batgrbproduct Analysis for Trigger=349121
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 v2.44
Process Start Time (local time): Mon Apr 13 16:24:02 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349121/GCN5_download_cron
======================================================================
Trigger: 00349121 Segment: 000
BAT Trigger Time: 261296335.584 [s; MET]
Trigger Stop: 261296335.648 [s; MET]
UTC: 2009-04-13T06:18:50.929180 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 50.4106186132921 Dec: -35.975897766024 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.84
Image Trigger?: NO
Rate S/N Ratio: 8.30662386291807 [ if not an image trigger ]
Image S/N Ratio: 5.84
Flight Position: [ source = BAT ]
RA: 50.4106186132921 Dec: -35.975897766024 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 50.3368651177285 Dec: -35.9212566474221 [deg; J2000]
{ 03h 21m 20.8s , -35d 55' 16.5" }
+/- 4.11831909541793 [arcmin] (estimated 90% radius based on SNR)
+/- 2.81697590775949 [arcmin] (formal 1-sigma fit error)
SNR: 4.02667854409513
Angular difference between Flight and Ground position is 4.856125 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001196 -0.000603 0.005559 0.005389
0.001414 0.001551 0.001448 0.001622 [error]
Peak 0.001196 -0.000603 0.005559 0.005389
0.001414 0.001551 0.001448 0.001622 [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 4.90e-11 3.17e-10 1.76e-09 4.58e-08 5.86e-09 3.52e-08 erg/cm2
Error 1.55e-10 4.66e-10 1.43e-09 7.27e-08 3.05e-09 0.00e+00 erg/cm2
Peak flux Power-law 2.40e-02 8.08e-02 2.25e-01 1.89e+00 6.19e-01 2.22e+00 ph/cm2/s
Error 7.66e-02 1.24e-01 1.87e-01 2.71e+00 5.08e-01 2.81e+00 ph/cm2/s
Fluence Cutoff-PL 1.92e-11 2.41e-10 1.94e-09 1.61e-08 5.89e-09 1.83e-08 erg/cm2
Error 1.47e-10 4.55e-10 1.65e-09 7.97e-08 3.22e-09 4.99e-08 erg/cm2
Peak flux Cutoff-PL 2.39e-02 8.08e-02 2.26e-01 1.88e+00 6.20e-01 2.21e+00 ph/cm2/s
Error 7.64e-02 1.20e-01 1.87e-01 2.98e+00 5.08e-01 3.07e+00 ph/cm2/s
Fluence Band 3.39e-11 2.58e-10 1.93e-09 1.74e-08 5.90e-09 1.24e-08 erg/cm2
Error 4.53e-10 1.67e-09 1.23e-07 3.19e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 9.20e-03 5.99e-02 2.46e-01 8.36e-01 6.03e-01 1.35e+00 ph/cm2/s
Error 7.30e-02 1.21e-01 2.19e-01 3.29e+00 3.60e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.479 1.923 - - 3.73e-03 4.17e-03 51.793 57
CPL -1.348 4.430 346.0 5000.0 5.77e-03 6.74e-02 51.650 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.479 1.923 - - 3.73e-03 4.17e-03 51.793 57
CPL -1.348 4.430 346.0 5000.0 5.77e-03 6.74e-02 51.650 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
50.3369 -35.9213 0.0478 28.7 -162.5 0.0126 4.0 TRIG_00349121
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.584 -7.584 (delta_t = 53.000 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.479467 ( -2.52053 1.32525 )
Norm@50keV : 3.729017E-03 ( -3.729017E-03 4.607222E-03) )
------------------------------------------------------------
Chi-Squared = 51.79343 using 59 PHA bins.
Reduced chi-squared = 0.9086566 for 57 degrees of freedom
Null hypothesis probability = 0.670
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.619043 ( -0.619043 0.396747 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.85587e-09 ( -3.05356e-09 3.05389e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.34793 ( -1.65207 7.20858 )
Epeak [keV] : 345.963 ( -345.953 9654.04 )
Norm@50keV : 5.768063E-03 ( -5.768063E-03 0.128992 )
------------------------------------------------------------
Chi-Squared = 51.64967 using 59 PHA bins.
but latest trial 3.53075 gives Chi-Squared = 2.55098
Reduced chi-squared = 0.9223155 for 56 degrees of freedom
Null hypothesis probability = 0.640
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.619508 ( -0.619508 0.395912 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88763e-09 ( -3.25516e-09 3.17554e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.299040 ( -10.2990 4.70096 )
beta : 0.475608 ( -1.32273 9.52439 )
Epeak [keV] : 19.9488 ( -19.8488 9980.05 )
Norm@50keV : 6.615934E-03 ( -6.615934E-03 6582.34 )
------------------------------------------------------------
Chi-Squared = 51.79365 using 59 PHA bins.
Reduced chi-squared = 0.9417028 for 55 degrees of freedom
Null hypothesis probability = 0.598
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.602543 ( -0.320705 0.398297 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.89658e-09 ( -3.22195e-09 3.15891e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.479467 ( -2.52053 1.32525 )
Norm@50keV : 3.729017E-03 ( -3.729017E-03 4.607222E-03) )
------------------------------------------------------------
Chi-Squared = 51.79343 using 59 PHA bins.
Reduced chi-squared = 0.9086566 for 57 degrees of freedom
Null hypothesis probability = 0.670
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.619043 ( -0.619043 0.396747 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.85587e-09 ( -3.05356e-09 3.05389e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.34793 ( -1.65207 7.20858 )
Epeak [keV] : 345.963 ( -345.953 9654.04 )
Norm@50keV : 5.768063E-03 ( -5.768063E-03 0.128992 )
------------------------------------------------------------
Chi-Squared = 51.64967 using 59 PHA bins.
but latest trial 3.53075 gives Chi-Squared = 2.55098
Reduced chi-squared = 0.9223155 for 56 degrees of freedom
Null hypothesis probability = 0.640
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.619508 ( -0.619508 0.395912 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88763e-09 ( -3.25516e-09 3.17554e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.299040 ( -10.2990 4.70096 )
beta : 0.475608 ( -1.32273 9.52439 )
Epeak [keV] : 19.9488 ( -19.8488 9980.05 )
Norm@50keV : 6.615934E-03 ( -6.615934E-03 6582.34 )
------------------------------------------------------------
Chi-Squared = 51.79365 using 59 PHA bins.
Reduced chi-squared = 0.9417028 for 55 degrees of freedom
Null hypothesis probability = 0.598
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.602543 ( -0.320705 0.398297 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.89658e-09 ( -3.22195e-09 3.15891e-09 ) ergs/cm2
Plot creation:
Mon Apr 13 16:44:00 EDT 2009