batgrbproduct Analysis for Trigger=230662
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 05:16:09 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger230662/GCN5_download_cron
======================================================================
Trigger: 00230662 Segment: 000
BAT Trigger Time: 180681136.832 [s; MET]
Trigger Stop: 180681137.856 [s; MET]
UTC: 2006-09-23T05:12:15.370360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 254.6230284423 Dec: 12.3791714036898 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.22
Image Trigger?: NO
Rate S/N Ratio: 11.8743420870379 [ if not an image trigger ]
Image S/N Ratio: 7.22
Flight Position: [ source = BAT ]
RA: 254.6230284423 Dec: 12.3791714036898 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 254.621425547464 Dec: 12.3417709313121 [deg; J2000]
{ 16h 58m 29.1s , +12d 20' 30.4" }
+/- 2.21007972692287 [arcmin] (estimated 90% radius based on SNR)
+/- 0.900424955083281 [arcmin] (formal 1-sigma fit error)
SNR: 9.79731419718656
RA = 16h 58m 29.1s (254.621426 deg.)
Dec = 12d 20' 30" (12.341771 deg.)
Angular difference between Flight and Ground position is 2.245994 arcmin
Partial Coding Fraction: 0.3398438 [ including projection effects ]
Duration
T90: 51.6520000100136 +/- 4.31663248830958
Measured from: -40.83599999547
to: 10.8160000145435 [s; relative to TRIGTIME]
T50: 26.0480000078678 +/- 12.9279772654958
Measured from: -23.2399999797344
to: 2.80800002813339 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0320000052452087
to: 1.03200000524521 [s; relative to TRIGTIME]
Total Fluence
Measured from: -42.2519999742508
to: 11.4880000054836 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.458405 0.599308 0.333714 0.016162
0.071038 0.068954 0.058387 0.047738 [error]
Peak 0.042235 0.065848 0.048294 0.013781
0.010378 0.010420 0.009227 0.007190 [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 1.44e-07 2.35e-07 2.90e-07 7.08e-07 8.69e-07 1.37e-06 erg/cm2
Error 3.13e-08 3.31e-08 5.52e-08 2.76e-07 1.33e-07 3.26e-07 erg/cm2
Peak flux Power-law 4.15e-01 4.34e-01 3.22e-01 3.84e-01 1.32e+00 1.56e+00 ph/cm2/s
Error 1.44e-01 9.16e-02 7.32e-02 1.85e-01 2.57e-01 2.93e-01 ph/cm2/s
Fluence Cutoff-PL 1.18e-07 2.72e-07 3.04e-07 1.46e-07 7.98e-07 8.45e-07 erg/cm2
Error 3.81e-08 4.57e-08 6.74e-08 2.00e-07 1.42e-07 2.58e-07 erg/cm2
Peak flux Cutoff-PL 4.07e-01 4.39e-01 3.25e-01 3.39e-01 1.31e+00 1.51e+00 ph/cm2/s
Error 1.65e-01 1.05e-01 8.30e-02 2.61e-01 2.59e-01 3.75e-01 ph/cm2/s
Fluence Band 1.17e-07 2.70e-07 3.04e-07 1.49e-07 7.99e-07 8.48e-07 erg/cm2
Error 1.88e-08 4.25e-08 3.60e-08 2.89e-07 1.43e-07 1.43e-07 erg/cm2
Peak flux Band 3.90e-01 4.49e-01 3.27e-01 3.32e-01 1.30e+00 1.49e+00 ph/cm2/s
Error 1.48e-01 1.13e-01 8.21e-02 1.42e-01 2.58e-01 3.72e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.696 0.232 - - 1.75e-03 2.56e-04 72.561 57
CPL 0.318 1.301 57.9 28.7 9.22e-03 2.73e-02 67.762 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.434 0.336 - - 1.07e-02 2.02e-03 60.610 57
CPL 1.287 1.533 251.6 5000.0 1.27e-02 3.03e-02 60.596 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: 3.584000 sec.
