batgrbproduct Analysis for Trigger=230341
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 04:54:17 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger230341/GCN5_download_cron
======================================================================
Trigger: 00230341 Segment: 000
BAT Trigger Time: 180495292.472 [s; MET]
Trigger Stop: 180495292.808 [s; MET]
UTC: 2006-09-21T01:34:51.014800 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 8 ms to TRIGTIME + 320 ms
BAT
RA: 251.755655109556 Dec: -45.8914668446844 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.89
Image Trigger?: NO
Rate S/N Ratio: 16.9115345252878 [ if not an image trigger ]
Image S/N Ratio: 5.89
Flight Position: [ source = BAT ]
RA: 251.755655109556 Dec: -45.8914668446844 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.679251373825 Dec: -45.9708131585383 [deg; J2000]
{ 16h 46m 43.0s , -45d 58' 14.9" }
+/- 6.40054424228826 [arcmin] (estimated 90% radius based on SNR)
+/- 5.59985390769077 [arcmin] (formal 1-sigma fit error)
SNR: 2.14476614572229
RA = 16h 46m 43.0s (251.679251 deg.)
Dec = -45d 58' 15" (-45.970813 deg.)
Angular difference between Flight and Ground position is 5.729843 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 0.335999965667725 +/-
Measured from: 0
to: 0.335999965667725 [s; relative to TRIGTIME]
T50: 0.335999965667725 +/-
Measured from: 0
to: 0.335999965667725 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.335999965667725 second)
Measured from: 0
to: 0.335999965667725 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.335999965667725 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.010029 0.005301 0.002800 -0.003064
0.003889 0.003483 0.002735 0.002387 [error]
Peak 0.010029 0.005301 0.002800 -0.003064
0.003889 0.003483 0.002735 0.002387 [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 2.68e-09 2.69e-09 1.91e-09 2.16e-09 8.13e-09 9.56e-09 erg/cm2
Error 1.65e-09 2.15e-09 2.08e-09 5.54e-09 5.41e-09 8.74e-09 erg/cm2
Peak flux Power-law 2.62e-01 1.47e-01 5.23e-02 2.43e-02 4.75e-01 4.86e-01 ph/cm2/s
Error 1.65e-01 1.16e-01 5.85e-02 5.58e-02 2.50e-01 2.59e-01 ph/cm2/s
Fluence Cutoff-PL 2.49e-09 3.13e-09 1.90e-09 5.53e-10 7.94e-09 8.14e-09 erg/cm2
Error 2.16e-09 2.23e-09 2.39e-09 5.21e-09 5.22e-09 8.36e-09 erg/cm2
Peak flux Cutoff-PL 2.41e-01 1.70e-01 5.33e-02 7.99e-03 4.71e-01 4.72e-01 ph/cm2/s
Error 2.13e-01 1.17e-01 6.55e-02 5.26e-02 2.49e-01 2.52e-01 ph/cm2/s
Fluence Band 2.48e-09 3.09e-09 1.89e-09 5.77e-10 7.93e-09 8.35e-09 erg/cm2
Error 2.13e-09 2.19e-09 2.39e-09 2.71e-09 5.20e-09 0.00e+00 erg/cm2
Peak flux Band 2.66e-01 1.51e-01 5.12e-02 7.58e-03 4.71e-01 4.91e-01 ph/cm2/s
Error 2.24e-01 9.64e-02 6.68e-02 5.37e-02 1.88e-01 2.58e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.495 1.388 - - 2.42e-03 2.25e-03 61.344 57
CPL 1.417 3.673 22.4 5000.0 1.05e-02 1.59e+00 61.116 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.495 1.388 - - 2.42e-03 2.25e-03 61.344 57
CPL 1.417 2.531 22.4 5000.0 1.05e-02 1.59e+00 61.116 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 0.336 0.000 0.336
T90 0.336 0.000 0.336
T50 0.336 0.000 0.336
Peak 0.336 0.000 0.336
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.6793 -45.9708 0.0893 17.4 -68.8 0.0136 2.1 TRIG_00230341
------------------------------------------
Foreground time interval of the image:
-0.008 0.328 (delta_t = 0.336 [sec])
Background time interval of the image:
-10.480 -4.480 (delta_t = 6.000 [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 -0.008 sec. to 0.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.49548 ( -0.979760 1.79556 )
Norm@50keV : 2.422357E-03 ( -2.422357E-03 2.075394E-03) )
------------------------------------------------------------
Chi-Squared = 61.34421 using 59 PHA bins.
