batgrbproduct Analysis for Trigger=453747

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Mon Jan 13 22:19:45 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger453747
======================================================================

  Trigger: 00453747      Segment: 000

  BAT Trigger Time: 327616135.168   [s; MET]
      Trigger Stop: 327616137.216   [s; MET]
               UTC: 2011-05-20T20:28:48.193920    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 134.375117604516   Dec: 56.401895388955  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.87
     Image Trigger?:     NO
     Rate S/N Ratio:     15.9059737205869  [ if not an image trigger ]
     Image S/N Ratio:    7.87

  Flight Position:   [ source = BAT ]
    RA: 134.375117604516   Dec: 56.401895388955  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 134.359584878478   Dec: 56.4210944883302  [deg; J2000]  
        { 08h 57m 26.3s , +56d 25' 15.9" }
         +/- 1.19479743924927 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.359074980866218 [arcmin] (formal 1-sigma fit error)
    SNR: 23.5883723976126
 
  Angular difference between Flight and Ground position is 1.262065 arcmin
 
  Partial Coding Fraction: 0.6953125    [ including projection effects ]

  Duration
     T90: 20.8640000224113 +/- 5.36723098024146
        Measured from: -0.191999971866608
                   to: 20.6720000505447     [s; relative to TRIGTIME]
     T50: 8.95999997854233 +/- 1.51721854264313
        Measured from: 2.75200003385544
                   to: 11.7120000123978     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.14000004529953     
                   to: 5.14000004529953     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.15200001001358     
                   to: 26.4959999918938     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.332642   0.625974   0.545709   0.165336
           0.036730   0.038611   0.034896   0.030042 [error]
 Peak      0.026936   0.043987   0.049045   0.013078
           0.006987   0.007632   0.007071   0.006036 [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 1.12e-07 2.45e-07 4.24e-07 1.70e-06 1.16e-06 2.48e-06   erg/cm2
              Error 1.46e-08 1.91e-08 3.32e-08 3.01e-07 8.45e-08 3.20e-07   erg/cm2
Peak flux Power-law 2.57e-01 3.33e-01 3.17e-01 5.33e-01 1.08e+00 1.44e+00   ph/cm2/s
              Error 8.41e-02 6.60e-02 5.52e-02 2.06e-01 1.78e-01 2.46e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.04e-07 2.52e-07 4.38e-07 1.08e-06 1.14e-06 1.88e-06   erg/cm2
              Error 1.78e-08 2.19e-08 3.83e-08 5.41e-07 9.19e-08 4.53e-07   erg/cm2
Peak flux Cutoff-PL 2.59e-01 3.34e-01 3.16e-01 5.24e-01 1.09e+00 1.43e+00   ph/cm2/s
              Error 8.97e-02 6.77e-02 5.94e-02 2.43e-01 1.77e-01 3.21e-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    1.209    0.118    -      -           4.15e-03 2.77e-04   51.070 57
CPL   0.883    0.446     185.7  -51.7      5.91e-03 3.07e-03   49.630 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.073    0.285    -      -           9.37e-03 1.49e-03   42.670 57
CPL   1.079    0.287    9999.2    0.0      9.42e-03 9.07e-03   42.680 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: 15.168000 sec.
T50 in the 50-300 keV band: 7.232000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   27.648   -1.152   26.496
T90    20.864   -0.192   20.672
T50     8.960    2.752   11.712
Peak    1.000    4.140    5.140
  • 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
      134.3596    56.4211   0.0082    30.1286    14.8159         1.7198390     23.588 TRIG_00453747                 
     
    Foreground time interval of the image:
     -1.152  25.533 (delta_t =  26.685 [sec])
    Background time interval of the image:
    -239.168  -1.152 (delta_t = 238.016 [sec])
    

    Lightcurves

    Notes:

    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)

    Spectral Evolution

    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from   -1.152 sec. to   26.496 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.20924     ( -0.118338   0.116885 )
    Norm@50keV  : 4.15141E-03    ( -0.000276928   0.00027683 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          51.07 using 59 PHA bins.
    # Reduced chi-squared =         0.8959 for     57 degrees of freedom 
    # Null hypothesis probability =   6.960511e-01
     
    Photon flux (15-150 keV)    in 27.65 sec: 0.487929 ( -0.0339505  0.0340316 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.16154e-06 ( -8.43032e-08  8.4664e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -1.152 sec. to   26.496 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.882795     ( -0.513243   0.377941 )
    Epeak [keV] : 185.650      ( -82.2153 -185.651 )
    Norm@50keV  : 5.91466E-03    ( -0.00192382   0.00422566 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          49.63 using 59 PHA bins.
    # Reduced chi-squared =         0.8862 for     56 degrees of freedom 
    # Null hypothesis probability =   7.131925e-01
     
    Photon flux (15-150 keV)    in 27.65 sec: 0.480714 ( -0.035479  0.035471 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.13851e-06 ( -9.23482e-08  9.13611e-08 ) ergs/cm2
     
