batgrbproduct Analysis for Trigger=231702
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 07:13:55 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger231702/SDC
======================================================================
Trigger: 00231702 Segment: 000
BAT Trigger Time: 181252502.528 [s; MET]
Trigger Stop: 181252506.624 [s; MET]
UTC: 2006-09-29T19:55:01.052660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 263.164465019978 Dec: 29.8148078195528 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.67
Image Trigger?: NO
Rate S/N Ratio: 8.60232526704263 [ if not an image trigger ]
Image S/N Ratio: 8.67
Flight Position: [ source = BAT ]
RA: 263.164465019978 Dec: 29.8148078195528 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 263.14993463209 Dec: 29.8212037299161 [deg; J2000]
{ 17h 32m 36.0s , +29d 49' 16.3" }
+/- 2.80403658273578 [arcmin] (estimated 90% radius based on SNR)
+/- 1.33927823990739 [arcmin] (formal 1-sigma fit error)
SNR: 6.97312443482061
RA = 17h 32m 36.0s (263.149935 deg.)
Dec = 29d 49' 16" (29.821204 deg.)
Angular difference between Flight and Ground position is 0.848181 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 552 +/- 27.6586333718787
Measured from: -2.52799999713898
to: 549.472000002861 [s; relative to TRIGTIME]
T50: 521 +/- 595.628239760339
Measured from: 3.47200000286102
to: 524.472000002861 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.47200000286102
to: 3.47200000286102 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.52799999713898
to: 555.472000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.681817 0.512151 0.380719 0.059753
0.118238 0.116412 0.103253 0.092795 [error]
Peak 0.012480 0.021197 0.014683 0.001136
0.005814 0.005395 0.004873 0.004010 [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 1.62e-07 2.43e-07 2.73e-07 5.81e-07 8.52e-07 1.26e-06 erg/cm2
Error 5.22e-08 5.30e-08 1.02e-07 4.58e-07 2.34e-07 5.60e-07 erg/cm2
Peak flux Power-law 1.22e-01 1.37e-01 1.10e-01 1.46e-01 4.22e-01 5.14e-01 ph/cm2/s
Error 7.08e-02 4.76e-02 3.95e-02 1.20e-01 1.30e-01 1.58e-01 ph/cm2/s
Fluence Cutoff-PL 1.62e-07 2.43e-07 2.73e-07 5.75e-07 8.52e-07 1.19e-06 erg/cm2
Error 5.23e-08 5.30e-08 1.03e-07 4.54e-07 2.34e-07 6.32e-07 erg/cm2
Peak flux Cutoff-PL 1.21e-01 1.37e-01 1.10e-01 1.46e-01 4.22e-01 5.06e-01 ph/cm2/s
Error 7.08e-02 4.76e-02 3.96e-02 1.19e-01 1.30e-01 1.19e-01 ph/cm2/s
Fluence Band 1.62e-07 2.55e-07 2.42e-07 4.08e-07 8.03e-07 1.24e-06 erg/cm2
Error 5.81e-08 5.72e-08 1.01e-07 3.05e-07 2.01e-07 5.54e-07 erg/cm2
Peak flux Band 1.19e-01 1.36e-01 1.10e-01 1.46e-01 4.22e-01 5.06e-01 ph/cm2/s
Error 7.64e-02 4.06e-02 3.96e-02 1.27e-01 1.30e-01 1.89e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.834 0.437 - - 1.66e-04 4.50e-05 49.663 57
CPL 1.536 0.000 68.6 0.0 2.42e-04 4.80e-04 50.010 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.316 0.583 - - 3.53e-03 1.04e-03 65.937 57
CPL 1.110 1.820 231.8 0.0 4.37e-03 1.05e-03 65.988 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: 9.344000 sec.
