batgrbproduct analysis for trigger=378554

batgrbproduct Analysis for Trigger=378554

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 19 12:28:05 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger378554
======================================================================

  Trigger: 00378554      Segment: 000

  BAT Trigger Time: 281954765.888   [s; MET]
      Trigger Stop: 281954766.912   [s; MET]
               UTC: 2009-12-08T08:46:00.559040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 0.274140327777107   Dec: 65.6736677782883  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.41
     Image Trigger?:     NO
     Rate S/N Ratio:     55.4707129934347  [ if not an image trigger ]
     Image S/N Ratio:    14.41

  Flight Position:   [ source = BAT ]
    RA: 0.274140327777107   Dec: 65.6736677782883  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 0.274380074759634   Dec: 65.6700083731657  [deg; J2000]  
        { 00h 01m 05.9s , +65d 40' 12.0" }
         +/- 1.23989208867154 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.555667893092608 [arcmin] (formal 1-sigma fit error)
    SNR: 22.372412818193
 
  Angular difference between Flight and Ground position is 0.219644 arcmin
 
  Partial Coding Fraction: 0.8828125    [ including projection effects ]

  Duration
     T90: 80 +/- 16
        Measured from: -0.888000011444092
                   to: 79.1119999885559     [s; relative to TRIGTIME]
     T50: 32 +/- 16
        Measured from: -0.888000011444092
                   to: 31.1119999885559     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.61199998855591     
                   to: 7.61199998855591     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.888000011444092     
                   to: 95.1119999885559     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.516962   0.718366   0.872866   0.384345
           0.052889   0.055521   0.050568   0.044644 [error]
 Peak      0.011883   0.028186   0.024974   0.008258
           0.005615   0.006118   0.005631   0.004745 [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 1.24e-07 3.21e-07 6.69e-07 3.55e-06 1.80e-06 4.67e-06   erg/cm2
              Error 1.97e-08 2.93e-08 4.75e-08 6.40e-07 1.27e-07 6.52e-07   erg/cm2
Peak flux Power-law 1.37e-01 1.78e-01 1.69e-01 2.86e-01 5.80e-01 7.70e-01   ph/cm2/s
              Error 6.24e-02 5.07e-02 4.39e-02 1.58e-01 1.40e-01 1.96e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.24e-07 3.20e-07 6.69e-07 3.53e-06 1.80e-06 4.73e-06   erg/cm2
              Error 1.97e-08 2.85e-08 4.71e-08 -------- 1.22e-07 --------   erg/cm2
Peak flux Cutoff-PL 1.16e-01 1.90e-01 1.83e-01 1.31e-01 5.64e-01 6.19e-01   ph/cm2/s
              Error 7.21e-02 6.01e-02 4.62e-02 2.19e-01 1.44e-01 2.22e-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    0.943    0.131    -      -           1.70e-03 1.19e-04   59.300 57
CPL   0.940    0.179    9999.4    0.0      1.71e-03 1.92e-04   59.410 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.072    0.401    -      -           5.01e-03 1.18e-03   52.470 57
CPL   0.286    1.714     115.8    0.0      1.19e-02 7.26e-02   51.750 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: 28.416000 sec.
T50 in the 50-300 keV band: 10.432000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   96.000   -0.888   95.112
T90    80.000   -0.888   79.112
T50    32.000   -0.888   31.112
Peak    1.000    6.612    7.612

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
    0.2744    65.6700   0.0086    25.7513  -177.7297         2.6061020     22.372 TRIG_00378554                 
 
Foreground time interval of the image:
 -0.888  95.112 (delta_t =  96.000 [sec])
Background time interval of the image:
-703.487 -648.857 (delta_t =  54.630 [sec])
-239.888  -0.888 (delta_t = 239.000 [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 1.024000

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 1.024000

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 1.024000

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   -0.888 sec. to   95.112 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.942703     ( -0.133573   0.129423 )
Norm@50keV  : 1.70095E-03    ( -0.000119138   0.000117909 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.30 using 59 PHA bins.
# Reduced chi-squared =          1.040 for     57 degrees of freedom 
# Null hypothesis probability =   3.918116e-01
 
