 5.87e-09 4.55e-09 1.82e-09 7.98e-10 1.06e-08 1.08e-08 erg/cm2
Peak flux Cutoff-PL 2.36e-01 2.34e-02 1.87e-05 2.62e-12 2.60e-01 2.60e-01 ph/cm2/s
Error 5.38e-02 2.00e-02 2.07e-03 1.04e-05 6.07e-02 6.08e-02 ph/cm2/s
Fluence Band 2.75e-08 5.41e-09 2.14e-10 8.64e-12 3.33e-08 3.17e-08 erg/cm2
Error 6.91e-09 3.81e-09 1.12e-09 1.92e-10 9.53e-09 9.61e-09 erg/cm2
Peak flux Band 2.10e-01 3.91e-02 3.52e-03 1.41e-04 2.54e-01 2.53e-01 ph/cm2/s
Error 4.90e-02 2.08e-02 4.69e-03 6.21e-02 6.36e-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 4.471 0.926 - - 2.69e-04 2.99e-04 51.434 57
CPL 0.194 0.000 8.6 8.0 1.06e+00 9.10e+02 49.397 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.471 0.926 - - 2.69e-04 2.99e-04 51.434 57
CPL 0.194 0.000 8.6 8.0 1.06e+00 9.10e+02 49.397 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 4.096 0.000 4.096
T90 4.096 0.000 4.096
T50 4.096 0.000 4.096
Peak 4.096 -0.000 4.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.6142 -29.0818 0.0499 1.1 -101.4 0.0761 3.8 TRIG_00310319
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-239.328 -19.328 (delta_t = 220.000 [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 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.47125 ( -0.815117 1.03603 )
Norm@50keV : 2.687708E-04 ( -2.687708E-04 3.298535E-04) )
------------------------------------------------------------
Chi-Squared = 51.43378 using 59 PHA bins.
Reduced chi-squared = 0.9023470 for 57 degrees of freedom
Null hypothesis probability = 0.683
Photon flux (15-150 keV) in 4.096 sec: 0.252812 ( -0.063221 0.063785 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48437e-08 ( -1.00304e-08 1.1068e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.194157 ( )
Epeak [keV] : 8.57445 ( -13.3055 2.64997 )
Norm@50keV : 1.06062 ( -475.453 1344.66 )
------------------------------------------------------------
Chi-Squared = 49.39726 using 59 PHA bins.
Reduced chi-squared = 0.8820940 for 56 degrees of freedom
Null hypothesis probability = 0.721
Photon flux (15-150 keV) in 4.096 sec: 0.259871 ( -0.060575 0.06076 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48386e-08 ( -1.0034e-08 1.10669e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.84683 ( -1.15317 13.8468 )
beta : -4.46956 ( -1.03857 0.813362 )
Epeak [keV] : 2.63223 ( -2.53223 9997.37 )
Norm@50keV : 3.659084E-02 ( -3.659084E-02 4.477148E-02) )
------------------------------------------------------------
Chi-Squared = 51.43378 using 59 PHA bins.
Reduced chi-squared = 0.9351596 for 55 degrees of freedom
Null hypothesis probability = 0.612
Photon flux (15-150 keV) in 4.096 sec: 0.254020 ( -0.061312 0.062832 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32911e-08 ( -8.91949e-09 1.01339e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.47125 ( -0.815117 1.03603 )
Norm@50keV : 2.687708E-04 ( -2.687708E-04 3.298535E-04) )
------------------------------------------------------------
Chi-Squared = 51.43378 using 59 PHA bins.
Reduced chi-squared = 0.9023470 for 57 degrees of freedom
Null hypothesis probability = 0.683
Photon flux (15-150 keV) in 4.096 sec: 0.252812 ( -0.063221 0.063785 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48437e-08 ( -1.00304e-08 1.1068e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.194157 ( )
Epeak [keV] : 8.57445 ( -13.3055 2.64997 )
Norm@50keV : 1.06062 ( -475.453 1344.66 )
------------------------------------------------------------
Chi-Squared = 49.39726 using 59 PHA bins.
Reduced chi-squared = 0.8820940 for 56 degrees of freedom
Null hypothesis probability = 0.721
Photon flux (15-150 keV) in 4.096 sec: 0.259871 ( -0.060575 0.06076 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48386e-08 ( -1.0034e-08 1.10669e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.84683 ( -1.15317 13.8468 )
beta : -4.46956 ( -1.03857 0.813362 )
Epeak [keV] : 2.63223 ( -2.53223 9997.37 )
Norm@50keV : 3.659084E-02 ( -3.659084E-02 4.477148E-02) )
------------------------------------------------------------
Chi-Squared = 51.43378 using 59 PHA bins.
Reduced chi-squared = 0.9351596 for 55 degrees of freedom
Null hypothesis probability = 0.612
Photon flux (15-150 keV) in 4.096 sec: 0.254020 ( -0.061312 0.062832 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32911e-08 ( -8.91949e-09 1.01339e-08 ) ergs/cm2
Plot creation:
Mon Apr 28 08:57:40 EDT 2008