batgrbproduct Analysis for Trigger=351902
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 May 13 20:46:16 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351902/GCN5_download_cron
======================================================================
Trigger: 00351902 Segment: 000
BAT Trigger Time: 263919162.092 [s; MET]
Trigger Stop: 263919162.156 [s; MET]
UTC: 2009-05-13T14:52:37.353960 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 184.520925508117 Dec: -40.9329101792524 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.66
Image Trigger?: NO
Rate S/N Ratio: 6 [ if not an image trigger ]
Image S/N Ratio: 5.66
Flight Position: [ source = BAT ]
RA: 184.520925508117 Dec: -40.9329101792524 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 184.455950423418 Dec: -40.9806832548544 [deg; J2000]
{ 12h 17m 49.4s , -40d 58' 50.5" }
+/- 4.14049861101339 [arcmin] (estimated 90% radius based on SNR)
+/- 2.44887236059373 [arcmin] (formal 1-sigma fit error)
SNR: 3.99589993258437
Angular difference between Flight and Ground position is 4.109048 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 0.0639999806880951 +/-
Measured from: 0
to: 0.0639999806880951 [s; relative to TRIGTIME]
T50: 0.0639999806880951 +/-
Measured from: 0
to: 0.0639999806880951 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0639999806880951 second)
Measured from: 1.49011611938477e-08
to: 0.0639999955892563 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0639999806880951 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001001 0.007325 0.005667 -0.001362
0.001863 0.001948 0.001870 0.001411 [error]
Peak 0.001001 0.007325 0.005667 -0.001362
0.001863 0.001948 0.001870 0.001411 [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 1.01e-09 1.70e-09 2.18e-09 5.60e-09 6.44e-09 1.05e-08 erg/cm2
Error 6.28e-10 8.28e-10 1.26e-09 6.60e-09 3.33e-09 9.58e-09 erg/cm2
Peak flux Power-law 5.10e-01 4.72e-01 3.02e-01 2.98e-01 1.41e+00 1.58e+00 ph/cm2/s
Error 3.21e-01 2.30e-01 1.72e-01 3.30e-01 6.86e-01 7.71e-01 ph/cm2/s
Fluence Cutoff-PL 5.37e-10 2.71e-09 3.11e-09 3.91e-10 6.72e-09 6.82e-09 erg/cm2
Error 4.86e-10 1.14e-09 1.87e-09 9.34e-10 2.78e-09 2.86e-09 erg/cm2
Peak flux Cutoff-PL 2.62e-01 7.22e-01 4.55e-01 3.22e-02 1.47e+00 1.47e+00 ph/cm2/s
Error 2.44e-01 3.15e-01 2.59e-01 7.09e-02 5.77e-01 5.76e-01 ph/cm2/s
Fluence Band 4.26e-10 2.70e-09 3.08e-09 2.93e-10 6.56e-09 6.35e-09 erg/cm2
Error 5.05e-10 1.21e-09 2.65e-09 4.51e-10 2.41e-09 3.09e-09 erg/cm2
Peak flux Band 1.58e-01 6.80e-01 4.67e-01 2.07e-02 1.34e+00 1.34e+00 ph/cm2/s
Error 2.61e-01 3.86e-01 2.58e-01 6.22e-02 6.15e-01 6.17e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.698 0.613 - - 1.07e-02 5.39e-03 62.173 57
CPL -2.499 0.000 54.6 15.7 1.36e+00 4.36e+00 53.708 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.698 0.613 - - 1.07e-02 5.39e-03 62.173 57
CPL -2.499 0.000 54.6 15.7 1.36e+00 4.36e+00 53.708 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 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
184.4560 -40.9807 0.0483 29.1 15.7 0.0141 4.0 TRIG_00351902
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-2.891 -2.092 (delta_t = 0.799 [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: 1.69768 ( -0.639997 0.585905 )
Norm@50keV : 1.071313E-02 ( -5.345299E-03 5.444626E-03) )
------------------------------------------------------------
Chi-Squared = 62.17301 using 59 PHA bins.
Reduced chi-squared = 1.090755 for 57 degrees of freedom
Null hypothesis probability = 0.297
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.40729 ( -0.685395 0.68708 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.4359e-09 ( -3.25978e-09 3.39219e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49851 ( )
Epeak [keV] : 54.6371 ( -14.6422 16.6647 )
Norm@50keV : 1.36237 ( -2.16399 6.54605 )
------------------------------------------------------------
Chi-Squared = 53.70792 using 59 PHA bins.
Reduced chi-squared = 0.9590699 for 56 degrees of freedom
Null hypothesis probability = 0.562
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.46943 ( -0.545846 0.60786 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.72339e-09 ( -2.63788e-09 2.92602e-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 : 2.62737 ( -12.6274 2.37263 )
beta : -9.37038 ( -8.487701E-05 7.28898 )
Epeak [keV] : 56.8643 ( -55.7276 16.1603 )
Norm@50keV : 1.31794 ( -1.40665 12.5973 )
------------------------------------------------------------
Chi-Squared = 53.75513 using 59 PHA bins.
Reduced chi-squared = 0.9773660 for 55 degrees of freedom
Null hypothesis probability = 0.522
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.34496 ( -0.500349 0.73054 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.5568e-09 ( -2.4125e-09 2.41491e-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: 1.69768 ( -0.639997 0.585905 )
Norm@50keV : 1.071313E-02 ( -5.345299E-03 5.444626E-03) )
------------------------------------------------------------
Chi-Squared = 62.17301 using 59 PHA bins.
Reduced chi-squared = 1.090755 for 57 degrees of freedom
Null hypothesis probability = 0.297
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.40729 ( -0.685395 0.68708 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.4359e-09 ( -3.25978e-09 3.39219e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49851 ( )
Epeak [keV] : 54.6371 ( -14.6422 16.6647 )
Norm@50keV : 1.36237 ( -2.16399 6.54605 )
------------------------------------------------------------
Chi-Squared = 53.70792 using 59 PHA bins.
Reduced chi-squared = 0.9590699 for 56 degrees of freedom
Null hypothesis probability = 0.562
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.46943 ( -0.545846 0.60786 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.72339e-09 ( -2.63788e-09 2.92602e-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 : 2.62737 ( -12.6274 2.37263 )
beta : -9.37038 ( -8.487701E-05 0.629683 )
Epeak [keV] : 56.8643 ( -55.7276 16.1603 )
Norm@50keV : 1.31794 ( -1.40665 12.5973 )
------------------------------------------------------------
Chi-Squared = 53.75513 using 59 PHA bins.
Reduced chi-squared = 0.9773660 for 55 degrees of freedom
Null hypothesis probability = 0.522
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.34496 ( -0.500349 0.73054 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.5568e-09 ( -2.4125e-09 2.41491e-09 ) ergs/cm2
Plot creation:
Wed May 13 20:57:41 EDT 2009