Photon flux (15-150 keV)    in 96 sec: 0.195381 ( -0.0138117  0.0138986 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80301e-06 ( -1.2628e-07  1.26866e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.888 sec. to   95.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.940196     ( -0.229956   0.127106 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.71254E-03    ( -0.000118272   0.000266333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.41 using 59 PHA bins.
# Reduced chi-squared =          1.061 for     56 degrees of freedom 
# Null hypothesis probability =   3.524336e-01
 
Photon flux (15-150 keV)    in 96 sec: 0.196007 ( -0.014665  0.013278 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80209e-06 ( -1.2528e-07  1.19098e-07 ) ergs/cm2

Band function

Time interval is from   -0.888 sec. to   95.112 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.830427   ( 0.830427   0.830427 )
beta        : -0.942693    ( -0.129247   0.133611 )
Epeak [keV] : 27.5105      ( -27.511 -27.511 )
Norm@50keV   : 2.64752E-03    ( -0.00105896   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.30 using 59 PHA bins.
# Reduced chi-squared =          1.078 for     55 degrees of freedom 
# Null hypothesis probability =   3.217838e-01
 
Photon flux (15-150 keV)    in 96 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]    : 26.4344  (  )
R^2/D10^2   : 3.89067E-03  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         120.65 using 59 PHA bins.
# Reduced chi-squared =         2.1166 for     57 degrees of freedom 
# Null hypothesis probability =   1.823207e-06
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.398e-08   6.682e-09
25- 50  2.565e-07   3.086e-08
50-150  1.316e-06   1.320e-07
15-150  1.616e-06   1.450e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 0.821410       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         128.24 using 59 PHA bins.
# Reduced chi-squared =         2.2498 for     57 degrees of freedom 
# Null hypothesis probability =   2.099353e-07
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.964e-07   1.598e-08
25- 50  3.777e-07   3.691e-08
50-150  8.284e-07   1.960e-07
15-150  1.402e-06   2.812e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.49658        (-1.63953      2.22078)
R1^2/D10^2  : 0.134197        (-0.0766991      0.192207)
kT2 [keV]   : 46.0434        (-10.3144      25.442)
R2^2/D10^2  : 7.35012E-04    (-0.000471506   0.000730612)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.36 using 59 PHA bins.
# Reduced chi-squared =          1.025 for     55 degrees of freedom 
# Null hypothesis probability =   4.237230e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.416e-07   4.622e-08
25- 50  3.169e-07   7.114e-08
50-150  1.426e-06   3.787e-07
15-150  1.884e-06   5.060e-07

Peak spectrum fit

Power-law model

Time interval is from    6.612 sec. to    7.612 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.07206     ( -0.413913   0.387892 )
Norm@50keV  : 5.01076E-03    ( -0.00118325   0.00118023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.47 using 59 PHA bins.
# Reduced chi-squared =         0.9206 for     57 degrees of freedom 
# Null hypothesis probability =   6.453133e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.579726 ( -0.139509  0.140242 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.2863e-08 ( -1.34249e-08  1.36505e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    6.612 sec. to    7.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.286292     ( -2.31389   1.11417 )
Epeak [keV] : 115.831      ( -115.834 -115.834 )
Norm@50keV  : 1.19481E-02    ( -0.0119481   0.133345 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.75 using 59 PHA bins.
# Reduced chi-squared =         0.9241 for     56 degrees of freedom 
# Null hypothesis probability =   6.363265e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.563565 ( -0.143872  0.143979 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.01223e-08 ( -1.51097e-08  1.48435e-08 ) ergs/cm2

