batgrbproduct analysis for trigger=639433

batgrbproduct Analysis for Trigger=639433

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 May 17 23:59:36 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger639433
======================================================================

  Trigger: 00639433      Segment: 000

  BAT Trigger Time: 452046088.768   [s; MET]
      Trigger Stop: 452046090.816   [s; MET]
               UTC: 2015-04-30T00:21:15.254160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 326.490552682698   Dec: -27.9275457785092  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.21
     Image Trigger?:     NO
     Rate S/N Ratio:     53.619026473818  [ if not an image trigger ]
     Image S/N Ratio:    7.21

  Flight Position:   [ source = BAT ]
    RA: 326.490552682698   Dec: -27.9275457785092  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 326.478336224977   Dec: -27.9157234611205  [deg; J2000]  
        { 21h 45m 54.8s , -27d 54' 56.6" }
         +/- 1.53276330908951 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.635985090250733 [arcmin] (formal 1-sigma fit error)
    SNR: 16.5254752244778
 
  Angular difference between Flight and Ground position is 0.960534 arcmin
 
  Partial Coding Fraction: 0.05761719    [ including projection effects ]

  Duration
     T90: 106.879999995232 +/- 7.02755263860171
        Measured from: -8.02399998903275
                   to: 98.8560000061989     [s; relative to TRIGTIME]
     T50: 45.6000000238419 +/- 12.1512600658553
        Measured from: 0.0400000214576721
                   to: 45.6400000452995     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.972000002861023     
                   to: 1.97200000286102     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10.9359999895096     
                   to: 108.695999979973     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.038652   3.303377   3.218708   0.971239
           0.206399   0.222208   0.204792   0.170343 [error]
 Peak      0.147112   0.161659   0.256416   0.068977
           0.030220   0.039259   0.041162   0.029845 [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 7.78e-07 1.55e-06 2.41e-06 8.21e-06 6.73e-06 1.30e-05   erg/cm2
              Error 9.94e-08 1.20e-07 1.97e-07 1.48e-06 4.94e-07 1.60e-06   erg/cm2
Peak flux Power-law 1.28e+00 1.56e+00 1.38e+00 2.09e+00 4.96e+00 6.32e+00   ph/cm2/s
              Error 4.78e-01 3.64e-01 2.97e-01 9.34e-01 1.00e+00 1.28e+00   ph/cm2/s
 
Fluence   Cutoff-PL 7.26e-07 1.60e-06 2.49e-06 5.31e-06 6.62e-06 1.01e-05   erg/cm2
              Error 1.22e-07 1.38e-07 2.31e-07 2.55e-06 5.21e-07 2.21e-06   erg/cm2
Peak flux Cutoff-PL 1.20e+00 1.59e+00 1.43e+00 1.70e+00 4.93e+00 5.92e+00   ph/cm2/s
              Error 5.93e-01 3.92e-01 3.91e-01 1.34e+00 1.02e+00 1.62e+00   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   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    1.366    0.118    -      -           5.78e-03 3.95e-04   48.090 57
CPL   1.035    0.446     158.7  -46.7      8.28e-03 4.28e-03   46.580 56
 
The chi2 of BB fit is -------- which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.181    0.326    -      -           4.23e-02 8.24e-03   54.760 57
CPL   1.045    0.392     422.2    0.0      4.85e-02 1.17e-01   54.680 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: 105.984000 sec.
T50 in the 50-300 keV band: 22.912000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  119.632  -10.936  108.696
T90   106.880   -8.024   98.856
T50    45.600    0.040   45.640
Peak    1.000    0.972    1.972

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
  326.4783   -27.9157   0.0117    48.8758    38.1536         7.2190216     16.525 TRIG_00639433                 
 
Foreground time interval of the image:
-10.936  31.133 (delta_t =  42.069 [sec])
Background time interval of the image:
-239.768 -10.936 (delta_t = 228.832 [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

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)

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  -10.936 sec. to  108.696 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.36624     ( -0.117736   0.117355 )
Norm@50keV  : 5.77871E-03    ( -0.000394839   0.000394813 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.09 using 59 PHA bins.
# Reduced chi-squared =         0.8436 for     57 degrees of freedom 
# Null hypothesis probability =   7.937390e-01
 
Photon flux (15-150 keV)    in 119.6 sec: 0.698537 ( -0.0503644  0.0504855 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.72598e-06 ( -4.93523e-07  4.94943e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -10.936 sec. to  108.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.03463     ( -0.507761   0.384326 )
Epeak [keV] : 158.704      ( -65.3168 -158.705 )
Norm@50keV  : 8.28266E-03    ( -0.00273645   0.00582929 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.58 using 59 PHA bins.
# Reduced chi-squared =         0.8318 for     56 degrees of freedom 
# Null hypothesis probability =   8.110386e-01
 
