batgrbproduct Analysis for Trigger=113872
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): Fri Jan 4 23:18:02 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger113872/SDC
======================================================================
Trigger: 00113872 Segment: 000
BAT Trigger Time: 134495927.872 [s; MET]
Trigger Stop: 134495929.92 [s; MET]
UTC: 2005-04-06T15:58:48.407200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 34.4284384928714 Dec: -50.1778978956069 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: NO
Rate S/N Ratio: 9.48683298050514 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 34.4284384928714 Dec: -50.1778978956069 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 34.4135776648794 Dec: -50.1834265879898 [deg; J2000]
{ 02h 17m 39.3s , -50d 11' 00.3" }
+/- 2.52623187783223 [arcmin] (estimated 90% radius based on SNR)
+/- 1.13737204631058 [arcmin] (formal 1-sigma fit error)
SNR: 8.09387792431356
RA = 2h 17m 39.3s (34.413578 deg.)
Dec = -50d 11' 0" (-50.183427 deg.)
Angular difference between Flight and Ground position is 0.660351 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 5.95199999213219 +/- 1.53241248589161
Measured from: -2.28800001740456
to: 3.66399997472763 [s; relative to TRIGTIME]
T50: 2.22399997711182 +/- 1.43815436425235
Measured from: -0.208000004291534
to: 2.01599997282028 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.17199999094009
to: 2.17199999094009 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.56000000238419
to: 3.87199997901917 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.077019 0.081222 0.007370 0.008017
0.010874 0.011135 0.009480 0.007977 [error]
Peak 0.019506 0.018729 0.004707 0.002888
0.004460 0.004426 0.003744 0.003269 [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 2.51e-08 2.60e-08 1.91e-08 2.24e-08 7.89e-08 9.19e-08 erg/cm2
Error 4.95e-09 5.22e-09 7.30e-09 1.59e-08 1.76e-08 2.72e-08 erg/cm2
Peak flux Power-law 1.90e-01 1.14e-01 4.40e-02 2.26e-02 3.60e-01 3.71e-01 ph/cm2/s
Error 6.20e-02 3.57e-02 2.52e-02 2.39e-02 1.01e-01 1.06e-01 ph/cm2/s
Fluence Cutoff-PL 2.35e-08 3.35e-08 1.08e-08 3.85e-10 6.81e-08 6.84e-08 erg/cm2
Error 5.75e-09 7.59e-09 8.24e-09 2.83e-09 1.44e-08 1.45e-08 erg/cm2
Peak flux Cutoff-PL 1.88e-01 1.43e-01 1.93e-02 2.07e-04 3.50e-01 3.50e-01 ph/cm2/s
Error 6.99e-02 5.14e-02 3.10e-02 1.70e-02 9.77e-02 9.77e-02 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.89e-01 1.39e-01 2.64e-02 8.46e-04 3.55e-01 3.55e-01 ph/cm2/s
Error 4.28e-02 3.23e-02 1.08e-02 1.98e-02 9.63e-02 9.56e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.451 0.354 - - 1.24e-03 3.56e-04 81.308 57
CPL -0.102 2.331 27.9 10.7 5.76e-02 1.26e+00 74.990 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.380 0.565 - - 1.97e-03 8.80e-04 45.214 57
CPL 0.054 2.505 26.2 18.6 7.72e-02 0.00e+00 43.081 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 6.432 -2.560 3.872
T90 5.952 -2.288 3.664
T50 2.224 -0.208 2.016
Peak 1.000 1.172 2.172
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
34.4136 -50.1834 0.0237 15.1 33.9 0.1684 8.1 TRIG_00113872
------------------------------------------
Foreground time interval of the image:
-2.560 3.872 (delta_t = 6.432 [sec])
Background time interval of the image:
-299.872 -2.560 (delta_t = 297.312 [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 -2.560 sec. to 3.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.45137 ( -0.328887 0.378898 )
Norm@50keV : 1.242144E-03 ( -3.543009E-04 3.570780E-04) )
------------------------------------------------------------
Chi-Squared = 81.30814 using 59 PHA bins.
Reduced chi-squared = 1.426459 for 57 degrees of freedom
Null hypothesis probability = 1.895E-02
Photon flux (15-150 keV) in 6.432 sec: 0.236883 ( -0.040537 0.040601 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.88589e-08 ( -1.70604e-08 1.81993e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.560 sec. to 3.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.101786 ( -2.89821 1.76330 )
Epeak [keV] : 27.9020 ( -14.5144 6.82971 )
Norm@50keV : 5.760079E-02 ( -5.760079E-02 2.45620 )
------------------------------------------------------------
Chi-Squared = 74.98971 using 59 PHA bins.
Reduced chi-squared = 1.339102 for 56 degrees of freedom
Null hypothesis probability = 4.594E-02
Photon flux (15-150 keV) in 6.432 sec: 0.230310 ( -0.039237 0.039493 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.81445e-08 ( -1.33071e-08 1.54542e-08 ) ergs/cm2
Band function
Time interval is from -2.560 sec. to 3.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03160 ( -1.76634 2.31518 )
beta : -9.34094 ( )
Epeak [keV] : 23.6962 ( )
Norm@50keV : 1.042054E-02 ( )
------------------------------------------------------------
Chi-Squared = 76.15299 using 59 PHA bins.
Reduced chi-squared = 1.384600 for 55 degrees of freedom
Null hypothesis probability = 3.102E-02
Photon flux (15-150 keV) in 6.432 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.168 sec. to 2.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37998 ( -0.507881 0.622139 )
Norm@50keV : 1.970156E-03 ( -8.708518E-04 8.884079E-04) )
------------------------------------------------------------
Chi-Squared = 45.21364 using 59 PHA bins.
Reduced chi-squared = 0.7932217 for 57 degrees of freedom
Null hypothesis probability = 0.870
Photon flux (15-150 keV) in 1.008 sec: 0.360379 ( -0.100842 0.10114 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92853e-08 ( -6.66611e-09 7.38642e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.168 sec. to 2.176 sec.
Parameters : value lower 90% higher 90%
Photon index: 5.365522E-02 ( -3.05366 1.95662 )
Epeak [keV] : 26.1889 ( -23.0369 14.0700 )
Norm@50keV : 7.722888E-02 ( )
------------------------------------------------------------
Chi-Squared = 43.08094 using 59 PHA bins.
but latest trial 2.02297 gives Chi-Squared = 3.57881
but latest trial 3.15195 gives Chi-Squared = 1.27177
Reduced chi-squared = 0.7693024 for 56 degrees of freedom
Null hypothesis probability = 0.897
Photon flux (15-150 keV) in 1.008 sec: 0.350484 ( -0.096846 0.098611 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55979e-08 ( -5.09151e-09 7.72713e-09 ) ergs/cm2
Band function
Time interval is from 1.168 sec. to 2.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.737739 ( -9.26226 5.73774 )
beta : -9.36866 ( -0.631339 19.3687 )
Epeak [keV] : 25.5400 ( -25.4400 74.6746 )
Norm@50keV : 2.466714E-02 ( -2.44361 253.422 )
------------------------------------------------------------
Chi-Squared = 43.30975 using 59 PHA bins.
Reduced chi-squared = 0.7874500 for 55 degrees of freedom
Null hypothesis probability = 0.873
Photon flux (15-150 keV) in 1.008 sec: 0.355025 ( -0.095587 0.096935 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69203e-08 ( -6.12703e-09 7.84153e-09 ) ergs/cm2
Plot creation:
Fri Jan 4 23:40:36 EST 2008