batgrbproduct Analysis for Trigger=146227
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 16:08:04 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger146227/SDC
======================================================================
Trigger: 00146227 Segment: 000
BAT Trigger Time: 143210163.264 [s; MET]
Trigger Stop: 143210165.312 [s; MET]
UTC: 2005-07-16T12:36:03.639280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 338.597596475194 Dec: 38.6960690450086 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: NO
Rate S/N Ratio: 9.38083151964686 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 338.597596475194 Dec: 38.6960690450086 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 338.595109579785 Dec: 38.6868981084387 [deg; J2000]
{ 22h 34m 22.8s , +38d 41' 12.8" }
+/- 1.03626314860512 [arcmin] (estimated 90% radius based on SNR)
+/- 0.367005045957657 [arcmin] (formal 1-sigma fit error)
SNR: 28.9080170808626
RA = 22h 34m 22.8s (338.595110 deg.)
Dec = 38d 41' 13" (38.686898 deg.)
Angular difference between Flight and Ground position is 0.562446 arcmin
Partial Coding Fraction: 0.2285156 [ including projection effects ]
Duration
T90: 69.080000013113 +/- 5.30937886199865
Measured from: -8.38400000333786
to: 60.6960000097752 [s; relative to TRIGTIME]
T50: 35.4959999918938 +/- 2.03213383905601
Measured from: 5.18400001525879
to: 40.6800000071526 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 12.2199999988079
to: 13.2199999988079 [s; relative to TRIGTIME]
Total Fluence
Measured from: -13.6759999990463
to: 76.3880000114441 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.984949 3.335693 2.909626 0.771590
0.102859 0.103838 0.090196 0.071323 [error]
Peak 0.061043 0.095195 0.076982 0.028740
0.012905 0.013940 0.011812 0.008659 [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 7.54e-07 1.48e-06 2.26e-06 7.52e-06 6.34e-06 1.20e-05 erg/cm2
Error 5.44e-08 6.34e-08 8.97e-08 6.80e-07 2.28e-07 7.20e-07 erg/cm2
Peak flux Power-law 6.84e-01 7.17e-01 5.31e-01 6.36e-01 2.18e+00 2.57e+00 ph/cm2/s
Error 1.89e-01 1.25e-01 9.44e-02 2.29e-01 3.52e-01 3.95e-01 ph/cm2/s
Fluence Cutoff-PL 6.53e-07 1.53e-06 2.40e-06 3.97e-06 6.19e-06 8.57e-06 erg/cm2
Error 6.95e-08 7.05e-08 1.11e-07 1.13e-06 2.43e-07 1.13e-06 erg/cm2
Peak flux Cutoff-PL 6.47e-01 7.43e-01 5.53e-01 4.47e-01 2.16e+00 2.39e+00 ph/cm2/s
Error 2.15e-01 1.48e-01 1.13e-01 3.51e-01 3.54e-01 5.05e-01 ph/cm2/s
Fluence Band 6.47e-07 1.53e-06 2.40e-06 3.97e-06 6.19e-06 8.60e-06 erg/cm2
Error 6.88e-08 7.02e-08 1.11e-07 1.13e-06 2.43e-07 1.13e-06 erg/cm2
Peak flux Band 6.09e-01 7.92e-01 5.33e-01 5.42e-01 2.17e+00 2.48e+00 ph/cm2/s
Error 2.38e-01 1.84e-01 1.02e-01 4.02e-01 3.60e-01 4.20e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.391 0.063 - - 7.27e-03 2.56e-04 53.008 57
CPL 0.821 0.279 118.2 37.8 1.30e-02 3.69e-03 39.148 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.432 0.253 - - 1.77e-02 2.72e-03 43.377 57
CPL 1.114 0.839 144.7 5000.0 2.56e-02 3.73e-02 43.023 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: 64.320000 sec.
