batgrbproduct analysis for trigger=278693

batgrbproduct Analysis for Trigger=278693

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 10:02:02 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger278693
======================================================================

  Trigger: 00278693      Segment: 000

  BAT Trigger Time: 200122560   [s; MET]
      Trigger Stop: 200122624   [s; MET]
               UTC: 2007-05-06T05:35:58.063600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 347.217597658185   Dec: 10.7283397482321  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.48
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.48

  Flight Position:   [ source = BAT ]
    RA: 347.217597658185   Dec: 10.7283397482321  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 347.219739029459   Dec: 10.7108009152786  [deg; J2000]  
        { 23h 08m 52.7s , +10d 42' 38.9" }
         +/- 2.15721488756149 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.94215629109108 [arcmin] (formal 1-sigma fit error)
    SNR: 10.142097842926
 
  Angular difference between Flight and Ground position is 1.059875 arcmin
 
  Partial Coding Fraction: 0.96875    [ including projection effects ]

  Duration
     T90: 5.99200001358986 +/- 1.40688165181272
        Measured from: 4.17599999904633
                   to: 10.1680000126362     [s; relative to TRIGTIME]
     T50: 2.44400000572205 +/- 0.704556592365783
        Measured from: 5.3120000064373
                   to: 7.75600001215935     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.15599998831749     
                   to: 7.15599998831749     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 3.78400000929832     
                   to: 11.1839999854565     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.126807   0.162877   0.107280   0.004020
           0.013052   0.013905   0.012558   0.012102 [error]
 Peak      0.037965   0.053625   0.027751   0.000949
           0.005103   0.005397   0.004791   0.004463 [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 3.93e-08 6.29e-08 7.59e-08 1.80e-07 2.30e-07 3.58e-07   erg/cm2
              Error 5.62e-09 6.13e-09 1.19e-08 5.64e-08 2.78e-08 6.84e-08   erg/cm2
Peak flux Power-law 3.68e-01 3.33e-01 2.07e-01 1.97e-01 9.91e-01 1.11e+00   ph/cm2/s
              Error 6.54e-02 4.12e-02 3.78e-02 6.81e-02 1.22e-01 1.43e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.58e-08 7.04e-08 7.37e-08 4.20e-08 2.07e-07 2.22e-07   erg/cm2
              Error 6.39e-09 8.62e-09 1.41e-08 6.30e-08 3.12e-08 6.45e-08   erg/cm2
Peak flux Cutoff-PL 3.18e-01 4.01e-01 1.98e-01 3.04e-02 9.44e-01 9.48e-01   ph/cm2/s
              Error 7.40e-02 6.09e-02 5.09e-02 -------- 1.24e-01 1.28e-01   ph/cm2/s
 
Fluence        Band 3.55e-08 6.99e-08 7.40e-08 4.76e-08 2.08e-07 2.28e-07   erg/cm2
              Error 6.30e-09 -------- -------- -------- -------- --------   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    1.728    0.176    -      -           3.36e-03 3.85e-04   85.870 57
CPL   0.768    0.846      55.1   30.2      1.17e-02 1.75e-02   81.090 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.682    0.206    -      -           7.51e-03 1.06e-03   61.190 57
CPL   0.036    1.215      49.2   14.1      6.79e-02 2.32e-01   52.770 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: 8.640000 sec.
T50 in the 50-300 keV band: 3.520000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    7.400    3.784   11.184
T90     5.992    4.176   10.168
T50     2.444    5.312    7.756
Peak    1.000    6.156    7.156

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
  347.2197    10.7108   0.0189    15.3308    21.9860         0.3688070     10.142 TRIG_00278693                 
 
Foreground time interval of the image:
  3.784  11.184 (delta_t =   7.400 [sec])
Background time interval of the image:
 -2.899   3.784 (delta_t =   6.683 [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    3.784 sec. to   11.184 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.72760     ( -0.172489   0.17918 )
Norm@50keV  : 3.35904E-03    ( -0.000388084   0.000381618 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          85.87 using 59 PHA bins.
# Reduced chi-squared =          1.507 for     57 degrees of freedom 
# Null hypothesis probability =   8.015739e-03
 
Photon flux (15-150 keV)    in 7.4 sec: 0.450506 ( -0.0439255  0.0439272 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.29684e-07 ( -2.74697e-08  2.80932e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    3.784 sec. to   11.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.767525     ( -0.92776   0.763957 )
Epeak [keV] : 55.1232      ( -11.291 49.188 )
Norm@50keV  : 1.17079E-02    ( -0.00728107   0.027668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          81.09 using 59 PHA bins.
# Reduced chi-squared =          1.448 for     56 degrees of freedom 
# Null hypothesis probability =   1.584200e-02
 
