batgrbproduct analysis for trigger=1434591

batgrbproduct Analysis for Trigger=1434591

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.48
    Process Start Time (local time): Mon Jan 12 10:08:27 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/prebascript/trigger1434591/batgroup_hand_proc
======================================================================

  Trigger: 01434591      Segment: 000

  BAT Trigger Time: 789655672.064   [s; MET]
      Trigger Stop: 789655673.088   [s; MET]
               UTC: 2026-01-09T12:47:15.052300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 123.727972756729   Dec: -35.2579746928706  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.12
     Image Trigger?:     NO
     Rate S/N Ratio:     27.5317997958724  [ if not an image trigger ]
     Image S/N Ratio:    7.12

  Flight Position:   [ source = BAT ]
    RA: 123.727972756729   Dec: -35.2579746928706  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 123.749326462449   Dec: -35.2758941078627  [deg; J2000]  
        { 08h 14m 59.8s , -35d 16' 33.2" }
         +/- 3.35907851924127 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.87759385117056 [arcmin] (formal 1-sigma fit error)
    SNR: 5.38735135396189
 
  Angular difference between Flight and Ground position is 1.500088 arcmin
 
  Partial Coding Fraction: 0.8359375    [ including projection effects ]

  Duration
     T90: 1.02400004863739 +/- 
        Measured from: 0
                   to: 1.02400004863739     [s; relative to TRIGTIME]
     T50: 1.02400004863739 +/- 
        Measured from: 0
                   to: 1.02400004863739     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 1.02400004863739 second)
        Measured from: -5.96046447753906e-08     
                   to: 1.02399998903275     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 1.02400004863739     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.022606   0.031307   0.004573  -0.000119
           0.006133   0.006429   0.005316   0.004487 [error]
 Peak      0.022606   0.031307   0.004573  -0.000119
           0.006133   0.006429   0.005316   0.004487 [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 6.85e-09 8.68e-09 8.03e-09 1.30e-08 2.80e-08 3.64e-08   erg/cm2
              Error 2.44e-09 2.73e-09 4.14e-09 1.48e-08 1.03e-08 1.85e-08   erg/cm2
Peak flux Power-law 2.19e-01 1.53e-01 7.09e-02 4.58e-02 4.65e-01 4.89e-01   ph/cm2/s
              Error 7.89e-02 4.74e-02 3.55e-02 4.94e-02 1.40e-01 1.49e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.35e-09 1.29e-08 3.84e-09 5.75e-11 2.32e-08 2.32e-08   erg/cm2
              Error 2.79e-09 4.18e-09 4.75e-09 1.12e-09 7.75e-09 7.77e-09   erg/cm2
Peak flux Cutoff-PL 1.95e-01 2.29e-01 3.87e-02 3.20e-04 4.63e-01 4.63e-01   ph/cm2/s
              Error 8.90e-02 7.25e-02 4.43e-02 5.43e-03 1.31e-01 1.31e-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    2.117    0.502    -      -           2.93e-03 1.17e-03   69.380 57
CPL  -1.668    4.040      33.5    8.6      8.24e-01 3.68e+03   63.100 56
 
The chi2 of BB fit is 63.17 which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.117    0.502    -      -           2.93e-03 1.17e-03   69.380 57
CPL  -1.668    4.040      33.5    8.6      8.24e-01 3.68e+03   63.100 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    1.024    0.000    1.024
T90     1.024    0.000    1.024
T50     1.024    0.000    1.024
Peak    1.024   -0.000    1.024
  • Click here for the BAT GCN circular template
  • Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minutes to calcaulte

    Image

    Pre-slew 15-350 keV image (Event data; bkg subtracted)

    #   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
      123.7493 -35.2759 0.0355   18.7  138.3       0.0611     5.4  TRIG_01434591       
    ------------------------------------------
     
    Foreground time interval of the image:
      0.000   1.024 (delta_t =   1.024 [sec])
    Background time interval of the image:
    -60.064  -8.064 (delta_t =  52.000 [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 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)

