batgrbproduct analysis for trigger=552063

batgrbproduct Analysis for Trigger=552063

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 12 04:52:21 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger552063
======================================================================

  Trigger: 00552063      Segment: 000

  BAT Trigger Time: 386041664.384   [s; MET]
      Trigger Stop: 386041666.432   [s; MET]
               UTC: 2013-03-27T01:47:34.014540    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 91.9916773554106   Dec: 55.7304273950613  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.19
     Image Trigger?:     NO
     Rate S/N Ratio:     8.60232526704263  [ if not an image trigger ]
     Image S/N Ratio:    7.19

  Flight Position:   [ source = BAT ]
    RA: 91.9916773554106   Dec: 55.7304273950613  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 91.9789599524498   Dec: 55.7285079971054  [deg; J2000]  
        { 06h 07m 55.0s , +55d 43' 42.6" }
         +/- 2.17733765792573 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.27578125513632 [arcmin] (formal 1-sigma fit error)
    SNR: 10.0084600524701
 
  Angular difference between Flight and Ground position is 0.444837 arcmin
 
  Partial Coding Fraction: 0.6171875    [ including projection effects ]

  Duration
     T90: 6.37199997901917 +/- 1.40803551100794
        Measured from: -1.89200001955032
                   to: 4.47999995946884     [s; relative to TRIGTIME]
     T50: 2.49199998378754 +/- 1.73239830253822
        Measured from: 0.603999972343445
                   to: 3.09599995613098     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.283999979496002     
                   to: 1.283999979496     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.2960000038147     
                   to: 5.74400001764297     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.167395   0.147101   0.091400  -0.000906
           0.021134   0.022013   0.019053   0.017123 [error]
 Peak      0.042511   0.044535   0.021855  -0.003081
           0.007455   0.008021   0.007022   0.005835 [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 5.80e-08 7.13e-08 6.36e-08 9.80e-08 2.27e-07 2.91e-07   erg/cm2
              Error 1.17e-08 1.10e-08 1.90e-08 5.75e-08 4.26e-08 7.99e-08   erg/cm2
Peak flux Power-law 5.13e-01 3.43e-01 1.49e-01 8.98e-02 1.05e+00 1.10e+00   ph/cm2/s
              Error 1.31e-01 6.94e-02 5.77e-02 6.51e-02 2.02e-01 2.15e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.85e-08 7.11e-08 6.25e-08 9.39e-08 2.25e-07 2.86e-07   erg/cm2
              Error 1.17e-08 1.18e-08 1.47e-08 8.26e-08 4.34e-08 7.48e-08   erg/cm2
Peak flux Cutoff-PL 5.14e-01 3.42e-01 1.48e-01 8.67e-02 1.05e+00 1.09e+00   ph/cm2/s
              Error -------- -------- -------- -------- -------- 2.23e-01   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    2.165    0.315    -      -           3.01e-03 6.47e-04   55.030 57
CPL   2.311    0.000     133.3    0.0      2.49e-03 0.00e+00   54.890 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.198    0.410    -      -           6.35e-03 1.85e-03   39.360 57
CPL   2.284    0.000     136.5    0.0      5.63e-03 0.00e+00   39.330 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    8.040   -2.296    5.744
T90     6.372   -1.892    4.480
T50     2.492    0.604    3.096
Peak    1.000    0.284    1.284

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
   91.9790    55.7285   0.0192    36.3509  -150.6459         0.4060423     10.008 TRIG_00552063                 
 
Foreground time interval of the image:
 -2.296   5.744 (delta_t =   8.040 [sec])
Background time interval of the image:
-89.683  -2.296 (delta_t =  87.387 [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 2.048000

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 2.048000

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 2.048000

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)

The mask-weighted light curves based on cleaned DPHs

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   -2.296 sec. to    5.744 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.16507     ( -0.296776   0.332479 )
Norm@50keV  : 3.01483E-03    ( -0.000662641   0.000632131 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.03 using 59 PHA bins.
# Reduced chi-squared =         0.9655 for     57 degrees of freedom 
# Null hypothesis probability =   5.492533e-01
 
