HK25, NWT 250/1000 + SBIG ST-7 + Rc
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20200417)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 14/15 IV 2020; Rc_229_90s (202); 7.0h; minimum P, maximum, minimum S
# NOTE 2458954.39924 +/- 0.00049; 20200414 21:34:54 (UT) GEO
# NOTE 2458954.53413 +/- 0.00032; 20200415 00:49:09 (UT) GEO
# COND clear weather

----- EBFit result: -----
Tmin = 2458954.53409
Error (1 sigma): +0.00037/-0.00037 (Bootstrapping), +0.00079/-0.00081 (Prayer bead), +0.00033/-0.00033 (LSM)
Error (95% CI): +0.00085/-0.00068 (Bootstrapping), +0.00106/-0.00133 (Prayer bead)
LSM: chi^2 = 84.1, n_freedom = 68

HK25, NWT 250/1000 + SBIG ST-7 + Rc
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20200417)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 14/15 IV 2020; Rc_229_90s (202); 7.0h; minimum P, maximum, minimum S
# NOTE 2458954.39924 +/- 0.00049; 20200414 21:34:54 (UT) GEO
# NOTE 2458954.53413 +/- 0.00032; 20200415 00:49:09 (UT) GEO
# COND clear weather

----- EBFit result: -----
Tmin = 2458954.39892
Error (1 sigma): +0.00058/-0.00071 (Bootstrapping), +0.00028/-0.00042 (Prayer bead), +0.00052/-0.00052 (LSM)
Error (95% CI): +0.00115/-0.00130 (Bootstrapping), +0.00055/-0.00092 (Prayer bead)
LSM: chi^2 = 95.6, n_freedom = 69

HK25, NWT 250/1000 + SBIG ST-7 + BVRcIc
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20190302)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 27/28 II 2019; Rc_221_90s (221); 6.0h; minimum P, maximum, minimum S
# NOTE 2458542.51386 +/- 0.00026; 20190228 00:19:58 (UT) GEO
# NOTE 2458542.64821 +/- 0.00037; 20190228 03:33:25 (UT) GEO
# COND clear weather

----- EBFit result: -----
Tmin = 2458542.64824
Error (1 sigma): +0.00039/-0.00039 (Bootstrapping), +0.00012/-0.00012 (Prayer bead), +0.00037/-0.00037 (LSM)
Error (95% CI): +0.00081/-0.00081 (Bootstrapping), +0.00018/-0.00027 (Prayer bead)
LSM: chi^2 = 78.2, n_freedom = 68

HK25, NWT 250/1000 + SBIG ST-7 + BVRcIc
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20190302)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 27/28 II 2019; Rc_221_90s (221); 6.0h; minimum P, maximum, minimum S
# NOTE 2458542.51386 +/- 0.00026; 20190228 00:19:58 (UT) GEO
# NOTE 2458542.64821 +/- 0.00037; 20190228 03:33:25 (UT) GEO
# COND clear weather

----- EBFit result: -----
Tmin = 2458542.51385
Error (1 sigma): +0.00025/-0.00021 (Bootstrapping), +0.00005/-0.00005 (Prayer bead), +0.00026/-0.00026 (LSM)
Error (95% CI): +0.00048/-0.00045 (Bootstrapping), +0.00010/-0.00011 (Prayer bead)
LSM: chi^2 = 85.4, n_freedom = 84

HK25, NWT 250/1000 + SBIG ST-7 + Rc
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20180421)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 20/21 IV 2018; Rc_280_90s (214); 7.4h; minimum P, maximum, minimum S
# NOTE 2458229.38151 +/- 0.00042; 20180420 21:09:22 (UT) GEO
# NOTE 2458229.51454 +/- 0.00045; 20180421 00:20:56 (UT) GEO
# COND clear weather

----- EBFit result: -----
Tmin = 2458229.51453
Error (1 sigma): +0.00057/-0.00066 (Bootstrapping), +0.00028/-0.00035 (Prayer bead), +0.00046/-0.00046 (LSM)
Error (95% CI): +0.00118/-0.00123 (Bootstrapping), +0.00072/-0.00063 (Prayer bead)
LSM: chi^2 = 92.3, n_freedom = 76

HK25, NWT 250/1000 + SBIG ST-7 + Rc
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20180421)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 20/21 IV 2018; Rc_280_90s (214); 7.4h; minimum P, maximum, minimum S
# NOTE 2458229.38151 +/- 0.00042; 20180420 21:09:22 (UT) GEO
# NOTE 2458229.51454 +/- 0.00045; 20180421 00:20:56 (UT) GEO
# COND clear weather

