batgrbproduct analysis for trigger=302728

batgrbproduct Analysis for Trigger=302728

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done using the HEASARC data.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Mon Jan 20 04:42:51 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger302728
======================================================================

  Trigger: 00302728      Segment: 000

  BAT Trigger Time: 224112624   [s; MET]
      Trigger Stop: 224112688   [s; MET]
               UTC: 2008-02-07T21:30:21.441560    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 207.513016835087   Dec: 7.5139985942329  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    15.83
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    15.83

  Flight Position:   [ source = BAT ]
    RA: 207.513016835087   Dec: 7.5139985942329  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 207.515129773953   Dec: 7.49224929255474  [deg; J2000]  
        { 13h 50m 03.6s , +07d 29' 32.1" }
         +/- 1.14950852327648 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.394970094257361 [arcmin] (formal 1-sigma fit error)
    SNR: 24.9271361631863
 
  Angular difference between Flight and Ground position is 1.310997 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 292.460000008345 +/- 7.98527645796442
        Measured from: 30.7840000092983
                   to: 323.244000017643     [s; relative to TRIGTIME]
     T50: 111.840000003576 +/- 19.6082656987265
        Measured from: 77.0040000081062
                   to: 188.844000011683     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 330.33599999547     
                   to: 331.33599999547     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 5.15999999642372     
                   to: 332.891999989748     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.077512   4.053600   2.929785   0.617283
           0.095627   0.099712   0.087707   0.074592 [error]
 Peak      0.025363   0.047041   0.040416   0.022408
           0.011917   0.012595   0.011467   0.008859 [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 9.19e-07 1.63e-06 2.21e-06 6.17e-06 6.39e-06 1.09e-05   erg/cm2
              Error 5.37e-08 5.49e-08 8.82e-08 5.56e-07 2.11e-07 6.09e-07   erg/cm2
Peak flux Power-law 3.42e-01 3.61e-01 2.71e-01 3.28e-01 1.10e+00 1.30e+00   ph/cm2/s
              Error 1.76e-01 1.17e-01 8.77e-02 2.20e-01 3.28e-01 3.67e-01   ph/cm2/s
 
Fluence   Cutoff-PL 8.60e-07 1.67e-06 2.25e-06 3.96e-06 6.23e-06 8.74e-06   erg/cm2
              Error 6.76e-08 6.18e-08 9.55e-08 1.26e-06 2.43e-07 1.28e-06   erg/cm2
Peak flux Cutoff-PL 3.12e-01 3.75e-01 2.85e-01 2.17e-01 1.08e+00 1.19e+00   ph/cm2/s
              Error 2.05e-01 1.34e-01 1.06e-01 2.62e-01 3.35e-01 4.35e-01   ph/cm2/s
 
Fluence        Band 8.32e-07 1.68e-06 2.19e-06 4.58e-06 6.25e-06 1.02e-05   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.561    0.058    -      -           2.08e-03 6.40e-05   63.510 57
CPL   1.246    0.237     124.6  106.7      2.94e-03 7.65e-04   57.990 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.417    0.483    -      -           8.99e-03 2.52e-03   42.660 57
CPL   0.989    2.062     127.4    0.0      1.44e-02 1.20e-01   42.500 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: 261.504000 sec.
T50 in the 50-300 keV band: 91.776000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  327.732    5.160  332.892
T90   292.460   30.784  323.244
T50   111.840   77.004  188.844
Peak    1.000  330.336  331.336

Click here for the BAT GCN circular template

Special notes of this burst

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  207.5151     7.4922   0.0077    10.0972    -1.6013         2.4510182     24.927 TRIG_00302728                 
 
Foreground time interval of the image:
  5.160  73.901 (delta_t =  68.741 [sec])
Background time interval of the image:
-132.499   5.160 (delta_t = 137.659 [sec])

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
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

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

Spectra

Notes:

1) The fitting includes the systematic errors.
2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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 average DRM

Power-law model

Time interval is from    5.160 sec. to  332.892 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.56063     ( -0.0580422   0.0581782 )
Norm@50keV  : 2.07582E-03    ( -6.40214e-05   6.39756e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.51 using 59 PHA bins.
# Reduced chi-squared =          1.114 for     57 degrees of freedom 
# Null hypothesis probability =   2.579988e-01
 