T50 in the 50-300 keV band: 2.112000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 53.740 -42.252 11.488
T90 51.652 -40.836 10.816
T50 26.048 -23.240 2.808
Peak 1.000 0.032 1.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
254.6214 +12.3418 0.0195 33.5 -78.8 1.4820 9.8 TRIG_00230662
------------------------------------------
Foreground time interval of the image:
-42.252 10.969 (delta_t = 53.221 [sec])
Background time interval of the image:
-239.832 -42.252 (delta_t = 197.580 [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 -42.252 sec. to 11.488 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69554 ( -0.229310 0.235297 )
Norm@50keV : 1.746392E-03 ( -2.573251E-04 2.545665E-04) )
------------------------------------------------------------
Chi-Squared = 72.56118 using 59 PHA bins.
Reduced chi-squared = 1.273003 for 57 degrees of freedom
Null hypothesis probability = 8.019E-02
Photon flux (15-150 keV) in 53.74 sec: 0.231587 ( -0.032754 0.032836 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.69363e-07 ( -1.32646e-07 1.34173e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -42.252 sec. to 11.488 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.318320 ( -1.49937 1.10274 )
Epeak [keV] : 57.9025 ( -11.8330 45.6371 )
Norm@50keV : 9.220421E-03 ( -9.220421E-03 4.530887E-02) )
------------------------------------------------------------
Chi-Squared = 67.76173 using 59 PHA bins.
Reduced chi-squared = 1.210031 for 56 degrees of freedom
Null hypothesis probability = 0.135
Photon flux (15-150 keV) in 53.74 sec: 0.220469 ( -0.034311 0.03416 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.98179e-07 ( -1.39369e-07 1.45254e-07 ) ergs/cm2
Band function
Time interval is from -42.252 sec. to 11.488 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.326921 ( -1.09468 1.21106 )
beta : -7.01270 ( -2.98730 17.0121 )
Epeak [keV] : 57.9392 ( -11.8290 45.7429 )
Norm@50keV : 9.132854E-03 ( -9.132854E-03 8.639027E-03) )
------------------------------------------------------------
Chi-Squared = 67.76198 using 59 PHA bins.
Reduced chi-squared = 1.232036 for 55 degrees of freedom
Null hypothesis probability = 0.116
Photon flux (15-150 keV) in 53.74 sec: 0.220648 ( -0.031965 0.034045 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.98544e-07 ( -1.41997e-07 1.44195e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.032 sec. to 1.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43389 ( -0.337347 0.334362 )
Norm@50keV : 1.074262E-02 ( -2.018550E-03 2.012028E-03) )
------------------------------------------------------------
Chi-Squared = 60.61047 using 59 PHA bins.
Reduced chi-squared = 1.063342 for 57 degrees of freedom
Null hypothesis probability = 0.347
Photon flux (15-150 keV) in 1.000 sec: 1.31867 ( -0.25626 0.25771 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03079e-07 ( -2.09366e-08 2.1235e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.032 sec. to 1.032 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28666 ( -1.70568 1.35998 )
Epeak [keV] : 251.639 ( -251.629 9748.36 )
Norm@50keV : 1.271563E-02 ( -3.960059E-03 5.659397E-02) )
------------------------------------------------------------
Chi-Squared = 60.59630 using 59 PHA bins.
but latest trial 8.908480E-02 gives Chi-Squared = 78.0847
Reduced chi-squared = 1.082077 for 56 degrees of freedom
Null hypothesis probability = 0.314
Photon flux (15-150 keV) in 1.000 sec: 1.31382 ( -0.26179 0.25694 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01873e-07 ( -2.28288e-08 2.236e-08 ) ergs/cm2
Band function
Time interval is from 0.032 sec. to 1.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.995600 ( -9.00440 4.87498 )
beta : -1.63937 ( -8.36063 0.535367 )
Epeak [keV] : 106.530 ( -106.430 425.797 )
Norm@50keV : 1.821115E-02 ( -1.821114E-02 5538.76 )
------------------------------------------------------------
Chi-Squared = 60.49690 using 59 PHA bins.
Reduced chi-squared = 1.099944 for 55 degrees of freedom
Null hypothesis probability = 0.284
Photon flux (15-150 keV) in 1.000 sec: 1.30336 ( -0.25477 0.26094 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01236e-07 ( -1.89515e-08 1.3217e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 05:38:20 EST 2008