batgrbproduct Analysis for Trigger=334129
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): Sun Nov 9 23:52:28 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger334129/GCN5_download_cron
======================================================================
Trigger: 00334129 Segment: 000
BAT Trigger Time: 247931240 [s; MET]
Trigger Stop: 247931368 [s; MET]
UTC: 2008-11-09T13:47:16.758200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 350.157415273707 Dec: -55.9037523400265 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.09
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.09
Flight Position: [ source = BAT ]
RA: 350.157415273707 Dec: -55.9037523400265 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 350.132442770939 Dec: -55.9118992237318 [deg; J2000]
{ 23h 20m 31.8s , -55d 54' 42.8" }
+/- 3.44428042293335 [arcmin] (estimated 90% radius based on SNR)
+/- 1.93165462256166 [arcmin] (formal 1-sigma fit error)
SNR: 5.19798239226301
Angular difference between Flight and Ground position is 0.971756 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 128 +/-
Measured from: 0
to: 128 [s; relative to TRIGTIME]
T50: 128 +/-
Measured from: 0
to: 128 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 128 second)
Measured from: 0
to: 128 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 128 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.253282 0.200537 0.059368 -0.032433
0.053596 0.054552 0.051762 0.052893 [error]
Peak 0.253282 0.200537 0.059368 -0.032433
0.053596 0.054552 0.051762 0.052893 [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 6.24e-08 7.46e-08 6.44e-08 9.47e-08 2.35e-07 2.98e-07 erg/cm2
Error 2.07e-08 2.43e-08 3.79e-08 1.08e-07 9.15e-08 1.63e-07 erg/cm2
Peak flux Power-law 1.60e-02 1.06e-02 4.56e-03 2.71e-03 3.25e-02 3.38e-02 ph/cm2/s
Error 5.39e-03 3.35e-03 2.61e-03 3.25e-03 9.48e-03 1.03e-02 ph/cm2/s
Fluence Cutoff-PL 6.82e-13 6.82e-13 6.82e-13 6.82e-13 6.82e-13 6.82e-13 erg/cm2
Error 6.40e+13 6.40e+13 6.40e+13 6.40e+13 6.40e+13 6.40e+13 erg/cm2
Peak flux Cutoff-PL 5.33e-03 5.33e-03 5.33e-03 5.33e-03 5.33e-03 5.33e-03 ph/cm2/s
Error 5.00e+23 5.00e+23 5.00e+23 5.00e+23 5.00e+23 5.00e+23 ph/cm2/s
Fluence Band 5.95e-08 9.35e-08 4.95e-08 5.72e-09 2.03e-07 2.10e-07 erg/cm2
Error 2.21e-08 2.47e-08 1.80e-08 3.78e-08 5.24e-08 0.00e+00 erg/cm2
Peak flux Band 1.48e-02 1.36e-02 3.41e-03 1.46e-04 3.18e-02 3.09e-02 ph/cm2/s
Error 5.71e-03 3.89e-03 2.06e-03 1.92e-03 8.84e-03 9.98e-03 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.213 0.564 - - 1.95e-04 8.65e-05 68.772 57
CPL -0.042 2.499 32.3 22.5 5.33e-03 1.44e-01 66.055 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.213 0.564 - - 1.95e-04 8.65e-05 68.772 57
CPL -0.042 2.499 32.3 22.5 5.33e-03 1.44e-01 66.055 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 128.000 0.000 128.000
T90 128.000 0.000 128.000
T50 128.000 0.000 128.000
Peak 128.000 0.000 128.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
350.1324 -55.9119 0.0369 11.1 127.0 0.6124 5.2 TRIG_00334129
------------------------------------------
Foreground time interval of the image:
0.000 128.000 (delta_t = 128.000 [sec])
Background time interval of the image:
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 128.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21267 ( -0.503787 0.623984 )
Norm@50keV : 1.947600E-04 ( -8.596753E-05 8.705835E-05) )
------------------------------------------------------------
Chi-Squared = 68.77232 using 59 PHA bins.
