batgrbproduct Analysis for Trigger=319016
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): Tue Aug 5 13:19:38 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger319016/GCN5_download_cron
======================================================================
Trigger: 00319016 Segment: 000
BAT Trigger Time: 239584817.664 [s; MET]
Trigger Stop: 239584818.688 [s; MET]
UTC: 2008-08-04T23:20:14.670000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.700699569253 Dec: -53.1947513223728 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.49
Image Trigger?: NO
Rate S/N Ratio: 12.8840987267251 [ if not an image trigger ]
Image S/N Ratio: 7.49
Flight Position: [ source = BAT ]
RA: 328.700699569253 Dec: -53.1947513223728 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 328.67461540435 Dec: -53.188949212253 [deg; J2000]
{ 21h 54m 41.9s , -53d 11' 20.2" }
+/- 1.1554928620472 [arcmin] (estimated 90% radius based on SNR)
+/- 0.38296172121783 [arcmin] (formal 1-sigma fit error)
SNR: 24.742914572478
Angular difference between Flight and Ground position is 1.000218 arcmin
Partial Coding Fraction: 0.1972656 [ including projection effects ]
Duration
T90: 33.6319999992847 +/- 15.6348738357631
Measured from: 0.799999982118607
to: 34.4319999814034 [s; relative to TRIGTIME]
T50: 11.1359999477863 +/- 1.62169295287409
Measured from: 4.04800000786781
to: 15.1839999556541 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.57199999690056
to: 2.57199999690056 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.351999998092651
to: 62.7840000092983 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.933300 1.493984 1.781542 0.518348
0.090165 0.087407 0.077803 0.065007 [error]
Peak 0.077170 0.127562 0.107868 0.039882
0.016271 0.016229 0.015787 0.012051 [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 3.38e-07 7.52e-07 1.32e-06 5.41e-06 3.61e-06 7.81e-06 erg/cm2
Error 3.89e-08 5.16e-08 7.48e-08 7.11e-07 1.94e-07 7.38e-07 erg/cm2
Peak flux Power-law 9.48e-01 1.02e+00 7.77e-01 9.66e-01 3.11e+00 3.71e+00 ph/cm2/s
Error 2.40e-01 1.59e-01 1.23e-01 3.16e-01 4.44e-01 5.08e-01 ph/cm2/s
Fluence Cutoff-PL 3.00e-07 7.63e-07 1.38e-06 3.47e-06 3.56e-06 5.79e-06 erg/cm2
Error 5.17e-08 5.47e-08 9.58e-08 1.48e-06 2.02e-07 1.45e-06 erg/cm2
Peak flux Cutoff-PL 8.73e-01 1.05e+00 8.11e-01 6.74e-01 3.06e+00 3.40e+00 ph/cm2/s
Error 2.91e-01 1.34e-01 1.49e-01 4.94e-01 4.56e-01 6.98e-01 ph/cm2/s
Fluence Band 2.97e-07 7.60e-07 1.38e-06 3.47e-06 3.56e-06 6.09e-06 erg/cm2
Error 5.12e-08 5.45e-08 9.59e-08 1.19e-06 2.01e-07 1.50e-06 erg/cm2
Peak flux Band 7.84e-01 1.11e+00 7.90e-01 7.99e-01 3.01e+00 3.47e+00 ph/cm2/s
Error 4.09e-01 2.11e-01 1.00e-01 6.13e-01 4.55e-01 5.99e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.189 0.095 - - 5.61e-03 3.05e-04 39.100 57
CPL 0.779 0.407 181.9 716.7 8.30e-03 3.23e-03 35.868 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.391 0.232 - - 2.56e-02 3.47e-03 47.893 57
CPL 1.019 0.817 143.9 5000.0 3.83e-02 5.55e-02 47.405 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: 28.864000 sec.
