batgrbproduct Analysis for Trigger=349441
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): Fri Apr 17 14:36:16 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349441/GCN5_download_cron
======================================================================
Trigger: 00349441 Segment: 000
BAT Trigger Time: 261658243.136 [s; MET]
Trigger Stop: 261658259.52 [s; MET]
UTC: 2009-04-17T10:50:38.469720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 240.258829828141 Dec: -46.8833363262028 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.77
Image Trigger?: NO
Rate S/N Ratio: 11.4891252930761 [ if not an image trigger ]
Image S/N Ratio: 5.77
Flight Position: [ source = BAT ]
RA: 240.258829828141 Dec: -46.8833363262028 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 240.330874873103 Dec: -46.9301606950861 [deg; J2000]
{ 16h 01m 19.4s , -46d 55' 48.6" }
+/- 4.02092531444135 [arcmin] (estimated 90% radius based on SNR)
+/- 2.56077560197135 [arcmin] (formal 1-sigma fit error)
SNR: 4.16673147799213
Angular difference between Flight and Ground position is 4.076097 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 16.3840000033379 +/-
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
T50: 16.3840000033379 +/-
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 16.3840000033379 second)
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 16.3840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.127537 0.006170 -0.016786 -0.021144
0.027995 0.021498 0.018171 0.015561 [error]
Peak 0.127537 0.006170 -0.016786 -0.021144
0.027995 0.021498 0.018171 0.015561 [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 2.41e-08 1.21e-08 3.73e-09 1.46e-09 4.07e-08 4.05e-08 erg/cm2
Error 1.20e-08 9.07e-09 6.09e-09 5.74e-09 2.37e-08 2.56e-08 erg/cm2
Peak flux Power-law 4.97e-02 1.42e-02 2.19e-03 3.85e-04 6.63e-02 6.63e-02 ph/cm2/s
Error 2.48e-02 1.02e-02 3.45e-03 1.35e-03 3.33e-02 3.34e-02 ph/cm2/s
Fluence Cutoff-PL 2.41e-08 1.21e-08 3.73e-09 1.46e-09 4.07e-08 4.12e-08 erg/cm2
Error 1.20e-08 9.07e-09 6.09e-09 5.68e-09 2.37e-08 2.55e-08 erg/cm2
Peak flux Cutoff-PL 4.97e-02 1.42e-02 2.18e-03 3.82e-04 6.63e-02 6.63e-02 ph/cm2/s
Error 2.50e-02 1.02e-02 3.44e-03 1.34e-03 3.33e-02 3.34e-02 ph/cm2/s
Fluence Band 3.13e-08 9.62e-09 1.05e-10 6.50e-13 4.17e-08 4.64e-08 erg/cm2
Error 1.31e-08 7.88e-09 8.07e-11 4.57e-10 1.85e-08 2.28e-08 erg/cm2
Peak flux Band 5.17e-02 1.84e-02 1.21e-03 1.09e-05 7.12e-02 7.14e-02 ph/cm2/s
Error 2.68e-02 1.10e-02 2.81e-03 8.94e-04 3.26e-02 3.29e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.614 1.309 - - 1.50e-04 1.74e-04 78.105 57
CPL -2.394 0.000 17.1 11.7 8.74e+00 8.12e+01 74.335 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.614 1.309 - - 1.50e-04 1.74e-04 78.105 57
CPL -2.394 0.000 17.1 11.7 8.74e+00 8.12e+01 74.335 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 16.384 0.000 16.384
T90 16.384 0.000 16.384
T50 16.384 0.000 16.384
Peak 16.384 0.000 16.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
240.3309 -46.9302 0.0464 17.7 -14.0 0.2134 4.2 TRIG_00349441
------------------------------------------
Foreground time interval of the image:
0.000 16.384 (delta_t = 16.384 [sec])
Background time interval of the image:
-60.136 -35.136 (delta_t = 25.000 [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 16.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.61437 ( -0.995197 1.62332 )
Norm@50keV : 1.501550E-04 ( -1.501550E-04 1.971197E-04) )
------------------------------------------------------------
Chi-Squared = 78.10455 using 59 PHA bins.
Reduced chi-squared = 1.370255 for 57 degrees of freedom
Null hypothesis probability = 3.322E-02
Photon flux (15-150 keV) in 16.38 sec: 6.632984E-02 ( -0.0331098 0.0335082 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.07082e-08 ( -2.18467e-08 2.55924e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.39415 ( )
Epeak [keV] : 17.0831 ( -17.5849 5.77275 )
Norm@50keV : 8.73670 ( -25.1190 137.366 )
------------------------------------------------------------
Chi-Squared = 74.33506 using 59 PHA bins.
Reduced chi-squared = 1.327412 for 56 degrees of freedom
Null hypothesis probability = 5.109E-02
Photon flux (15-150 keV) in 16.38 sec: 6.630218E-02 ( -0.0331109 0.03351 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.07405e-08 ( -2.18812e-08 2.55585e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50438 ( -8.49562 0.892246 )
beta : -9.34119 ( -0.658811 19.3412 )
Epeak [keV] : 3.91302 ( -6.15468 5.44625 )
Norm@50keV : 1.484001E-02 ( -399.252 708.104 )
------------------------------------------------------------
Chi-Squared = 76.88978 using 59 PHA bins.
Reduced chi-squared = 1.397996 for 55 degrees of freedom
Null hypothesis probability = 2.727E-02
Photon flux (15-150 keV) in 16.38 sec: 7.117975E-02 ( -0.0325691 0.0325803 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17095e-08 ( -1.77897e-08 1.92223e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.61437 ( -0.995197 1.62332 )
Norm@50keV : 1.501550E-04 ( -1.501550E-04 1.971197E-04) )
------------------------------------------------------------
Chi-Squared = 78.10455 using 59 PHA bins.
Reduced chi-squared = 1.370255 for 57 degrees of freedom
Null hypothesis probability = 3.322E-02
Photon flux (15-150 keV) in 16.38 sec: 6.632984E-02 ( -0.0331098 0.0335082 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.07082e-08 ( -2.18467e-08 2.55924e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.39415 ( )
Epeak [keV] : 17.0831 ( -17.5849 5.77275 )
Norm@50keV : 8.73670 ( -25.1190 137.366 )
------------------------------------------------------------
Chi-Squared = 74.33506 using 59 PHA bins.
Reduced chi-squared = 1.327412 for 56 degrees of freedom
Null hypothesis probability = 5.109E-02
Photon flux (15-150 keV) in 16.38 sec: 6.630218E-02 ( -0.0331109 0.03351 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.07405e-08 ( -2.18812e-08 2.55585e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 16.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50438 ( -8.49562 0.892246 )
beta : -9.34119 ( -0.658811 19.3412 )
Epeak [keV] : 3.91302 ( -6.15468 5.44625 )
Norm@50keV : 1.484001E-02 ( -399.252 708.104 )
------------------------------------------------------------
Chi-Squared = 76.88978 using 59 PHA bins.
Reduced chi-squared = 1.397996 for 55 degrees of freedom
Null hypothesis probability = 2.727E-02
Photon flux (15-150 keV) in 16.38 sec: 7.117975E-02 ( -0.0325691 0.0325803 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17095e-08 ( -1.77897e-08 1.92223e-08 ) ergs/cm2
Plot creation:
Fri Apr 17 14:48:56 EDT 2009