batgrbproduct analysis for trigger=663490

batgrbproduct Analysis for Trigger=663490

Analysis Summary

Special note:

During this time when the CZT bias voltage is at -150v (not the normal -200v; GCN Circ. 18562),
the energy scale in the plots below and in the data from the Quicklook and HEASARC sites
is somewhat off from the proper calibration.

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 Dec 14 18:17:13 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger663490
======================================================================

  Trigger: 00663490      Segment: 000

  BAT Trigger Time: 469187989.568   [s; MET]
      Trigger Stop: 469187990.08   [s; MET]
               UTC: 2015-11-14T09:59:34.155100    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 120.937400376558   Dec: -61.0422350757683  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.86
     Image Trigger?:     NO
     Rate S/N Ratio:     14.6287388383278  [ if not an image trigger ]
     Image S/N Ratio:    7.86

  Flight Position:   [ source = BAT ]
    RA: 120.937400376558   Dec: -61.0422350757683  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 120.947396108838   Dec: -61.032809935984  [deg; J2000]  
        { 08h 03m 47.4s , -61d 01' 58.1" }
         +/- 1.76696541978887 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.79400275657402 [arcmin] (formal 1-sigma fit error)
    SNR: 13.4876240179178
 
  Angular difference between Flight and Ground position is 0.635722 arcmin
 
  Partial Coding Fraction: 0.3046875    [ including projection effects ]

  Duration
     T90: 4.85599994659424 +/- 0.976696499773356
        Measured from: -3.76800000667572
                   to: 1.08799993991852     [s; relative to TRIGTIME]
     T50: 2.55599999427795 +/- 1.26618799732541
        Measured from: -1.932000041008
                   to: 0.623999953269958     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0559999942779541     
                   to: 0.944000005722046     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.25999999046326     
                   to: 1.25199997425079     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.232319   0.268409   0.111379   0.047037
           0.028663   0.029981   0.024786   0.022435 [error]
 Peak      0.111614   0.115733   0.056566   0.024120
           0.013749   0.014505   0.011447   0.009963 [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 9.29e-08 1.16e-07 1.05e-07 1.66e-07 3.71e-07 4.80e-07   erg/cm2
              Error 1.72e-08 1.53e-08 2.43e-08 7.53e-08 5.62e-08 1.03e-07   erg/cm2
Peak flux Power-law 1.36e+00 9.40e-01 4.25e-01 2.67e-01 2.86e+00 3.00e+00   ph/cm2/s
              Error 2.73e-01 1.30e-01 9.71e-02 1.16e-01 4.01e-01 4.13e-01   ph/cm2/s
 
Fluence   Cutoff-PL 9.02e-08 1.21e-07 1.04e-07 9.20e-08 3.61e-07 4.07e-07   erg/cm2
              Error 1.90e-08 2.06e-08 2.68e-08 1.18e-07 6.31e-08 1.38e-07   erg/cm2
Peak flux Cutoff-PL 1.30e+00 9.88e-01 4.28e-01 1.56e-01 2.82e+00 2.88e+00   ph/cm2/s
              Error 3.19e-01 1.79e-01 1.04e-01 1.92e-01 4.15e-01 4.74e-01   ph/cm2/s
 
Fluence        Band 8.76e-08 1.24e-07 1.00e-07 1.22e-07 3.60e-07 4.35e-07   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    2.141    0.252    -      -           7.21e-03 1.21e-03   57.830 57
CPL   1.802    0.769      24.8    0.0      1.13e-02 0.00e+00   57.490 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.145    0.261    -      -           1.78e-02 3.09e-03   49.790 57
CPL   1.725    0.919      28.3    0.0      3.08e-02 0.00e+00   49.390 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    5.512   -4.260    1.252
T90     4.856   -3.768    1.088
T50     2.556   -1.932    0.624
Peak    1.000   -0.056    0.944

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
  120.9474   -61.0328   0.0142    48.7760  -173.7845         0.7234658     13.488 TRIG_00663490                 
 
Foreground time interval of the image:
 -4.260   1.252 (delta_t =   5.512 [sec])
Background time interval of the image:
-239.267  -4.260 (delta_t = 235.007 [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 0.512000

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 0.512000

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 0.512000

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   -4.260 sec. to    1.252 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.14081     ( -0.241991   0.262857 )
Norm@50keV  : 7.20829E-03    ( -0.00123476   0.00119345 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.83 using 59 PHA bins.
# Reduced chi-squared =          1.015 for     57 degrees of freedom 
# Null hypothesis probability =   4.443531e-01
 
