batgrbproduct Analysis for Trigger=175603

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Wed Jan 22 19:15:24 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger175603
======================================================================

  Trigger: 00175603      Segment: 000

  BAT Trigger Time: 157929448.896   [s; MET]
      Trigger Stop: 157929450.944   [s; MET]
               UTC: 2006-01-02T21:17:27.963420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 328.85223917685   Dec: -1.84590276569756  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.21
     Image Trigger?:     NO
     Rate S/N Ratio:     13.3041346956501  [ if not an image trigger ]
     Image S/N Ratio:    8.21

  Flight Position:   [ source = BAT ]
    RA: 328.85223917685   Dec: -1.84590276569756  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 328.841195237682   Dec: -1.83606774698592  [deg; J2000]  
        { 21h 55m 21.9s , -01d 50' 09.8" }
         +/- 2.67092463108443 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.7362933849769 [arcmin] (formal 1-sigma fit error)
    SNR: 7.47483759455809
 
  Angular difference between Flight and Ground position is 0.887047 arcmin
 
  Partial Coding Fraction: 0.890625    [ including projection effects ]

  Duration
     T90: 19 +/- 5.09901951359278
        Measured from: -0.895999997854233
                   to: 18.1040000021458     [s; relative to TRIGTIME]
     T50: 14 +/- 9.5524865872714
        Measured from: 0.104000002145767
                   to: 14.1040000021458     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.104000002145767     
                   to: 1.10400000214577     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.895999997854233     
                   to: 22.1040000021458     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.093446   0.102287   0.121356   0.020275
           0.023414   0.023944   0.020542   0.016950 [error]
 Peak      0.012625   0.011580   0.021615   0.009730
           0.005013   0.005339   0.004579   0.003861 [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 2.35e-08 5.04e-08 8.51e-08 3.29e-07 2.34e-07 4.88e-07   erg/cm2
              Error 9.20e-09 1.13e-08 2.04e-08 1.91e-07 5.07e-08 2.02e-07   erg/cm2
Peak flux Power-law 5.97e-02 1.01e-01 1.31e-01 3.44e-01 3.87e-01 6.36e-01   ph/cm2/s
              Error 4.72e-02 4.82e-02 3.52e-02 2.47e-01 1.16e-01 2.25e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.34e-08 5.05e-08 8.52e-08 3.26e-07 2.34e-07 4.86e-07   erg/cm2
              Error 9.06e-09 1.12e-08 2.04e-08 2.92e-07 4.99e-08 2.69e-07   erg/cm2
Peak flux Cutoff-PL 6.22e-02 1.04e-01 1.31e-01 3.32e-01 3.89e-01 6.30e-01   ph/cm2/s
              Error 5.75e-02 -------- 3.69e-02 2.68e-01 -------- 2.69e-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    1.244    0.382    -      -           1.01e-03 1.95e-04   55.510 57
CPL   2.502    0.000     163.6    0.0      2.34e-04 0.00e+00   54.650 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.627    0.625    -      -           3.32e-03 1.14e-03   44.610 57
CPL   0.630    0.784    9999.4    0.0      3.36e-03 5.93e-03   44.620 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: 2.368000 sec.
T50 in the 50-300 keV band: 1.216000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   23.000   -0.896   22.104
T90    19.000   -0.896   18.104
T50    14.000    0.104   14.104
Peak    1.000    0.104    1.104
  • Click here for the BAT GCN circular template

    Image

    Pre-slew 15.0-350.0 keV image (Event data)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
      328.8412    -1.8361   0.0256    18.7200  -131.2042         0.3377734      7.475 TRIG_00175603                 
     
    Foreground time interval of the image:
     -0.896  22.104 (delta_t =  23.000 [sec])
    Background time interval of the image:
    -299.896  -0.896 (delta_t = 299.000 [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   -0.896 sec. to   22.104 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.24394     ( -0.387174   0.376932 )
    Norm@50keV  : 1.01434E-03    ( -0.000194738   0.000194725 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          55.51 using 59 PHA bins.
    # Reduced chi-squared =         0.9739 for     57 degrees of freedom 
    # Null hypothesis probability =   5.311241e-01
     
    Photon flux (15-150 keV)    in 23 sec: 0.119852 ( -0.023963  0.0240364 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.33853e-07 ( -5.04268e-08  5.10405e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -0.896 sec. to   22.104 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 2.50245     (     )
    Epeak [keV] : 163.606      (   )
    Norm@50keV  : 2.34284E-04    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          54.65 using 59 PHA bins.
    # Reduced chi-squared =         0.9759 for     56 degrees of freedom 
    # Null hypothesis probability =   5.261341e-01
     
    Photon flux (15-150 keV)    in 23 sec: 0.120391 ( -0.0245978  0.023565 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.33827e-07 ( -5.01057e-08  4.96455e-08 ) ergs/cm2
     