----- EBFit result: -----
Tmin = 2458229.38149
Error (1 sigma): +0.00052/-0.00044 (Bootstrapping), +0.00100/-0.00097 (Prayer bead), +0.00042/-0.00042 (LSM)
Error (95% CI): +0.00105/-0.00093 (Bootstrapping), +0.00192/-0.00134 (Prayer bead)
LSM: chi^2 = 138.9, n_freedom = 81

Newton 600/2780
----- EBFit result: -----
Tmin = 2458226.38850
Error (1 sigma): +0.00024/-0.00023 (Bootstrapping), +0.00006/-0.00005 (Prayer bead), +0.00018/-0.00018 (LSM)
Error (95% CI): +0.00045/-0.00050 (Bootstrapping), +0.00012/-0.00010 (Prayer bead)
LSM: chi^2 = 33.0, n_freedom = 22

HK25, NWT 250/1000 + SBIG ST-7 + Rc
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20170329)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 28/29 III 2017; Rc_130_90s (114/64); 3.0h; minimum S
# NOTE 2457841.56892 +/- 0.00032; 20170329 01:39:15 (UT) GEO
# COND fine clear weather

----- EBFit result: -----
Tmin = 2457841.56895
Error (1 sigma): +0.00041/-0.00040 (Bootstrapping), +0.00068/-0.00084 (Prayer bead), +0.00032/-0.00032 (LSM)
Error (95% CI): +0.00077/-0.00075 (Bootstrapping), +0.00158/-0.00137 (Prayer bead)
LSM: chi^2 = 146.4, n_freedom = 89

HK25, NWT 250/1000 + SBIG ST-7 + Rc
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20110511)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 02/03 IV 2016; Rc_214_90s (160); 6.0h; minimum S and minimum P
# NOTE 2457481.37763 +/- 0.00081; 20160402 21:03:47 (UT) GEO
# NOTE 2457481.50922 +/- 0.00065; 20160403 00:13:17 (UT) GEO
# COND clear weather

----- EBFit result: -----
Tmin = 2457481.50921
Error (1 sigma): +0.00056/-0.00055 (Bootstrapping), +0.00013/-0.00016 (Prayer bead), +0.00065/-0.00065 (LSM)
Error (95% CI): +0.00115/-0.00114 (Bootstrapping), +0.00027/-0.00030 (Prayer bead)
LSM: chi^2 = 47.9, n_freedom = 62

HK25, NWT 250/1000 + SBIG ST-7 + Rc
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20110511)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 02/03 IV 2016; Rc_214_90s (160); 6.0h; minimum S and minimum P
# NOTE 2457481.37763 +/- 0.00081; 20160402 21:03:47 (UT) GEO
# NOTE 2457481.50922 +/- 0.00065; 20160403 00:13:17 (UT) GEO
# COND clear weather

----- EBFit result: -----
Tmin = 2457481.37764
Error (1 sigma): +0.00083/-0.00082 (Bootstrapping), +0.00135/-0.00095 (Prayer bead), +0.00080/-0.00080 (LSM)
Error (95% CI): +0.00172/-0.00150 (Bootstrapping), +0.00179/-0.00136 (Prayer bead)
LSM: chi^2 = 74.8, n_freedom = 88

EQ6 + 0.25-m f/4 + CCD ST7 + R
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20110511)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 09/10 IV 2015; Rc_245_90s (232); 6.8h; maximum, minimum P, maximum, minimum S
# NOTE 2457122.40231 +/- 0.00029; 20150409 21:39:20 (UT) GEO
# NOTE 2457122.53691 +/- 0.00042; 20150410 00:53:09 (UT) GEO
# COND clear weather

----- EBFit result: -----
Tmin = 2457122.53689
Error (1 sigma): +0.00037/-0.00040 (Bootstrapping), +0.00008/-0.00010 (Prayer bead), +0.00042/-0.00042 (LSM)
Error (95% CI): +0.00081/-0.00081 (Bootstrapping), +0.00015/-0.00020 (Prayer bead)
LSM: chi^2 = 69.3, n_freedom = 75

EQ6 + 0.25-m f/4 + CCD ST7 + R
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20110511)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT Rc
# RED CMunipack 1.1.26 + Peranso 2.50 + SPHE/VSES Upload Form (2012) var.astro.cz
# NOTE 09/10 IV 2015; Rc_245_90s (232); 6.8h; maximum, minimum P, maximum, minimum S
# NOTE 2457122.40231 +/- 0.00029; 20150409 21:39:20 (UT) GEO
# NOTE 2457122.53691 +/- 0.00042; 20150410 00:53:09 (UT) GEO
# COND clear weather

