batgrbproduct Analysis for Trigger=154630
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 Jan 8 20:41:22 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger154630/GCN5_download_cron
======================================================================
Trigger: 00154630 Segment: 000
BAT Trigger Time: 148147173.568 [s; MET]
Trigger Stop: 148147174.08 [s; MET]
UTC: 2005-09-11T15:59:33.844660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 13.6918901114025 Dec: -38.8605504101289 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.81
Image Trigger?: NO
Rate S/N Ratio: 18.8414436814168 [ if not an image trigger ]
Image S/N Ratio: 8.81
Flight Position: [ source = BAT ]
RA: 13.6918901114025 Dec: -38.8605504101289 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 13.710772872614 Dec: -38.8602240889795 [deg; J2000]
{ 00h 54m 50.6s , -38d 51' 36.8" }
+/- 2.39021717858509 [arcmin] (estimated 90% radius based on SNR)
+/- 1.03771927946795 [arcmin] (formal 1-sigma fit error)
SNR: 8.75978758574323
RA = 0h 54m 50.6s (13.710773 deg.)
Dec = -38d 51' 37" (-38.860224 deg.)
Angular difference between Flight and Ground position is 0.882432 arcmin
Partial Coding Fraction: 0.4296875 [ including projection effects ]
Duration
T90: 15.7360000014305 +/- 0.867910115130624
Measured from: -0.751999974250793
to: 14.9840000271797 [s; relative to TRIGTIME]
T50: 12.6200000047684 +/- 1.32073464953831
Measured from: 0.188000023365021
to: 12.8080000281334 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.104000002145767
to: 0.895999997854233 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.995999991893768
to: 15.9680000245571 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.204069 0.213120 0.126652 0.006637
0.028660 0.029321 0.025827 0.022951 [error]
Peak 0.062697 0.050853 0.039381 0.009885
0.008141 0.007965 0.007146 0.005826 [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 6.05e-08 9.05e-08 1.01e-07 2.15e-07 3.17e-07 4.70e-07 erg/cm2
Error 1.35e-08 1.36e-08 2.52e-08 1.09e-07 5.81e-08 1.34e-07 erg/cm2
Peak flux Power-law 5.74e-01 4.44e-01 2.30e-01 1.73e-01 1.33e+00 1.42e+00 ph/cm2/s
Error 1.31e-01 6.74e-02 5.93e-02 8.66e-02 2.02e-01 2.18e-01 ph/cm2/s
Fluence Cutoff-PL 5.98e-08 9.16e-08 1.01e-07 1.87e-07 3.15e-07 3.89e-07 erg/cm2
Error 1.41e-08 1.68e-08 2.64e-08 1.38e-07 5.80e-08 1.80e-07 erg/cm2
Peak flux Cutoff-PL 5.73e-01 4.44e-01 2.30e-01 1.71e-01 1.33e+00 1.42e+00 ph/cm2/s
Error 1.31e-01 6.74e-02 5.93e-02 8.60e-02 2.02e-01 2.18e-01 ph/cm2/s
Fluence Band 5.98e-08 9.33e-08 9.71e-08 1.85e-07 3.11e-07 4.31e-07 erg/cm2
Error 1.48e-08 1.82e-08 1.84e-08 1.06e-07 6.11e-08 1.46e-07 erg/cm2
Peak flux Band 5.72e-01 4.44e-01 2.31e-01 1.73e-01 1.33e+00 1.42e+00 ph/cm2/s
Error 1.07e-01 6.74e-02 4.26e-02 1.82e-01 2.01e-01 8.64e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.837 0.284 - - 2.03e-03 3.68e-04 44.843 57
CPL 1.687 0.903 89.1 5000.0 2.47e-03 5.00e+23 44.848 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.946 0.301 - - 9.07e-03 1.74e-03 49.582 57
CPL 1.926 0.844 154.5 0.0 9.32e-03 1.75e-03 49.594 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 16.964 -0.996 15.968
T90 15.736 -0.752 14.984
T50 12.620 0.188 12.808
Peak 1.000 -0.104 0.896
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
13.7108 -38.8602 0.0220 28.3 74.5 0.4934 8.8 TRIG_00154630
------------------------------------------
Foreground time interval of the image:
-0.996 15.968 (delta_t = 16.964 [sec])
Background time interval of the image:
-299.568 -229.048 (delta_t = 70.520 [sec])
-227.568 -221.860 (delta_t = 5.708 [sec])
-220.568 -211.932 (delta_t = 8.636 [sec])
-210.568 -131.888 (delta_t = 78.680 [sec])
-130.568 -130.042 (delta_t = 0.526 [sec])
-128.568 -0.996 (delta_t = 127.572 [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 -0.996 sec. to 15.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83713 ( -0.276558 0.291786 )
Norm@50keV : 2.032959E-03 ( -3.740765E-04 3.615797E-04) )
------------------------------------------------------------
Chi-Squared = 44.84253 using 59 PHA bins.
