1 - Coordinated Universal Time UTC and its local realizations UTC(k). Computed v From 1999 January 1, 0h UTC, TAI-UTC = 32 s. Date 2004 0h UTC AUG 27 SEP 1 SEP 6 SEP 11 SEP 16 SEP 21 MJD 53244 53249 53254 53259 53264 53269 Laboratory k [UTC-UTC(k)]/ns AOS (Borowiec) -4.6 -1.3 3.4 -6.9 -9.9 -15.8 APL (Laurel) -8.6 -9.0 -13.8 -7.4 -0.1 -9.4 AUS (Sydney) -525.3 -516.5 -505.2 -502.6 -495.4 -470.5 BEV (Wien) 13.5 15.0 13.2 16.7 20.2 20.8 BIRM (Beijing) 703.8 718.8 733.2 747.4 755.6 771.0 CAO (Cagliari) -3555.2 -3522.1 -3509.4 -3516.2 -3504.5 -3486.8 CH (Bern) -18.4 -15.9 -15.5 -17.7 -10.9 -0.5 CNM (Queretaro) 24.4 10.9 8.1 1.1 4.5 4.2 CNMP (Panama) -1221.6 -1244.6 -1278.9 -1294.8 -1315.0 -1362.1 CSIR (Pretoria) -183.6 -261.7 -337.3 -416.3 -496.9 -571.4 DLR (Oberpfaffenhofen) - - - - - - DTAG (Darmstadt) 247.0 234.1 234.1 225.2 219.5 203.8 HKO (Hong Kong) 339.5 349.8 351.6 355.1 362.2 372.8 IEN (Torino) 42.4 38.6 38.0 39.4 29.6 23.0 IFAG (Wettzell) -3061.0 -3078.9 -3083.8 -3091.6 -3096.5 -3105.5 IGMA (Buenos Aires) 135.7 143.4 142.4 146.1 164.2 168.1 INPL (Jerusalem) -10736.9 -10786.5 -10844.1 -10909.1 -10968.1 -11023.3 JATC (Lintong) -10707.0 -10697.1 -10688.1 -10680.9 -10670.0 -10665.6 JV (Kjeller) -8250.8 -8242.2 -8174.8 -8138.5 -8079.3 -8051.8 KRIS (Daejon) -19.8 4.5 12.2 10.8 17.0 23.3 LDS (Leeds) 1018.1 1042.4 1074.8 1101.8 1120.0 1152.6 LT (Vilnius) 250.1 269.4 281.0 302.5 324.8 326.4 MSL (Lower Hutt) -120.6 -118.8 -123.3 -80.9 -70.3 -58.2 NAO (Mizusawa) -206.1 -201.6 -215.0 -208.9 -207.5 -213.7 NICT (Tokyo) 15.8 14.9 13.7 16.4 11.1 10.2 NIM (Beijing) -2651.0 -2655.7 -2654.7 -2658.5 -2666.2 -2658.3 NIMB (Bucharest) - - - - - - NIMT (Bangkok) -1599.3 -1620.3 -1638.9 -1654.9 -1683.0 -1712.6 NIS (Cairo) 564.8 588.9 600.3 623.9 662.7 554.2 NIST (Boulder) 2.4 2.5 3.7 4.7 4.2 4.1 NMC (Sofiya) -4338.8 -4349.9 -4361.6 -4386.2 -4402.2 -4411.1 NMIJ (Tsukuba) 24.5 8.6 0.4 0.9 -2.5 -7.0 NMLS (Shah Alam) - - - - - - NPL (Teddington) -26.4 -27.3 -29.3 -29.5 -30.5 -30.8 NPLI (New-Delhi) 8341.7 8392.4 8423.9 8458.6 8491.0 8526.7 NRC (Ottawa) 7.9 9.3 5.7 4.0 3.8 10.9 NTSC (Lintong) 17.4 24.1 20.6 23.2 12.9 6.4 OMH (Budapest) 9307.1 9341.6 9354.3 9370.4 9375.3 9406.7 ONBA (Buenos Aires) -347.8 -445.2 -436.8 -365.2 -349.7 -294.2 ONRJ (Rio de Janeiro) 2576.3 2767.8 2997.3 3237.3 3475.3 3733.3 OP (Paris) -5.3 -4.5 -0.5 -7.3 -10.6 -13.3 ORB (Bruxelles) -58.1 -59.6 -61.7 -63.8 -64.2 -62.7 PL (Warszawa) -48.2 -46.8 -45.9 -45.3 -41.5 -42.4 PTB (Braunschweig) -9.5 -4.1 -1.8 3.4 1.9 4.7 ROA (San Fernando) -0.2 1.1 1.6 3.8 1.9 1.3 SCL (Hong