Band function

Time interval is from    6.612 sec. to    7.612 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -5   -5 )
beta        : -1.34373    ( -0.803554   0.52103 )
Epeak [keV] : 34.7550      ( -34.7551 15.4875 )
Norm@50keV   : 58.9128    ( -13.5614   1.25195e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.62 using 59 PHA bins.
# Reduced chi-squared =         0.9203 for     55 degrees of freedom 
# Null hypothesis probability =   6.426330e-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]    : 18.9511  (-4.93084  7.84671)
R^2/D10^2   : 3.32045E-02  (-0.0223491   0.05679)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.56 using 59 PHA bins.
# Reduced chi-squared =         0.9397 for     57 degrees of freedom 
# Null hypothesis probability =   6.047678e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.346e-09   1.381e-09
25- 50  1.126e-08   5.858e-09
50-150  2.972e-08   1.470e-08
15-150  4.333e-08   1.876e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 2.37537       (-0.578243     0.578215)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.99 using 59 PHA bins.
# Reduced chi-squared =         0.9822 for     57 degrees of freedom 
# Null hypothesis probability =   5.131085e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.915e-09   3.636e-09
25- 50  1.138e-08   6.700e-09
50-150  2.495e-08   1.485e-08
15-150  4.225e-08   2.496e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 11.5722        (-11.5722      4.88803)
R1^2/D10^2  : 0.110754        (-0.110754      -0.110754)
kT2 [keV]   : 45.9623        (-45.9623      -45.9623)
R2^2/D10^2  : 1.46608E-03    (-0.00146608   0.0441879)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.12 using 59 PHA bins.
# Reduced chi-squared =         0.9295 for     55 degrees of freedom 
# Null hypothesis probability =   6.235310e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.486e-09   2.286e-09
25- 50  1.197e-08   7.300e-09
50-150  3.604e-08   1.866e-08
15-150  5.150e-08   2.616e-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: 0.942703     ( -0.133573   0.129423 )
Norm@50keV  : 1.70095E-03    ( -0.000119138   0.000117909 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.30 using 59 PHA bins.
# Reduced chi-squared =          1.040 for     57 degrees of freedom 
# Null hypothesis probability =   3.918116e-01
 
Photon flux (15-150 keV)    in 96 sec: 0.195381 ( -0.0138117  0.0138986 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80301e-06 ( -1.2628e-07  1.26866e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.940196     ( -0.229956   0.127106 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.71254E-03    ( -0.000118272   0.000266333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.41 using 59 PHA bins.
# Reduced chi-squared =          1.061 for     56 degrees of freedom 
# Null hypothesis probability =   3.524336e-01
 
Photon flux (15-150 keV)    in 96 sec: 0.196007 ( -0.014665  0.013278 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80209e-06 ( -1.2528e-07  1.19098e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.830427   ( 0.830427   0.830427 )
beta        : -0.942693    ( -0.129247   0.133611 )
Epeak [keV] : 27.5105      ( -27.511 -27.511 )
Norm@50keV   : 2.64752E-03    ( -0.00105896   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.30 using 59 PHA bins.
# Reduced chi-squared =          1.078 for     55 degrees of freedom 
# Null hypothesis probability =   3.217838e-01
 
Photon flux (15-150 keV)    in 96 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)  = 3.21e-07
S(50-100 keV) = 6.69e-07

T90 vs. Hardness ratio plot

T90                                   = 80 sec.
Hardness ratio (energy fluence ratio) = 2.08411

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.38959
Count Ratio (50-100 keV) / (15-25 keV) = 1.68845

Mask shadow pattern

IMX = -4.819923381330219E-01, IMY = 1.910860112550748E-02

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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:
-703.487400 -648.857200
-239.888000 -0.888000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1059  38.2206    7.9  55.0 -150.1   1.5729   1.5    6.8	Cyg X-2                       
342.3551  33.3035    3.3  59.1 -166.1   5.1305   3.4 ------	UNKNOWN

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

Time interval of the image:
-0.888000 95.112000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.0612  38.2905   15.5  55.0 -150.0  -0.3688  -0.7    5.5	Cyg X-2                       
  0.2744  65.6700    0.5  25.8 -177.7   2.6057  22.4 ------	UNKNOWN                       
177.6187  30.4527    2.3  58.3   -6.0   3.4612   5.1 ------	UNKNOWN                       
205.9857  35.8590    2.3  55.0  -34.9   2.9242   4.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
325.012600 782.231400
840.112000 962.224800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6046  35.5200    0.0  41.8 -152.4  -0.3782  -0.7   12.8	Her X-1                       
156.5861   8.2700    2.9  49.9   24.7   4.8999   3.9 ------	UNKNOWN                       
265.5263  54.5030    2.4  47.2  179.3   3.0122   4.9 ------	UNKNOWN                       
172.4380 -15.3376    3.1  57.4   -9.5   5.8333   3.7 ------	UNKNOWN                       
268.4392  40.4504    2.2  51.2 -162.7   4.2103   5.3 ------	UNKNOWN                       
276.4399  35.3101    5.3  58.8 -159.2   5.9542   2.2 ------	UNKNOWN

Plot creation:
Sun May 31 02:30:32 EDT 2015