batgrbproduct analysis for trigger=352108

batgrbproduct Analysis for Trigger=352108

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): Sun Jan 19 16:46:19 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger352108
======================================================================

  Trigger: 00352108      Segment: 000

  BAT Trigger Time: 264055514.268   [s; MET]
      Trigger Stop: 264055514.3   [s; MET]
               UTC: 2009-05-15T04:45:09.525600    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 164.170933861596   Dec: 14.4560193879202  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.79
     Image Trigger?:     NO
     Rate S/N Ratio:     38.3927076409049  [ if not an image trigger ]
     Image S/N Ratio:    9.79

  Flight Position:   [ source = BAT ]
    RA: 164.170933861596   Dec: 14.4560193879202  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 164.164418927944   Dec: 14.4658259660496  [deg; J2000]  
        { 10h 56m 39.5s , +14d 27' 57.0" }
         +/- 2.03775967718021 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.05812041502137 [arcmin] (formal 1-sigma fit error)
    SNR: 11.0019910723503
 
  Angular difference between Flight and Ground position is 0.699628 arcmin
 
  Partial Coding Fraction: 0.8671875    [ including projection effects ]

  Duration
     T90: 0.0360000133514404 +/- 0.0164924197847099
        Measured from: 0.00799998641014099
                   to: 0.0439999997615814     [s; relative to TRIGTIME]
     T50: 0.0160000026226044 +/- 0.00894426338008669
        Measured from: 0.0119999945163727
                   to: 0.0279999971389771     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.466000020503998     
                   to: 0.533999979496002     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.00799998641014099     
                   to: 0.0559999942779541     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.009441   0.015846   0.012522   0.003094
           0.001881   0.002204   0.001982   0.001368 [error]
 Peak      0.009261   0.012798   0.014347  -0.003497
           0.005589   0.005669   0.005274   0.004272 [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 2.71e-09 5.27e-09 7.93e-09 2.59e-08 2.23e-08 4.18e-08   erg/cm2
              Error 6.86e-10 8.98e-10 1.55e-09 9.95e-09 3.92e-09 1.13e-08   erg/cm2
Peak flux Power-law 6.66e-02 8.94e-02 8.82e-02 1.57e-01 2.96e-01 4.01e-01   ph/cm2/s
              Error 5.63e-02 4.76e-02 4.02e-02 1.87e-01 1.29e-01 1.87e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.16e-09 6.08e-09 9.30e-09 7.70e-09 2.21e-08 2.52e-08   erg/cm2
              Error 8.11e-10 1.16e-09 2.03e-09 -------- 4.05e-09 8.89e-09   erg/cm2
Peak flux Cutoff-PL 5.59e-02 9.28e-02 9.53e-02 8.34e-02 2.87e-01 3.27e-01   ph/cm2/s
              Error 6.45e-02 7.45e-02 4.92e-02 1.47e-01 1.32e-01 2.09e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band 5.62e-02 9.26e-02 9.51e-02 8.54e-02 2.88e-01 3.30e-01   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    1.409    0.236    -      -           4.82e-02 7.88e-03   44.740 57
CPL   0.151    1.137      79.8   56.6      1.96e-01 3.78e-01   39.990 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.019    0.789    -      -           2.56e-03 1.11e-03   56.440 57
CPL   0.333    2.374     137.8    0.0      5.22e-03 7.71e-01   56.270 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    0.048    0.008    0.056
T90     0.036    0.008    0.044
T50     0.016    0.012    0.028
Peak    1.000   -0.466    0.534

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
  164.1644    14.4658   0.0175    21.9041    20.5417         0.0421650     11.002 TRIG_00352108                 
 
Foreground time interval of the image:
  0.008   0.056 (delta_t =   0.048 [sec])
Background time interval of the image:
-100.167   0.008 (delta_t = 100.175 [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 0.032000

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 0.032000

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 0.032000

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    0.008 sec. to    0.056 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.40896     ( -0.233253   0.237794 )
Norm@50keV  : 4.81823E-02    ( -0.00788995   0.00787016 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.74 using 59 PHA bins.
# Reduced chi-squared =         0.7850 for     57 degrees of freedom 
# Null hypothesis probability =   8.807372e-01
 
Photon flux (15-150 keV)    in 0.048 sec: 5.87977 ( -0.969472  0.97051 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.23058e-08 ( -3.9144e-09  3.93439e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.008 sec. to    0.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.151045     ( -1.27295   1.00202 )
Epeak [keV] : 79.7569      ( -19.3128 93.9538 )
Norm@50keV  : 0.195515    ( -0.195515   0.561146 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.99 using 59 PHA bins.
# Reduced chi-squared =         0.7141 for     56 degrees of freedom 
# Null hypothesis probability =   9.476776e-01
 