Reduced chi-squared = 1.206532 for 57 degrees of freedom
Null hypothesis probability = 0.137
Photon flux (15-150 keV) in 128.0 sec: 3.245615E-02 ( -0.00944648 0.00950963 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34798e-07 ( -8.58957e-08 9.70086e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 128.000 sec.
Parameters : value lower 90% higher 90%
Photon index: -4.175554E-02 ( -2.95824 2.03933 )
Epeak [keV] : 32.3054 ( -32.2954 12.7290 )
Norm@50keV : 5.329750E-03 ( -5.329750E-03 0.282950 )
------------------------------------------------------------
Chi-Squared = 66.05534 using 59 PHA bins.
but latest trial 1.99789 gives Chi-Squared = 3.15088
but latest trial 56.3294 gives Chi-Squared = 3.22919
Reduced chi-squared = 1.179560 for 56 degrees of freedom
Null hypothesis probability = 0.168
Photon flux (15-150 keV) in 128.0 sec: 5.328210E-03 ( -0.00532821 1e+24 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.82011e-13 ( -6.82011e-13 1.28e+14 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 128.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25655 ( -8.74345 5.66227 )
beta : -9.30164 ( -0.698363 7.36970 )
Epeak [keV] : 28.2199 ( -28.1199 9971.78 )
Norm@50keV : 8.031031E-04 ( -8.910715E-03 75.2355 )
------------------------------------------------------------
Chi-Squared = 66.78181 using 59 PHA bins.
Reduced chi-squared = 1.214215 for 55 degrees of freedom
Null hypothesis probability = 0.133
Photon flux (15-150 keV) in 128.0 sec: 3.181911E-02 ( -0.00893349 0.00875549 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02664e-07 ( -3.86138e-08 6.61222e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 128.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21267 ( -0.503787 0.623984 )
Norm@50keV : 1.947600E-04 ( -8.596753E-05 8.705835E-05) )
------------------------------------------------------------
Chi-Squared = 68.77232 using 59 PHA bins.
Reduced chi-squared = 1.206532 for 57 degrees of freedom
Null hypothesis probability = 0.137
Photon flux (15-150 keV) in 128.0 sec: 3.245615E-02 ( -0.00944648 0.00950963 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34798e-07 ( -8.58957e-08 9.70086e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 128.000 sec.
Parameters : value lower 90% higher 90%
Photon index: -4.175554E-02 ( -2.95824 2.03933 )
Epeak [keV] : 32.3054 ( -32.2954 12.7290 )
Norm@50keV : 5.329750E-03 ( -5.329750E-03 0.282950 )
------------------------------------------------------------
Chi-Squared = 66.05534 using 59 PHA bins.
but latest trial 1.99789 gives Chi-Squared = 3.15088
but latest trial 56.3294 gives Chi-Squared = 3.22919
Reduced chi-squared = 1.179560 for 56 degrees of freedom
Null hypothesis probability = 0.168
Photon flux (15-150 keV) in 128.0 sec: 5.328210E-03 ( -0.00532821 1e+24 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.82011e-13 ( -6.82011e-13 1.28e+14 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 128.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25655 ( -8.74345 5.66227 )
beta : -9.30164 ( -0.698363 7.36970 )
Epeak [keV] : 28.2199 ( -28.1199 9971.78 )
Norm@50keV : 8.031031E-04 ( -8.910715E-03 75.2355 )
------------------------------------------------------------
Chi-Squared = 66.78181 using 59 PHA bins.
Reduced chi-squared = 1.214215 for 55 degrees of freedom
Null hypothesis probability = 0.133
Photon flux (15-150 keV) in 128.0 sec: 3.181911E-02 ( -0.00893349 0.00875549 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02664e-07 ( -3.86138e-08 6.61222e-08 ) ergs/cm2
Plot creation:
Mon Nov 10 00:09:39 EST 2008