    
    Band function
    Time interval is from   -0.896 sec. to   22.104 sec.
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : -1.00576   ( 1.00636   1.00636 )
    beta        : -1.24388    ( 1.2439   0.387132 )
    Epeak [keV] : 47.2691      ( -46.6192 -46.6192 )
    Norm@50keV   : 1.83318E-03    ( -0.00101507   0.16252 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          55.51 using 59 PHA bins.
    # Reduced chi-squared =          1.009 for     55 degrees of freedom 
    # Null hypothesis probability =   4.553682e-01
     
    Photon flux (15-150 keV)    in 23 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]    : 20.5385  (-5.13854  7.98003)
    R^2/D10^2   : 4.82474E-03  (-0.00311108   0.00764317)
    (R is the radius in km and D10 is the distance to the source in units of 10 kpc)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.90 using 59 PHA bins.
    # Reduced chi-squared =          1.139 for     57 degrees of freedom 
    # Null hypothesis probability =   2.206478e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  8.927e-09   4.347e-09
    25- 50  4.525e-08   1.814e-08
    50-150  1.420e-07   5.981e-08
    15-150  1.961e-07   7.399e-08
    
    Thermal bremsstrahlung (OTTB)
     
     
    Spectral model: thermal bremsstrahlung
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT [keV]    : 200.000       (      )
    Norm        : 0.495461       (-0.0971084     0.0970998)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          58.43 using 59 PHA bins.
    # Reduced chi-squared =          1.025 for     57 degrees of freedom 
    # Null hypothesis probability =   4.224488e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  2.838e-08   1.667e-08
    25- 50  5.459e-08   3.198e-08
    50-150  1.197e-07   6.815e-08
    15-150  2.027e-07   1.179e-07
    
    Double BB
     
     
    Spectral model: bbodyrad<1> + bbodyrad<2>
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT1 [keV]   : 3.65388        (-2.97269      2.35148)
    R1^2/D10^2  : 1.82332        (-1.70079      -1.7751)
    kT2 [keV]   : 26.9377        (-8.19164      17.9262)
    R2^2/D10^2  : 1.89542E-03    (-0.00163   0.0061627)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          54.74 using 59 PHA bins.
    # Reduced chi-squared =         0.9952 for     55 degrees of freedom 
    # Null hypothesis probability =   4.846996e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  2.945e-08   1.651e-08
    25- 50  3.772e-08   1.900e-08
    50-150  1.647e-07   9.580e-08
    15-150  2.318e-07   1.127e-07
    

    Peak spectrum fit

    Power-law model
    Time interval is from    0.104 sec. to    1.104 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.627030     ( -0.695139   0.554258 )
    Norm@50keV  : 3.32321E-03    ( -0.00121276   0.00106957 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          44.61 using 59 PHA bins.
    # Reduced chi-squared =         0.7826 for     57 degrees of freedom 
    # Null hypothesis probability =   8.836512e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.386783 ( -0.115038  0.117417 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 4.19543e-08 ( -1.16528e-08  1.16932e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    0.104 sec. to    1.104 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.629739     ( -1.02071   0.547826 )
    Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
    Norm@50keV  : 3.36265E-03    ( -0.00122178   0.010633 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          44.62 using 59 PHA bins.
    # Reduced chi-squared =         0.7968 for     56 degrees of freedom 
    # Null hypothesis probability =   8.630146e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.389399 (    ) ph/cm2/s
    Energy fluence (15-150 keV)             : 4.19346e-08 ( -1.16261e-08  1.15516e-08 ) ergs/cm2
     
    
    Band function
    Time interval is from    0.104 sec. to    1.104 sec.
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : -0.789169   ( 0.788984   0.788984 )
    beta        : -0.626965    ( -0.553384   0.695229 )
    Epeak [keV] : 15.0897      ( -15.0904 -15.0904 )
    Norm@50keV   : 4.92863E-03    ( -0.00269451   0 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          44.61 using 59 PHA bins.
    # Reduced chi-squared =         0.8111 for     55 degrees of freedom 
    # Null hypothesis probability =   8.404512e-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]    : 35.9122  (-13.646  46.9137)
    R^2/D10^2   : 3.58046E-03  (-0.00357715   0.0104226)
    (R is the radius in km and D10 is the distance to the source in units of 10 kpc)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          47.04 using 59 PHA bins.
    # Reduced chi-squared =         0.8253 for     57 degrees of freedom 
    # Null hypothesis probability =   8.237104e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  6.426e-10   4.091e-10
    25- 50  4.238e-09   2.516e-09
    50-150  3.521e-08   2.032e-08
    15-150  4.009e-08   2.324e-08
    
    Thermal bremsstrahlung (OTTB)
     
     
    Spectral model: thermal bremsstrahlung
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT [keV]    : 200.000       (      )
    Norm        : 1.60958       (-0.486659     0.486607)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          52.73 using 59 PHA bins.
    # Reduced chi-squared =         0.9250 for     57 degrees of freedom 
    # Null hypothesis probability =   6.360616e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  4.011e-09   2.503e-09
    25- 50  7.716e-09   4.747e-09
    50-150  1.692e-08   1.022e-08
    15-150  2.865e-08   1.730e-08
    