Kong) -8.4 -13.2 -20.8 -23.5 -10.6 -6.5 SG (Singapore) -15.6 -20.1 -18.4 -14.8 -20.4 -6.2 SMU (Bratislava) -70.9 -83.5 -102.4 -110.9 -123.1 -139.9 SP (Boras) 517.4 519.7 521.4 526.2 531.5 531.4 SU (Moskva) 50.3 54.5 54.6 59.2 63.9 66.0 TCC (Concepcion) -8481.9 -8556.1 -8591.1 -8679.7 -8765.5 -8818.6 TL (Chung-Li) 46.4 44.6 40.6 45.5 37.4 33.7 TP (Praha) -37.2 -28.5 -34.7 -33.8 -32.0 -31.4 UME (Gebze-Kocaeli) 312.8 308.6 313.1 317.3 320.1 319.3 USNO (Washington DC) -1.5 -1.9 -2.9 -4.5 -5.4 -5.2 VSL (Delft) -77.3 -76.4 -74.5 -79.2 -71.5 -69.3 - Notes on section 1: (1) DTAG: Correction to Circular T 200 note (2): No time step of [UTC-UTC(DTAG)] Value of [UTC-UTC(DTAG)] for MJD 53244 corrected in this Circular T. (2) NIMT: Corrected values /ns MJD UTC-UTC(NIMT) 53219 -1511.1 53224 -1525.3 53229 -1539.9 53234 -1561.4 53239 -1576.3 2 - International Atomic Time TAI and Local atomic time scales TA(k). Computed v Date 2004 0h UTC AUG 27 SEP 1 SEP 6 SEP 11 SEP 16 MJD 53244 53249 53254 53259 53264 Laboratory k [TAI-TA(k)]/ns CH (Bern) 45740.2 45844.9 45947.6 46047.6 46150.3 F (Paris) 169206.5 169199.8 169194.4 169187.1 169182.3 IEN (Torino) 38418.6 38523.8 38640.1 38752.5 38866.0 JATC (Lintong) -35704.0 -35746.1 -35786.1 -35826.9 -35864.0 KRIS (Taejon) 7646.8 7692.0 7722.5 7745.3 7774.9 NICT (Tokyo) 191828.0 192039.4 192249.4 192460.7 192672.2 NIST (Boulder) -45268132.0 -45268328.4 -45268523.7 -45268719.2 -45268915.2 NRC (Ottawa) 28915.1 28920.5 28921.7 28924.2 28928.4 NTSC (Lintong) 588.8 593.7 594.1 597.7 602.5 PL (Warszawa) -2569.2 -2580.8 -2589.9 -2599.3 -2608.5 PTB (Braunschweig) -359045.1 -359034.7 -359027.0 -359017.2 -359013.6 SU (Moskva) 27241050.3 27241054.5 27241054.6 27241059.2 27241063.9 USNO (Washington DC) -34938022.0 -34938329.6 -34938635.5 -34938943.4 -34939250.1 - Note on section 2: (1) SU : Listed values are TAI-TA(SU) - 2.80 seconds. 3 - Difference between the normalized frequencies of EAL (free atomic time scale Interval of validity f(EAL)-f(TAI) Steering correction 53244 - 53274 6.893x10**-13 (200 New correction 53274 - 53309 6.893x10**-13 (200 New correction foreseen 53309 - 53339 6.893x10**-13 (200 4 - Duration of the TAI scale interval. TAI is a realization of coordinate time TT. The following tables give the fracti interval of TAI from that of TT (the SI second on the geoid), i.e. the fractiona with the opposite sign: d = -yTAI. In this section, a frequency over a time inte the end-point phase difference to the duration of the interval. Whenever needed, be expressed as the quadratic sum of three