batgrbproduct Analysis for Trigger=155284
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): Wed Jan 9 11:15:11 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger155284/SDC
======================================================================
Trigger: 00155284 Segment: 000
BAT Trigger Time: 148512184 [s; MET]
Trigger Stop: 148512248 [s; MET]
UTC: 2005-09-15T21:23:04.269060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 219.095807718615 Dec: -67.4048403823788 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 35103
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 35103
Flight Position: [ source = BAT ]
RA: 219.095807718615 Dec: -67.4048403823788 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 219.121243170276 Dec: -67.4055784577299 [deg; J2000]
{ 14h 36m 29.1s , -67d 24' 20.1" }
+/- 0.736938152875687 [arcmin] (estimated 90% radius based on SNR)
+/- 0.259506858628258 [arcmin] (formal 1-sigma fit error)
SNR: 47.0438229102206
RA = 14h 36m 29.1s (219.121243 deg.)
Dec = -67d 24' 20" (-67.405578 deg.)
Angular difference between Flight and Ground position is 0.588025 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 40.8600000143051 +/- 3.11425109620483
Measured from: -4.30799999833107
to: 36.552000015974 [s; relative to TRIGTIME]
T50: 20.9920000135899 +/- 0.959774978080142
Measured from: 2.26399999856949
to: 23.2560000121593 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -3.07600000500679
to: -2.07600000500679 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.38800001144409
to: 48.2840000092983 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.080490 2.464877 1.357483 0.237194
0.055474 0.055897 0.046765 0.037438 [error]
Peak 0.079030 0.106725 0.071350 0.016678
0.008007 0.008186 0.007162 0.005194 [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 7.12e-07 1.02e-06 1.10e-06 2.18e-06 3.51e-06 5.01e-06 erg/cm2
Error 4.29e-08 3.50e-08 4.87e-08 2.15e-07 1.15e-07 2.46e-07 erg/cm2
Peak flux Power-law 8.20e-01 7.74e-01 5.08e-01 5.16e-01 2.31e+00 2.62e+00 ph/cm2/s
Error 1.23e-01 7.12e-02 5.88e-02 1.22e-01 2.07e-01 2.28e-01 ph/cm2/s
Fluence Cutoff-PL 6.44e-07 1.06e-06 1.12e-06 1.18e-06 3.38e-06 3.98e-06 erg/cm2
Error 5.51e-08 4.02e-08 5.28e-08 3.95e-07 1.37e-07 4.22e-07 erg/cm2
Peak flux Cutoff-PL 7.92e-01 7.89e-01 5.16e-01 4.09e-01 2.29e+00 2.50e+00 ph/cm2/s
Error 1.44e-01 6.32e-02 4.91e-02 2.16e-01 2.12e-01 3.04e-01 ph/cm2/s
Fluence Band 6.36e-07 1.06e-06 1.11e-06 1.49e-06 3.37e-06 4.38e-06 erg/cm2
Error 5.67e-08 4.16e-08 5.96e-08 5.91e-07 1.36e-07 5.83e-07 erg/cm2
Peak flux Band 7.82e-01 7.99e-01 5.10e-01 4.58e-01 2.29e+00 2.54e+00 ph/cm2/s
Error 1.50e-01 9.40e-02 6.55e-02 1.66e-01 2.14e-01 3.20e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.902 0.064 - - 6.74e-03 2.22e-04 55.486 57
CPL 1.427 0.278 60.8 12.6 1.15e-02 3.63e-03 45.980 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.608 0.157 - - 1.79e-02 1.63e-03 40.783 57
CPL 1.416 0.627 150.4 5000.0 2.25e-02 1.67e-02 40.470 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: 35.520000 sec.
