batgrbproduct Analysis for Trigger=146372
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 v2.41
Process Start Time (local time): Mon Jan 7 16:25:40 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger146372/SDC
======================================================================
Trigger: 00146372 Segment: 000
BAT Trigger Time: 143289051.92 [s; MET]
Trigger Stop: 143289051.984 [s; MET]
UTC: 2005-07-17T10:30:52.293760 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 214.331859623212 Dec: -50.5394150035486 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.53
Image Trigger?: NO
Rate S/N Ratio: 15.556349186104 [ if not an image trigger ]
Image S/N Ratio: 8.53
Flight Position: [ source = BAT ]
RA: 214.331859623212 Dec: -50.5394150035486 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 214.350778262901 Dec: -50.5402995719546 [deg; J2000]
{ 14h 17m 24.2s , -50d 32' 25.1" }
+/- 0.651173101470959 [arcmin] (estimated 90% radius based on SNR)
+/- 0.216987067070267 [arcmin] (formal 1-sigma fit error)
SNR: 56.1392110476842
RA = 14h 17m 24.2s (214.350778 deg.)
Dec = -50d 32' 25" (-50.540300 deg.)
Angular difference between Flight and Ground position is 0.723364 arcmin
Partial Coding Fraction: 0.46875 [ including projection effects ]
Duration
T90: 85.027999997139 +/- 18.5487608288558
Measured from: 2.84800001978874
to: 87.8760000169277 [s; relative to TRIGTIME]
T50: 27.3879999816418 +/- 2.1378540797384
Measured from: 6.92400002479553
to: 34.3120000064373 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.68400001525879
to: 3.68400001525879 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.015999972820282
to: 209.152000010014 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.181544 3.313985 2.868178 0.881278
0.077429 0.075957 0.066528 0.055259 [error]
Peak 0.142711 0.258615 0.269371 0.086893
0.009977 0.011320 0.011750 0.009738 [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 7.18e-07 1.46e-06 2.30e-06 8.09e-06 6.41e-06 1.26e-05 erg/cm2
Error 4.53e-08 5.24e-08 6.94e-08 6.02e-07 1.76e-07 6.18e-07 erg/cm2
Peak flux Power-law 1.47e+00 1.91e+00 1.82e+00 3.07e+00 6.23e+00 8.27e+00 ph/cm2/s
Error 1.54e-01 1.18e-01 9.44e-02 3.62e-01 3.10e-01 4.20e-01 ph/cm2/s
Fluence Cutoff-PL 7.17e-07 1.46e-06 2.31e-06 8.04e-06 6.41e-06 1.25e-05 erg/cm2
Error 4.53e-08 5.25e-08 6.95e-08 5.98e-07 1.76e-07 4.65e-07 erg/cm2
Peak flux Cutoff-PL 1.47e+00 1.91e+00 1.82e+00 3.05e+00 6.23e+00 8.25e+00 ph/cm2/s
Error 1.54e-01 1.18e-01 9.45e-02 3.60e-01 3.10e-01 4.18e-01 ph/cm2/s
Fluence Band 7.05e-07 1.45e-06 2.31e-06 8.15e-06 6.41e-06 1.27e-05 erg/cm2
Error 2.03e-08 4.12e-08 6.70e-08 5.61e-07 1.73e-07 4.16e-07 erg/cm2
Peak flux Band 1.47e+00 1.91e+00 1.82e+00 3.05e+00 6.23e+00 8.09e+00 ph/cm2/s
Error 1.54e-01 1.18e-01 9.45e-02 3.60e-01 3.10e-01 6.34e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.338 0.054 - - 3.13e-03 8.66e-05 47.527 57
CPL 1.281 0.000 723.2 0.0 3.31e-03 8.67e-05 48.490 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.071 0.089 - - 5.38e-02 2.58e-03 44.435 57
CPL 1.066 0.090 9999.1 5000.0 5.41e-02 2.59e-03 44.457 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: 52.928000 sec.