    Double BB
     
     
    Spectral model: bbodyrad<1> + bbodyrad<2>
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT1 [keV]   : 5.26544        (-4.06235      27.1316)
    R1^2/D10^2  : 0.827525        (-0.823656      2282.59)
    kT2 [keV]   : 46.9576        (-21.1387      -46.9979)
    R2^2/D10^2  : 1.73197E-03    (-0.00170749   0.00317138)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          44.08 using 59 PHA bins.
    # Reduced chi-squared =         0.8014 for     55 degrees of freedom 
    # Null hypothesis probability =   8.542257e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  2.902e-09   1.901e-09
    25- 50  4.941e-09   2.595e-09
    50-150  3.583e-08   2.093e-08
    15-150  4.368e-08   2.320e-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: 1.24394     ( -0.387174   0.376932 )
    Norm@50keV  : 1.01434E-03    ( -0.000194738   0.000194725 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          55.51 using 59 PHA bins.
    # Reduced chi-squared =         0.9739 for     57 degrees of freedom 
    # Null hypothesis probability =   5.311241e-01
     
    Photon flux (15-150 keV)    in 23 sec: 0.119852 ( -0.023963  0.0240364 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.33853e-07 ( -5.04268e-08  5.10405e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 2.50245     (     )
    Epeak [keV] : 163.606      (   )
    Norm@50keV  : 2.34284E-04    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          54.65 using 59 PHA bins.
    # Reduced chi-squared =         0.9759 for     56 degrees of freedom 
    # Null hypothesis probability =   5.261341e-01
     
    Photon flux (15-150 keV)    in 23 sec: 0.120391 ( -0.0245978  0.023565 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.33827e-07 ( -5.01057e-08  4.96455e-08 ) ergs/cm2
     
    
    Band function
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : -1.00576   ( 1.00636   1.00636 )
    beta        : -1.24388    ( 1.2439   0.387132 )
    Epeak [keV] : 47.2691      ( -46.6192 -46.6192 )
    Norm@50keV   : 1.83318E-03    ( -0.00101507   0.16252 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          55.51 using 59 PHA bins.
    # Reduced chi-squared =          1.009 for     55 degrees of freedom 
    # Null hypothesis probability =   4.553682e-01
     
    Photon flux (15-150 keV)    in 23 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)  = 5.04e-08
    S(50-100 keV) = 8.51e-08
    

    T90 vs. Hardness ratio plot

    T90                                   = 19 sec.
    Hardness ratio (energy fluence ratio) = 1.68849
    

    Color vs. Color plot

    Count Ratio  (25-50 keV) / (15-25 keV) = 1.09461
    Count Ratio (50-100 keV) / (15-25 keV) = 1.29868
    

    Mask shadow pattern

    IMX = -2.232284873169235E-01, IMY = 2.549541479013678E-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:
    -299.896000 -0.896000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    288.7957  10.9740    1.1  39.1  -44.0   3.7490  10.7    1.7	GRS 1915+105                  
    299.5835  35.2031    0.2  31.7    0.2  13.3176  56.1    0.3	Cyg X-1                       
    308.1185  40.9485    1.4  29.9   17.2   1.8069   8.3    0.4	Cyg X-3                       
    326.1898  38.3277    4.5  21.6   44.0   0.5383   2.5    0.9	Cyg X-2                       
      1.7150  18.5198    2.2  31.5  131.3   1.6682   5.4 ------	UNKNOWN                       
    345.4014  19.3923    2.9  16.1  127.8   0.8153   4.0 ------	UNKNOWN                       
    288.2746  39.9964    2.4  41.8    1.2   1.5316   4.8 ------	UNKNOWN                       
    359.3392 -13.0381    2.7  42.6 -177.9   1.3754   4.2 ------	UNKNOWN                       
    333.7745  -0.9167    2.4  18.5 -147.0   0.9223   4.8 ------	UNKNOWN                       
    344.6352 -18.6544    2.6  38.9 -155.2   1.3991   4.4 ------	UNKNOWN                       
      4.2901 -31.1482    3.0  59.0 -166.2   6.8941   3.8 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -0.896000 22.104000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    288.8473  10.7383   17.1  39.1  -44.4   0.0503   0.7   12.8	GRS 1915+105                  
    299.4214  35.1297    6.0  31.8    0.0   0.0963   1.9    9.3	Cyg X-1                       
    308.2726  40.9512   18.1  29.8   17.3  -0.0336  -0.6    7.4	Cyg X-3                       
    325.9448  38.3394    5.6  21.6   43.5  -0.0979  -2.0   10.7	Cyg X-2                       
    355.3316 -20.9543    2.5  46.0 -166.3   0.3642   4.6 ------	UNKNOWN                       
    328.8412  -1.8360    1.5  18.7 -131.2   0.3379   7.5 ------	UNKNOWN                       
    325.5025 -21.9398    2.3  38.9 -126.0   0.3949   5.1 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
     
    
    Plot creation:
    Sun May 31 14:48:56 EDT 2015