Photon flux (15-150 keV)    in 5.512 sec: 1.15744 ( -0.15286  0.153003 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.70751e-07 ( -5.57164e-08  5.66843e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -4.260 sec. to    1.252 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.80200     ( -1.26826   0.269313 )
Epeak [keV] : 24.7708      (   )
Norm@50keV  : 1.12872E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.49 using 59 PHA bins.
# Reduced chi-squared =          1.027 for     56 degrees of freedom 
# Null hypothesis probability =   4.197976e-01
 
Photon flux (15-150 keV)    in 5.512 sec: 1.14411 ( -0.15795  0.15745 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.60622e-07 ( -6.29989e-08  6.31416e-08 ) ergs/cm2

Band function

Time interval is from   -4.260 sec. to    1.252 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.81105   ( 1.90513   0.404787 )
beta        : -10.0000    ( 10   1.06581e-14 )
Epeak [keV] : 24.6902      ( -13.594 -24.6882 )
Norm@50keV   : 1.10973E-02    ( -0.00413192   0.0514151 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.49 using 59 PHA bins.
# Reduced chi-squared =          1.045 for     55 degrees of freedom 
# Null hypothesis probability =   3.830878e-01
 
Photon flux (15-150 keV)    in 5.512 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.59634e-07 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 9.31962  (-1.32393  1.53996)
R^2/D10^2   : 0.695866  (-0.316182   0.580491)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.70 using 59 PHA bins.
# Reduced chi-squared =          1.205 for     57 degrees of freedom 
# Null hypothesis probability =   1.378997e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.597e-08   1.614e-08
25- 50  1.480e-07   2.803e-08
50-150  6.274e-08   2.230e-08
15-150  2.767e-07   4.986e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 55.4718       (-17.1468      29.3154)
Norm        : 6.26022       (-1.34589     1.72121)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.97 using 59 PHA bins.
# Reduced chi-squared =          1.017 for     57 degrees of freedom 
# Null hypothesis probability =   4.394071e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.553e-08   1.604e-08
25- 50  1.270e-07   1.982e-08
50-150  1.351e-07   4.732e-08
15-150  3.476e-07   6.041e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.16659        (-4.26525      1.87604)
R1^2/D10^2  : 1.64418        (-0.930945      53.8404)
kT2 [keV]   : 29.0927        (-26.2068      -29.1111)
R2^2/D10^2  : 4.88060E-03    (-0.00465787   0.027518)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.58 using 59 PHA bins.
# Reduced chi-squared =          1.065 for     55 degrees of freedom 
# Null hypothesis probability =   3.455199e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.021e-08   3.506e-08
25- 50  1.318e-07   5.617e-08
50-150  1.534e-07   8.545e-08
15-150  3.654e-07   1.480e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.056 sec. to    0.944 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.14540     ( -0.250221   0.272237 )
Norm@50keV  : 1.77631E-02    ( -0.00314256   0.00303259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.79 using 59 PHA bins.
# Reduced chi-squared =         0.8734 for     57 degrees of freedom 
# Null hypothesis probability =   7.399721e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.85889 ( -0.400659  0.401149 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.65842e-07 ( -2.58336e-08  2.61938e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.056 sec. to    0.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.72512     ( -1.46596   0.372827 )
Epeak [keV] : 28.2609      (   )
Norm@50keV  : 3.07771E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.39 using 59 PHA bins.
# Reduced chi-squared =         0.8819 for     56 degrees of freedom 
# Null hypothesis probability =   7.216362e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.82023 ( -0.41686  0.41381 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.60995e-07 ( -2.8609e-08  1.4571e-08 ) ergs/cm2

