batgrbproduct Analysis for Trigger=337889
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 v2.42
Process Start Time (local time): Mon Dec 22 04:00:02 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger337889/GCN5_download_cron
======================================================================
Trigger: 00337889 Segment: 000
BAT Trigger Time: 251569275.2 [s; MET]
Trigger Stop: 251569275.712 [s; MET]
UTC: 2008-12-21T16:21:11.847580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 15.8049817084335 Dec: -24.5258354741473 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.37
Image Trigger?: NO
Rate S/N Ratio: 12.8452325786651 [ if not an image trigger ]
Image S/N Ratio: 8.37
Flight Position: [ source = BAT ]
RA: 15.8049817084335 Dec: -24.5258354741473 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 15.8009824543681 Dec: -24.5424389421762 [deg; J2000]
{ 01h 03m 12.2s , -24d 32' 32.8" }
+/- 0.71058906227833 [arcmin] (estimated 90% radius based on SNR)
+/- 0.16181809342373 [arcmin] (formal 1-sigma fit error)
SNR: 49.5555071682021
Angular difference between Flight and Ground position is 1.019844 arcmin
Partial Coding Fraction: 0.6171875 [ including projection effects ]
Duration
T90: 33.4840000271797 +/- 0.801917699762502
Measured from: 4.60400009155273
to: 38.0880001187325 [s; relative to TRIGTIME]
T50: 9.06800001859665 +/- 0.135882302790745
Measured from: 19.9120000898838
to: 28.9800001084805 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 21.4240000247955
to: 22.4240000247955 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.283999979496002
to: 112.572000026703 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.975714 12.585798 7.876630 1.175833
0.072892 0.077765 0.069809 0.058963 [error]
Peak 0.485867 0.826024 0.681741 0.157127
0.012406 0.015401 0.014842 0.009038 [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 3.67e-06 5.44e-06 6.01e-06 1.25e-05 1.89e-05 2.78e-05 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Power-law 5.47e+00 5.93e+00 4.58e+00 5.79e+00 1.82e+01 2.18e+01 ph/cm2/s
Error 2.58e-01 1.71e-01 1.26e-01 3.34e-01 4.73e-01 5.29e-01 ph/cm2/s
Fluence Cutoff-PL 3.05e-06 5.53e-06 6.35e-06 6.60e-06 1.82e-05 2.15e-05 erg/cm2
Error 1.50e-07 1.03e-07 1.19e-07 7.36e-07 3.04e-07 8.10e-07 erg/cm2
Peak flux Cutoff-PL 4.66e+00 6.12e+00 4.91e+00 3.39e+00 1.76e+01 1.91e+01 ph/cm2/s
Error 3.29e-01 1.88e-01 1.61e-01 5.09e-01 4.96e-01 7.33e-01 ph/cm2/s
Fluence Band 3.02e-06 5.51e-06 6.33e-06 7.73e-06 1.81e-05 2.27e-05 erg/cm2
Error 1.53e-07 1.04e-07 1.17e-07 1.49e-06 3.12e-07 1.76e-06 erg/cm2
Peak flux Band 4.31e+00 6.31e+00 4.78e+00 4.57e+00 1.73e+01 2.00e+01 ph/cm2/s
Error 4.09e-01 2.27e-01 1.65e-01 4.63e-01 5.10e-01 6.70e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.856 0.000 - - 1.85e-02 0.00e+00 119.896 57
CPL 1.211 0.128 69.9 3.9 3.52e-02 4.43e-03 37.728 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.374 0.042 - - 1.50e-01 3.63e-03 106.852 57
CPL 0.749 0.190 112.9 19.3 2.87e-01 5.61e-02 71.265 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: 29.504000 sec.