Reduced chi-squared = 0.7867111 for 57 degrees of freedom
Null hypothesis probability = 0.879
Photon flux (15-150 keV) in 16.96 sec: 0.284272 ( -0.042936 0.042947 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17079e-07 ( -5.72977e-08 5.89326e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.996 sec. to 15.968 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68662 ( -1.14163 0.665202 )
Epeak [keV] : 89.0583 ( -89.0483 9910.94 )
Norm@50keV : 2.470843E-03 ( -2.470843E-03 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 44.84768 using 59 PHA bins.
but latest trial 2.07540 gives Chi-Squared = 0.234001
Reduced chi-squared = 0.8008514 for 56 degrees of freedom
Null hypothesis probability = 0.857
Photon flux (15-150 keV) in 16.96 sec: 0.283650 ( -0.042712 0.042713 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14774e-07 ( -5.49097e-08 6.10628e-08 ) ergs/cm2
Band function
Time interval is from -0.996 sec. to 15.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.785780 ( -9.21422 4.67735 )
beta : -1.97557 ( -8.02443 0.380910 )
Epeak [keV] : 34.1252 ( -34.0252 745.123 )
Norm@50keV : 1.087672E-02 ( -182.583 103.742 )
------------------------------------------------------------
Chi-Squared = 44.21790 using 59 PHA bins.
Reduced chi-squared = 0.8039619 for 55 degrees of freedom
Null hypothesis probability = 0.851
Photon flux (15-150 keV) in 16.96 sec: 0.284787 ( -0.043713 0.043218 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11286e-07 ( -6.15275e-08 6.06778e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.104 sec. to 0.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94610 ( -0.289951 0.312573 )
Norm@50keV : 9.066189E-03 ( -1.781984E-03 1.703008E-03) )
------------------------------------------------------------
Chi-Squared = 49.58171 using 59 PHA bins.
Reduced chi-squared = 0.8698545 for 57 degrees of freedom
Null hypothesis probability = 0.747
Photon flux (15-150 keV) in 1.000 sec: 1.32731 ( -0.20214 0.20221 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.3466e-08 ( -1.53675e-08 1.57178e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.104 sec. to 0.896 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.92592 ( -1.02183 0.665979 )
Epeak [keV] : 154.487 ( )
Norm@50keV : 9.315049E-03 ( -1.789015E-03 1.714682E-03) )
------------------------------------------------------------
Chi-Squared = 49.59398 using 59 PHA bins.
but latest trial 2.59185 gives Chi-Squared = 1.76498
but latest trial 7.85359 gives Chi-Squared = 7.278442E-03
Reduced chi-squared = 0.8856068 for 56 degrees of freedom
Null hypothesis probability = 0.714
Photon flux (15-150 keV) in 1.000 sec: 1.32687 ( -0.20207 0.20215 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33823e-08 ( -1.5288e-08 1.58052e-08 ) ergs/cm2
Band function
Time interval is from -0.104 sec. to 0.896 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44448 ( -8.55552 5.13835 )
beta : -1.97009 ( -8.02991 0.310726 )
Epeak [keV] : 27.3915 ( -27.2915 9972.61 )
Norm@50keV : 2.168079E-02 ( -1.409717E-02 35712.3 )
------------------------------------------------------------
Chi-Squared = 49.51939 using 59 PHA bins.
Reduced chi-squared = 0.9003525 for 55 degrees of freedom
Null hypothesis probability = 0.683
Photon flux (15-150 keV) in 1.000 sec: 1.32725 ( -0.20112 0.20133 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.30368e-08 ( -1.89418e-08 1.26086e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 20:50:45 EST 2008