batgrbproduct Analysis for Trigger=416115

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Fri Jan 17 19:17:58 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger416115
======================================================================

  Trigger: 00416115      Segment: 000

  BAT Trigger Time: 290422685.12   [s; MET]
      Trigger Stop: 290422689.216   [s; MET]
               UTC: 2010-03-16T08:57:59.501360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 32.2910617778291   Dec: -68.0089406869357  [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:     11.0905365064094  [ if not an image trigger ]
     Image S/N Ratio:    7.19

  Flight Position:   [ source = BAT ]
    RA: 32.2910617778291   Dec: -68.0089406869357  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 32.3185629591155   Dec: -67.9914067680626  [deg; J2000]  
        { 02h 09m 16.5s , -67d 59' 29.1" }
         +/- 1.90794256818744 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.788423869823904 [arcmin] (formal 1-sigma fit error)
    SNR: 12.0867854157895
 
  Angular difference between Flight and Ground position is 1.220186 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 9.26799994707108 +/- 1.86981498371424
        Measured from: -2.65200001001358
                   to: 6.6159999370575     [s; relative to TRIGTIME]
     T50: 4.0239999294281 +/- 1.38675450094623
        Measured from: -0.124000012874603
                   to: 3.8999999165535     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.11599999666214     
                   to: 3.11599999666214     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.02799999713898     
                   to: 6.90399998426437     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.099771   0.108745   0.092996   0.037993
           0.014700   0.015293   0.013558   0.012027 [error]
 Peak      0.012639   0.014365   0.019105   0.009937
           0.004696   0.005011   0.004272   0.003866 [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 2.64e-08 4.65e-08 6.27e-08 1.74e-07 1.82e-07 3.09e-07   erg/cm2
              Error 5.93e-09 6.53e-09 1.31e-08 7.70e-08 3.08e-08 8.83e-08   erg/cm2
Peak flux Power-law 8.31e-02 1.14e-01 1.16e-01 2.13e-01 3.81e-01 5.25e-01   ph/cm2/s
              Error 5.04e-02 4.15e-02 3.32e-02 1.48e-01 1.07e-01 1.57e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.64e-08 4.66e-08 6.28e-08 1.49e-07 1.82e-07 2.93e-07   erg/cm2
              Error 5.91e-09 7.35e-09 1.33e-08 1.05e-07 3.23e-08 --------   erg/cm2
Peak flux Cutoff-PL 8.28e-02 1.14e-01 1.16e-01 2.12e-01 3.81e-01 5.24e-01   ph/cm2/s
              Error 4.52e-02 4.17e-02 3.78e-02 1.73e-01 1.07e-01 1.92e-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    1.570    0.259    -      -           1.95e-03 2.98e-04   49.050 57
CPL   1.568    0.631    9995.7    0.0      1.96e-03 0.00e+00   49.050 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.979    0.535    -      -           3.31e-03 9.19e-04   56.820 57
CPL   2.755    0.000     221.8    0.0      3.56e-04 0.00e+00   56.190 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: 8.832000 sec.
T50 in the 50-300 keV band: 3.328000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    9.932   -3.028    6.904
T90     9.268   -2.652    6.616
T50     4.024   -0.124    3.900
Peak    1.000    2.116    3.116
  • 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
       32.3186   -67.9914   0.0159     6.8226    -4.3614         0.3437399     12.087 TRIG_00416115                 
     
    Foreground time interval of the image:
     -3.028   6.904 (delta_t =   9.932 [sec])
    Background time interval of the image:
    -239.120  -3.028 (delta_t = 236.092 [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 4.096000
    

    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 4.096000
    

    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 4.096000
    

    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   -3.028 sec. to    6.904 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.56987     ( -0.254157   0.263145 )
    Norm@50keV  : 1.95225E-03    ( -0.000301761   0.000294819 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
    # Reduced chi-squared =         0.8606 for     57 degrees of freedom 
    # Null hypothesis probability =   7.638575e-01
     
    Photon flux (15-150 keV)    in 9.932 sec: 0.248589 ( -0.0346267  0.0346418 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.82036e-07 ( -3.04892e-08  3.1195e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -3.028 sec. to    6.904 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.56781     ( -0.911164   0.350472 )
    Epeak [keV] : 9995.67      (   )
    Norm@50keV  : 1.95729E-03    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
    # Reduced chi-squared =         0.8760 for     56 degrees of freedom 
    # Null hypothesis probability =   7.330188e-01
     
    Photon flux (15-150 keV)    in 9.932 sec: 0.248520 ( -0.035184  0.034606 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.82074e-07 ( -3.36278e-08  3.09243e-08 ) ergs/cm2
     
    
    Band function
    Time interval is from   -3.028 sec. to    6.904 sec.
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : -1.34234   ( 1.34234   1.34234 )
    beta        : -1.56987    ( 1.56987   0.254227 )
    Epeak [keV] : 30.7682      ( -30.7682 -30.7682 )
    Norm@50keV   : 3.48506E-03    ( -0.00180577   0.0773838 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
    # Reduced chi-squared =         0.8919 for     55 degrees of freedom 
    # Null hypothesis probability =   7.000853e-01
     