T50 in the 50-300 keV band: 35.008000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 90.064 -13.676 76.388
T90 69.080 -8.384 60.696
T50 35.496 5.184 40.680
Peak 1.000 12.220 13.220
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
338.5951 +38.6869 0.0067 39.2 42.7 5.9297 28.9 TRIG_00146227
------------------------------------------
Foreground time interval of the image:
-13.676 33.741 (delta_t = 47.417 [sec])
Background time interval of the image:
-299.264 -13.676 (delta_t = 285.588 [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 -13.676 sec. to 76.388 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39050 ( -6.300151E-02 6.261432E-02) )
Norm@50keV : 7.271928E-03 ( -2.560099E-04 2.558553E-04) )
------------------------------------------------------------
Chi-Squared = 53.00819 using 59 PHA bins.
Reduced chi-squared = 0.9299682 for 57 degrees of freedom
Null hypothesis probability = 0.626
Photon flux (15-150 keV) in 90.06 sec: 0.883696 ( -0.034827 0.034959 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.34003e-06 ( -2.27392e-07 2.28527e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.676 sec. to 76.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.821385 ( -0.287475 0.270122 )
Epeak [keV] : 118.183 ( -21.6502 54.0082 )
Norm@50keV : 1.303899E-02 ( -3.082821E-03 4.303376E-03) )
------------------------------------------------------------
Chi-Squared = 39.14789 using 59 PHA bins.
Reduced chi-squared = 0.6990694 for 56 degrees of freedom
Null hypothesis probability = 0.958
Photon flux (15-150 keV) in 90.06 sec: 0.854726 ( -0.03701 0.037131 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.19036e-06 ( -2.43225e-07 2.42036e-07 ) ergs/cm2
Band function
Time interval is from -13.676 sec. to 76.388 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.822178 ( -0.269286 0.288340 )
beta : -9.04530 ( -0.954699 7.49250 )
Epeak [keV] : 118.262 ( -21.7661 53.9958 )
Norm@50keV : 1.302721E-02 ( -3.071348E-03 4.316390E-03) )
------------------------------------------------------------
Chi-Squared = 39.14782 using 59 PHA bins.
Reduced chi-squared = 0.7117785 for 55 degrees of freedom
Null hypothesis probability = 0.948
Photon flux (15-150 keV) in 90.06 sec: 0.854716 ( -0.037043 0.037191 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18633e-06 ( -2.43738e-07 2.41523e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 12.220 sec. to 13.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43183 ( -0.255146 0.250443 )
Norm@50keV : 1.773629E-02 ( -2.719350E-03 2.716202E-03) )
------------------------------------------------------------
Chi-Squared = 43.37705 using 59 PHA bins.
Reduced chi-squared = 0.7610009 for 57 degrees of freedom
Null hypothesis probability = 0.908
Photon flux (15-150 keV) in 1.000 sec: 2.17607 ( -0.35103 0.35209 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70278e-07 ( -2.7628e-08 2.7828e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.220 sec. to 13.220 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11352 ( -1.12786 0.550105 )
Epeak [keV] : 144.740 ( -144.730 9855.26 )
Norm@50keV : 2.563092E-02 ( -8.980243E-03 6.565289E-02) )
------------------------------------------------------------
Chi-Squared = 43.02314 using 59 PHA bins.
but latest trial 1.403632E-02 gives Chi-Squared = 5.48997
Reduced chi-squared = 0.7682704 for 56 degrees of freedom
Null hypothesis probability = 0.898
Photon flux (15-150 keV) in 1.000 sec: 2.16310 ( -0.3533 0.35416 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68273e-07 ( -1.4652e-08 2.8501e-08 ) ergs/cm2
Band function
Time interval is from 12.220 sec. to 13.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.222654 ( -9.77735 5.08101 )
beta : -1.60018 ( -8.39982 0.364158 )
Epeak [keV] : 52.4497 ( -52.3497 9937.72 )
Norm@50keV : 9.954222E-02 ( -276.982 146.506 )
------------------------------------------------------------
Chi-Squared = 42.15694 using 59 PHA bins.
Reduced chi-squared = 0.7664897 for 55 degrees of freedom
Null hypothesis probability = 0.898
Photon flux (15-150 keV) in 1.000 sec: 2.16672 ( -0.36197 0.35711 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68848e-07 ( -2.8616e-08 2.7253e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 16:24:30 EST 2008