batgrbproduct Analysis for Trigger=142616
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): Thu Jan 10 18:38:14 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger142616/SDC
======================================================================
Trigger: 00142616 Segment: 000
BAT Trigger Time: 141318152.384 [s; MET]
Trigger Stop: 141318179.264 [s; MET]
UTC: 2005-06-24T15:02:32.795660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 130.23404631751 Dec: -42.5823506561924 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.07
Image Trigger?: NO
Rate S/N Ratio: 14.3874945699382 [ if not an image trigger ]
Image S/N Ratio: 16.07
Flight Position: [ source = BAT ]
RA: 130.23404631751 Dec: -42.5823506561924 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 130.19948232507 Dec: -42.5550164468151 [deg; J2000]
{ 08h 40m 47.9s , -42d 33' 18.1" }
+/- 7.54737321314334 [arcmin] (estimated 90% radius based on SNR)
+/- 6.44268020735612 [arcmin] (formal 1-sigma fit error)
SNR: 1.69482297500629
RA = 8h 40m 47.9s (130.199482 deg.)
Dec = -42d 33' 18" (-42.555016 deg.)
Angular difference between Flight and Ground position is 2.241085 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 6 +/- 2.23606797749979
Measured from: -1.38400000333786
to: 4.61599999666214 [s; relative to TRIGTIME]
T50: 3 +/- 1.4142135623731
Measured from: 0.61599999666214
to: 3.61599999666214 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.61599999666214
to: 2.61599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.38400000333786
to: 5.61599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.103349 0.086850 0.007326 0.003996
0.011165 0.012344 0.011841 0.010915 [error]
Peak 0.021296 0.013745 0.005427 -0.001503
0.004251 0.004685 0.004457 0.004038 [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 3.67e-08 3.31e-08 2.06e-08 1.95e-08 9.85e-08 1.10e-07 erg/cm2
Error 6.38e-09 6.77e-09 8.67e-09 1.52e-08 2.09e-08 2.95e-08 erg/cm2
Peak flux Power-law 2.41e-01 1.15e-01 3.32e-02 1.21e-02 3.95e-01 4.01e-01 ph/cm2/s
Error 7.46e-02 4.78e-02 2.88e-02 2.13e-02 1.16e-01 1.21e-01 ph/cm2/s
Fluence Cutoff-PL 3.63e-08 3.77e-08 6.79e-09 8.78e-11 8.09e-08 8.11e-08 erg/cm2
Error 7.00e-09 9.03e-09 1.04e-08 4.34e-09 1.75e-08 1.82e-08 erg/cm2
Peak flux Cutoff-PL 2.41e-01 1.15e-01 3.31e-02 1.20e-02 3.95e-01 4.00e-01 ph/cm2/s
Error 7.45e-02 4.78e-02 2.88e-02 2.11e-02 1.16e-01 1.21e-01 ph/cm2/s
Fluence Band 3.64e-08 3.59e-08 8.85e-09 2.29e-09 8.29e-08 1.10e-07 erg/cm2
Error 7.06e-09 7.49e-09 7.52e-09 4.31e-09 1.73e-08 0.00e+00 erg/cm2
Peak flux Band 2.40e-01 1.15e-01 3.32e-02 1.21e-02 3.96e-01 4.03e-01 ph/cm2/s
Error 7.49e-02 5.08e-02 2.37e-02 1.81e-02 1.13e-01 1.44e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.687 0.380 - - 1.33e-03 4.17e-04 44.780 57
CPL 0.257 2.502 21.1 13.1 6.71e-02 0.00e+00 41.242 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.788 0.842 - - 1.67e-03 1.43e-03 33.176 57
CPL 1.791 3.124 6.0 0.0 8.62e-03 1.42e-03 33.539 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 7.000 -1.384 5.616
T90 6.000 -1.384 4.616
T50 3.000 0.616 3.616
Peak 1.000 1.616 2.616
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
130.1995 -42.5550 0.1121 31.9 -148.5 0.0561 1.7 TRIG_00142616
------------------------------------------
Foreground time interval of the image:
-1.384 5.616 (delta_t = 7.000 [sec])
Background time interval of the image:
-10.384 -1.384 (delta_t = 9.000 [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 -1.384 sec. to 5.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.68672 ( -0.352971 0.407438 )
Norm@50keV : 1.330046E-03 ( -4.080330E-04 4.255592E-04) )
------------------------------------------------------------
Chi-Squared = 44.77979 using 59 PHA bins.