----- EBFit result: -----
Tmin = 2457122.40227
Error (1 sigma): +0.00031/-0.00030 (Bootstrapping), +0.00017/-0.00019 (Prayer bead), +0.00029/-0.00029 (LSM)
Error (95% CI): +0.00058/-0.00059 (Bootstrapping), +0.00021/-0.00042 (Prayer bead)
LSM: chi^2 = 89.3, n_freedom = 97

EQ6 + 0.25-m f/4 + CCD ST7 + R
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20110511)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT R
# RED CMunipack 1.1.26 + Peranso 2.50
# NOTE 08/09 III 2014; R_225_90s (208); minimum P, maximum, minimum S
# NOTE 2456725.47309 +/- 0.00017; 20140308 23:21:15 (UT) GEO
# NOTE 2456725.61003 +/- 0.00019; 20140309 02:38:27 (UT) GEO
# COND clear weather => foggy weather

----- EBFit result: -----
Tmin = 2456725.60986
Error (1 sigma): +0.00035/-0.00031 (Bootstrapping), +0.00022/-0.00017 (Prayer bead), +0.00038/-0.00038 (LSM)
Error (95% CI): +0.00067/-0.00071 (Bootstrapping), +0.00032/-0.00030 (Prayer bead)
LSM: chi^2 = 62.0, n_freedom = 81

EQ6 + 0.25-m f/4 + CCD ST7 + R
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20110511)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT R
# RED CMunipack 1.1.26 + Peranso 2.50
# NOTE 08/09 III 2014; R_225_90s (208); minimum P, maximum, minimum S
# NOTE 2456725.47309 +/- 0.00017; 20140308 23:21:15 (UT) GEO
# NOTE 2456725.61003 +/- 0.00019; 20140309 02:38:27 (UT) GEO
# COND clear weather => foggy weather

----- EBFit result: -----
Tmin = 2456725.47387
Error (1 sigma): +0.00030/-0.00031 (Bootstrapping), +0.00007/-0.00010 (Prayer bead), +0.00032/-0.00032 (LSM)
Error (95% CI): +0.00059/-0.00056 (Bootstrapping), +0.00013/-0.00015 (Prayer bead)
LSM: chi^2 = 72.3, n_freedom = 88

EQ6 + 0.25-m f/4 + CCD ST7 + R
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20110511)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT R
# RED CMunipack 1.1.26 + AVE 2.51
# NOTE 27/28 III 2012; R_210_90s (188); minimum S, maximum, minimum P
# NOTE 2456014.47001 +/- 0.00030; 20120327 23:16:49 (UT) GEO
# NOTE 2456014.60222 +/- 0.00022; 20120328 02:27:12 (UT) GEO
# COND cirrus -> overcast -> clear weather -> cirrus

EQ6 + 0.25-m f/4 + CCD ST7 + R
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20110511)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT R
# RED CMunipack 1.1.26 + AVE 2.51
# NOTE 27/28 III 2012; R_210_90s (188); minimum S, maximum, minimum P
# NOTE 2456014.47001 +/- 0.00030; 20120327 23:16:49 (UT) GEO
# NOTE 2456014.60222 +/- 0.00022; 20120328 02:27:12 (UT) GEO
# COND cirrus -> overcast -> clear weather -> cirrus

EQ6 + 0.25-m f/4 + CCD ST7 + R
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20110511)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT R
# RED CMunipack 1.1.26 + AVE 2.51
# NOTE 02/03 III 2012; R_85_90s (84/49); minimum P
# NOTE 2455989.57494 +/- 0.00021; 20120303 01:47:55 (UT) GEO
# COND nice clear weather

EQ6 + 0.25-m f/5 + CCD ST7 + R
# NAME EF CVn
# VAR 13:36:38.42 +28:11:40.6 2452308.4873 0.2720494 13.08-13.56c EW (VSX 20110511)
# OBS Martin Lehky (Hradec Kralove CZ; 0.25-m f/4 reflector + CCD ST7)
# FLT R
# RED CMunipack 1.1.26 + AVE 2.51
# NOTE 10/11 V 2011; R_72_90s (66/35); minimum S
# NOTE 2455692.36209 +/- 0.00023; 20110510 20:41:25 (UT) GEO
# COND clear weather