    
    Band function
    Time interval is from   -1.152 sec. to   26.496 sec.
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : -8.12207E-02   ( -1.30873   0.230486 )
    beta        : -1.39486    ( 1.39005   0.215134 )
    Epeak [keV] : 69.3597      ( -38.7614 152.976 )
    Norm@50keV   : 1.78063E-02    ( -0.0179456   47.0752 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          47.93 using 59 PHA bins.
    # Reduced chi-squared =         0.8714 for     55 degrees of freedom 
    # Null hypothesis probability =   7.392646e-01
     
    Photon flux (15-150 keV)    in 27.65 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]    : 18.5452  (-1.61526  1.82879)
    R^2/D10^2   : 2.85571E-02  (-0.00771431   0.0102717)
    (R is the radius in km and D10 is the distance to the source in units of 10 kpc)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          86.47 using 59 PHA bins.
    # Reduced chi-squared =          1.517 for     57 degrees of freedom 
    # Null hypothesis probability =   7.126802e-03
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  5.384e-08   7.576e-09
    25- 50  2.545e-07   2.912e-08
    50-150  6.400e-07   7.728e-08
    15-150  9.483e-07   8.032e-08
    
    Thermal bremsstrahlung (OTTB)
     
     
    Spectral model: thermal bremsstrahlung
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT [keV]    : 200.000       (      )
    Norm        : 2.04070       (-0.138523     0.138501)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          73.40 using 59 PHA bins.
    # Reduced chi-squared =          1.288 for     57 degrees of freedom 
    # Null hypothesis probability =   7.075711e-02
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  1.405e-07   1.212e-08
    25- 50  2.702e-07   3.655e-08
    50-150  5.927e-07   1.580e-07
    15-150  1.003e-06   2.072e-07
    
    Double BB
     
     
    Spectral model: bbodyrad<1> + bbodyrad<2>
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT1 [keV]   : 10.1266        (-2.32041      2.60338)
    R1^2/D10^2  : 0.139510        (-0.0637047      0.147709)
    kT2 [keV]   : 41.0029        (-12.761      68.9387)
    R2^2/D10^2  : 1.69347E-03    (-0.00148734   0.0040411)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          48.15 using 59 PHA bins.
    # Reduced chi-squared =         0.8755 for     55 degrees of freedom 
    # Null hypothesis probability =   7.315860e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  9.088e-08   2.425e-08
    25- 50  2.733e-07   6.950e-08
    50-150  7.861e-07   3.332e-07
    15-150  1.150e-06   4.084e-07
    

    Peak spectrum fit

    Power-law model
    Time interval is from    4.140 sec. to    5.140 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.07331     ( -0.29191   0.278272 )
    Norm@50keV  : 9.37467E-03    ( -0.00149089   0.00148533 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          42.67 using 59 PHA bins.
    # Reduced chi-squared =         0.7486 for     57 degrees of freedom 
    # Null hypothesis probability =   9.207944e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.08476 ( -0.177189  0.177936 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 9.88676e-08 ( -1.69626e-08  1.7097e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    4.140 sec. to    5.140 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.07898     ( -0.301084   0.273705 )
    Epeak [keV] : 9999.17      ( -9999.36 -9999.36 )
    Norm@50keV  : 9.42243E-03    ( -0.00147434   0.0166642 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          42.68 using 59 PHA bins.
    # Reduced chi-squared =         0.7622 for     56 degrees of freedom 
    # Null hypothesis probability =   9.049970e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.08568 ( -0.178796  0.17515 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 9.89058e-08 ( -1.71813e-08  1.69502e-08 ) ergs/cm2
     
    
    Band function
    Time interval is from    4.140 sec. to    5.140 sec.
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : 4.82907   ( -4.82907   -4.82907 )
    beta        : -1.13619    ( -0.324039   0.315656 )
    Epeak [keV] : 26.1973      ( -26.1973 12.058 )
    Norm@50keV   : 395.096    ( -61.9136   2.48062e+06 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          42.04 using 59 PHA bins.
    # Reduced chi-squared =         0.7644 for     55 degrees of freedom 
    # Null hypothesis probability =   9.003532e-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]    : 21.1491  (-4.53329  6.39802)
    R^2/D10^2   : 4.23577E-02  (-0.0238533   0.0500808)
    (R is the radius in km and D10 is the distance to the source in units of 10 kpc)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          52.81 using 59 PHA bins.
    # Reduced chi-squared =         0.9265 for     57 degrees of freedom 
    # Null hypothesis probability =   6.329697e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  3.568e-09   1.241e-09
    25- 50  1.842e-08   5.962e-09
    50-150  6.145e-08   2.001e-08
    15-150  8.345e-08   2.324e-08
    
    Thermal bremsstrahlung (OTTB)
     