Reduced chi-squared = 1.076214 for 57 degrees of freedom
Null hypothesis probability = 0.323
Photon flux (15-150 keV) in 0.3360 sec: 0.474501 ( -0.250132 0.250412 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12811e-09 ( -5.01618e-09 5.79442e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41689 ( -4.41689 2.92985 )
Epeak [keV] : 22.4383 ( -22.4283 9977.56 )
Norm@50keV : 1.046724E-02 ( -1.046724E-02 3.16836 )
------------------------------------------------------------
Chi-Squared = 61.11590 using 59 PHA bins.
Reduced chi-squared = 1.091355 for 56 degrees of freedom
Null hypothesis probability = 0.297
Photon flux (15-150 keV) in 0.3360 sec: 0.471006 ( -0.250007 0.248877 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.93965e-09 ( -4.73424e-09 5.71556e-09 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59504 ( -8.40496 6.59225 )
beta : -9.15372 ( -0.846278 7.59653 )
Epeak [keV] : 18.8987 ( -18.7987 9981.10 )
Norm@50keV : 8.177389E-03 ( -8.177388E-03 36.0134 )
------------------------------------------------------------
Chi-Squared = 61.12054 using 59 PHA bins.
Reduced chi-squared = 1.111283 for 55 degrees of freedom
Null hypothesis probability = 0.266
Photon flux (15-150 keV) in 0.3360 sec: 0.471385 ( -0.249956 0.12611 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.93101e-09 ( -4.69684e-09 5.70938e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.008 sec. to 0.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.49548 ( -0.979760 1.79556 )
Norm@50keV : 2.422357E-03 ( -2.422357E-03 2.075394E-03) )
------------------------------------------------------------
Chi-Squared = 61.34421 using 59 PHA bins.
Reduced chi-squared = 1.076214 for 57 degrees of freedom
Null hypothesis probability = 0.323
Photon flux (15-150 keV) in 0.3360 sec: 0.474501 ( -0.250132 0.250412 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12811e-09 ( -5.01618e-09 5.79442e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41689 ( -4.41689 0.644140 )
Epeak [keV] : 22.4383 ( -22.4283 9977.56 )
Norm@50keV : 1.046724E-02 ( -1.046724E-02 3.16836 )
------------------------------------------------------------
Chi-Squared = 61.11590 using 59 PHA bins.
Reduced chi-squared = 1.091355 for 56 degrees of freedom
Null hypothesis probability = 0.297
Photon flux (15-150 keV) in 0.3360 sec: 0.471006 ( -0.250007 0.248877 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.93965e-09 ( -4.73424e-09 5.71556e-09 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59504 ( -8.40496 6.59225 )
beta : -9.15372 ( -0.846278 7.59653 )
Epeak [keV] : 18.8987 ( -18.7987 9981.10 )
Norm@50keV : 8.177389E-03 ( -8.177388E-03 36.0134 )
------------------------------------------------------------
Chi-Squared = 61.12054 using 59 PHA bins.
Reduced chi-squared = 1.111283 for 55 degrees of freedom
Null hypothesis probability = 0.266
Photon flux (15-150 keV) in 0.3360 sec: 0.471385 ( -0.249956 0.12611 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.93101e-09 ( -4.69684e-09 5.70938e-09 ) ergs/cm2
Plot creation:
Wed Jan 2 04:59:01 EST 2008