Photon flux (15-150 keV)    in 8.04 sec: 0.490128 ( -0.0717242  0.0717257 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.26842e-07 ( -4.18364e-08  4.33061e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -2.296 sec. to    5.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.31074     (     )
Epeak [keV] : 133.255      (   )
Norm@50keV  : 2.49160E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.89 using 59 PHA bins.
# Reduced chi-squared =         0.9801 for     56 degrees of freedom 
# Null hypothesis probability =   5.169968e-01
 
Photon flux (15-150 keV)    in 8.04 sec: 0.489994 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.25212e-07 ( -4.1759e-08  4.50023e-08 ) ergs/cm2

Band function

Time interval is from   -2.296 sec. to    5.744 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -9.33665   ( 9.33665   9.33665 )
beta        : -2.16507    ( -0.332479   0.296934 )
Epeak [keV] : 1.67962      ( -1.67962 -1.67962 )
Norm@50keV   : 0.409758    ( -0.0900624   0.0859155 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.03 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     55 degrees of freedom 
# Null hypothesis probability =   4.734085e-01
 
Photon flux (15-150 keV)    in 8.04 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]    : 8.62491  (-1.94017  2.35066)
R^2/D10^2   : 0.379958  (-0.374876   0.657582)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.41 using 59 PHA bins.
# Reduced chi-squared =          1.288 for     57 degrees of freedom 
# Null hypothesis probability =   7.057845e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.321e-08   1.332e-08
25- 50  8.582e-08   1.929e-08
50-150  2.869e-08   1.327e-08
15-150  1.577e-07   3.437e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 54.5331       (-20.7012      39.4225)
Norm        : 2.65134       (-0.639902     0.392071)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.58 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     57 degrees of freedom 
# Null hypothesis probability =   4.534174e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.266e-08   1.056e-08
25- 50  7.773e-08   1.464e-08
50-150  8.148e-08   3.385e-08
15-150  2.119e-07   5.411e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.07867        (-1.21262      1.59857)
R1^2/D10^2  : 6.46669        (-4.89958      31.2719)
kT2 [keV]   : 17.3999        (-5.07361      10.6372)
R2^2/D10^2  : 1.96633E-02    (-0.0163137   0.0395639)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.29 using 59 PHA bins.
# Reduced chi-squared =         0.9870 for     55 degrees of freedom 
# Null hypothesis probability =   5.018314e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.161e-08   3.432e-08
25- 50  6.345e-08   3.345e-08
50-150  9.528e-08   5.633e-08
15-150  2.203e-07   1.094e-07

Peak spectrum fit

Power-law model

Time interval is from    0.284 sec. to    1.284 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.19771     ( -0.378384   0.441886 )
Norm@50keV  : 6.34830E-03    ( -0.00189773   0.00180362 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.36 using 59 PHA bins.
# Reduced chi-squared =         0.6905 for     57 degrees of freedom 
# Null hypothesis probability =   9.638948e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.04972 ( -0.201567  0.201588 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.96681e-08 ( -1.46287e-08  1.5376e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.284 sec. to    1.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.28415     (     )
Epeak [keV] : 136.471      (   )
Norm@50keV  : 5.63084E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.33 using 59 PHA bins.
# Reduced chi-squared =         0.7023 for     56 degrees of freedom 
# Null hypothesis probability =   9.555824e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.04944 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.93916e-08 ( -1.56226e-08  1.56605e-08 ) ergs/cm2