Reduced chi-squared = 0.7856103 for 57 degrees of freedom
Null hypothesis probability = 0.880
Photon flux (15-150 keV) in 7.000 sec: 0.293992 ( -0.045475 0.045593 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85299e-08 ( -2.00179e-08 2.17126e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.384 sec. to 5.616 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.257088 ( -3.25709 1.74772 )
Epeak [keV] : 21.0974 ( -19.2575 6.85684 )
Norm@50keV : 6.705092E-02 ( )
------------------------------------------------------------
Chi-Squared = 41.24163 using 59 PHA bins.
but latest trial 2.00480 gives Chi-Squared = 14.6403
but latest trial 1.84049 gives Chi-Squared = 1.76115
Reduced chi-squared = 0.7364578 for 56 degrees of freedom
Null hypothesis probability = 0.930
Photon flux (15-150 keV) in 7.000 sec: 0.279636 ( -0.043616 0.044359 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.08885e-08 ( -1.47711e-08 2.01565e-08 ) ergs/cm2
Band function
Time interval is from -1.384 sec. to 5.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.42722 ( -8.57278 6.42722 )
beta : -9.16079 ( -0.839210 19.1607 )
Epeak [keV] : 15.0105 ( -14.9105 74.9949 )
Norm@50keV : 9.122572E-03 ( -9.128374E-02 127.747 )
------------------------------------------------------------
Chi-Squared = 42.43135 using 59 PHA bins.
Reduced chi-squared = 0.7714790 for 55 degrees of freedom
Null hypothesis probability = 0.892
Photon flux (15-150 keV) in 7.000 sec: 0.283543 ( -0.044172 0.043228 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.28506e-08 ( -1.69226e-08 1.76085e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.616 sec. to 2.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.78774 ( -0.690353 0.994172 )
Norm@50keV : 1.670087E-03 ( -1.670087E-03 1.183238E-03) )
------------------------------------------------------------
Chi-Squared = 33.17603 using 59 PHA bins.
Reduced chi-squared = 0.5820356 for 57 degrees of freedom
Null hypothesis probability = 0.995
Photon flux (15-150 keV) in 1.000 sec: 0.395397 ( -0.115864 0.116798 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83291e-08 ( -7.2158e-09 8.6654e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.616 sec. to 2.616 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79067 ( -4.41037 1.83704 )
Epeak [keV] : 5.98245 ( )
Norm@50keV : 8.618296E-03 ( -1.454790E-03 1.393290E-03) )
------------------------------------------------------------
Chi-Squared = 33.53871 using 59 PHA bins.
but latest trial -3.46995 gives Chi-Squared = 20.3620
Reduced chi-squared = 0.5989056 for 56 degrees of freedom
Null hypothesis probability = 0.993
Photon flux (15-150 keV) in 1.000 sec: 0.395233 ( -0.115836 0.116763 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83345e-08 ( -7.2239e-09 8.6539e-09 ) ergs/cm2
Band function
Time interval is from 1.616 sec. to 2.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36276 ( -0.934485 14.0655 )
beta : -2.93969 ( -0.994259 0.689931 )
Epeak [keV] : 13.3371 ( -13.2371 9986.66 )
Norm@50keV : 1.632512E-02 ( -0.142067 0.160870 )
------------------------------------------------------------
Chi-Squared = 33.43693 using 59 PHA bins.
Reduced chi-squared = 0.6079441 for 55 degrees of freedom
Null hypothesis probability = 0.990
Photon flux (15-150 keV) in 1.000 sec: 0.396178 ( -0.11091 0.115788 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85259e-08 ( -5.1219e-09 8.3993e-09 ) ergs/cm2
Plot creation:
Thu Jan 10 18:44:17 EST 2008