batgrbproduct Analysis for Trigger=153461
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): Tue Jan 8 19:12:48 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger153461/SDC
======================================================================
Trigger: 00153461 Segment: 000
BAT Trigger Time: 147474712 [s; MET]
Trigger Stop: 147474824 [s; MET]
UTC: 2005-09-03T21:11:52.290340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 84.9235186879816 Dec: 20.6606618937871 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.09
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.09
Flight Position: [ source = BAT ]
RA: 84.9235186879816 Dec: 20.6606618937871 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 84.9751416093699 Dec: 20.6461379366199 [deg; J2000]
{ 05h 39m 54.0s , +20d 38' 46.1" }
+/- 1.72162505766376 [arcmin] (estimated 90% radius based on SNR)
+/- 0.966870428107381 [arcmin] (formal 1-sigma fit error)
SNR: 13.9979124466958
RA = 5h 39m 54.0s (84.975142 deg.)
Dec = 20d 38' 46" (20.646138 deg.)
Angular difference between Flight and Ground position is 3.026484 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 112 +/- 35.7770876399966
Measured from: 0
to: 112 [s; relative to TRIGTIME]
T50: 112 +/- 16
Measured from: 0
to: 112 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 112 second)
Measured from: 0
to: 112 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 112 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.310616 0.232471 0.058602 0.030307
0.056601 0.056716 0.050465 0.049262 [error]
Peak 0.310616 0.232471 0.058602 0.030307
0.056601 0.056716 0.050465 0.049262 [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 8.91e-08 8.95e-08 6.31e-08 7.07e-08 2.69e-07 3.12e-07 erg/cm2
Error 2.53e-08 2.82e-08 3.96e-08 9.64e-08 9.40e-08 1.48e-07 erg/cm2
Peak flux Power-law 2.62e-02 1.47e-02 5.17e-03 2.39e-03 4.73e-02 4.84e-02 ph/cm2/s
Error 7.61e-03 4.43e-03 3.15e-03 3.06e-03 1.19e-02 1.25e-02 ph/cm2/s
Fluence Cutoff-PL 9.38e-08 9.47e-08 1.32e-08 8.32e-11 2.02e-07 2.03e-07 erg/cm2
Error 2.82e-08 3.90e-08 5.25e-08 9.09e-08 1.10e-07 1.67e-07 erg/cm2
Peak flux Cutoff-PL 2.70e-02 1.61e-02 1.25e-03 4.36e-06 4.44e-02 4.60e-02 ph/cm2/s
Error 8.32e-03 6.19e-03 4.23e-03 2.90e-03 9.81e-03 1.61e-02 ph/cm2/s
Fluence Band 2.36e-07 1.60e-07 6.66e-08 7.32e-08 2.79e-07 3.41e-07 erg/cm2
Error 3.17e-08 7.83e-08 9.04e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.73e-02 1.57e-02 3.43e-03 8.94e-04 4.69e-02 4.74e-02 ph/cm2/s
Error 8.38e-03 5.18e-03 2.64e-03 2.20e-03 1.16e-02 1.17e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.504 0.595 - - 2.40e-04 1.12e-04 74.422 57
CPL 1.490 0.000 14.4 5000.0 1.29e-03 0.00e+00 74.311 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.504 0.595 - - 2.40e-04 1.12e-04 74.422 57
CPL 1.490 0.000 14.4 5000.0 1.29e-03 0.00e+00 74.311 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 112.000 0.000 112.000
T90 112.000 0.000 112.000
T50 112.000 0.000 112.000
Peak 112.000 0.000 112.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
84.9751 +20.6461 0.0137 14.2 -99.6 1.7125 14.0 TRIG_00153461
------------------------------------------
Foreground time interval of the image:
0.000 112.000 (delta_t = 112.000 [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 112.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50366 ( -0.531453 0.658968 )
Norm@50keV : 2.403404E-04 ( -1.098714E-04 1.137906E-04) )
------------------------------------------------------------
Chi-Squared = 74.42169 using 59 PHA bins.
Reduced chi-squared = 1.305644 for 57 degrees of freedom
Null hypothesis probability = 6.045E-02
Photon flux (15-150 keV) in 112.0 sec: 4.732000E-02 ( -0.0118558 0.0118946 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69497e-07 ( -8.83366e-08 9.96811e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 112.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49042 ( )
Epeak [keV] : 14.3580 ( -23.3847 9976.61 )
Norm@50keV : 1.288648E-03 ( )
------------------------------------------------------------
Chi-Squared = 74.31121 using 59 PHA bins.
Reduced chi-squared = 1.326986 for 56 degrees of freedom
Null hypothesis probability = 5.128E-02
Photon flux (15-150 keV) in 112.0 sec: 4.436023E-02 ( -0.00555136 0.0140643 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0164e-07 ( -5.92077e-08 1.61301e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 112.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48475 ( -8.51525 6.48475 )
beta : -4.89180 ( -7.14341 12.8566 )
Epeak [keV] : 19.1144 ( -15.1777 58.3791 )
Norm@50keV : 1.022812E-03 ( -2.37155 75.2363 )
------------------------------------------------------------
Chi-Squared = 74.65979 using 59 PHA bins.
Reduced chi-squared = 1.357451 for 55 degrees of freedom
Null hypothesis probability = 4.002E-02
Photon flux (15-150 keV) in 112.0 sec: 4.688993E-02 ( -0.0118347 0.0113536 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78528e-07 ( -8.87398e-08 9.20181e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 112.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50366 ( -0.531453 0.658968 )
Norm@50keV : 2.403404E-04 ( -1.098714E-04 1.137906E-04) )
------------------------------------------------------------
Chi-Squared = 74.42169 using 59 PHA bins.
Reduced chi-squared = 1.305644 for 57 degrees of freedom
Null hypothesis probability = 6.045E-02
Photon flux (15-150 keV) in 112.0 sec: 4.732000E-02 ( -0.0118558 0.0118946 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69497e-07 ( -8.83366e-08 9.96811e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 112.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49042 ( )
Epeak [keV] : 14.3580 ( -23.3847 9976.61 )
Norm@50keV : 1.288648E-03 ( )
------------------------------------------------------------
Chi-Squared = 74.31121 using 59 PHA bins.
Reduced chi-squared = 1.326986 for 56 degrees of freedom
Null hypothesis probability = 5.128E-02
Photon flux (15-150 keV) in 112.0 sec: 4.436023E-02 ( -0.00555136 0.0140643 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0164e-07 ( -5.92077e-08 1.61301e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 112.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48475 ( -8.51525 6.48475 )
beta : -4.89180 ( -7.14341 12.8566 )
Epeak [keV] : 19.1144 ( -15.1777 58.3791 )
Norm@50keV : 1.022812E-03 ( -2.37155 75.2363 )
------------------------------------------------------------
Chi-Squared = 74.65979 using 59 PHA bins.
Reduced chi-squared = 1.357451 for 55 degrees of freedom
Null hypothesis probability = 4.002E-02
Photon flux (15-150 keV) in 112.0 sec: 4.688993E-02 ( -0.0118347 0.0113536 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78528e-07 ( -8.87398e-08 9.20181e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 19:29:11 EST 2008