    Photon flux (15-150 keV)    in 9.932 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]    : 13.7366  (-2.52961  3.19085)
    R^2/D10^2   : 3.71266E-02  (-0.0191569   0.039001)
    (R is the radius in km and D10 is the distance to the source in units of 10 kpc)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.61 using 59 PHA bins.
    # Reduced chi-squared =          1.134 for     57 degrees of freedom 
    # Null hypothesis probability =   2.279855e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  1.472e-08   4.427e-09
    25- 50  5.372e-08   1.073e-08
    50-150  6.608e-08   2.200e-08
    15-150  1.345e-07   2.996e-08
    
    Thermal bremsstrahlung (OTTB)
     
     
    Spectral model: thermal bremsstrahlung
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT [keV]    : 198.394       (-103.361      -198.355)
    Norm        : 1.00941       (-0.140497     0.164382)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          49.41 using 59 PHA bins.
    # Reduced chi-squared =         0.8669 for     57 degrees of freedom 
    # Null hypothesis probability =   7.522022e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  2.498e-08   1.383e-08
    25- 50  4.803e-08   2.651e-08
    50-150  1.052e-07   5.761e-08
    15-150  1.782e-07   9.957e-08
    
    Double BB
     
     
    Spectral model: bbodyrad<1> + bbodyrad<2>
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT1 [keV]   : 5.12294        (-2.08448      3.1771)
    R1^2/D10^2  : 0.834020        (-0.675746      8.04831)
    kT2 [keV]   : 22.3926        (-6.23152      17.0074)
    R2^2/D10^2  : 5.71420E-03    (-0.00486592   0.0129414)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          49.32 using 59 PHA bins.
    # Reduced chi-squared =         0.8967 for     55 degrees of freedom 
    # Null hypothesis probability =   6.906292e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  2.740e-08   1.497e-08
    25- 50  4.328e-08   2.094e-08
    50-150  1.053e-07   6.127e-08
    15-150  1.760e-07   9.296e-08
    

    Peak spectrum fit

    Power-law model
    Time interval is from    2.116 sec. to    3.116 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.979470     ( -0.563136   0.506402 )
    Norm@50keV  : 3.31094E-03    ( -0.000933966   0.000904442 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          56.82 using 59 PHA bins.
    # Reduced chi-squared =         0.9969 for     57 degrees of freedom 
    # Null hypothesis probability =   4.817309e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.380909 ( -0.106812  0.107574 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 3.6061e-08 ( -1.03453e-08  1.04801e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    2.116 sec. to    3.116 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 2.75459     (     )
    Epeak [keV] : 221.838      (   )
    Norm@50keV  : 3.55605E-04    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          56.19 using 59 PHA bins.
    # Reduced chi-squared =          1.003 for     56 degrees of freedom 
    # Null hypothesis probability =   4.678955e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.380700 ( -0.107005  0.107582 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 3.59575e-08 ( -1.03944e-08  1.05291e-08 ) ergs/cm2
     
    
    Band function
    Time interval is from    2.116 sec. to    3.116 sec.
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : -0.875357   ( 0.875339   0.875339 )
    beta        : -0.979496    ( -0.507299   0.563217 )
    Epeak [keV] : 20.4007      ( -20.3455 -20.3455 )
    Norm@50keV   : 5.16821E-03    ( -0.00274381   0.567752 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          56.82 using 59 PHA bins.
    # Reduced chi-squared =          1.033 for     55 degrees of freedom 
    # Null hypothesis probability =   4.069973e-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]    : 22.8116  (-6.77068  13.8006)
    R^2/D10^2   : 1.20380E-02  (-0.012038   0.0254979)
    (R is the radius in km and D10 is the distance to the source in units of 10 kpc)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          58.97 using 59 PHA bins.
    # Reduced chi-squared =          1.035 for     57 degrees of freedom 
    # Null hypothesis probability =   4.033946e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  1.140e-09   7.380e-10
    25- 50  6.155e-09   3.703e-09
    50-150  2.393e-08   1.520e-08
    15-150  3.122e-08   1.725e-08
    
    Thermal bremsstrahlung (OTTB)
     
     
    Spectral model: thermal bremsstrahlung
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT [keV]    : 200.000       (      )
    Norm        : 1.57534       (-0.441807     0.441774)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          60.68 using 59 PHA bins.
    # Reduced chi-squared =          1.064 for     57 degrees of freedom 
    # Null hypothesis probability =   3.448548e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  3.925e-09   2.411e-09
    25- 50  7.551e-09   4.639e-09
    50-150  1.656e-08   1.006e-08
    15-150  2.803e-08   1.695e-08
    
