batgrbproduct Analysis for Trigger=203974
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): Mon Dec 31 17:18:06 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger203974/GCN5_download_cron
======================================================================
Trigger: 00203974 Segment: 000
BAT Trigger Time: 165912212.464 [s; MET]
Trigger Stop: 165912212.816 [s; MET]
UTC: 2006-04-05T06:43:31.350140 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 16 ms to TRIGTIME + 320 ms
BAT
RA: 286.819285595876 Dec: 9.34804224144477 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.08
Image Trigger?: NO
Rate S/N Ratio: 29.1719042916296 [ if not an image trigger ]
Image S/N Ratio: 9.08
Flight Position: [ source = BAT ]
RA: 286.819285595876 Dec: 9.34804224144477 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 286.838655632104 Dec: 9.3381752423478 [deg; J2000]
{ 19h 07m 21.3s , +09d 20' 17.4" }
+/- 2.20550052538031 [arcmin] (estimated 90% radius based on SNR)
+/- 0.882909735158351 [arcmin] (formal 1-sigma fit error)
SNR: 9.82638685208179
RA = 19h 7m 21.3s (286.838656 deg.)
Dec = 9d 20' 17" (9.338175 deg.)
Angular difference between Flight and Ground position is 1.290582 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0239999890327454 +/- 0.0113137103534657
Measured from: 0.128000020980835
to: 0.15200001001358 [s; relative to TRIGTIME]
T50: 0.0120000243186951 +/- 0.00400000810623169
Measured from: 0.136000007390976
to: 0.148000031709671 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.355999976396561
to: 0.644000023603439 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.128000020980835
to: 0.156000018119812 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.014441 0.010685 0.003255 0.000643
0.001867 0.001839 0.001254 0.001000 [error]
Peak 0.014105 0.010472 0.003200 0.000522
0.001899 0.001890 0.001281 0.001055 [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 4.20e-09 2.67e-09 1.09e-09 6.07e-10 8.27e-09 8.57e-09 erg/cm2
Error 8.28e-10 6.17e-10 4.45e-10 4.15e-10 1.69e-09 1.84e-09 erg/cm2
Peak flux Power-law 4.35e+00 1.55e+00 3.13e-01 7.50e-02 6.26e+00 6.29e+00 ph/cm2/s
Error 8.97e-01 3.62e-01 1.30e-01 5.11e-02 1.22e+00 1.22e+00 ph/cm2/s
Fluence Cutoff-PL 4.05e-09 4.46e-09 9.84e-10 2.00e-11 9.50e-09 9.51e-09 erg/cm2
Error 9.49e-10 1.16e-09 6.37e-10 5.90e-11 1.81e-09 1.81e-09 erg/cm2
Peak flux Cutoff-PL 4.05e+00 2.52e+00 3.15e-01 4.20e-03 6.89e+00 6.89e+00 ph/cm2/s
Error 1.03e+00 6.70e-01 1.96e-01 1.15e-02 1.25e+00 1.26e+00 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 4.02e+00 2.59e+00 2.30e-01 1.51e-03 6.76e+00 6.77e+00 ph/cm2/s
Error 1.10e+00 6.72e-01 1.23e-01 2.79e-03 1.23e+00 1.23e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.290 0.346 - - 2.12e-02 6.90e-03 53.658 57
CPL -0.128 2.043 23.2 8.8 3.20e+00 4.70e+01 41.063 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.306 0.364 - - 1.81e-02 6.16e-03 51.627 57
CPL 0.089 1.928 22.4 12.4 1.99e+00 2.71e+01 41.124 56
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 0.028 0.128 0.156
T90 0.024 0.128 0.152
T50 0.012 0.136 0.148
Peak 1.000 -0.356 0.644
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
286.8387 +9.3382 0.0196 4.6 -88.7 0.0289 9.8 TRIG_00203974
------------------------------------------
Foreground time interval of the image:
0.112 0.140 (delta_t = 0.028 [sec])
Background time interval of the image:
-10.480 0.112 (delta_t = 10.592 [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 0.112 sec. to 0.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.29022 ( -0.308321 0.382936 )
Norm@50keV : 2.119778E-02 ( -6.867423E-03 6.935960E-03) )
------------------------------------------------------------
Chi-Squared = 53.65795 using 59 PHA bins.
