batgrbproduct Analysis for Trigger=349615
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 20 19:48:37 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349615/GCN5_download_cron
======================================================================
Trigger: 00349615 Segment: 000
BAT Trigger Time: 261867620.8 [s; MET]
Trigger Stop: 261867622.848 [s; MET]
UTC: 2009-04-19T21:00:16.127100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 285.615426990333 Dec: 7.74977728401269 [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: 5.91607978309962 [ if not an image trigger ]
Image S/N Ratio: 5.84
Flight Position: [ source = BAT ]
RA: 285.615426990333 Dec: 7.74977728401269 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 285.610303464247 Dec: 7.73954691166504 [deg; J2000]
{ 19h 02m 26.5s , +07d 44' 22.4" }
+/- 3.75942318946591 [arcmin] (estimated 90% radius based on SNR)
+/- 2.37450508755203 [arcmin] (formal 1-sigma fit error)
SNR: 4.58687223105575
Angular difference between Flight and Ground position is 0.685247 arcmin
Partial Coding Fraction: 0.78125 [ including projection effects ]
Duration
T90: 1.72799998521805 +/- 0.572433389445063
Measured from: 8.94069671630859e-08
to: 1.72800007462502 [s; relative to TRIGTIME]
T50: 0.704000025987625 +/- 0.74636181665781
Measured from: 0.384000062942505
to: 1.08800008893013 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0200000107288361
to: 0.979999989271164 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.85599997639656 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.018055 0.033564 0.029543 0.006737
0.008590 0.008846 0.007609 0.007009 [error]
Peak 0.015277 0.017400 0.013672 0.011660
0.006223 0.006347 0.005458 0.005008 [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 5.83e-09 1.30e-08 2.29e-08 9.45e-08 6.26e-08 1.36e-07 erg/cm2
Error 3.17e-09 4.27e-09 7.21e-09 7.12e-08 1.84e-08 7.46e-08 erg/cm2
Peak flux Power-law 1.28e-01 1.43e-01 1.15e-01 1.52e-01 4.42e-01 5.38e-01 ph/cm2/s
Error 8.56e-02 5.81e-02 4.73e-02 1.49e-01 1.57e-01 1.89e-01 ph/cm2/s
Fluence Cutoff-PL 5.54e-09 1.33e-08 2.34e-08 6.95e-08 6.19e-08 1.00e-07 erg/cm2
Error 3.60e-09 4.71e-09 6.21e-09 9.11e-08 1.92e-08 8.97e-08 erg/cm2
Peak flux Cutoff-PL 1.28e-01 1.43e-01 1.15e-01 1.51e-01 4.42e-01 5.37e-01 ph/cm2/s
Error 8.61e-02 5.84e-02 4.73e-02 1.48e-01 1.57e-01 1.78e-01 ph/cm2/s
Fluence Band 5.55e-09 1.32e-08 2.34e-08 7.18e-08 6.19e-08 1.13e-07 erg/cm2
Error 3.60e-09 4.69e-09 8.11e-09 8.65e-08 1.93e-08 8.68e-08 erg/cm2
Peak flux Band 1.34e-01 1.41e-01 1.16e-01 1.60e-01 4.39e-01 5.51e-01 ph/cm2/s
Error 8.30e-02 5.00e-02 7.20e-02 1.42e-01 1.53e-01 7.05e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.184 0.504 - - 3.31e-03 9.06e-04 51.628 57
CPL 0.832 2.488 182.8 5000.0 4.78e-03 2.16e-02 51.612 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.321 0.692 - - 3.69e-03 1.25e-03 55.875 57
CPL 1.317 0.717 9984.4 5000.0 3.71e-03 1.26e-03 55.879 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 1.856 0.000 1.856
T90 1.728 0.000 1.728
T50 0.704 0.384 1.088
Peak 1.000 -0.020 0.980
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
285.6103 +7.7395 0.0420 29.8 1.4 0.0775 4.6 TRIG_00349615
------------------------------------------
Foreground time interval of the image:
0.000 1.856 (delta_t = 1.856 [sec])
Background time interval of the image:
-60.800 0.000 (delta_t = 60.800 [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 1.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18408 ( -0.524224 0.484678 )
Norm@50keV : 3.308633E-03 ( -9.079950E-04 9.041156E-04) )
------------------------------------------------------------
Chi-Squared = 51.62793 using 59 PHA bins.