Photon flux (15-150 keV)    in 7.4 sec: 0.433339 ( -0.045517  0.045698 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07255e-07 ( -3.00492e-08  3.23062e-08 ) ergs/cm2

Band function

Time interval is from    3.784 sec. to   11.184 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.767187   ( -0.701166   0.819769 )
beta        : -10.0000    ( 10   1.77636e-15 )
Epeak [keV] : 55.1109      ( -10.9611 49.1665 )
Norm@50keV   : 1.17127E-02    ( -0.0073062   0.0277639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          81.09 using 59 PHA bins.
# Reduced chi-squared =          1.474 for     55 degrees of freedom 
# Null hypothesis probability =   1.261915e-02
 
Photon flux (15-150 keV)    in 7.4 sec: 0.434668 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07724e-07 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 11.4436  (-1.27515  1.45062)
R^2/D10^2   : 0.132156  (-0.0466967   0.0713675)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          93.89 using 59 PHA bins.
# Reduced chi-squared =          1.647 for     57 degrees of freedom 
# Null hypothesis probability =   1.510788e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.694e-08   4.433e-09
25- 50  8.008e-08   9.494e-09
50-150  6.100e-08   1.453e-08
15-150  1.680e-07   2.220e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 103.945       (-31.9248      67.9572)
Norm        : 1.98966       (-0.24545     0.281372)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          82.26 using 59 PHA bins.
# Reduced chi-squared =          1.443 for     57 degrees of freedom 
# Null hypothesis probability =   1.591530e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.848e-08   5.517e-09
25- 50  6.705e-08   7.892e-09
50-150  1.110e-07   4.762e-08
15-150  2.166e-07   5.347e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.52165        (-2.04448      2.32547)
R1^2/D10^2  : 0.608813        (-0.360131      1.47914)
kT2 [keV]   : 19.1234        (-4.93885      12.6868)
R2^2/D10^2  : 1.41070E-02    (-0.0122233   0.0358069)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          80.15 using 59 PHA bins.
# Reduced chi-squared =          1.457 for     55 degrees of freedom 
# Null hypothesis probability =   1.505525e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.592e-08   1.906e-08
25- 50  6.998e-08   3.385e-08
50-150  1.016e-07   5.641e-08
15-150  2.075e-07   1.102e-07

Peak spectrum fit

Power-law model

Time interval is from    6.156 sec. to    7.156 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.68178     ( -0.202266   0.209863 )
Norm@50keV  : 7.51033E-03    ( -0.00107067   0.00105455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.19 using 59 PHA bins.
# Reduced chi-squared =          1.073 for     57 degrees of freedom 
# Null hypothesis probability =   3.281119e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.991189 ( -0.122407  0.122407 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.96456e-08 ( -1.03548e-08  1.063e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    6.156 sec. to    7.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.59374E-02     ( -1.39354   1.03705 )
Epeak [keV] : 49.2428      ( -8.65718 19.5175 )
Norm@50keV  : 6.78681E-02    ( -0.0680516   0.396268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.77 using 59 PHA bins.
# Reduced chi-squared =         0.9423 for     56 degrees of freedom 
# Null hypothesis probability =   5.980251e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.944015 ( -0.123088  0.124085 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.905e-08 ( -1.03646e-08  1.1662e-08 ) ergs/cm2

Band function

Time interval is from    6.156 sec. to    7.156 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 3.96589   ( -0.868954   1.0993 )
beta        : -2.28162    ( 9.14164   19.1416 )
Epeak [keV] : 32.1919      ( -9.13843 19.9709 )
Norm@50keV   : 48.4734    ( -48.4719   65.2814 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.34 using 59 PHA bins.
# Reduced chi-squared =         0.9152 for     55 degrees of freedom 
# Null hypothesis probability =   6.531542e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) 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]    : 11.2131  (-1.41707  1.66697)
R^2/D10^2   : 0.326651  (-0.130732   0.209396)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.49 using 59 PHA bins.
# Reduced chi-squared =         0.9910 for     57 degrees of freedom 
# Null hypothesis probability =   4.942983e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.612e-09   1.966e-09
25- 50  2.495e-08   4.170e-09
50-150  1.798e-08   5.350e-09
15-150  5.155e-08   8.140e-09