Reduced chi-squared = 0.9413676 for 57 degrees of freedom
Null hypothesis probability = 0.601
Photon flux (15-150 keV) in 2.8000E-02 sec: 7.25583 ( -1.36202 1.36235 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.27028e-09 ( -1.68655e-09 1.69526e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.112 sec. to 0.140 sec.
Parameters : value lower 90% higher 90%
Photon index: -0.127647 ( -2.41162 1.67432 )
Epeak [keV] : 23.1861 ( -13.6486 4.00579 )
Norm@50keV : 3.19761 ( -3.19761 90.7489 )
------------------------------------------------------------
Chi-Squared = 41.06311 using 59 PHA bins.
but latest trial -2.53753 gives Chi-Squared = 4.10212
but latest trial 29.6756 gives Chi-Squared = 4.18513
Reduced chi-squared = 0.7332698 for 56 degrees of freedom
Null hypothesis probability = 0.933
Photon flux (15-150 keV) in 2.8000E-02 sec: 8.02560 ( -1.40562 1.4097 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.50337e-09 ( -1.80334e-09 1.82344e-09 ) ergs/cm2
Band function
Time interval is from 0.112 sec. to 0.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.76429 ( -7.60964 0.313035 )
beta : -9.28797 ( )
Epeak [keV] : 9.51103 ( )
Norm@50keV : 0.123622 ( )
------------------------------------------------------------
Chi-Squared = 53.87001 using 59 PHA bins.
Reduced chi-squared = 0.9794548 for 55 degrees of freedom
Null hypothesis probability = 0.518
Photon flux (15-150 keV) in 2.8000E-02 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 0.112 sec. to 0.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.30601 ( -0.321300 0.407193 )
Norm@50keV : 1.805906E-02 ( -6.156752E-03 6.172583E-03) )
------------------------------------------------------------
Chi-Squared = 51.62693 using 59 PHA bins.
Reduced chi-squared = 0.9057356 for 57 degrees of freedom
Null hypothesis probability = 0.676
Photon flux (15-150 keV) in 3.2000E-02 sec: 6.25812 ( -1.21511 1.21507 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12506e-09 ( -1.72067e-09 1.72102e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.112 sec. to 0.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.900739E-02 ( -2.15170 1.70472 )
Epeak [keV] : 22.3703 ( -17.3909 7.44232 )
Norm@50keV : 1.99213 ( -1.99213 52.2758 )
------------------------------------------------------------
Chi-Squared = 41.12389 using 59 PHA bins.
Reduced chi-squared = 0.7343551 for 56 degrees of freedom
Null hypothesis probability = 0.932
Photon flux (15-150 keV) in 3.2000E-02 sec: 6.89376 ( -1.25193 1.25801 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.31331e-09 ( -1.84429e-09 1.85696e-09 ) ergs/cm2
Band function
Time interval is from 0.112 sec. to 0.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.76057 ( -7.74200 0.248716 )
beta : -9.17210 ( -0.409728 0.317803 )
Epeak [keV] : 10.5377 ( -10.4377 9989.46 )
Norm@50keV : 9.617836E-02 ( -1.08439 19.0369 )
------------------------------------------------------------
Chi-Squared = 55.53651 using 59 PHA bins.
Reduced chi-squared = 1.009755 for 55 degrees of freedom
Null hypothesis probability = 0.454
Photon flux (15-150 keV) in 3.2000E-02 sec: 6.76440 ( -1.23301 1.23301 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.14608e-09 ( -1.73261e-09 1.6608e-09 ) ergs/cm2
Plot creation:
Mon Dec 31 17:36:45 EST 2007