Band function

Time interval is from   -0.056 sec. to    0.944 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.46505   ( 1.30435   1.30435 )
beta        : -2.58371    ( 2.57583   0.647808 )
Epeak [keV] : 32.4993      ( -34.0416 18.3428 )
Norm@50keV   : 4.39705E-02    ( -0.0261782   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.08 using 59 PHA bins.
# Reduced chi-squared =         0.8924 for     55 degrees of freedom 
# Null hypothesis probability =   6.989680e-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]    : 10.1528  (-1.40273  1.57896)
R^2/D10^2   : 1.24984  (-0.547388   0.987988)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.57 using 59 PHA bins.
# Reduced chi-squared =          1.028 for     57 degrees of freedom 
# Null hypothesis probability =   4.176713e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.637e-08   7.035e-09
25- 50  6.697e-08   1.523e-08
50-150  3.652e-08   1.316e-08
15-150  1.299e-07   2.451e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 56.3609       (-17.4483      30.2518)
Norm        : 15.3703       (-3.41544     4.31756)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.67 using 59 PHA bins.
# Reduced chi-squared =         0.8714 for     57 degrees of freedom 
# Null hypothesis probability =   7.438878e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.821e-08   7.505e-09
25- 50  5.702e-08   9.565e-09
50-150  6.152e-08   2.262e-08
15-150  1.568e-07   2.965e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 2.86335        (-1.29326      1.88095)
R1^2/D10^2  : 165.413        (-152.599      13323.6)
kT2 [keV]   : 12.1945        (-2.07714      3.65301)
R2^2/D10^2  : 0.532303    (-0.34604   0.637645)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.46 using 59 PHA bins.
# Reduced chi-squared =         0.8810 for     55 degrees of freedom 
# Null hypothesis probability =   7.211516e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.977e-08   1.926e-08
25- 50  5.659e-08   2.351e-08
50-150  4.858e-08   2.128e-08
15-150  1.449e-07   5.843e-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: 2.14081     ( -0.241991   0.262857 )
Norm@50keV  : 7.20829E-03    ( -0.00123476   0.00119345 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.83 using 59 PHA bins.
# Reduced chi-squared =          1.015 for     57 degrees of freedom 
# Null hypothesis probability =   4.443531e-01
 
Photon flux (15-150 keV)    in 5.512 sec: 1.15744 ( -0.15286  0.153003 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.70751e-07 ( -5.57164e-08  5.66843e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.80200     ( -1.26826   0.269313 )
Epeak [keV] : 24.7708      (   )
Norm@50keV  : 1.12872E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.49 using 59 PHA bins.
# Reduced chi-squared =          1.027 for     56 degrees of freedom 
# Null hypothesis probability =   4.197976e-01
 
Photon flux (15-150 keV)    in 5.512 sec: 1.14411 ( -0.15795  0.15745 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.60622e-07 ( -6.29989e-08  6.31416e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.81105   ( 1.90513   0.404787 )
beta        : -10.0000    ( 10   1.06581e-14 )
Epeak [keV] : 24.6902      ( -13.594 -24.6882 )
Norm@50keV   : 1.10973E-02    ( -0.00413192   0.0514151 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.49 using 59 PHA bins.
# Reduced chi-squared =          1.045 for     55 degrees of freedom 
# Null hypothesis probability =   3.830878e-01
 
Photon flux (15-150 keV)    in 5.512 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.59634e-07 ( 0  0 ) ergs/cm2

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

S(25-50 keV)  = 1.16e-07
S(50-100 keV) = 1.05e-07

T90 vs. Hardness ratio plot

T90                                   = 4.85599994659424 sec.
Hardness ratio (energy fluence ratio) = 0.905172

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.15535
Count Ratio (50-100 keV) / (15-25 keV) = 0.479423

Mask shadow pattern

IMX = -1.134617090002873E+00, IMY = 1.235697414465125E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

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:
-239.267410 -4.260000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
259.1503 -76.3903    3.2  33.9 -115.2   1.2096   3.6 ------	UNKNOWN

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

Time interval of the image:
-4.260000 1.252000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
120.9474 -61.0328    0.9  48.8 -173.8   0.7237  13.5 ------	UNKNOWN                       
324.4063 -15.0091    2.6  53.8   -6.5   0.3081   4.5 ------	UNKNOWN                       
290.9517 -43.1519    1.7  44.5  -59.1   0.6881   6.8 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
73.932600 962.464400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4896 -40.5423   67.1  22.4 -174.2  -0.0732  -0.2    1.9	Vela X-1                      
170.2277 -60.6435    4.5  23.5  -93.5   1.4201   2.5    2.9	Cen X-3                       
187.0805 -62.7897    0.0  29.8  -81.7  -1.0793  -1.5   11.7	GX 301-2                      
 39.0004 -50.1685    3.5  44.3   40.8   4.0799   3.3 ------	UNKNOWN                       
284.9361 -73.5509    4.4  45.0  -30.7   2.3925   2.7 ------	UNKNOWN

Plot creation:
Tue Dec 15 13:56:05 EST 2015