batgrbproduct Analysis for Trigger=205164
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 18:11:16 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger205164/GCN5_download_cron
======================================================================
Trigger: 00205164 Segment: 000
BAT Trigger Time: 166682129.568 [s; MET]
Trigger Stop: 166682129.952 [s; MET]
UTC: 2006-04-14T04:35:28.436360 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 286.798640078872 Dec: 9.3219873406636 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.48
Image Trigger?: NO
Rate S/N Ratio: 29.5127091267474 [ if not an image trigger ]
Image S/N Ratio: 11.48
Flight Position: [ source = BAT ]
RA: 286.798640078872 Dec: 9.3219873406636 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 286.826497166534 Dec: 9.32243134378109 [deg; J2000]
{ 19h 07m 18.4s , +09d 19' 20.8" }
+/- 1.83308415036101 [arcmin] (estimated 90% radius based on SNR)
+/- 0.922318831604826 [arcmin] (formal 1-sigma fit error)
SNR: 12.7980416590591
RA = 19h 7m 18.4s (286.826497 deg.)
Dec = 9d 19' 21" (9.322431 deg.)
Angular difference between Flight and Ground position is 1.649566 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0320000052452087 +/- 0.00565686571343518
Measured from: 0.180000007152557
to: 0.212000012397766 [s; relative to TRIGTIME]
T50: 0.0160000026226044 +/- 0.00400000810623169
Measured from: 0.188000023365021
to: 0.204000025987625 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.301999986171722
to: 0.698000013828278 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.180000007152557
to: 0.212000012397766 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.013634 0.011984 0.007072 0.001407
0.001671 0.001605 0.001258 0.000704 [error]
Peak 0.013621 0.012839 0.007682 0.001751
0.001680 0.001648 0.001325 0.000752 [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 4.24e-09 4.07e-09 2.72e-09 2.85e-09 1.22e-08 1.38e-08 erg/cm2
Error 7.63e-10 6.31e-10 7.11e-10 1.32e-09 1.95e-09 2.59e-09 erg/cm2
Peak flux Power-law 3.96e+00 2.19e+00 7.60e-01 3.45e-01 7.09e+00 7.25e+00 ph/cm2/s
Error 7.07e-01 3.24e-01 1.80e-01 1.40e-01 1.04e+00 1.06e+00 ph/cm2/s
Fluence Cutoff-PL 3.77e-09 4.85e-09 3.27e-09 1.26e-09 1.28e-08 1.30e-08 erg/cm2
Error 8.92e-10 9.23e-10 1.00e-09 1.22e-09 2.08e-09 2.32e-09 erg/cm2
Peak flux Cutoff-PL 3.32e+00 2.67e+00 9.95e-01 1.82e-01 7.14e+00 7.17e+00 ph/cm2/s
Error 8.48e-01 4.59e-01 2.82e-01 1.27e-01 1.05e+00 1.06e+00 ph/cm2/s
Fluence Band 3.77e-09 4.80e-09 3.25e-09 1.30e-09 1.27e-08 1.35e-08 erg/cm2
Error 8.83e-10 9.21e-10 1.00e-09 1.16e-09 2.08e-09 0.00e+00 erg/cm2
Peak flux Band 3.32e+00 2.67e+00 9.95e-01 1.83e-01 7.14e+00 7.18e+00 ph/cm2/s
Error 8.48e-01 4.59e-01 2.82e-01 1.33e-01 1.05e+00 1.06e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.578 0.252 - - 3.72e-02 7.51e-03 66.623 57
CPL 1.551 0.765 22.4 19.8 1.31e-01 2.13e-01 62.987 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.526 0.234 - - 3.55e-02 6.75e-03 70.465 57
CPL 1.233 0.909 31.5 21.1 1.67e-01 2.62e-01 64.482 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.032 0.180 0.212
T90 0.032 0.180 0.212
T50 0.016 0.188 0.204
Peak 1.000 -0.302 0.698
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
286.8265 +9.3224 0.0150 6.2 53.9 0.0337 12.8 TRIG_00205164
------------------------------------------
Foreground time interval of the image:
0.148 0.180 (delta_t = 0.032 [sec])
Background time interval of the image:
-239.600 -66.170 (delta_t = 173.430 [sec])
-64.600 0.148 (delta_t = 64.748 [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 0.148 sec. to 0.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.57837 ( -0.228721 0.275361 )
Norm@50keV : 3.722122E-02 ( -7.715840E-03 7.297706E-03) )
------------------------------------------------------------
Chi-Squared = 66.62337 using 59 PHA bins.