Photon flux (15-150 keV)    in 119.6 sec: 0.688524 ( -0.052211  0.052263 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.62335e-06 ( -5.227e-07  5.19208e-07 ) ergs/cm2

Band function

Time interval is from  -10.936 sec. to  108.696 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.894803   ( 0.894752   0.894752 )
beta        : -1.58158    ( 1.58329   0.292167 )
Epeak [keV] : 115.624      ( -115.686 -115.686 )
Norm@50keV   : 9.95881E-03    ( -0.00419739   159.482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.41 using 59 PHA bins.
# Reduced chi-squared =         0.8437 for     55 degrees of freedom 
# Null hypothesis probability =   7.887393e-01
 
Photon flux (15-150 keV)    in 119.6 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]    : 17.6287  (-1.47457  1.6534)
R^2/D10^2   : 4.71390E-02  (-0.0125175   0.01663)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          87.89 using 59 PHA bins.
# Reduced chi-squared =          1.542 for     57 degrees of freedom 
# Null hypothesis probability =   5.359446e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.531e-07   4.874e-08
25- 50  1.607e-06   1.656e-07
50-150  3.606e-06   4.234e-07
15-150  5.566e-06   4.652e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 2.92392       (-0.200937     0.20091)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.79 using 59 PHA bins.
# Reduced chi-squared =         0.9612 for     57 degrees of freedom 
# Null hypothesis probability =   5.585203e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.710e-07   6.901e-08
25- 50  1.675e-06   1.692e-07
50-150  3.675e-06   9.514e-07
15-150  6.221e-06   1.319e-06

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.40009        (-1.92964      2.6297)
R1^2/D10^2  : 0.518015        (-0.310086      0.9545)
kT2 [keV]   : 27.6453        (-5.21455      12.0874)
R2^2/D10^2  : 8.28750E-03    (-0.00592925   0.00715275)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.97 using 59 PHA bins.
# Reduced chi-squared =         0.8722 for     55 degrees of freedom 
# Null hypothesis probability =   7.378879e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.998e-07   2.213e-07
25- 50  1.617e-06   4.072e-07
50-150  4.288e-06   1.573e-06
15-150  6.604e-06   1.970e-06

Peak spectrum fit

Power-law model

Time interval is from    0.972 sec. to    1.972 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.18062     ( -0.326713   0.325579 )
Norm@50keV  : 4.23487E-02    ( -0.00824776   0.0082347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.76 using 59 PHA bins.
# Reduced chi-squared =         0.9607 for     57 degrees of freedom 
# Null hypothesis probability =   5.596512e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.95770 ( -1.00169  1.00521 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.32032e-07 ( -8.99753e-08  9.01817e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.972 sec. to    1.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.04462     ( -1.81932   -1.03463 )
Epeak [keV] : 422.168      ( -379.145 -379.145 )
Norm@50keV  : 4.85310E-02    ( -0.0147534   0.219576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.68 using 59 PHA bins.
# Reduced chi-squared =         0.9765 for     56 degrees of freedom 
# Null hypothesis probability =   5.248493e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.92726 ( -1.01321  1.0172 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.32223e-07 ( -9.0678e-08  9.062e-08 ) ergs/cm2

Band function

Time interval is from    0.972 sec. to    1.972 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.919143   ( 0.931093   0.931093 )
beta        : -2.19206    ( 2.09652   2.09652 )
Epeak [keV] : 243.283      ( -243.302 -243.302 )
Norm@50keV   : 5.54427E-02    ( -0.0161552   0.0429998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.67 using 59 PHA bins.
# Reduced chi-squared =         0.9939 for     55 degrees of freedom 
# Null hypothesis probability =   4.873258e-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]    : 21.4049  (-4.29715  5.92766)
R^2/D10^2   : 0.194617  (-0.108112   0.210609)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.90 using 59 PHA bins.
# Reduced chi-squared =          1.033 for     57 degrees of freedom 
# Null hypothesis probability =   4.059092e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.671e-08   6.650e-09
25- 50  8.690e-08   2.478e-08
50-150  2.971e-07   1.035e-07
15-150  4.007e-07   1.279e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 20.5940       (-4.11461     4.11432)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.86 using 59 PHA bins.
# Reduced chi-squared =          1.033 for     57 degrees of freedom 
# Null hypothesis probability =   4.072071e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.128e-08   3.019e-08
25- 50  9.864e-08   5.775e-08
50-150  2.164e-07   1.263e-07
15-150  3.663e-07   2.146e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.47317        (-1.62545      4.03536)
R1^2/D10^2  : 79.5998        (-77.407      4424.4)
kT2 [keV]   : 25.0370        (-5.66929      9.85796)
R2^2/D10^2  : 0.108419    (-0.0718619   0.148999)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.53 using 59 PHA bins.
# Reduced chi-squared =         0.9552 for     55 degrees of freedom 
# Null hypothesis probability =   5.693873e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.677e-08   2.599e-08
25- 50  7.525e-08   3.512e-08
50-150  3.113e-07   1.632e-07
15-150  4.333e-07   2.076e-07