    Double BB
     
     
    Spectral model: bbodyrad<1> + bbodyrad<2>
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT1 [keV]   : 1.84048        (-1.38997      2.20905)
    R1^2/D10^2  : 478.337        (-425.202      8147.81)
    kT2 [keV]   : 25.6924        (-8.06399      19.4224)
    R2^2/D10^2  : 8.04386E-03    (-0.00635556   0.0169479)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          53.48 using 59 PHA bins.
    # Reduced chi-squared =         0.9723 for     55 degrees of freedom 
    # Null hypothesis probability =   5.329828e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  2.969e-09   1.302e-09
    25- 50  5.264e-09   3.103e-09
    50-150  2.548e-08   1.562e-08
    15-150  3.371e-08   1.915e-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: 1.56987     ( -0.254157   0.263145 )
    Norm@50keV  : 1.95225E-03    ( -0.000301761   0.000294819 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
    # Reduced chi-squared =         0.8606 for     57 degrees of freedom 
    # Null hypothesis probability =   7.638575e-01
     
    Photon flux (15-150 keV)    in 9.932 sec: 0.248589 ( -0.0346267  0.0346418 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.82036e-07 ( -3.04892e-08  3.1195e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.56781     ( -0.911164   0.350472 )
    Epeak [keV] : 9995.67      (   )
    Norm@50keV  : 1.95729E-03    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
    # Reduced chi-squared =         0.8760 for     56 degrees of freedom 
    # Null hypothesis probability =   7.330188e-01
     
    Photon flux (15-150 keV)    in 9.932 sec: 0.248520 ( -0.035184  0.034606 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.82074e-07 ( -3.36278e-08  3.09243e-08 ) ergs/cm2
     
    
    Band function
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : -1.34234   ( 1.34234   1.34234 )
    beta        : -1.56987    ( 1.56987   0.254227 )
    Epeak [keV] : 30.7682      ( -30.7682 -30.7682 )
    Norm@50keV   : 3.48506E-03    ( -0.00180577   0.0773766 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          49.05 using 59 PHA bins.
    # Reduced chi-squared =         0.8919 for     55 degrees of freedom 
    # Null hypothesis probability =   7.000853e-01
     
    Photon flux (15-150 keV)    in 9.932 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)  = 4.65e-08
    S(50-100 keV) = 6.27e-08
    

    T90 vs. Hardness ratio plot

    T90                                   = 9.26799994707108 sec.
    Hardness ratio (energy fluence ratio) = 1.34839
    

    Color vs. Color plot

    Count Ratio  (25-50 keV) / (15-25 keV) = 1.08995
    Count Ratio (50-100 keV) / (15-25 keV) = 0.932094
    

    Mask shadow pattern

    IMX = 1.192961137551998E-01, IMY = 9.098437706870487E-03
    

    TIME vs. PHA plot around the trigger time

    Blue+Cyan dotted lines: Time interval of the scaled map
    From 0.000000 to 4.096000
    

    TIME vs. DetID plot around the trigger time

    Blue+Cyan dotted lines: Time interval of the scaled map
    From 0.000000 to 4.096000
    

    100 us light curve (15-350 keV)

    Blue+Cyan dotted lines: Time interval of the scaled map
    From 0.000000 to 4.096000
    

    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:
    -239.120000 -3.028000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    264.8028 -44.4388    7.1  54.1  168.9  -1.2444  -1.6    2.7	4U 1735-44                    
    255.6870 -48.8281    1.9  52.2  159.7   4.4574   5.9 ------	UNKNOWN                       
    310.3118 -30.1882    2.4  54.0 -143.3   5.6476   4.8 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -3.028000 6.904000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    264.6211 -44.5714    4.3  54.1  168.7  -0.3890  -2.7    9.0	4U 1735-44                    
    111.9779 -49.4695    2.3  45.4   48.5   0.6589   5.1 ------	UNKNOWN                       
    164.4811 -70.7454    2.1  35.8   96.5   0.4040   5.5 ------	UNKNOWN                       
     32.3186 -67.9914    1.0   6.8   -4.4   0.3437  12.1 ------	UNKNOWN                       
     59.2283 -36.4748    2.5  41.7  -10.5   0.1977   4.6 ------	UNKNOWN                       
     47.5823 -42.3193    2.6  33.4  -21.7   0.1500   4.4 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    62.380610 902.901200
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    165.0684 -68.2340    2.6  39.9  103.9   6.9342   4.4 ------	UNKNOWN                       
    115.7255 -59.7060    3.2  34.7   67.3   3.4829   3.7 ------	UNKNOWN                       
     63.3972 -38.7037    2.5  33.9   -4.7   2.7878   4.7 ------	UNKNOWN                       
     28.5788 -53.8672    2.8  14.2  -60.0   1.8325   4.1 ------	UNKNOWN                       
    337.7058 -45.7524    3.3  35.4 -130.4   2.6511   3.5 ------	UNKNOWN                       
    357.3838 -42.6524    2.9  31.3 -105.1   2.8968   4.0 ------	UNKNOWN                       
    
    Plot creation:
    Sun May 31 01:57:47 EDT 2015