Photon flux (15-150 keV)    in 0.048 sec: 5.83826 ( -0.97627  0.97619 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.21476e-08 ( -4.04899e-09  4.04741e-09 ) ergs/cm2

Band function

Time interval is from    0.008 sec. to    0.056 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.150804   ( -0.698138   1.75928 )
beta        : -10.0000    ( 10   20 )
Epeak [keV] : 79.7378      ( -17.5441 93.7608 )
Norm@50keV   : 0.195585    ( -0.195584   0.559857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.99 using 59 PHA bins.
# Reduced chi-squared =         0.7270 for     55 degrees of freedom 
# Null hypothesis probability =   9.360115e-01
 
Photon flux (15-150 keV)    in 0.048 sec: 5.89963 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 17.0867  (-2.91807  3.42002)
R^2/D10^2   : 0.486471  (-0.229061   0.432742)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.06 using 59 PHA bins.
# Reduced chi-squared =         0.7729 for     57 degrees of freedom 
# Null hypothesis probability =   8.952295e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.386e-09   4.224e-10
25- 50  6.159e-09   1.534e-09
50-150  1.286e-08   3.672e-09
15-150  2.041e-08   4.610e-09

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 24.6940       (-3.98479     3.98463)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.91 using 59 PHA bins.
# Reduced chi-squared =         0.7704 for     57 degrees of freedom 
# Null hypothesis probability =   8.981224e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.952e-09   1.711e-09
25- 50  5.679e-09   3.247e-09
50-150  1.246e-08   7.082e-09
15-150  2.109e-08   1.192e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.45051        (-5.59797      59.9258)
R1^2/D10^2  : 3.30727        (-2.81397      2106.36)
kT2 [keV]   : 22.3160        (-5.81108      45.4137)
R2^2/D10^2  : 0.156672    (-0.154113   0.366037)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.64 using 59 PHA bins.
# Reduced chi-squared =         0.7208 for     55 degrees of freedom 
# Null hypothesis probability =   9.409545e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.192e-09   1.317e-09
25- 50  5.988e-09   3.156e-09
50-150  1.414e-08   8.443e-09
15-150  2.232e-08   1.171e-08

Peak spectrum fit

Power-law model

Time interval is from   -0.466 sec. to    0.534 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.01852     ( -0.838218   0.738818 )
Norm@50keV  : 2.56406E-03    ( -0.00112072   0.00109195 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.44 using 59 PHA bins.
# Reduced chi-squared =         0.9903 for     57 degrees of freedom 
# Null hypothesis probability =   4.958786e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.295544 ( -0.128098  0.129953 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.75474e-08 ( -1.23019e-08  1.26191e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.466 sec. to    0.534 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.332636     ( -5.08082   -0.33261 )
Epeak [keV] : 137.761      ( -137.781 -137.781 )
Norm@50keV  : 5.21789E-03    ( -0.00521746   1.53583 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.27 using 59 PHA bins.
# Reduced chi-squared =          1.005 for     56 degrees of freedom 
# Null hypothesis probability =   4.649157e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.287484 ( -0.130915  0.133463 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.66062e-08 ( -2.66062e-08  1.3164e-08 ) ergs/cm2

Band function

Time interval is from   -0.466 sec. to    0.534 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 3.12782   ( -8.45412   3.68717 )
beta        : -1.47061    ( 9.37142   9.37142 )
Epeak [keV] : 50.3099      ( -89.9021 -142.403 )
Norm@50keV   : 0.495649    ( -0.506784   3.68231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.01 using 59 PHA bins.
# Reduced chi-squared =          1.018 for     55 degrees of freedom 
# Null hypothesis probability =   4.365569e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.287884 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 21.4705  (-9.78173  23.99)
R^2/D10^2   : 1.14306E-02  (-0.011407   0.0703978)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.90 using 59 PHA bins.
# Reduced chi-squared =         0.9982 for     57 degrees of freedom 
# Null hypothesis probability =   4.788577e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.859e-10   6.495e-10
25- 50  5.138e-09   3.291e-09
50-150  1.768e-08   1.240e-08
15-150  2.380e-08   1.576e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-199.363      -199.363)
Norm        : 1.21592       (-0.53597     0.535987)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.82 using 59 PHA bins.
# Reduced chi-squared =          1.014 for     57 degrees of freedom 
# Null hypothesis probability =   4.446698e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.028e-09   1.994e-09
25- 50  5.824e-09   3.856e-09
50-150  1.277e-08   8.615e-09
15-150  2.163e-08   1.404e-08