    Spectra

    Notes:

    Time averaged spectrum fit using the pre-slew DRM

    Power-law model
    Time interval is from    0.000 sec. to    1.024 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 2.11676     ( -0.460389   0.544108 )
    Norm@50keV  : 2.93010E-03    ( -0.0011664   0.00116759 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          69.38 using 59 PHA bins.
    # Reduced chi-squared =          1.217 for     57 degrees of freedom 
    # Null hypothesis probability =   1.257701e-01
     
    Photon flux (15-150 keV)    in 1.024 sec: 0.464899 ( -0.139401  0.139723 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.79797e-08 ( -9.86739e-09  1.06569e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    0.000 sec. to    1.024 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.66781     ( -5.41731   2.6623 )
    Epeak [keV] : 33.4923      ( -7.56785 9.63568 )
    Norm@50keV  : 0.823822    ( -0.994365   7352.02 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          63.10 using 59 PHA bins.
    # Reduced chi-squared =          1.127 for     56 degrees of freedom 
    # Null hypothesis probability =   2.398389e-01
     
    Photon flux (15-150 keV)    in 1.024 sec: 0.463088 ( -0.129956  0.131675 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.31621e-08 ( -7.23466e-09  8.26511e-09 ) ergs/cm2
     
    
    Band function
    Time interval is from    0.000 sec. to    1.024 sec.
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : 1.67160   ( 1.10897   1.32147 )
    beta        : -10.00000    ( 10   1.48109e-10 )
    Epeak [keV] : 33.4830      ( -7.6391 9.20682 )
    Norm@50keV   : 0.832750    ( -0.226884   112.84 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          63.10 using 59 PHA bins.
    # Reduced chi-squared =          1.147 for     55 degrees of freedom 
    # Null hypothesis probability =   2.118426e-01
     
    Photon flux (15-150 keV)    in 1.024 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]    : 8.61583  (-1.9689  2.44219)
    R^2/D10^2   : 0.444884  (-0.281012   0.763116)
    (R is the radius in km and D10 is the distance to the source in units of 10 kpc)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          63.17 using 59 PHA bins.
    # Reduced chi-squared =          1.108 for     57 degrees of freedom 
    # Null hypothesis probability =   2.675503e-01
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  6.426e-09   3.585e-09
    25- 50  1.274e-08   7.760e-09
    50-150  4.246e-09   3.003e-09
    15-150  2.341e-08   1.477e-08
    
    Thermal bremsstrahlung (OTTB)
    XSPEC12>exit
     XSPEC: quit
     
     
    Spectral model: thermal bremsstrahlung
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT [keV]    : 44.4578       (-20.2618      56.583)
    Norm        : 2.95619       (-1.13417     1.81307)
    ------------------------------------------------------------
     Reduced chi-squared = 
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  7.182e-09   2.995e-09
    25- 50  9.871e-09   5.681e-09
    50-150  8.539e-09   6.608e-09
    15-150  2.559e-08   1.500e-08
    
    Double BB
    XSPEC12>exit
     XSPEC: quit
     
     
    Spectral model: bbodyrad<1> + bbodyrad<2>
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT1 [keV]   : 1.08318E-04        (199.905      -0.000108318)
    R1^2/D10^2  : 0.429196        (-0.429196      -0.429196)
    kT2 [keV]   : 8.61582        (-1.9689      2.44219)
    R2^2/D10^2  : 0.444884    (-0.281012   0.763118)
    ------------------------------------------------------------
     Reduced chi-squared = 
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  6.530e-09   1.055e-06
    25- 50  1.253e-08   7.593e-06
    50-150  4.622e-09   1.284e-04
    15-150  2.368e-08   1.320e-04
    

    Peak spectrum fit

    Power-law model
    Time interval is from    0.000 sec. to    1.024 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 2.11676     ( -0.460389   0.544108 )
    Norm@50keV  : 2.93010E-03    ( -0.0011664   0.00116759 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          69.38 using 59 PHA bins.
    # Reduced chi-squared =          1.217 for     57 degrees of freedom 
    # Null hypothesis probability =   1.257701e-01
     