components with t in days: (1) a whit 6.0x10**-15 / sqrt(t), (2) a flicker frequency noise of 0.6x10**-15 and (3) a ra 1.6x10**-16 x sqrt(t). The relation between EAL and TAI is given in Circular T a Time Section. In the first table, d is obtained, on the given periods of estimation by compari that of the given individual Primary Frequency Standards (PFS). In this table: u in the instability of the PFS, uB is the combined uncertainty from systematic ef giving information on the stated value of uB or is the Circular T where this ref the uncertainty in the link between the PFS and the clock participating to TAI, the dead-time, ul/TAI is the uncertainty in the link to TAI, u is the quadratic All values are expressed in 10**-15. Standard Period of d uA uB Ref(uB) ul/Lab ul/Tai u Note Estimation PTB-CS1 53244 53274 -4.6 5.0 8.0 T148 0.0 1.0 9.5 (1) PTB-CS2 53244 53274 -3.0 3.0 12.0 T148 0.0 1.0 12.4 (1) Notes: (1) Continuously operating as a clock participating to TAI. The second table gives the BIPM estimate of d, based on all available PFS measur 52884-53274, taking into account their individual uncertainties and characterizi noted above. u is the computed standard uncertainty of d Period of estimation d u 53244-53274 2.1x10**-15 2.5x10**-15 (2004 AUG 27 - 2 5 - Relations of UTC and TAI with GPS time and GLONASS time. [UTC-GPS time] = -13 s + C0, [TAI-GPS time] = 19 s + C0, global unc [UTC-GLONASS time] = 0 s + C1, [TAI-GLONASS time] = 32 s + C1, global unc The C0 values are obtained using the values [UTC-UTC(OP)] and the GPS data taken for IGS precise orbits, clocks and ionosphere maps. The C1 values are obtained u the GLONASS data taken at the NMi Van Swinden Laboratorium (VSL). N0 and N1 are standard deviations S0 and S1 characterize the dispersion of individual measurem user's access to GPS and GLONASS times may differ from these values. For this circular, S0 = 1.9 ns, S1 = 28.0 ns Date 2004 0h UTC MJD C0/ns N0 C1/ns N AUG 27 53244 -10.2 39 310.0 6 AUG 28 53245 -13.2 37 298.1 5 AUG 29 53246 -14.8 40 294.9 6 AUG 30 53247 -14.8 40 313.2 3 AUG 31 53248 -13.4 39 312.9 SEP 1 53249 -14.6 37 304.1 7 SEP 2 53250 -15.7 41 299.4 8 SEP 3 53251 -14.0 39 300.4 6 SEP 4 53252 -12.7 36 303.1 5 SEP 5 53253 -13.1 37 301.0 5 SEP 6 53254 -11.6 36 304.1 5 SEP 7 53255 -9.6 39 315.5 6 SEP 8 53256 -8.3 41 308.0 6 SEP 9 53257 -8.2 40 294.7 7 SEP 10 53258 -14.4 39 287.3 7 SEP 11 53259 -17.1 39 274.8 8 SEP 12 53260 -19.1 37 283.5 7 SEP 13 53261 -20.8 38 299.9 6 SEP 14 53262 -22.4 32 300.9 6 SEP 15 53263 -24.5 41 299.7 6 SEP 16 53264 -22.6 40 304.8 