batgrbproduct Analysis for Trigger=147230
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 Jan 7 17:54:14 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger147230/SDC
======================================================================
Trigger: 00147230 Segment: 000
BAT Trigger Time: 143759968 [s; MET]
Trigger Stop: 143760064 [s; MET]
UTC: 2005-07-22T21:19:28.364640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 298.921730545529 Dec: 32.0869226461493 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.33
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.33
Flight Position: [ source = BAT ]
RA: 298.921730545529 Dec: 32.0869226461493 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 298.927464402848 Dec: 32.0804043135879 [deg; J2000]
{ 19h 55m 42.6s , +32d 04' 49.5" }
+/- 2.19568093222435 [arcmin] (estimated 90% radius based on SNR)
+/- 1.24021038159758 [arcmin] (formal 1-sigma fit error)
SNR: 9.88922678730996
RA = 19h 55m 42.6s (298.927464 deg.)
Dec = 32d 4' 49" (32.080404 deg.)
Angular difference between Flight and Ground position is 0.487775 arcmin
Partial Coding Fraction: 0.4179688 [ including projection effects ]
Duration
T90: 96 +/-
Measured from: 0
to: 96 [s; relative to TRIGTIME]
T50: 96 +/-
Measured from: 0
to: 96 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 96 second)
Measured from: 0
to: 96 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 96 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.728986 0.332540 0.189564 0.034680
0.072339 0.073152 0.064267 0.059572 [error]
Peak 0.728986 0.332540 0.189564 0.034680
0.072339 0.073152 0.064267 0.059572 [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 2.37e-07 1.84e-07 9.63e-08 7.27e-08 5.51e-07 5.93e-07 erg/cm2
Error 4.33e-08 4.31e-08 4.83e-08 6.84e-08 1.19e-07 1.55e-07 erg/cm2
Peak flux Power-law 8.20e-02 3.59e-02 9.37e-03 3.02e-03 1.29e-01 1.30e-01 ph/cm2/s
Error 1.54e-02 7.96e-03 4.55e-03 3.24e-03 2.08e-02 2.12e-02 ph/cm2/s
Fluence Cutoff-PL 2.37e-07 1.84e-07 9.62e-08 7.20e-08 5.51e-07 5.91e-07 erg/cm2
Error 4.33e-08 4.31e-08 4.83e-08 6.77e-08 1.19e-07 1.82e-07 erg/cm2
Peak flux Cutoff-PL 8.20e-02 3.59e-02 9.35e-03 2.99e-03 1.29e-01 1.30e-01 ph/cm2/s
Error 1.54e-02 7.97e-03 4.54e-03 3.21e-03 2.08e-02 2.12e-02 ph/cm2/s
Fluence Band 2.31e-07 1.88e-07 1.03e-07 7.94e-08 5.52e-07 5.90e-07 erg/cm2
Error 3.77e-08 3.40e-08 1.08e-07 1.03e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 8.54e-02 3.56e-02 7.48e-03 1.87e-03 1.30e-01 1.31e-01 ph/cm2/s
Error 1.64e-02 8.18e-03 3.82e-03 1.35e-03 2.08e-02 2.12e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.937 0.452 - - 4.91e-04 1.83e-04 67.142 57
CPL 1.833 0.000 3.9 10.4 3.33e-03 5.19e+00 68.408 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.937 0.452 - - 4.91e-04 1.83e-04 67.142 57
CPL 1.833 0.000 3.9 0.0 3.33e-03 1.49e-03 68.408 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 96.000 0.000 96.000
T90 96.000 0.000 96.000
T50 96.000 0.000 96.000
Peak 96.000 0.000 96.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
298.9275 +32.0804 0.0198 32.7 138.0 1.4330 9.9 TRIG_00147230
------------------------------------------
Foreground time interval of the image:
0.000 96.000 (delta_t = 96.000 [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 0.000 sec. to 96.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.93692 ( -0.418541 0.485356 )
Norm@50keV : 4.911955E-04 ( -1.757581E-04 1.902994E-04) )
------------------------------------------------------------
Chi-Squared = 67.14192 using 59 PHA bins.
Reduced chi-squared = 1.177928 for 57 degrees of freedom
Null hypothesis probability = 0.168
Photon flux (15-150 keV) in 96.00 sec: 0.129075 ( -0.0208 0.020823 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50739e-07 ( -1.14509e-07 1.24318e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 96.000 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.83290 ( )
Epeak [keV] : 3.86280 ( -1.80936 18.9333 )
Norm@50keV : 3.334878E-03 ( -1.387370E-03 10.3818 )
------------------------------------------------------------
Chi-Squared = 68.40784 using 59 PHA bins.
but latest trial -1.57247 gives Chi-Squared = 84.8031
but latest trial -3.00339 gives Chi-Squared = 74.3126
Reduced chi-squared = 1.221568 for 56 degrees of freedom
Null hypothesis probability = 0.124
Photon flux (15-150 keV) in 96.00 sec: 0.129014 ( -0.020791 0.020816 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50715e-07 ( -1.14437e-07 1.24144e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 96.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28336 ( -8.71664 6.28336 )
beta : -3.16205 ( -6.83795 0.617171 )
Epeak [keV] : 12.0647 ( -11.9647 24.0120 )
Norm@50keV : 7.545712E-03 ( -193.075 1228.88 )
------------------------------------------------------------
Chi-Squared = 67.00931 using 59 PHA bins.
Reduced chi-squared = 1.218351 for 55 degrees of freedom
Null hypothesis probability = 0.129
Photon flux (15-150 keV) in 96.00 sec: 0.129704 ( -0.021034 0.020568 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52268e-07 ( -8.80954e-08 1.27829e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 96.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.93692 ( -0.418541 0.485356 )
Norm@50keV : 4.911955E-04 ( -1.757581E-04 1.902994E-04) )
------------------------------------------------------------
Chi-Squared = 67.14192 using 59 PHA bins.
Reduced chi-squared = 1.177928 for 57 degrees of freedom
Null hypothesis probability = 0.168
Photon flux (15-150 keV) in 96.00 sec: 0.129075 ( -0.0208 0.020823 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50739e-07 ( -1.14509e-07 1.24318e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 96.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83290 ( )
Epeak [keV] : 3.86280 ( )
Norm@50keV : 3.334878E-03 ( -1.107707E-03 1.877306E-03) )
------------------------------------------------------------
Chi-Squared = 68.40784 using 59 PHA bins.
but latest trial -1.57247 gives Chi-Squared = 84.8031
Reduced chi-squared = 1.221568 for 56 degrees of freedom
Null hypothesis probability = 0.124
Photon flux (15-150 keV) in 96.00 sec: 0.129014 ( -0.020791 0.020816 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50715e-07 ( -1.14437e-07 1.24144e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 96.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28336 ( -8.71664 6.28336 )
beta : -3.16205 ( -6.83795 0.617171 )
Epeak [keV] : 12.0647 ( -11.9647 24.0120 )
Norm@50keV : 7.545712E-03 ( -193.075 1228.88 )
------------------------------------------------------------
Chi-Squared = 67.00931 using 59 PHA bins.
Reduced chi-squared = 1.218351 for 55 degrees of freedom
Null hypothesis probability = 0.129
Photon flux (15-150 keV) in 96.00 sec: 0.129704 ( -0.021034 0.020568 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52268e-07 ( -8.80954e-08 1.27829e-07 ) ergs/cm2
Plot creation:
Mon Jan 7 18:02:42 EST 2008