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: 1.24189     ( -0.145899   0.143672 )
Norm@50keV  : 1.13962E-02    ( -0.00098241   0.000979388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.27 using 59 PHA bins.
# Reduced chi-squared =         0.7942 for     57 degrees of freedom 
# Null hypothesis probability =   8.688222e-01
 
Photon flux (15-150 keV)    in 42.07 sec: 1.34607 ( -0.123576  0.124184 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.80852e-06 ( -4.2831e-07  4.29118e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.718886     ( -0.705265   0.574159 )
Epeak [keV] : 141.083      ( -49.8839 -141.083 )
Norm@50keV  : 1.95098E-02    ( -0.00849076   0.0195597 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.15 using 59 PHA bins.
# Reduced chi-squared =         0.7705 for     56 degrees of freedom 
# Null hypothesis probability =   8.957703e-01
 
Photon flux (15-150 keV)    in 42.07 sec: 1.31658 ( -0.12828  0.12867 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.72825e-06 ( -4.49055e-07  4.45101e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.521111   ( 0.49241   0.49241 )
beta        : -1.57995    ( 1.58828   0.396018 )
Epeak [keV] : 108.655      ( -105.976 181.145 )
Norm@50keV   : 2.48981E-02    ( -0.0136455   977103 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.79 using 59 PHA bins.
# Reduced chi-squared =         0.7779 for     55 degrees of freedom 
# Null hypothesis probability =   8.847627e-01
 
Photon flux (15-150 keV)    in 42.07 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)  = 1.55e-06
S(50-100 keV) = 2.41e-06

T90 vs. Hardness ratio plot

T90                                   = 106.879999995232 sec.
Hardness ratio (energy fluence ratio) = 1.55484

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.62037
Count Ratio (50-100 keV) / (15-25 keV) = 1.57884

Mask shadow pattern

IMX = 9.006498952128774E-01, IMY = -7.075603182957515E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

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:
-239.768000 -10.936000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5670  35.2016    1.9  45.4  137.6   2.8098   6.2    1.1	Cyg X-1                       
308.0676  41.0024    7.6  40.8  148.6   0.3908   1.5    3.6	Cyg X-3                       
326.2844  38.3513    4.1  27.7  159.0   0.3685   2.8    5.6	Cyg X-2                       
312.3315  32.3779    2.6  34.4  137.5   0.8922   4.5 ------	UNKNOWN                       
332.7587  73.4968    2.4  57.1 -170.1   2.5164   4.9 ------	UNKNOWN                       
 18.5989  10.3660    3.0  31.9  -67.8   0.6452   3.9 ------	UNKNOWN

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

Time interval of the image:
-10.936000 31.132590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6438  35.2380    3.1  45.4  137.6   1.1054   3.7    3.4	Cyg X-1                       
308.0013  41.0585   14.9  40.9  148.7   0.1460   0.8    8.0	Cyg X-3                       
326.0504  38.3268    5.8  27.9  158.6   0.1939   2.0    5.7	Cyg X-2                       
326.4783 -27.9158    0.8  48.9   38.2   7.2203  14.8 ------	UNKNOWN                       
343.9069  46.0484    2.2  29.2 -169.2   0.4386   5.2 ------	UNKNOWN                       
 29.6265  28.2099    2.6  41.2  -99.2   1.4793   4.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
95.532590 738.232590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
285.1222 -24.9441   10.8  37.0  107.3   1.2024   1.1    4.9	HT1900.1-2455                 
302.3072 -61.9364    2.5  37.6   40.9   3.4307   4.6 ------	UNKNOWN                       
300.9310  10.4151    3.5  45.6  166.0   3.1518   3.3 ------	UNKNOWN                       
324.7028  30.7729    4.8  58.7 -159.3   7.8761   2.4 ------	UNKNOWN

Plot creation:
Thu May 28 12:53:17 EDT 2015