batgrbproduct Analysis for Trigger=215179
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 1 17:48:26 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger215179/GCN5_download_cron
======================================================================
Trigger: 00215179 Segment: 000
BAT Trigger Time: 172303008 [s; MET]
Trigger Stop: 172303072 [s; MET]
UTC: 2006-06-18T05:56:46.737080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 186.899424567237 Dec: -63.180798571259 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 22.33
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 22.33
Flight Position: [ source = BAT ]
RA: 186.899424567237 Dec: -63.180798571259 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 186.911938950988 Dec: -63.1862655465169 [deg; J2000]
{ 12h 27m 38.9s , -63d 11' 10.6" }
+/- 1.35727253616732 [arcmin] (estimated 90% radius based on SNR)
+/- 0.615669060596206 [arcmin] (formal 1-sigma fit error)
SNR: 19.6604750131592
RA = 12h 27m 38.9s (186.911939 deg.)
Dec = -63d 11' 11" (-63.186266 deg.)
Angular difference between Flight and Ground position is 0.471530 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.836354 0.208090 0.010777 0.001265
0.030573 0.028966 0.024680 0.021300 [error]
Peak 0.836354 0.208090 0.010777 0.001265
0.030573 0.028966 0.024680 0.021300 [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 2.05e-07 1.05e-07 3.32e-08 1.35e-08 3.50e-07 3.56e-07 erg/cm2
Error 2.20e-08 1.54e-08 1.01e-08 7.08e-09 3.85e-08 4.07e-08 erg/cm2
Peak flux Power-law 2.09e-01 6.08e-02 9.63e-03 1.75e-03 2.80e-01 2.81e-01 ph/cm2/s
Error 2.28e-02 8.54e-03 2.84e-03 8.72e-04 2.80e-02 2.81e-02 ph/cm2/s
Fluence Cutoff-PL 2.36e-07 8.63e-08 8.65e-10 1.17e-14 3.23e-07 3.23e-07 erg/cm2
Error 2.54e-08 1.65e-08 7.67e-10 1.10e-13 3.07e-08 3.06e-08 erg/cm2
Peak flux Cutoff-PL 2.36e-01 5.41e-02 2.97e-04 2.08e-09 2.90e-01 2.90e-01 ph/cm2/s
Error 2.63e-02 9.04e-03 2.59e-04 1.98e-08 2.82e-02 2.81e-02 ph/cm2/s
Fluence Band 2.10e-07 1.07e-07 1.17e-08 1.86e-10 3.31e-07 3.76e-07 erg/cm2
Error 2.20e-08 1.22e-08 3.42e-09 6.32e-10 3.22e-08 0.00e+00 erg/cm2
Peak flux Band 2.15e-01 6.30e-02 2.87e-03 1.59e-05 2.85e-01 2.83e-01 ph/cm2/s
Error 2.28e-02 8.20e-03 1.72e-03 1.45e-04 2.76e-02 2.75e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.658 0.259 - - 6.08e-04 1.44e-04 88.302 57
CPL -2.498 0.000 16.7 1.1 4.77e+01 4.85e+01 58.669 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.658 0.259 - - 6.08e-04 1.44e-04 88.302 57
CPL -2.498 0.000 16.7 1.1 4.77e+01 4.85e+01 58.669 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
186.9119 -63.1863 0.0098 0.1 -47.6 1.1179 19.7 TRIG_00215179
------------------------------------------
Foreground time interval of the image:
0.000 33.090 (delta_t = 33.090 [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 33.090 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.65774 ( -0.251256 0.266258 )
Norm@50keV : 6.083975E-04 ( -1.362675E-04 1.507383E-04) )
------------------------------------------------------------
Chi-Squared = 88.30168 using 59 PHA bins.
Reduced chi-squared = 1.549152 for 57 degrees of freedom
Null hypothesis probability = 4.934E-03
Photon flux (15-150 keV) in 33.09 sec: 0.280305 ( -0.028014 0.028015 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50221e-07 ( -3.82027e-08 3.88774e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.090 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49818 ( )
Epeak [keV] : 16.7175 ( -1.05795 1.17560 )
Norm@50keV : 47.6728 ( -39.1156 57.9079 )
------------------------------------------------------------
Chi-Squared = 58.66918 using 59 PHA bins.
Reduced chi-squared = 1.047664 for 56 degrees of freedom
Null hypothesis probability = 0.378
Photon flux (15-150 keV) in 33.09 sec: 0.290176 ( -0.028294 0.028178 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22897e-07 ( -3.06662e-08 3.06827e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.090 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60640 ( )
beta : -9.27786 ( )
Epeak [keV] : 10.4302 ( )
Norm@50keV : 6.658596E-03 ( )
------------------------------------------------------------
Chi-Squared = 118.9353 using 59 PHA bins.
Reduced chi-squared = 2.162459 for 55 degrees of freedom
Null hypothesis probability = 1.316E-06
Photon flux (15-150 keV) in 33.09 sec: 0.284718 ( -0.02759 0.027591 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31224e-07 ( -3.223e-08 3.2233e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.090 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.65774 ( -0.251256 0.266258 )
Norm@50keV : 6.083975E-04 ( -1.362675E-04 1.507383E-04) )
------------------------------------------------------------
Chi-Squared = 88.30168 using 59 PHA bins.
Reduced chi-squared = 1.549152 for 57 degrees of freedom
Null hypothesis probability = 4.934E-03
Photon flux (15-150 keV) in 33.09 sec: 0.280305 ( -0.028014 0.028015 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50221e-07 ( -3.82027e-08 3.88774e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.090 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49818 ( )
Epeak [keV] : 16.7175 ( -1.05795 1.17560 )
Norm@50keV : 47.6728 ( -39.1156 57.9079 )
------------------------------------------------------------
Chi-Squared = 58.66918 using 59 PHA bins.
Reduced chi-squared = 1.047664 for 56 degrees of freedom
Null hypothesis probability = 0.378
Photon flux (15-150 keV) in 33.09 sec: 0.290176 ( -0.028294 0.028178 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22897e-07 ( -3.06662e-08 3.06827e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.090 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60640 ( )
beta : -9.27786 ( )
Epeak [keV] : 10.4302 ( )
Norm@50keV : 6.658596E-03 ( )
------------------------------------------------------------
Chi-Squared = 118.9353 using 59 PHA bins.
Reduced chi-squared = 2.162459 for 55 degrees of freedom
Null hypothesis probability = 1.316E-06
Photon flux (15-150 keV) in 33.09 sec: 0.284718 ( -0.02759 0.027591 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31224e-07 ( -3.223e-08 3.2233e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 17:53:45 EST 2008