batgrbproduct analysis for trigger=1330958

batgrbproduct Analysis for Trigger=1330958

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 v2.48
    Process Start Time (local time): Sun Mar  1 04:41:38 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1330958
======================================================================

  Trigger: 01330958      Segment: 000

  BAT Trigger Time: 773509746.88   [s; MET]
      Trigger Stop: 773509755.072   [s; MET]
               UTC: 2025-07-06T15:48:30.964200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 284.007496618123   Dec: 32.2870690698247  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.16
     Image Trigger?:     NO
     Rate S/N Ratio:     11.4891252930761  [ if not an image trigger ]
     Image S/N Ratio:    8.16

  Flight Position:   [ source = BAT ]
    RA: 284.007496618123   Dec: 32.2870690698247  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 284.00948859949   Dec: 32.330005907418  [deg; J2000]  
        { 18h 56m 02.3s , +32d 19' 48.0" }
         +/- 1.73171673361379 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.705196313271749 [arcmin] (formal 1-sigma fit error)
    SNR: 13.8815243939091
 
  Angular difference between Flight and Ground position is 2.578190 arcmin
 
  Partial Coding Fraction: 0.265625    [ including projection effects ]

  Duration
     T90: 39.4959999322891 +/- 8.6712270916167
        Measured from: 1.15600001811981
                   to: 40.6519999504089     [s; relative to TRIGTIME]
     T50: 18.8039999008179 +/- 4.53032136620223
        Measured from: 7.24800002574921
                   to: 26.0519999265671     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.932000041008     
                   to: 2.932000041008     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.175999999046326     
                   to: 49.2159999608994     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.582429   0.945049   0.793619   0.264480
           0.090464   0.094231   0.080625   0.064251 [error]
 Peak      0.011479   0.049399   0.075147   0.024922
           0.012663   0.014016   0.012868   0.009698 [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 2.20e-07 4.08e-07 5.83e-07 1.77e-06 1.66e-06 2.98e-06   erg/cm2
              Error 3.98e-08 4.68e-08 7.71e-08 4.89e-07 1.92e-07 5.48e-07   erg/cm2
Peak flux Power-law 2.56e-01 3.70e-01 3.98e-01 7.99e-01 1.27e+00 1.82e+00   ph/cm2/s
              Error 1.32e-01 1.23e-01 9.54e-02 3.82e-01 3.30e-01 4.53e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.85e-07 4.54e-07 6.27e-07 5.19e-07 1.57e-06 1.78e-06   erg/cm2
              Error 4.70e-08 6.00e-08 9.04e-08 4.99e-07 2.07e-07 5.28e-07   erg/cm2
Peak flux Cutoff-PL 1.44e-01 3.87e-01 4.92e-01 2.46e-01 1.20e+00 1.27e+00   ph/cm2/s
              Error 1.61e-01 1.53e-01 1.39e-01 4.35e-01 3.42e-01 5.31e-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    1.482    0.173    -      -           3.54e-03 3.82e-04   47.450 57
CPL   0.452    0.847      75.5   44.3      1.17e-02 1.41e-02   41.950 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.893    0.393    -      -           1.11e-02 2.88e-03   51.000 57
CPL  -1.012    3.087      95.3  -33.4      6.91e-02 1.30e+00   48.390 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: 25.344000 sec.
T50 in the 50-300 keV band: 12.224000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   49.392   -0.176   49.216
T90    39.496    1.156   40.652
T50    18.804    7.248   26.052
Peak    1.000    1.932    2.932

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  284.0095    32.3300   0.0138    39.2284   138.7756         2.7561984     13.882 TRIG_01330958                 
 
Foreground time interval of the image:
 -0.176  49.216 (delta_t =  49.392 [sec])
Background time interval of the image:
-239.880  -0.176 (delta_t = 239.704 [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 8.192000

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 8.192000

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 8.192000

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   -0.176 sec. to   49.216 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.48184     ( -0.173015   0.172968 )
Norm@50keV  : 3.54482E-03    ( -0.000382014   0.000381397 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.45     using 59 bins.
 Reduced chi-squared = 0.832456
# Null hypothesis probability of 8.12e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 49.39 sec: 0.440417 ( -0.048792  0.048925 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66617e-06 ( -1.91584e-07  1.92661e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.176 sec. to   49.216 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.452410     ( -0.925777   0.767635 )
Epeak [keV] : 75.4628      ( -16.2145 72.4004 )
Norm@50keV  : 1.17027E-02    ( -0.00679979   0.0214525 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   41.95     using 59 bins.
 Reduced chi-squared = 0.749107
# Null hypothesis probability of 9.18e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 49.39 sec: 0.424573 ( -0.050385  0.050435 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56549e-06 ( -2.05829e-07  2.08128e-07 ) ergs/cm2

Band function

Time interval is from   -0.176 sec. to   49.216 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 15.3490  (-1.75595  2.02157)
R^2/D10^2   : 4.80626E-02  (-0.0172887   0.0261935)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.68     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.74e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.166e-07   2.494e-08
25- 50  4.732e-07   7.171e-08
50-150  7.663e-07   1.558e-07
15-150  1.356e-06   1.835e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-66.1165      -199.363)
Norm        : 1.82812       (-0.193933     0.194263)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   45.05     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.74e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.248e-07   8.023e-08
25- 50  4.325e-07   1.776e-07
50-150  9.485e-07   5.200e-07
15-150  1.606e-06   7.595e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.21850        (-2.50394      4.40797)
R1^2/D10^2  : 0.330512        (-0.234735      1.01552)
kT2 [keV]   : 21.7283        (-4.79725      23.6316)
R2^2/D10^2  : 1.09747E-02    (-0.0102994   0.0192509)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   41.07     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.18e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.885e-07   1.072e-07
25- 50  4.547e-07   2.352e-07
50-150  9.193e-07   4.640e-07
15-150  1.563e-06   8.280e-07