T50 in the 50-300 keV band: 3.520000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 560.000 -4.528 555.472
T90 552.000 -2.528 549.472
T50 521.000 3.472 524.472
Peak 1.000 2.472 3.472
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
263.1499 +29.8212 0.0275 19.1 39.9 0.5245 7.0 TRIG_00231702
------------------------------------------
Foreground time interval of the image:
-4.528 39.477 (delta_t = 44.005 [sec])
Background time interval of the image:
-226.523 -4.528 (delta_t = 221.995 [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 -4.528 sec. to 555.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83422 ( -0.418379 0.455204 )
Norm@50keV : 1.655327E-04 ( -4.631434E-05 4.367926E-05) )
------------------------------------------------------------
Chi-Squared = 49.66277 using 59 PHA bins.
Reduced chi-squared = 0.8712767 for 57 degrees of freedom
Null hypothesis probability = 0.744
Photon flux (15-150 keV) in 560.0 sec: 2.311970E-02 ( -0.0050231 0.00502359 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.52046e-07 ( -2.27937e-07 2.40834e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.528 sec. to 555.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53598 ( )
Epeak [keV] : 68.5565 ( )
Norm@50keV : 2.424957E-04 ( -4.769143E-05 9.113332E-04) )
------------------------------------------------------------
Chi-Squared = 50.00985 using 59 PHA bins.
Reduced chi-squared = 0.8930330 for 56 degrees of freedom
Null hypothesis probability = 0.700
Photon flux (15-150 keV) in 560.0 sec: 2.311193E-02 ( -0.00502156 0.00502204 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.52449e-07 ( -2.28374e-07 2.40352e-07 ) ergs/cm2
Band function
Time interval is from -4.528 sec. to 555.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26821 ( -8.73178 4.77208 )
beta : -1.88922 ( -8.11078 0.461356 )
Epeak [keV] : 32.9468 ( -32.8468 607.810 )
Norm@50keV : 4.401450E-04 ( -19.3856 16.1874 )
------------------------------------------------------------
Chi-Squared = 49.50851 using 59 PHA bins.
Reduced chi-squared = 0.9001547 for 55 degrees of freedom
Null hypothesis probability = 0.684
Photon flux (15-150 keV) in 560.0 sec: 2.318673E-02 ( -0.00530088 0.00502117 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.03393e-07 ( -2.17095e-07 1.84654e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.472 sec. to 3.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31610 ( -0.586770 0.578438 )
Norm@50keV : 3.525450E-03 ( -1.045367E-03 1.042983E-03) )
------------------------------------------------------------
Chi-Squared = 65.93724 using 59 PHA bins.
Reduced chi-squared = 1.156794 for 57 degrees of freedom
Null hypothesis probability = 0.195
Photon flux (15-150 keV) in 1.000 sec: 0.421873 ( -0.129299 0.130323 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.46788e-08 ( -1.13185e-08 1.16416e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.472 sec. to 3.472 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.10975 ( -1.94826 1.69211 )
Epeak [keV] : 231.821 ( )
Norm@50keV : 4.371439E-03 ( -1.025261E-03 1.073451E-03) )
------------------------------------------------------------
Chi-Squared = 65.98751 using 59 PHA bins.
but latest trial -2.11789 gives Chi-Squared = 4.63604
but latest trial 2.77025 gives Chi-Squared = 0.711197
Reduced chi-squared = 1.178348 for 56 degrees of freedom
Null hypothesis probability = 0.170
Photon flux (15-150 keV) in 1.000 sec: 0.421721 ( -0.129249 0.13028 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49734e-08 ( -1.85328e-08 1.12991e-08 ) ergs/cm2
Band function
Time interval is from 2.472 sec. to 3.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18926 ( -8.81074 6.18926 )
beta : -1.31608 ( -2.12071 0.586750 )
Epeak [keV] : 22.3431 ( -22.2431 9977.66 )
Norm@50keV : 5.609153E-03 ( -5.609153E-03 439.358 )
------------------------------------------------------------
Chi-Squared = 65.93724 using 59 PHA bins.
Reduced chi-squared = 1.198859 for 55 degrees of freedom
Null hypothesis probability = 0.148
Photon flux (15-150 keV) in 1.000 sec: 0.421702 ( -0.129734 0.130289 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.46838e-08 ( -1.24061e-08 1.16233e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 07:30:42 EST 2008