T50 in the 50-300 keV band: 7.296000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 112.856 -0.284 112.572
T90 33.484 4.604 38.088
T50 9.068 19.912 28.980
Peak 1.000 21.424 22.424
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
15.8010 -24.5424 0.0039 27.1 37.5 2.5547 49.6 TRIG_00337889
------------------------------------------
Foreground time interval of the image:
-0.284 7.901 (delta_t = 8.185 [sec])
Background time interval of the image:
-239.200 -0.284 (delta_t = 238.916 [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
Multiple GTIs in the spectrum
tstart tstop
-0.284000 105.450000
106.800000 112.572000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85556 ( )
Norm@50keV : 1.845715E-02 ( )
------------------------------------------------------------
Chi-Squared = 119.8963 using 59 PHA bins.
Reduced chi-squared = 2.103444 for 57 degrees of freedom
Null hypothesis probability = 2.246E-06
Photon flux (15-150 keV) in 111.5 sec: 2.60024 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89203e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-0.284000 105.450000
106.800000 112.572000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21106 ( -0.129802 0.126681 )
Epeak [keV] : 69.9263 ( -3.44485 4.39536 )
Norm@50keV : 3.518464E-02 ( -4.102701E-03 4.761651E-03) )
------------------------------------------------------------
Chi-Squared = 37.72836 using 59 PHA bins.
Reduced chi-squared = 0.6737208 for 56 degrees of freedom
Null hypothesis probability = 0.971
Photon flux (15-150 keV) in 111.5 sec: 2.42377 ( -0.05669 0.05702 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81588e-05 ( -3.03168e-07 3.04953e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-0.284000 105.450000
106.800000 112.572000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20079 ( -0.134828 0.200371 )
beta : -2.66804 ( -7.33196 0.461948 )
Epeak [keV] : 69.4969 ( -7.65054 4.72260 )
Norm@50keV : 3.560728E-02 ( -5.173203E-03 9.844594E-03) )
------------------------------------------------------------
Chi-Squared = 37.63891 using 59 PHA bins.
Reduced chi-squared = 0.6843438 for 55 degrees of freedom
Null hypothesis probability = 0.964
Photon flux (15-150 keV) in 111.5 sec: 2.42133 ( -0.05786 0.05845 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81218e-05 ( -3.06402e-07 3.17887e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 21.424 sec. to 22.424 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37378 ( -4.177260E-02 4.179788E-02) )
Norm@50keV : 0.149948 ( -3.630847E-03 3.631100E-03) )
------------------------------------------------------------
Chi-Squared = 106.8515 using 59 PHA bins.
Reduced chi-squared = 1.874588 for 57 degrees of freedom
Null hypothesis probability = 7.091E-05
Photon flux (15-150 keV) in 1.000 sec: 18.1552 ( -0.4728 0.4734 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45688e-06 ( -3.7262e-08 3.7332e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.424 sec. to 22.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.749295 ( -0.193363 0.186567 )
Epeak [keV] : 112.863 ( -14.2348 24.4260 )
Norm@50keV : 0.287360 ( -4.968825E-02 6.244338E-02) )
------------------------------------------------------------
Chi-Squared = 71.26511 using 59 PHA bins.
Reduced chi-squared = 1.272591 for 56 degrees of freedom
Null hypothesis probability = 8.217E-02
Photon flux (15-150 keV) in 1.000 sec: 17.5689 ( -0.4943 0.4978 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41917e-06 ( -3.9759e-08 3.9588e-08 ) ergs/cm2
Band function
Time interval is from 21.424 sec. to 22.424 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.129339 ( -0.421764 0.663726 )
beta : -1.67592 ( -0.139983 0.108726 )
Epeak [keV] : 70.1421 ( -14.3995 19.3748 )
Norm@50keV : 0.645253 ( -0.268289 0.954286 )
------------------------------------------------------------
Chi-Squared = 63.38693 using 59 PHA bins.
Reduced chi-squared = 1.152490 for 55 degrees of freedom
Null hypothesis probability = 0.205
Photon flux (15-150 keV) in 1.000 sec: 17.3196 ( -0.529 0.4911 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41815e-06 ( -3.9679e-08 3.9598e-08 ) ergs/cm2
Plot creation:
Mon Dec 22 04:22:02 EST 2008