Reduced chi-squared = 1.168831 for 57 degrees of freedom
Null hypothesis probability = 0.180
Photon flux (15-150 keV) in 3.2000E-02 sec: 7.67767 ( -1.15245 1.15277 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21802e-08 ( -1.95482e-09 1.9545e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.148 sec. to 0.180 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.55131 ( -1.07448 0.455741 )
Epeak [keV] : 22.4253 ( -21.6460 17.8703 )
Norm@50keV : 0.130719 ( -6.789470E-02 0.358218 )
------------------------------------------------------------
Chi-Squared = 62.98699 using 59 PHA bins.
but latest trial 2.00705 gives Chi-Squared = 23.0078
but latest trial 0.651876 gives Chi-Squared = 0.591007
Reduced chi-squared = 1.124768 for 56 degrees of freedom
Null hypothesis probability = 0.243
Photon flux (15-150 keV) in 3.2000E-02 sec: 7.69189 ( -1.15823 1.15701 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27704e-08 ( -2.07357e-09 2.08038e-09 ) ergs/cm2
Band function
Time interval is from 0.148 sec. to 0.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55339 ( -0.461001 0.534337 )
beta : -9.33945 ( -0.660551 6.61549 )
Epeak [keV] : 22.4722 ( -21.5840 17.8094 )
Norm@50keV : 0.129873 ( -6.890753E-02 0.361080 )
------------------------------------------------------------
Chi-Squared = 62.98797 using 59 PHA bins.
Reduced chi-squared = 1.145236 for 55 degrees of freedom
Null hypothesis probability = 0.215
Photon flux (15-150 keV) in 3.2000E-02 sec: 7.69315 ( -1.1589 1.15637 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27464e-08 ( -2.07149e-09 2.08035e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.148 sec. to 0.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52554 ( -0.213484 0.254223 )
Norm@50keV : 3.554058E-02 ( -6.911507E-03 6.580111E-03) )
------------------------------------------------------------
Chi-Squared = 70.46508 using 59 PHA bins.
Reduced chi-squared = 1.236229 for 57 degrees of freedom
Null hypothesis probability = 0.108
Photon flux (15-150 keV) in 3.6000E-02 sec: 7.09255 ( -1.04123 1.04151 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28836e-08 ( -2.00977e-09 2.00999e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.148 sec. to 0.184 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23292 ( -1.05512 0.762362 )
Epeak [keV] : 31.5198 ( -28.8582 13.3476 )
Norm@50keV : 0.167082 ( -0.105110 0.418602 )
------------------------------------------------------------
Chi-Squared = 64.48219 using 59 PHA bins.
but latest trial 2.66162 gives Chi-Squared = 36.8333
Reduced chi-squared = 1.151468 for 56 degrees of freedom
Null hypothesis probability = 0.204
Photon flux (15-150 keV) in 3.6000E-02 sec: 7.13599 ( -1.04756 1.04685 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38556e-08 ( -2.17796e-09 2.18858e-09 ) ergs/cm2
Band function
Time interval is from 0.148 sec. to 0.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24917 ( -0.559639 0.581121 )
beta : -9.31323 ( -0.686772 6.43814 )
Epeak [keV] : 31.3051 ( -15.1152 13.5751 )
Norm@50keV : 0.163635 ( -9.433407E-02 0.422543 )
------------------------------------------------------------
Chi-Squared = 64.48372 using 59 PHA bins.
Reduced chi-squared = 1.172431 for 55 degrees of freedom
Null hypothesis probability = 0.179
Photon flux (15-150 keV) in 3.6000E-02 sec: 7.13614 ( -1.04769 1.04675 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38347e-08 ( -2.17638e-09 2.18668e-09 ) ergs/cm2
Plot creation:
Mon Dec 31 18:30:43 EST 2007