    Photon flux (15-150 keV)    in 1.024 sec: 0.464899 ( -0.139401  0.139723 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.79797e-08 ( -9.86739e-09  1.06569e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    0.000 sec. to    1.024 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.66781     ( -5.41731   2.6623 )
    Epeak [keV] : 33.4923      ( -7.56785 9.63568 )
    Norm@50keV  : 0.823822    ( -0.994365   7352.02 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          63.10 using 59 PHA bins.
    # Reduced chi-squared =          1.127 for     56 degrees of freedom 
    # Null hypothesis probability =   2.398389e-01
     
    Photon flux (15-150 keV)    in 1.024 sec: 0.463088 ( -0.129956  0.131675 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.31621e-08 ( -7.23466e-09  8.26511e-09 ) ergs/cm2
     
    
    Band function
    Time interval is from    0.000 sec. to    1.024 sec.
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : 1.67160   ( 1.10897   1.32147 )
    beta        : -10.00000    ( 10   20 )
    Epeak [keV] : 33.4830      ( -7.6391 9.20682 )
    Norm@50keV   : 0.832750    ( -0.226884   112.84 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          63.10 using 59 PHA bins.
    # Reduced chi-squared =          1.147 for     55 degrees of freedom 
    # Null hypothesis probability =   2.118426e-01
     
    Photon flux (15-150 keV)    in 1.024 sec:  (    ) ph/cm2/s
    Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
     
    
    Single BB
     XSPEC: quit
     
     
    Spectral model blackbody:
    ------------------------------------------------------------
    Parameters  : value    Lower 90%  Upper 90%
    kT [keV]    : 8.61583  (-1.9689  2.44219)
    R^2/D10^2   : 0.444884  (-0.281012   0.763116)
    (R is the radius in km and D10 is the distance to the source in units of 10 kpc)
    ------------------------------------------------------------
     Reduced chi-squared = 
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  6.426e-09   3.867e-09
    25- 50  1.274e-08   6.975e-09
    50-150  4.246e-09   3.303e-09
    15-150  2.341e-08   1.260e-08
    
    Thermal bremsstrahlung (OTTB)
    XSPEC12>exit
     XSPEC: quit
     
     
    Spectral model: thermal bremsstrahlung
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT [keV]    : 44.4578       (-20.2618      56.583)
    Norm        : 2.95619       (-1.13417     1.81307)
    ------------------------------------------------------------
     Reduced chi-squared = 
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  7.182e-09   3.284e-09
    25- 50  9.871e-09   5.837e-09
    50-150  8.539e-09   6.266e-09
    15-150  2.559e-08   1.458e-08
    
    Double BB
    XSPEC12>exit
     XSPEC: quit
     
     
    Spectral model: bbodyrad<1> + bbodyrad<2>
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT1 [keV]   : 1.08318E-04        (199.905      -0.000108318)
    R1^2/D10^2  : 0.429196        (-0.429196      -0.429196)
    kT2 [keV]   : 8.61582        (-1.9689      2.44219)
    R2^2/D10^2  : 0.444884    (-0.281012   0.763118)
    ------------------------------------------------------------
     Reduced chi-squared = 
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  6.530e-09   1.265e-06
    25- 50  1.253e-08   7.910e-06
    50-150  4.622e-09   1.570e-04
    15-150  2.368e-08   1.598e-04
    

    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: 2.11676     ( -0.460389   0.544108 )
    Norm@50keV  : 2.93010E-03    ( -0.0011664   0.00116759 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          69.38 using 59 PHA bins.
    # Reduced chi-squared =          1.217 for     57 degrees of freedom 
    # Null hypothesis probability =   1.257701e-01
     