T50 in the 50-300 keV band: 19.200000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 56.672 -8.388 48.284
T90 40.860 -4.308 36.552
T50 20.992 2.264 23.256
Peak 1.000 -3.076 -2.076
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
219.1212 -67.4056 0.0041 24.5 88.3 5.9752 47.0 TRIG_00155284
------------------------------------------
Foreground time interval of the image:
-4.499 48.284 (delta_t = 52.783 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -8.388 sec. to 48.284 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90236 ( -6.329048E-02 6.371510E-02) )
Norm@50keV : 6.735690E-03 ( -2.218736E-04 2.212883E-04) )
------------------------------------------------------------
Chi-Squared = 55.48602 using 59 PHA bins.
Reduced chi-squared = 0.9734389 for 57 degrees of freedom
Null hypothesis probability = 0.532
Photon flux (15-150 keV) in 56.67 sec: 0.967612 ( -0.035217 0.035428 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50944e-06 ( -1.14819e-07 1.14938e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.388 sec. to 48.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42722 ( -0.287473 0.268855 )
Epeak [keV] : 60.7720 ( -7.99078 17.1343 )
Norm@50keV : 1.150394E-02 ( -2.947181E-03 4.305527E-03) )
------------------------------------------------------------
Chi-Squared = 45.98014 using 59 PHA bins.
Reduced chi-squared = 0.8210739 for 56 degrees of freedom
Null hypothesis probability = 0.828
Photon flux (15-150 keV) in 56.67 sec: 0.929710 ( -0.040408 0.040599 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3782e-06 ( -1.38337e-07 1.35594e-07 ) ergs/cm2
Band function
Time interval is from -8.388 sec. to 48.284 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38939 ( -0.299326 0.700552 )
beta : -2.36291 ( -7.63709 0.365488 )
Epeak [keV] : 58.9341 ( -18.5309 18.0776 )
Norm@50keV : 1.208893E-02 ( -3.464878E-03 2.199027E-02) )
------------------------------------------------------------
Chi-Squared = 45.83078 using 59 PHA bins.
Reduced chi-squared = 0.8332869 for 55 degrees of freedom
Null hypothesis probability = 0.806
Photon flux (15-150 keV) in 56.67 sec: 0.927862 ( -0.041297 0.041042 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37122e-06 ( -1.37629e-07 1.34676e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -3.076 sec. to -2.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60847 ( -0.155354 0.157781 )
Norm@50keV : 1.794942E-02 ( -1.634639E-03 1.621343E-03) )
------------------------------------------------------------
Chi-Squared = 40.78316 using 59 PHA bins.
Reduced chi-squared = 0.7154940 for 57 degrees of freedom
Null hypothesis probability = 0.948
Photon flux (15-150 keV) in 1.000 sec: 2.31271 ( -0.20637 0.2067 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67822e-07 ( -1.6448e-08 1.6316e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.076 sec. to -2.076 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41585 ( -0.660416 0.592729 )
Epeak [keV] : 150.411 ( -150.401 9849.59 )
Norm@50keV : 2.253866E-02 ( -7.672539E-03 2.580878E-02) )
------------------------------------------------------------
Chi-Squared = 40.47006 using 59 PHA bins.
but latest trial 1.338052E-02 gives Chi-Squared = 21.0356
Reduced chi-squared = 0.7226796 for 56 degrees of freedom
Null hypothesis probability = 0.941
Photon flux (15-150 keV) in 1.000 sec: 2.29446 ( -0.21394 0.21082 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65487e-07 ( -1.7874e-08 1.7395e-08 ) ergs/cm2
Band function
Time interval is from -3.076 sec. to -2.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22323 ( -8.77677 3.09699 )
beta : -1.74908 ( -8.25092 0.282622 )
Epeak [keV] : 86.0344 ( -85.9344 9913.97 )
Norm@50keV : 2.940393E-02 ( -1.292064E-02 41626.3 )
------------------------------------------------------------
Chi-Squared = 40.34288 using 59 PHA bins.
Reduced chi-squared = 0.7335069 for 55 degrees of freedom
Null hypothesis probability = 0.931
Photon flux (15-150 keV) in 1.000 sec: 2.28739 ( -0.21369 0.21366 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65007e-07 ( -1.7501e-08 1.7439e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 11:33:48 EST 2008