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 10.6158        (-9.62107      -9.62107)
R1^2/D10^2  : 6.20469E-02        (      )
kT2 [keV]   : 38.6153        (-38.3993      -38.3993)
R2^2/D10^2  : 1.40557E-03    (-0.00147317   0.0565995)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.11 using 59 PHA bins.
#Fit statistic : Chi-Squared =          56.07 using 59 PHA bins.
# Reduced chi-squared =          1.020 for     55 degrees of freedom 
# Reduced chi-squared =          1.019 for     55 degrees of freedom 
# Null hypothesis probability =   4.328743e-01
# Null hypothesis probability =   4.344790e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.745e-09   1.183e-09
25- 50  5.706e-09   3.843e-09
50-150  1.919e-08   1.115e-08
15-150  2.664e-08   1.585e-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: 1.40896     ( -0.233253   0.237794 )
Norm@50keV  : 4.81823E-02    ( -0.00788995   0.00787016 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.74 using 59 PHA bins.
# Reduced chi-squared =         0.7850 for     57 degrees of freedom 
# Null hypothesis probability =   8.807372e-01
 
Photon flux (15-150 keV)    in 0.048 sec: 5.87977 ( -0.969472  0.97051 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.23058e-08 ( -3.9144e-09  3.93439e-09 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.151045     ( -1.27295   1.00202 )
Epeak [keV] : 79.7569      ( -19.3128 93.9538 )
Norm@50keV  : 0.195515    ( -0.195515   0.561146 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.99 using 59 PHA bins.
# Reduced chi-squared =         0.7141 for     56 degrees of freedom 
# Null hypothesis probability =   9.476776e-01
 
Photon flux (15-150 keV)    in 0.048 sec: 5.83826 ( -0.97627  0.97619 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.21476e-08 ( -4.04899e-09  4.04741e-09 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.150804   ( -0.698138   1.75928 )
beta        : -10.0000    ( 10   0 )
Epeak [keV] : 79.7378      ( -17.5441 93.7608 )
Norm@50keV   : 0.195585    ( -0.195584   0.559857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.99 using 59 PHA bins.
# Reduced chi-squared =         0.7270 for     55 degrees of freedom 
# Null hypothesis probability =   9.360115e-01
 
Photon flux (15-150 keV)    in 0.048 sec: 5.89963 (    ) 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)  = 5.27e-09
S(50-100 keV) = 7.93e-09

T90 vs. Hardness ratio plot

T90                                   = 0.0360000133514404 sec.
Hardness ratio (energy fluence ratio) = 1.50474

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.67842
Count Ratio (50-100 keV) / (15-25 keV) = 1.32634

Mask shadow pattern

IMX = 3.765145791083049E-01, IMY = -1.410852250382248E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000

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:
-100.167400 0.008000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5520 -40.5878    1.5  42.3  164.5   1.3653   7.6    2.3	Vela X-1                      
117.9707 -50.2739    2.7  56.5  173.3   2.6944   4.2 ------	UNKNOWN                       
123.7540 -29.7594    2.5  37.5 -174.1   0.6076   4.7 ------	UNKNOWN

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

Time interval of the image:
0.008000 0.056000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5135 -40.6185    5.7  42.4  164.5  -0.0122  -2.0    3.9	Vela X-1                      
155.7681 -22.0505    2.7  23.9  131.4   0.0181   4.3 ------	UNKNOWN                       
164.1644  14.4658    1.1  21.9   20.5   0.0422  11.0 ------	UNKNOWN                       
116.2102 -34.5550    2.5  45.4 -172.1   0.0255   4.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
52.832600 962.783500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
210.7524  43.3167    2.3  49.0   20.0   8.3299   5.0 ------	UNKNOWN                       
164.4606 -26.5279    2.6  41.0  155.1   4.2118   4.5 ------	UNKNOWN                       
190.7676  46.6979    2.9  39.1    4.7   2.6279   4.0 ------	UNKNOWN                       
171.9713  51.2562    2.8  37.3  -16.4   2.3165   4.2 ------	UNKNOWN                       
131.2189  -1.1523    4.4  36.2 -137.3   1.7203   2.7 ------	UNKNOWN                       
129.0817  52.3974    3.2  47.0  -53.1   7.9407   3.6 ------	UNKNOWN

Plot creation:
Sun May 31 04:05:00 EDT 2015