    Photon flux (15-150 keV)    in 1.024 sec: 0.464899 ( -0.139401  0.139723 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.79797e-08 ( -9.86739e-09  1.06569e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.66781     ( -5.41731   2.6623 )
    Epeak [keV] : 33.4923      ( -7.56785 9.63568 )
    Norm@50keV  : 0.823822    ( -0.994365   7352.02 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          63.10 using 59 PHA bins.
    # Reduced chi-squared =          1.127 for     56 degrees of freedom 
    # Null hypothesis probability =   2.398389e-01
     
    Photon flux (15-150 keV)    in 1.024 sec: 0.463088 ( -0.129956  0.131675 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.31621e-08 ( -7.23466e-09  8.26511e-09 ) ergs/cm2
     
    
    Band function
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : 1.67160   ( 1.10897   1.32147 )
    beta        : -10.00000    ( 10   1.07998e-09 )
    Epeak [keV] : 33.4830      ( -7.6391 9.20682 )
    Norm@50keV   : 0.832750    ( -0.226884   112.84 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          63.10 using 59 PHA bins.
    # Reduced chi-squared =          1.147 for     55 degrees of freedom 
    # Null hypothesis probability =   2.118426e-01
     
    Photon flux (15-150 keV)    in 1.024 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)  = 8.68e-09
    S(50-100 keV) = 8.03e-09
    

    T90 vs. Hardness ratio plot

    T90                                   = 1.02400004863739 sec.
    Hardness ratio (energy fluence ratio) = 0.925115
    

    Color vs. Color plot

    Count Ratio  (25-50 keV) / (15-25 keV) = 1.3849
    Count Ratio (50-100 keV) / (15-25 keV) = 0.202291
    

    Mask shadow pattern

    IMX = -2.529594281384006E-01, IMY = -2.252608541450744E-01
    

    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:
    -60.064000 -8.064000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    135.4301 -40.7335    9.1  21.6  168.5   0.1213   1.3   11.6	Vela X-1                      
    170.2352 -60.4794    3.4  36.2 -136.3  -0.4714  -3.4    8.9	Cen X-3                       
    186.8901 -62.8350   10.7  43.1 -129.4   0.2396   1.1    7.5	GX 301-2                      
    139.7770 -19.8464    1.9  39.4  144.7   1.3392   5.9 ------	UNKNOWN                       
     53.9149 -17.0143    2.4  53.6   19.5   2.0204   4.7 ------	UNKNOWN                       
    

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

    Time interval of the image:
    0.000000 1.024000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    135.7815 -40.6298    6.8  21.9  168.7  -0.0188  -1.7   12.4	Vela X-1                      
    170.6660 -60.5899    0.0  36.4 -136.1  -0.0148  -1.0   10.5	Cen X-3                       
    186.7437 -62.6863  172.6  43.1 -129.6   0.0017   0.1    5.6	GX 301-2                      
     57.1526 -20.1994    2.0  49.1   19.8   0.1830   5.8 ------	UNKNOWN                       
    127.4577 -30.2867    2.2  24.6  137.8   0.0686   5.2 ------	UNKNOWN                       
    123.7493 -35.2759    2.1  18.7  138.3   0.0611   5.4 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    69.436600 242.966000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    135.4154 -40.4464    5.3  10.6 -133.0   0.4826   2.2    8.3	Vela X-1                      
    170.3206 -60.7955    8.5  39.0 -110.1   0.8584   1.3   10.4	Cen X-3                       
    164.8032  -4.7468    2.5  48.6  165.0   3.4167   4.7 ------	UNKNOWN                       
     56.6639 -27.1447    2.6  56.9    2.3   4.4787   4.5 ------	UNKNOWN                       
    152.1363 -53.7116    2.3  27.1 -114.0   1.3309   5.1 ------	UNKNOWN                       
    142.1761 -63.8333    3.1  30.7  -91.7   1.3111   3.7 ------	UNKNOWN                       
    187.7315 -48.5772    2.1  48.0 -129.0   5.5320   5.5 ------	UNKNOWN                       
    
    Plot creation:
    Mon Jan 12 10:16:52 EST 2026