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 111.789       (-40.9773      -110.578)
Norm        : 4.31653       (-0.66437     0.783275)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.87 using 59 PHA bins.
# Reduced chi-squared =         0.9978 for     57 degrees of freedom 
# Null hypothesis probability =   4.797570e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.127e-08   1.901e-09
25- 50  1.991e-08   5.130e-09
50-150  3.427e-08   1.806e-08
15-150  6.545e-08   2.404e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.91248        (-2.87371      2.77704)
R1^2/D10^2  : 0.772357        (-0.42111      1.57656)
kT2 [keV]   : 20.6228        (-15.6436      64.7509)
R2^2/D10^2  : 1.93677E-02    (-0.018929   0.14905)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.07 using 59 PHA bins.
# Reduced chi-squared =         0.9285 for     55 degrees of freedom 
# Null hypothesis probability =   6.255316e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.024e-08   5.710e-09
25- 50  2.286e-08   1.267e-08
50-150  2.899e-08   1.693e-08
15-150  6.209e-08   3.136e-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: 1.72760     ( -0.172489   0.17918 )
Norm@50keV  : 3.35904E-03    ( -0.000388084   0.000381618 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          85.87 using 59 PHA bins.
# Reduced chi-squared =          1.507 for     57 degrees of freedom 
# Null hypothesis probability =   8.015739e-03
 
Photon flux (15-150 keV)    in 7.4 sec: 0.450506 ( -0.0439255  0.0439272 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.29684e-07 ( -2.74697e-08  2.80932e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.767525     ( -0.92776   0.763957 )
Epeak [keV] : 55.1232      ( -11.291 49.188 )
Norm@50keV  : 1.17079E-02    ( -0.00728107   0.027668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          81.09 using 59 PHA bins.
# Reduced chi-squared =          1.448 for     56 degrees of freedom 
# Null hypothesis probability =   1.584200e-02
 
Photon flux (15-150 keV)    in 7.4 sec: 0.433339 ( -0.045517  0.045698 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07255e-07 ( -3.00492e-08  3.23062e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.767187   ( -0.701166   0.819769 )
beta        : -10.0000    ( 10   0 )
Epeak [keV] : 55.1109      ( -10.9611 49.1665 )
Norm@50keV   : 1.17127E-02    ( -0.0073062   0.0277639 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          81.09 using 59 PHA bins.
# Reduced chi-squared =          1.474 for     55 degrees of freedom 
# Null hypothesis probability =   1.261915e-02
 
Photon flux (15-150 keV)    in 7.4 sec: 0.434668 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07724e-07 ( 0  0 ) ergs/cm2

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

S(25-50 keV)  = 6.29e-08
S(50-100 keV) = 7.59e-08

T90 vs. Hardness ratio plot

T90                                   = 5.99200001358986 sec.
Hardness ratio (energy fluence ratio) = 1.20668

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.28445
Count Ratio (50-100 keV) / (15-25 keV) = 0.84601

Mask shadow pattern

IMX = 2.542102395409447E-01, IMY = -1.026354651012632E-01

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:
-2.899410 3.784000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.2713  40.8802    7.8  40.3  124.1  -0.1127  -1.5    8.5	Cyg X-3                       
325.9742  38.4206   20.9  26.5  126.5  -0.0178  -0.6   11.0	Cyg X-2                       
298.6504  53.8694    2.7  49.3  140.3   0.5398   4.2 ------	UNKNOWN

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

Time interval of the image:
3.784000 11.184000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1776  40.8366    8.5  40.4  124.0   0.1581   1.4    7.6	Cyg X-3                       
326.2007  38.4752   12.7  26.4  126.7   0.0457   0.9    9.3	Cyg X-2                       
347.2197  10.7108    1.1  15.3   22.0   0.3688  10.1 ------	UNKNOWN                       
351.7926 -31.8737    2.1  56.9    0.9   1.2450   5.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
113.300590 248.423100
250.000000 963.066800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0079  40.8292   11.5  45.8  150.7   1.2555   1.0    8.7	Cyg X-3                       
326.2732  38.4214    2.9  33.4  162.1   2.3681   4.0    7.7	Cyg X-2                       
332.3388 -27.6095    3.7  41.0   33.0   2.4862   3.1 ------	UNKNOWN                       
328.7742  24.4580    3.0  22.3  143.2   1.6593   3.9 ------	UNKNOWN                       
 28.6356  21.6621    4.8  41.1  -98.1   6.9554   2.4 ------	UNKNOWN

Plot creation:
Sun May 31 10:20:54 EDT 2015