T50 in the 50-300 keV band: 10.560000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 63.136 -0.352 62.784
T90 33.632 0.800 34.432
T50 11.136 4.048 15.184
Peak 1.000 1.572 2.572
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
328.6746 -53.1889 0.0078 45.8 158.6 2.8695 24.7 TRIG_00319016
------------------------------------------
Foreground time interval of the image:
-0.352 10.137 (delta_t = 10.489 [sec])
Background time interval of the image:
-239.664 -0.352 (delta_t = 239.312 [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 -0.352 sec. to 62.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18874 ( -9.559953E-02 9.424293E-02) )
Norm@50keV : 5.610341E-03 ( -3.058002E-04 3.043506E-04) )
------------------------------------------------------------
Chi-Squared = 39.09970 using 59 PHA bins.
Reduced chi-squared = 0.6859596 for 57 degrees of freedom
Null hypothesis probability = 0.966
Photon flux (15-150 keV) in 63.14 sec: 0.657514 ( -0.038747 0.038955 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6057e-06 ( -1.9444e-07 1.94484e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.352 sec. to 62.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.779152 ( -0.425721 0.388149 )
Epeak [keV] : 181.876 ( -62.3344 1371.12 )
Norm@50keV : 8.296841E-03 ( -2.494818E-03 3.963795E-03) )
------------------------------------------------------------
Chi-Squared = 35.86783 using 59 PHA bins.
Reduced chi-squared = 0.6404969 for 56 degrees of freedom
Null hypothesis probability = 0.983
Photon flux (15-150 keV) in 63.14 sec: 0.641393 ( -0.041408 0.041501 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55845e-06 ( -2.02111e-07 2.01221e-07 ) ergs/cm2
Band function
Time interval is from -0.352 sec. to 62.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.780220 ( -0.386832 0.426832 )
beta : -6.87053 ( -3.12947 7.53409 )
Epeak [keV] : 182.132 ( -62.6066 1407.57 )
Norm@50keV : 8.291268E-03 ( -2.489982E-03 3.970026E-03) )
------------------------------------------------------------
Chi-Squared = 35.86781 using 59 PHA bins.
Reduced chi-squared = 0.6521420 for 55 degrees of freedom
Null hypothesis probability = 0.979
Photon flux (15-150 keV) in 63.14 sec: 0.641360 ( -0.041388 0.041597 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55616e-06 ( -2.02206e-07 2.0076e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.568 sec. to 2.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39071 ( -0.231305 0.232001 )
Norm@50keV : 2.557895E-02 ( -3.470073E-03 3.468007E-03) )
------------------------------------------------------------
Chi-Squared = 47.89260 using 59 PHA bins.
Reduced chi-squared = 0.8402210 for 57 degrees of freedom
Null hypothesis probability = 0.799
Photon flux (15-150 keV) in 1.008 sec: 3.10856 ( -0.44323 0.44529 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49557e-07 ( -3.61338e-08 3.64987e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.568 sec. to 2.576 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01856 ( -1.05407 0.579990 )
Epeak [keV] : 143.868 ( -143.858 9856.13 )
Norm@50keV : 3.834447E-02 ( -3.234630E-02 7.860537E-02) )
------------------------------------------------------------
Chi-Squared = 47.40461 using 59 PHA bins.
but latest trial 4.351869E-03 gives Chi-Squared = 2.82734
Reduced chi-squared = 0.8465109 for 56 degrees of freedom
Null hypothesis probability = 0.786
Photon flux (15-150 keV) in 1.008 sec: 3.06215 ( -0.45568 0.45662 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45741e-07 ( -3.83272e-08 3.77808e-08 ) ergs/cm2
Band function
Time interval is from 1.568 sec. to 2.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.190351 ( -9.80965 4.46628 )
beta : -1.59681 ( -8.40319 0.384125 )
Epeak [keV] : 62.1745 ( -62.0745 550.142 )
Norm@50keV : 0.119492 ( -0.119492 494.805 )
------------------------------------------------------------
Chi-Squared = 46.79646 using 59 PHA bins.
Reduced chi-squared = 0.8508448 for 55 degrees of freedom
Null hypothesis probability = 0.776
Photon flux (15-150 keV) in 1.008 sec: 3.00542 ( -0.46117 0.44918 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45703e-07 ( -3.84562e-08 3.77738e-08 ) ergs/cm2
Plot creation:
Tue Aug 5 14:00:40 EDT 2008