Reduced chi-squared = 0.9057532 for 57 degrees of freedom
Null hypothesis probability = 0.676
Photon flux (15-150 keV) in 1.856 sec: 0.387516 ( -0.110725 0.111779 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.25899e-08 ( -1.82675e-08 1.85403e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.831594 ( -2.31743 2.65903 )
Epeak [keV] : 182.829 ( -182.819 9817.17 )
Norm@50keV : 4.775623E-03 ( -2.359274E-03 4.089868E-02) )
------------------------------------------------------------
Chi-Squared = 51.61178 using 59 PHA bins.
Reduced chi-squared = 0.9216390 for 56 degrees of freedom
Null hypothesis probability = 0.642
Photon flux (15-150 keV) in 1.856 sec: 0.383878 ( -0.058477 0.114506 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18625e-08 ( -1.94767e-08 1.89394e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.756811 ( -9.24319 5.49948 )
beta : -1.22361 ( -8.77639 0.561471 )
Epeak [keV] : 100.834 ( -100.734 9899.17 )
Norm@50keV : 6.100859E-03 ( -0.188546 698.553 )
------------------------------------------------------------
Chi-Squared = 51.60789 using 59 PHA bins.
Reduced chi-squared = 0.9383253 for 55 degrees of freedom
Null hypothesis probability = 0.605
Photon flux (15-150 keV) in 1.856 sec: 0.383876 ( -0.115617 0.114479 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18649e-08 ( -1.95259e-08 1.9094e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.960 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32054 ( -0.719610 0.664680 )
Norm@50keV : 3.690654E-03 ( -1.252122E-03 1.250687E-03) )
------------------------------------------------------------
Chi-Squared = 55.87489 using 59 PHA bins.
Reduced chi-squared = 0.9802613 for 57 degrees of freedom
Null hypothesis probability = 0.517
Photon flux (15-150 keV) in 0.9600 sec: 0.442008 ( -0.156109 0.157045 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48231e-08 ( -1.29922e-08 1.33308e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.960 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31748 ( -0.766438 0.668189 )
Epeak [keV] : 9984.39 ( -9984.38 15.6104 )
Norm@50keV : 3.705429E-03 ( -1.261327E-03 1.256436E-03) )
------------------------------------------------------------
Chi-Squared = 55.87868 using 59 PHA bins.
but latest trial 0.592720 gives Chi-Squared = 0.834824
Reduced chi-squared = 0.9978335 for 56 degrees of freedom
Null hypothesis probability = 0.479
Photon flux (15-150 keV) in 0.9600 sec: 0.441832 ( -0.156061 0.157 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.47986e-08 ( -1.29709e-08 1.33612e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.960 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00929 ( -8.99071 4.96006 )
beta : -1.31870 ( -8.68130 0.718699 )
Epeak [keV] : 55.4243 ( -55.3243 9944.58 )
Norm@50keV : 6.983990E-03 ( -6.983990E-03 18028.7 )
------------------------------------------------------------
Chi-Squared = 55.87388 using 59 PHA bins.
Reduced chi-squared = 1.015889 for 55 degrees of freedom
Null hypothesis probability = 0.442
Photon flux (15-150 keV) in 0.9600 sec: 0.439191 ( -0.153219 0.153657 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49792e-08 ( -1.31497e-08 1.30852e-08 ) ergs/cm2
Plot creation:
Mon Apr 20 19:57:46 EDT 2009