batgrbproduct Analysis for Trigger=349271
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): Wed Apr 15 12:30:35 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349271/GCN5_download_cron
======================================================================
Trigger: 00349271 Segment: 000
BAT Trigger Time: 261432337.12 [s; MET]
Trigger Stop: 261432337.152 [s; MET]
UTC: 2009-04-14T20:05:32.460860 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 261.050608210261 Dec: -41.4701730252255 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.6
Image Trigger?: NO
Rate S/N Ratio: 6.32455532033676 [ if not an image trigger ]
Image S/N Ratio: 5.6
Flight Position: [ source = BAT ]
RA: 261.050608210261 Dec: -41.4701730252255 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 261.068998554242 Dec: -41.4832791848425 [deg; J2000]
{ 17h 24m 16.6s , -41d 28' 59.8" }
+/- 3.95470740871875 [arcmin] (estimated 90% radius based on SNR)
+/- 2.24998620017307 [arcmin] (formal 1-sigma fit error)
SNR: 4.26675660324972
Angular difference between Flight and Ground position is 1.140976 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 0.0320000052452087 +/-
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
T50: 0.0320000052452087 +/-
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0320000052452087 second)
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.000041 0.004118 0.003805 -0.000150
0.001152 0.001312 0.001034 0.000881 [error]
Peak -0.000041 0.004118 0.003805 -0.000150
0.001152 0.001312 0.001034 0.000881 [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 4.48e-10 9.52e-10 1.58e-09 5.96e-09 4.35e-09 9.05e-09 erg/cm2
Error 3.49e-10 5.15e-10 9.16e-10 7.27e-09 2.38e-09 8.01e-09 erg/cm2
Peak flux Power-law 4.79e-01 5.12e-01 4.26e-01 5.92e-01 1.62e+00 1.93e+00 ph/cm2/s
Error 3.57e-01 2.87e-01 2.46e-01 7.43e-01 8.37e-01 1.08e+00 ph/cm2/s
Fluence Cutoff-PL 2.58e-10 1.47e-09 2.10e-09 3.85e-10 4.17e-09 4.20e-09 erg/cm2
Error 2.00e-10 6.76e-10 1.11e-09 7.36e-10 1.71e-09 1.81e-09 erg/cm2
Peak flux Cutoff-PL 2.42e-01 7.64e-01 6.15e-01 6.55e-02 1.68e+00 1.69e+00 ph/cm2/s
Error 1.96e-01 3.62e-01 3.05e-01 1.16e-01 6.75e-01 6.75e-01 ph/cm2/s
Fluence Band 3.44e-10 1.27e-09 2.30e-09 2.80e-10 4.04e-09 4.01e-09 erg/cm2
Error 1.12e-09 2.45e-10 1.70e-09 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.62e-01 7.77e-01 6.42e-01 3.41e-02 1.60e+00 1.61e+00 ph/cm2/s
Error 3.30e-01 2.69e-01 5.60e-02 6.18e-01 6.20e-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 1.322 0.758 - - 1.37e-02 1.03e-02 45.630 57
CPL -2.500 0.000 60.5 12.7 1.06e+00 2.30e+00 38.918 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.322 0.758 - - 1.37e-02 1.03e-02 45.630 57
CPL -2.500 0.000 60.5 12.7 1.06e+00 2.30e+00 38.918 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 0.032 0.000 0.032
T90 0.032 0.000 0.032
T50 0.032 0.000 0.032
Peak 0.032 0.000 0.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
261.0690 -41.4833 0.0451 21.0 -99.5 0.0089 4.3 TRIG_00349271
------------------------------------------
Foreground time interval of the image:
0.000 0.032 (delta_t = 0.032 [sec])
Background time interval of the image:
-60.120 -1.120 (delta_t = 59.000 [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 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32157 ( -0.817540 0.698047 )
Norm@50keV : 1.365797E-02 ( -1.365797E-02 6.906538E-03) )
------------------------------------------------------------
Chi-Squared = 45.62980 using 59 PHA bins.
Reduced chi-squared = 0.8005229 for 57 degrees of freedom
Null hypothesis probability = 0.860
Photon flux (15-150 keV) in 3.2000E-02 sec: 1.61837 ( -0.830385 0.84314 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.35472e-09 ( -2.32314e-09 2.44643e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49981 ( )
Epeak [keV] : 60.5097 ( -12.9699 12.4146 )
Norm@50keV : 1.06316 ( -1.26896 3.33442 )
------------------------------------------------------------
Chi-Squared = 38.91805 using 59 PHA bins.
but latest trial 81.5539 gives Chi-Squared = 3.63733
Reduced chi-squared = 0.6949651 for 56 degrees of freedom
Null hypothesis probability = 0.960
Photon flux (15-150 keV) in 3.2000E-02 sec: 1.68187 ( -0.67284 0.67666 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17258e-09 ( -1.71236e-09 1.70582e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.59487 ( -3.93765 8.151054E-03) )
beta : -9.36698 ( -1.811981E-05 0.628311 )
Epeak [keV] : 63.2965 ( -11.9801 13.1325 )
Norm@50keV : 0.976057 ( -5.74653 36.5193 )
------------------------------------------------------------
Chi-Squared = 38.92999 using 59 PHA bins.
Reduced chi-squared = 0.7078180 for 55 degrees of freedom
Null hypothesis probability = 0.950
Photon flux (15-150 keV) in 3.2000E-02 sec: 1.60148 ( -0.616939 0.61853 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.04314e-09 ( -1.59868e-09 1.80048e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32157 ( -0.817540 0.698047 )
Norm@50keV : 1.365797E-02 ( -1.365797E-02 6.906538E-03) )
------------------------------------------------------------
Chi-Squared = 45.62980 using 59 PHA bins.
Reduced chi-squared = 0.8005229 for 57 degrees of freedom
Null hypothesis probability = 0.860
Photon flux (15-150 keV) in 3.2000E-02 sec: 1.61837 ( -0.830385 0.84314 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.35472e-09 ( -2.32314e-09 2.44643e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49981 ( )
Epeak [keV] : 60.5097 ( -12.9699 12.4146 )
Norm@50keV : 1.06316 ( -1.26896 3.33442 )
------------------------------------------------------------
Chi-Squared = 38.91805 using 59 PHA bins.
but latest trial 81.5539 gives Chi-Squared = 3.63733
Reduced chi-squared = 0.6949651 for 56 degrees of freedom
Null hypothesis probability = 0.960
Photon flux (15-150 keV) in 3.2000E-02 sec: 1.68187 ( -0.67284 0.67666 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17258e-09 ( -1.71236e-09 1.70582e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.59487 ( -3.93345 8.151054E-03) )
beta : -9.36698 ( )
Epeak [keV] : 63.2965 ( )
Norm@50keV : 0.976057 ( )
------------------------------------------------------------
Chi-Squared = 38.92999 using 59 PHA bins.
Reduced chi-squared = 0.7078180 for 55 degrees of freedom
Null hypothesis probability = 0.950
Photon flux (15-150 keV) in 3.2000E-02 sec: 1.60148 ( -0.616939 0.61853 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.04314e-09 ( -1.59868e-09 1.80048e-09 ) ergs/cm2
Plot creation:
Wed Apr 15 12:47:55 EDT 2009