Photon flux (15-150 keV)    in 327.7 sec: 0.263602 ( -0.00865568  0.00867797 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.39434e-06 ( -2.1087e-07  2.11436e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from    5.160 sec. to  332.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24559     ( -0.243782   0.230913 )
Epeak [keV] : 124.610      ( -32.9227 180.416 )
Norm@50keV  : 2.93960E-03    ( -0.000645791   0.000883942 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.99 using 59 PHA bins.
# Reduced chi-squared =          1.035 for     56 degrees of freedom 
# Null hypothesis probability =   4.019365e-01
 
Photon flux (15-150 keV)    in 327.7 sec: 0.257646 ( -0.009587  0.009614 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.23338e-06 ( -2.43186e-07  2.42203e-07 ) ergs/cm2

Band function

Time interval is from    5.160 sec. to  332.892 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.14532   ( -0.319112   3.40896 )
beta        : -1.77411    ( 1.77261   0.202818 )
Epeak [keV] : 99.4381      ( -71.2399 175.15 )
Norm@50keV   : 3.35658E-03    ( -0.00102316   0.00714598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.76 using 59 PHA bins.
# Reduced chi-squared =          1.050 for     55 degrees of freedom 
# Null hypothesis probability =   3.737917e-01
 
Photon flux (15-150 keV)    in 327.7 sec: 0.256978 ( 6.74302  -0.009748 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.2537e-06 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 15.3509  (  )
R^2/D10^2   : 2.61594E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         256.70 using 59 PHA bins.
# Reduced chi-squared =         4.5036 for     57 degrees of freedom 
# Null hypothesis probability =   3.831207e-27
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.212e-07   2.409e-08
25- 50  1.709e-06   7.046e-08
50-150  2.769e-06   1.742e-07
15-150  4.899e-06   1.819e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 1.06468       (-0.0324351     0.0324351)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.05 using 59 PHA bins.
# Reduced chi-squared =          1.019 for     57 degrees of freedom 
# Null hypothesis probability =   4.362211e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.696e-07   2.966e-08
25- 50  1.673e-06   5.882e-08
50-150  3.668e-06   1.180e-07
15-150  6.210e-06   2.081e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.20254        (-0.856785      0.936096)
R1^2/D10^2  : 0.238153        (-0.0781087      0.131177)
kT2 [keV]   : 25.6346        (-2.73191      3.81611)
R2^2/D10^2  : 3.40113E-03    (-0.00136005   0.00181373)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.22 using 59 PHA bins.
# Reduced chi-squared =          1.131 for     55 degrees of freedom 
# Null hypothesis probability =   2.347913e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.948e-07   8.274e-08
25- 50  1.689e-06   1.080e-07
50-150  3.678e-06   3.887e-07
15-150  6.162e-06   5.145e-07

Peak spectrum fit

Power-law model

Time interval is from  330.336 sec. to  331.336 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.41749     ( -0.485512   0.480682 )
Norm@50keV  : 8.99247E-03    ( -0.0025251   0.00252489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.66 using 59 PHA bins.
# Reduced chi-squared =         0.7484 for     57 degrees of freedom 
# Null hypothesis probability =   9.210333e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.09967 ( -0.326164  0.329109 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.65869e-08 ( -2.56351e-08  2.58598e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  330.336 sec. to  331.336 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.988934     ( -2.66714   1.45598 )
Epeak [keV] : 127.383      ( -127.396 -127.396 )
Norm@50keV  : 1.44246E-02    ( -0.00782789   0.231688 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.50 using 59 PHA bins.
# Reduced chi-squared =         0.7590 for     56 degrees of freedom 
# Null hypothesis probability =   9.083438e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.08315 ( -0.334334  0.3362 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.51769e-08 ( -2.74174e-08  2.66461e-08 ) ergs/cm2