Band function

Time interval is from    0.284 sec. to    1.284 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -2.29664   ( 2.29664   2.29664 )
beta        : -2.19771    ( -0.441884   0.378987 )
Epeak [keV] : 9.65406      ( -9.65406 -9.65406 )
Norm@50keV   : 0.862823    ( -0.257928   0.245138 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.36 using 59 PHA bins.
# Reduced chi-squared =         0.7156 for     55 degrees of freedom 
# Null hypothesis probability =   9.448345e-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]    : 7.33778  (-1.74559  2.52586)
R^2/D10^2   : 1.57193  (-1.07749   3.22456)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.10 using 59 PHA bins.
# Reduced chi-squared =         0.8439 for     57 degrees of freedom 
# Null hypothesis probability =   7.932988e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.424e-08   5.815e-09
25- 50  2.133e-08   8.337e-09
50-150  4.180e-09   2.826e-09
15-150  3.975e-08   1.417e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 47.9761       (-21.6955      52.6392)
Norm        : 6.05644       (-1.88131     3.34943)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.74 using 59 PHA bins.
# Reduced chi-squared =         0.7148 for     57 degrees of freedom 
# Null hypothesis probability =   9.488032e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.466e-08   3.856e-09
25- 50  2.075e-08   6.035e-09
50-150  1.936e-08   1.150e-08
15-150  5.477e-08   2.128e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.94425        (-1.95587      2.15745)
R1^2/D10^2  : 6.47201        (-4.91442      53.4032)
kT2 [keV]   : 21.4456        (-10.235      45.5061)
R2^2/D10^2  : 1.72497E-02    (-0.0166574   0.206878)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.11 using 59 PHA bins.
# Reduced chi-squared =         0.7110 for     55 degrees of freedom 
# Null hypothesis probability =   9.481221e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.653e-08   9.470e-09
25- 50  1.729e-08   8.727e-09
50-150  2.692e-08   1.642e-08
15-150  6.074e-08   3.276e-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: 2.16507     ( -0.296776   0.332479 )
Norm@50keV  : 3.01483E-03    ( -0.000662641   0.000632131 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.03 using 59 PHA bins.
# Reduced chi-squared =         0.9655 for     57 degrees of freedom 
# Null hypothesis probability =   5.492533e-01
 
Photon flux (15-150 keV)    in 8.04 sec: 0.490128 ( -0.0717242  0.0717257 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.26842e-07 ( -4.18364e-08  4.33061e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.31074     (     )
Epeak [keV] : 133.255      (   )
Norm@50keV  : 2.49160E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.89 using 59 PHA bins.
# Reduced chi-squared =         0.9801 for     56 degrees of freedom 
# Null hypothesis probability =   5.169968e-01
 
Photon flux (15-150 keV)    in 8.04 sec: 0.489994 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.25212e-07 ( -4.1759e-08  4.50023e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -9.33665   ( 9.33665   9.33665 )
beta        : -2.16507    ( -0.332479   0.296934 )
Epeak [keV] : 1.67962      ( -1.67962 -1.67962 )
Norm@50keV   : 0.409758    ( -0.0900624   0.0859155 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.03 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     55 degrees of freedom 
# Null hypothesis probability =   4.734085e-01
 
Photon flux (15-150 keV)    in 8.04 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)  = 7.13e-08
S(50-100 keV) = 6.36e-08

T90 vs. Hardness ratio plot

T90                                   = 6.37199997901917 sec.
Hardness ratio (energy fluence ratio) = 0.892006

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.878766
Count Ratio (50-100 keV) / (15-25 keV) = 0.546014

Mask shadow pattern

IMX = -6.414519398469432E-01, IMY = 3.607626099574490E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

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:
-89.683400 -2.296000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3944  35.3688    5.1  53.8    4.9   0.8568   2.3    3.5	Her X-1                       
266.8183  38.2471    3.0  55.2   -7.7   1.3517   3.8 ------	UNKNOWN                       
272.9096  45.1551    2.3  50.8  -16.5   1.1531   5.0 ------	UNKNOWN

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

Time interval of the image:
-2.296000 5.744000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6529  35.2554    0.0  54.0    4.7   0.1873   1.7   10.9	Her X-1                       
230.4152  29.8480    2.6  51.0   31.1   0.6841   4.5 ------	UNKNOWN                       
263.8695  43.4444    2.3  49.6   -7.9   0.3177   5.0 ------	UNKNOWN                       
267.4174  38.3149    2.7  55.3   -8.3   0.3955   4.3 ------	UNKNOWN                       
 91.9791  55.7285    1.2  36.4 -150.6   0.4058  10.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
83.316600 962.711600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6361  22.0124    0.2  34.3 -164.1  35.3049  53.6    0.2	Crab                          
 86.1361  17.5541    2.9  38.5 -168.9   3.1495   3.9 ------	UNKNOWN                       
293.5752  68.0740    2.7  55.2   -7.6   9.1690   4.3 ------	UNKNOWN                       
 41.8395  66.5317    2.7  25.6  -43.0   2.4788   4.3 ------	UNKNOWN                       
353.4916  55.3938    4.5  50.7  -44.5  10.0360   2.6 ------	UNKNOWN                       
 40.6359  33.7894    3.8  41.3  -98.1  10.5990   3.1 ------	UNKNOWN

Plot creation:
Sat May 30 17:12:17 EDT 2015