T50 in the 50-300 keV band: 17.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 209.168 -0.016 209.152
T90 85.028 2.848 87.876
T50 27.388 6.924 34.312
Peak 1.000 2.684 3.684
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
214.3508 -50.5403 0.0034 36.0 155.8 4.0898 56.1 TRIG_00146372
------------------------------------------
Foreground time interval of the image:
0.064 12.365 (delta_t = 12.301 [sec])
Background time interval of the image:
-299.840 0.064 (delta_t = 299.904 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.064 sec. to 209.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33809 ( -5.425656E-02 5.388558E-02) )
Norm@50keV : 3.127604E-03 ( -8.667912E-05 8.643628E-05) )
------------------------------------------------------------
Chi-Squared = 47.52689 using 59 PHA bins.
Reduced chi-squared = 0.8338051 for 57 degrees of freedom
Null hypothesis probability = 0.810
Photon flux (15-150 keV) in 209.2 sec: 0.375876 ( -0.012011 0.012074 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.40767e-06 ( -1.76084e-07 1.76209e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.064 sec. to 209.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28094 ( )
Epeak [keV] : 723.245 ( )
Norm@50keV : 3.314390E-03 ( -8.904631E-05 8.436362E-05) )
------------------------------------------------------------
Chi-Squared = 48.49045 using 59 PHA bins.
Reduced chi-squared = 0.8659009 for 56 degrees of freedom
Null hypothesis probability = 0.752
Photon flux (15-150 keV) in 209.2 sec: 0.375658 ( -0.012003 0.012067 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.40936e-06 ( -1.76377e-07 1.76084e-07 ) ergs/cm2
Band function
Time interval is from 0.064 sec. to 209.232 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06757 ( -8.93243 6.06068 )
beta : -1.33809 ( -5.396891E-02 5.425680E-02) )
Epeak [keV] : 35.0384 ( -34.9384 9854.17 )
Norm@50keV : 6.307414E-03 ( -6.307413E-03 216949. )
------------------------------------------------------------
Chi-Squared = 47.52689 using 59 PHA bins.
Reduced chi-squared = 0.8641252 for 55 degrees of freedom
Null hypothesis probability = 0.753
Photon flux (15-150 keV) in 209.2 sec: 0.375484 ( -0.011512 0.010095 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.41215e-06 ( -1.75205e-07 1.70812e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.764 sec. to 3.764 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07127 ( -8.980143E-02 8.886766E-02) )
Norm@50keV : 5.382624E-02 ( -2.581440E-03 2.572749E-03) )
------------------------------------------------------------
Chi-Squared = 44.43528 using 59 PHA bins.
Reduced chi-squared = 0.7795663 for 57 degrees of freedom
Null hypothesis probability = 0.887
Photon flux (15-150 keV) in 1.000 sec: 6.22724 ( -0.30964 0.31051 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68017e-07 ( -2.9106e-08 2.9208e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.764 sec. to 3.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06574 ( -9.050030E-02 8.951378E-02) )
Epeak [keV] : 9999.11 ( -9999.10 0.885742 )
Norm@50keV : 5.412765E-02 ( -2.590150E-03 2.582315E-03) )
------------------------------------------------------------
Chi-Squared = 44.45678 using 59 PHA bins.
Reduced chi-squared = 0.7938710 for 56 degrees of freedom
Null hypothesis probability = 0.867
Photon flux (15-150 keV) in 1.000 sec: 6.22524 ( -0.30958 0.31036 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68237e-07 ( -2.914e-08 2.9215e-08 ) ergs/cm2
Band function
Time interval is from 2.764 sec. to 3.764 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.844433 ( -9.15557 5.84050 )
beta : -1.07134 ( -8.92866 8.989495E-02) )
Epeak [keV] : 65.0795 ( -64.9795 9934.92 )
Norm@50keV : 9.204089E-02 ( -4.265398E-02 2.697221E+06) )
------------------------------------------------------------
Chi-Squared = 44.43526 using 59 PHA bins.
Reduced chi-squared = 0.8079138 for 55 degrees of freedom
Null hypothesis probability = 0.845
Photon flux (15-150 keV) in 1.000 sec: 6.22522 ( -0.30956 0.31037 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67778e-07 ( -2.909e-08 2.9236e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 16:38:53 EST 2008