     
    Spectral model: thermal bremsstrahlung
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT [keV]    : 200.000       (      )
    Norm        : 4.46759       (-0.730245     0.730177)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          50.83 using 59 PHA bins.
    # Reduced chi-squared =         0.8917 for     57 degrees of freedom 
    # Null hypothesis probability =   7.044411e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  1.112e-08   6.430e-09
    25- 50  2.140e-08   1.218e-08
    50-150  4.693e-08   2.592e-08
    15-150  7.946e-08   4.548e-08
    
    Double BB
     
     
    Spectral model: bbodyrad<1> + bbodyrad<2>
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT1 [keV]   : 9.17660        (-4.32415      6.23362)
    R1^2/D10^2  : 0.413355        (-0.316007      0.601309)
    kT2 [keV]   : 47.5958        (-43.3898      -48.2786)
    R2^2/D10^2  : 3.11519E-03    (-0.00275805   0.0201357)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          42.40 using 59 PHA bins.
    # Reduced chi-squared =         0.7710 for     55 degrees of freedom 
    # Null hypothesis probability =   8.929725e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  7.643e-09   4.423e-09
    25- 50  2.071e-08   1.189e-08
    50-150  7.257e-08   3.971e-08
    15-150  1.009e-07   5.080e-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: 1.20021     ( -0.117535   0.116018 )
    Norm@50keV  : 4.24646E-03    ( -0.000282204   0.000282073 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          52.78 using 59 PHA bins.
    # Reduced chi-squared =         0.9259 for     57 degrees of freedom 
    # Null hypothesis probability =   6.341711e-01
     
    Photon flux (15-150 keV)    in 26.68 sec: 0.498462 ( -0.034544  0.0346173 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.14936e-06 ( -8.29649e-08  8.3304e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.852937     ( -0.514045   0.396046 )
    Epeak [keV] : 179.028      ( -76.3785 -179.028 )
    Norm@50keV  : 6.19041E-03    ( -0.002094   0.00443998 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          51.15 using 59 PHA bins.
    # Reduced chi-squared =         0.9133 for     56 degrees of freedom 
    # Null hypothesis probability =   6.588063e-01
     
    Photon flux (15-150 keV)    in 26.68 sec: 0.490739 ( -0.036062  0.036058 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.12503e-06 ( -9.10962e-08  9.00957e-08 ) ergs/cm2
     
    
    Band function
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : 9.75801E-03   ( -1.037   0.0999143 )
    beta        : -1.40097    ( 1.39789   0.214956 )
    Epeak [keV] : 67.9342      ( -36.3031 105.684 )
    Norm@50keV   : 2.01845E-02    ( -0.0217032   36.6456 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          48.94 using 59 PHA bins.
    # Reduced chi-squared =         0.8898 for     55 degrees of freedom 
    # Null hypothesis probability =   7.040885e-01
     
    Photon flux (15-150 keV)    in 26.68 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)  = 2.45e-07
    S(50-100 keV) = 4.24e-07
    

    T90 vs. Hardness ratio plot

    T90                                   = 20.8640000224113 sec.
    Hardness ratio (energy fluence ratio) = 1.73061
    

    Color vs. Color plot

    Count Ratio  (25-50 keV) / (15-25 keV) = 1.88182
    Count Ratio (50-100 keV) / (15-25 keV) = 1.64053
    

    Mask shadow pattern

    IMX = 5.610522469974785E-01, IMY = -1.484031830978243E-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:
    -239.168000 -1.152000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     83.6321  22.0205    0.3  26.8 -111.7   9.7701  36.1    0.4	Crab                          
    151.6301  15.7103    3.0  39.0   93.5   3.2969   3.8 ------	UNKNOWN                       
    136.2542  -4.7533    2.4  42.3  132.8   3.1514   4.7 ------	UNKNOWN                       
     63.0856  34.3183    2.9  41.1  -81.3   3.2513   4.0 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -1.152000 25.532600
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     83.4692  22.0534    5.0  27.0 -111.5   0.1726   2.3    9.4	Crab                          
    165.2193  53.8765    2.8  44.3   32.6   0.6021   4.2 ------	UNKNOWN                       
    186.5702  72.4871    2.5  56.3   10.5   1.7211   4.6 ------	UNKNOWN                       
    134.3597  56.4213    0.5  30.1   14.8   1.7193  23.6 ------	UNKNOWN                       
     58.1437  47.2529    2.6  44.1  -61.9   1.0531   4.4 ------	UNKNOWN                       
     66.2024  23.6462    2.0  41.1  -98.1   1.4961   5.7 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    83.532600 962.878700
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    223.2269  62.4581    3.8  42.0   43.0   4.9931   3.5 ------	UNKNOWN                       
    222.6601  62.5138    3.8  41.7   43.2   5.6642   4.0 ------	UNKNOWN                       
      1.5658  60.1642    3.3  57.6  -26.3  11.6113   3.5 ------	UNKNOWN                       
    105.7168   6.0113    4.1  55.2 -145.3  10.9307   2.8 ------	UNKNOWN                       
    
    Plot creation:
    Sat May 30 22:16:36 EDT 2015