batgrbproduct Analysis for Trigger=232585
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 2 08:06:59 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger232585/GCN5_download_cron
======================================================================
Trigger: 00232585 Segment: 000
BAT Trigger Time: 181845952 [s; MET]
Trigger Stop: 181846016 [s; MET]
UTC: 2006-10-06T16:45:50.510340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 111.090082281944 Dec: -79.2018093198341 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.5
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.5
Flight Position: [ source = BAT ]
RA: 111.090082281944 Dec: -79.2018093198341 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 111.031568183955 Dec: -79.1961957593836 [deg; J2000]
{ 07h 24m 07.6s , -79d 11' 46.3" }
+/- 1.80046298901971 [arcmin] (estimated 90% radius based on SNR)
+/- 0.852724370234441 [arcmin] (formal 1-sigma fit error)
SNR: 13.1305770060611
RA = 7h 24m 7.6s (111.031568 deg.)
Dec = -79d 11' 46" (-79.196196 deg.)
Angular difference between Flight and Ground position is 0.739129 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 130.09999999404 +/- 30.2743297818761
Measured from: -22.7199999988079
to: 107.379999995232 [s; relative to TRIGTIME]
T50: 56.391999989748 +/- 20.9207786523386
Measured from: -22.3039999902248
to: 34.0879999995232 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -23.1999999880791
to: -22.1999999880791 [s; relative to TRIGTIME]
Total Fluence
Measured from: -23.2319999933243
to: 137.724000006914 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.832520 0.903223 0.543412 0.179219
0.068391 0.068984 0.061170 0.054126 [error]
Peak 0.114840 0.213735 0.261775 0.087300
0.006764 0.008187 0.009005 0.007364 [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 2.48e-07 3.94e-07 4.71e-07 1.10e-06 1.43e-06 2.22e-06 erg/cm2
Error 3.63e-08 3.50e-08 6.14e-08 3.05e-07 1.42e-07 3.56e-07 erg/cm2
Peak flux Power-law 1.11e+00 1.58e+00 1.66e+00 3.21e+00 5.36e+00 7.56e+00 ph/cm2/s
Error 1.01e-01 8.47e-02 7.00e-02 2.37e-01 2.22e-01 3.38e-01 ph/cm2/s
Fluence Cutoff-PL 2.48e-07 3.94e-07 4.72e-07 1.09e-06 1.43e-06 2.08e-06 erg/cm2
Error 3.64e-08 3.50e-08 6.15e-08 3.02e-07 1.42e-07 5.45e-07 erg/cm2
Peak flux Cutoff-PL 1.11e+00 1.58e+00 1.66e+00 3.19e+00 5.35e+00 7.54e+00 ph/cm2/s
Error 1.01e-01 8.47e-02 7.01e-02 3.08e-01 2.22e-01 3.37e-01 ph/cm2/s
Fluence Band 2.42e-07 3.99e-07 4.68e-07 1.05e-06 1.42e-06 2.14e-06 erg/cm2
Error 3.35e-08 4.48e-08 4.80e-08 3.74e-07 1.30e-07 4.50e-07 erg/cm2
Peak flux Band 1.08e+00 1.58e+00 1.68e+00 2.91e+00 5.34e+00 7.25e+00 ph/cm2/s
Error 1.30e-01 8.70e-02 9.13e-02 6.34e-01 2.27e-01 6.66e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.741 0.166 - - 9.63e-04 9.16e-05 49.547 57
CPL 1.529 0.000 106.1 0.0 1.24e-03 5.89e-04 49.992 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.929 0.074 - - 4.66e-02 1.91e-03 43.954 57
CPL 0.821 0.233 665.7 5000.0 5.18e-02 1.13e-02 43.574 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: 46.784000 sec.