Peak spectrum fit

Power-law model

Time interval is from    1.932 sec. to    2.932 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.893331     ( -0.413113   0.371975 )
Norm@50keV  : 1.10745E-02    ( -0.00291602   0.00284002 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.00     using 59 bins.
 Reduced chi-squared = 0.894737
# Null hypothesis probability of 6.98e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.27098 ( -0.326776  0.33245 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.24624e-07 ( -3.00983e-08  3.01186e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.932 sec. to    2.932 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01213     ( -4.20169   1.97252 )
Epeak [keV] : 95.2528      ( -28.4737 -95.2404 )
Norm@50keV  : 6.90695E-02    ( -0.0691101   2.53116 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.39     using 59 bins.
 Reduced chi-squared = 0.864107
# Null hypothesis probability of 7.55e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.19899 ( -0.341417  0.34217 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.17986e-07 ( -3.47406e-08  3.29004e-08 ) ergs/cm2

Band function

Time interval is from    1.932 sec. to    2.932 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 22.8232  (-5.29944  8.34671)
R^2/D10^2   : 4.43829E-02  (-0.027941   0.0606078)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.53     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.80e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.205e-09   2.148e-09
25- 50  2.272e-08   1.072e-08
50-150  8.841e-08   4.115e-08
15-150  1.153e-07   5.968e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-60.822      -200)
Norm        : 5.38001       (-1.39689     1.39689)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.78     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.10e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.341e-08   8.325e-09
25- 50  2.580e-08   1.540e-08
50-150  5.658e-08   3.358e-08
15-150  9.578e-08   5.735e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 19.0009        (-18.3106      10.6923)
R1^2/D10^2  : 6.70899E-02        (-0.0672563      0.183841)
kT2 [keV]   : 199.363        (-199.363      -199.363)
R2^2/D10^2  : 1.09211E-04    (-0.000109354   0.088183)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.53     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.53e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

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: 1.48184     ( -0.173015   0.172968 )
Norm@50keV  : 3.54482E-03    ( -0.000382014   0.000381397 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.45     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.12e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 49.39 sec: 0.440407 ( -0.0487898  0.0489213 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66593e-06 ( -1.91544e-07  1.92718e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.452404     ( -0.925776   0.767636 )
Epeak [keV] : 75.4625      ( -16.2145 72.4008 )
Norm@50keV  : 1.17028E-02    ( -0.00679979   0.0214525 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   41.95     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.18e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 49.39 sec: 0.424536 ( -0.050373  0.050424 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56606e-06 ( -2.05927e-07  2.08169e-07 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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)  = 4.08e-07
S(50-100 keV) = 5.83e-07

T90 vs. Hardness ratio plot

T90                                   = 39.4959999322891 sec.
Hardness ratio (energy fluence ratio) = 1.42892

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.6226
Count Ratio (50-100 keV) / (15-25 keV) = 1.3626

Mask shadow pattern

IMX = -6.140466471637072E-01, IMY = -5.380198872534634E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000

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:
-239.880000 -0.176000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5655  35.1873    0.6  27.5  127.3   8.9382  18.1    1.5	Cyg X-1                       
308.0058  40.8973    3.5  18.8  128.2   1.1937   3.3    5.8	Cyg X-3                       
326.4300  38.3791  370.5  11.8   77.8   0.0107   0.0   12.6	Cyg X-2                       
285.7788  23.0735    2.7  44.6  127.2   7.2993   4.4 ------	UNKNOWN                       
342.2208  33.1497    3.2  18.0   27.4   1.1709   3.6 ------	UNKNOWN                       
294.1643  65.3832    2.7  25.2 -160.5   1.6046   4.3 ------	UNKNOWN                       
240.5553  60.6787    2.5  49.1 -164.1   4.1685   4.6 ------	UNKNOWN

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

Time interval of the image:
-0.176000 49.216000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5678  35.1370   11.0  27.6  127.3   0.1219   1.1    4.0	Cyg X-1                       
308.1626  40.9398    6.9  18.7  128.1   0.1651   1.7    2.5	Cyg X-3                       
325.9137  38.2636    0.0  12.0   79.5   0.1791   1.9   12.6	Cyg X-2                       
284.0095  32.3300    0.8  39.2  138.8   2.7561  13.9 ------	UNKNOWN                       
359.4403  50.5800    2.4  17.6  -47.8   0.4251   4.8 ------	UNKNOWN                       
 38.2875  27.5440    1.7  54.4  -35.8   3.0026   6.8 ------	UNKNOWN                       
203.1175  74.4195    2.2  51.5 -139.2   2.0685   5.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
129.820610 508.320600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4244  35.3651    3.8  24.7 -162.1   1.5977   3.0    2.1	Her X-1                       
268.3406  -1.5642  134.4  37.0  119.3  -0.1205  -0.1    6.9	SW J1753.5-0127               
288.9407  11.0988    0.0  21.7   79.4   0.8826   1.3   12.4	GRS 1915+105                  
299.5835  35.1896    0.5  13.3  -14.3  13.2574  24.5    0.8	Cyg X-1                       
308.1146  40.9929    2.2  21.1  -28.6   2.7980   5.3    2.4	Cyg X-3                       
326.3338  38.3998   14.7  34.7  -19.7   0.5336   0.8    9.0	Cyg X-2                       
298.4748  65.6134    2.5  34.5  -76.9   4.6050   4.7 ------	UNKNOWN

Plot creation:
Sun Mar  1 23:35:58 EST 2026