Band function

Time interval is from  330.336 sec. to  331.336 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.10891   ( 0.775158   0.775158 )
beta        : -1.55509    ( 1.70651   0.751225 )
Epeak [keV] : 29.4786      ( -89.2371 -89.2371 )
Norm@50keV   : 83.1287    ( -83.2386   94.776 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.12 using 59 PHA bins.
# Reduced chi-squared =         0.7658 for     55 degrees of freedom 
# Null hypothesis probability =   8.988564e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.48713e-08 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 16.9785  (-5.20796  7.96643)
R^2/D10^2   : 8.42341E-02  (-0.0839803   0.216585)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.94 using 59 PHA bins.
# Reduced chi-squared =         0.7884 for     57 degrees of freedom 
# Null hypothesis probability =   8.763585e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.947e-09   3.131e-09
25- 50  2.187e-08   1.310e-08
50-150  4.499e-08   3.021e-08
15-150  7.180e-08   4.047e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-118.242      -199.363)
Norm        : 4.60589       (-1.2962     1.2964)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.81 using 59 PHA bins.
# Reduced chi-squared =         0.7511 for     57 degrees of freedom 
# Null hypothesis probability =   9.184288e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.147e-08   7.000e-09
25- 50  2.206e-08   1.358e-08
50-150  4.839e-08   2.843e-08
15-150  8.192e-08   4.928e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.28324        (-7.44613      -7.44613)
R1^2/D10^2  : 0.860394        (-0.807151      -0.807151)
kT2 [keV]   : 25.8820        (-27.1877      -27.1877)
R2^2/D10^2  : 1.50458E-02    (-0.0128239   0.115821)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.59 using 59 PHA bins.
# Reduced chi-squared =         0.7743 for     55 degrees of freedom 
# Null hypothesis probability =   8.890731e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.344e-09   5.895e-09
25- 50  2.119e-08   1.167e-08
50-150  5.114e-08   3.295e-08
15-150  8.167e-08   4.570e-08

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.33326     ( -0.0907183   0.0904045 )
Norm@50keV  : 2.32853E-03    ( -0.000118606   0.000118557 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.08 using 59 PHA bins.
# Reduced chi-squared =         0.9312 for     57 degrees of freedom 
# Null hypothesis probability =   6.229082e-01
 
Photon flux (15-150 keV)    in 68.74 sec: 0.279574 ( -0.0146478  0.0146666 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56927e-06 ( -8.88698e-08  8.93104e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.955745     ( -0.380002   0.34841 )
Epeak [keV] : 144.319      ( -47.7329 751.907 )
Norm@50keV  : 3.54954E-03    ( -0.00111733   0.0018029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.62 using 59 PHA bins.
# Reduced chi-squared =         0.8861 for     56 degrees of freedom 
# Null hypothesis probability =   7.134071e-01
 
Photon flux (15-150 keV)    in 68.74 sec: 0.274111 ( -0.015491  0.015474 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.52505e-06 ( -9.88275e-08  9.85732e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.958875   ( -0.345114   0.233569 )
beta        : -7.01254    ( 4.59903   14.599 )
Epeak [keV] : 145.052      ( -108.887 700.9 )
Norm@50keV   : 3.53720E-03    ( -0.000385067   0.000641114 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.62 using 59 PHA bins.
# Reduced chi-squared =         0.9023 for     55 degrees of freedom 
# Null hypothesis probability =   6.794535e-01
 
Photon flux (15-150 keV)    in 68.74 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 1.63e-06
S(50-100 keV) = 2.21e-06

T90 vs. Hardness ratio plot

T90                                   = 292.460000008345 sec.
Hardness ratio (energy fluence ratio) = 1.35583

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.31717
Count Ratio (50-100 keV) / (15-25 keV) = 0.951998

Mask shadow pattern

IMX = 1.780072672979531E-01, IMY = 4.976312632555476E-03

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-132.499410 5.160000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
195.1665 -18.7174    2.3  38.1   20.0   0.9055   5.0 ------	UNKNOWN                       
230.1360  48.8030    2.5  36.5 -152.4   0.7072   4.7 ------	UNKNOWN                       
230.0218  27.7371    2.2  23.6 -117.9   0.6990   5.2 ------	UNKNOWN

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
5.160000 73.900590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
173.9871  14.1515    2.2  31.8   90.4   0.9860   5.3 ------	UNKNOWN                       
207.5151   7.4923    0.5  10.1   -1.6   2.4510  24.9 ------	UNKNOWN                       
242.9278   3.0138    2.1  38.2  -70.0   1.2185   5.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
112.100600 194.900590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4207  35.2741    5.1  51.1 -143.2  -0.7884  -2.2    4.5	Her X-1                       
174.0160  34.5251    3.5  41.0  122.9   1.1335   3.3 ------	UNKNOWN                       
171.3349  -3.9961    2.0  37.9   60.3   1.5004   5.8 ------	UNKNOWN                       
207.5084   7.4818    0.3   0.0  -28.9   3.3205  34.7 ------	UNKNOWN                       
208.5433 -45.3028    2.0  52.8  -14.1   1.5424   5.8 ------	UNKNOWN                       
227.6220 -39.2160    2.3  50.3  -33.5   1.4511   5.1 ------	UNKNOWN                       
248.2060   2.2147    2.4  40.9  -97.9   2.0214   4.9 ------	UNKNOWN

Plot creation:
Sun May 31 08:25:04 EDT 2015