T50 in the 50-300 keV band: 27.584000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 160.956 -23.232 137.724
T90 130.100 -22.720 107.380
T50 56.392 -22.304 34.088
Peak 1.000 -23.200 -22.200
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
111.0316 -79.1962 0.0146 33.6 -20.2 1.3370 13.1 TRIG_00232585
------------------------------------------
Foreground time interval of the image:
-7.899 70.001 (delta_t = 77.900 [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 -23.232 sec. to 137.724 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74101 ( -0.164284 0.167723 )
Norm@50keV : 9.625164E-04 ( -9.228720E-05 9.101268E-05) )
------------------------------------------------------------
Chi-Squared = 49.54667 using 59 PHA bins.
Reduced chi-squared = 0.8692398 for 57 degrees of freedom
Null hypothesis probability = 0.748
Photon flux (15-150 keV) in 161.0 sec: 0.129720 ( -0.011664 0.011694 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43065e-06 ( -1.41686e-07 1.43224e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -23.232 sec. to 137.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52900 ( )
Epeak [keV] : 106.073 ( )
Norm@50keV : 1.243467E-03 ( -1.470492E-04 1.031785E-03) )
------------------------------------------------------------
Chi-Squared = 49.99211 using 59 PHA bins.
Reduced chi-squared = 0.8927162 for 56 degrees of freedom
Null hypothesis probability = 0.700
Photon flux (15-150 keV) in 161.0 sec: 0.129673 ( -0.01166 0.01169 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43073e-06 ( -1.4172e-07 1.43267e-07 ) ergs/cm2
Band function
Time interval is from -23.232 sec. to 137.724 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32851 ( -8.67149 3.64389 )
beta : -1.74763 ( -8.25237 0.170571 )
Epeak [keV] : 37.4366 ( -37.3366 9962.56 )
Norm@50keV : 2.015592E-03 ( -2.015592E-03 11.0915 )
------------------------------------------------------------
Chi-Squared = 49.53576 using 59 PHA bins.
Reduced chi-squared = 0.9006501 for 55 degrees of freedom
Null hypothesis probability = 0.683
Photon flux (15-150 keV) in 161.0 sec: 0.129732 ( -0.006267 0.011897 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42139e-06 ( -1.34955e-07 1.24749e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -23.200 sec. to -22.200 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.928995 ( -7.485068E-02 7.405853E-02) )
Norm@50keV : 4.664062E-02 ( -1.911901E-03 1.905639E-03) )
------------------------------------------------------------
Chi-Squared = 43.95355 using 59 PHA bins.
Reduced chi-squared = 0.7711149 for 57 degrees of freedom
Null hypothesis probability = 0.897
Photon flux (15-150 keV) in 1.000 sec: 5.35565 ( -0.22141 0.22166 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.17647e-07 ( -2.2274e-08 2.2335e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -23.200 sec. to -22.200 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.820705 ( -0.293556 0.171567 )
Epeak [keV] : 665.658 ( -665.648 9334.34 )
Norm@50keV : 5.180958E-02 ( -6.129093E-03 1.639434E-02) )
------------------------------------------------------------
Chi-Squared = 43.57422 using 59 PHA bins.
but latest trial 4.658787E-02 gives Chi-Squared = 0.520744
Reduced chi-squared = 0.7781110 for 56 degrees of freedom
Null hypothesis probability = 0.887
Photon flux (15-150 keV) in 1.000 sec: 5.35420 ( -0.22133 0.22173 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16683e-07 ( -2.2281e-08 2.1976e-08 ) ergs/cm2
Band function
Time interval is from -23.200 sec. to -22.200 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.804678 ( -9.19532 5.77779 )
beta : -0.928996 ( -7.405847E-02 7.485080E-02) )
Epeak [keV] : 39.8714 ( -9999.90 2.929688E-03) )
Norm@50keV : 7.197384E-02 ( -1.918204E-03 1.912136E-03) )
------------------------------------------------------------
Chi-Squared = 43.95354 using 59 PHA bins.
Reduced chi-squared = 0.7991554 for 55 degrees of freedom
Null hypothesis probability = 0.857
Photon flux (15-150 keV) in 1.000 sec: 5.33548 ( -0.22754 0.22705 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16343e-07 ( -2.2753e-08 2.2649e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 08:25:10 EST 2008