6 SEP 17 53265 -20.0 23 301.5 7 SEP 18 53266 -16.9 39 297.7 7 SEP 19 53267 -17.0 41 288.4 7 SEP 20 53268 -18.5 41 290.5 6 SEP 21 53269 -18.6 40 305.0 5 SEP 22 53270 -16.0 38 299.1 6 SEP 23 53271 -13.2 40 302.9 5 SEP 24 53272 -15.7 40 288.1 6 SEP 25 53273 -16.1 41 287.5 7 SEP 26 53274 -15.4 41 282.9 7 6 - Time links used for the computation of TAI and their uncertainties. The time links used in the elaboration of this Circular T are listed in this sec indicated as follows: GPS SC for GPS common-view single-channel C/A data; GPS MC C/A data; GPS P3 for GPS common-view multi-channel dual-frequency P code data; G INT LK for internal cable link and TWSTFT for two-way satellite time and frequen For each link, the following uncertainties are provided: uA is the statistical u account the level of phase noise in the raw data, the interpolation interval bet with typical duration between 5 and 30 days. uB is the uncertainty on the calibr The calibration type of the link is indicated as: GPS EC for GPS equipment calib calibration; LC (technique) for a link calibrated using 'technique'; BC (techniq 'technique' to transfer a past equipment calibration through a discontinuity of The calibration dates indicate: the most recent calibration results for the two the most recent calibration of the link in the c NA stands for not available, in this case estima Link Type uA/ns uB/ns Calibration Type Calibration Da AOS /PTB GPS MC 1.5 5.0 GPS EC /GPS EC 2003 Sep/2003 APL /USNO GPS MC 1.5 5.0 GPS EC /GPS EC 2003 Dec/2003 AUS /NICT GPS MC 3.0 5.0 GPS EC/GPS EC 2002 Sep/2003 BEV /PTB GPS MC 1.5 5.0 GPS EC/GPS EC 2001 Dec/2003 BIRM/NICT GPS MC 2.5 20.0 NA /GPS EC NA /2003 CAO /PTB GPS SC 7.0 20.0 NA /GPS EC NA /2003 CH /PTB GPS P3 0.7 5.0 GPS EC/GPS EC 2001 Feb/2003 CNM /NIST GPS SC 5.0 20.0 NA /GPS EC NA /2003 CNMP/USNO GPS MC 4.0 7.0 GPS EC/GPS EC 2002 Oct/2003 CSIR/PTB GPS MC 3.0 20.0 NA /GPS EC NA /2003 DLR NA DTAG/PTB GPS SC 3.0 10.0 GPS EC/GPS EC 1998 May/2003 HKO /NICT GPS MC 3.0 5.0 GPS EC/GPS EC 2004 Apr/2003 IEN /PTB TWSTFT 1.0 1.0 LC (TWSTFT) 2003 IFAG/PTB GPS P3 0.7 5.0 GPS EC/GPS EC 2003 Jun/2003 IGMA/USNO GPS MC 5.0 20.0 NA /GPS EC NA /2003 INPL/PTB GPS SC 4.0 10.0 GPS EC/GPS EC 1987 Jun/2003 JATC/NTSC INT LK 0.2 20.0 NA JV /PTB GPS GT 5.0 20.0 NA /GPS EC NA /2003 KRIS/NICT GPS MC 2.5 5.0 GPS EC/GPS EC 2003 Oct/2003 Link Type uA/ns uB/ns Calibration Type Calibration Da LDS /PTB GPS SC 3.0 20.0 NA /GPS EC NA /2003 LT /PTB GPS MC 1.5 5.0 GPS EC/GPS EC 2001 Nov/2003 MSL /NICT GPS P3 1.5 20.0 NA /GPS EC NA /2003 NAO /NICT GPS SC 3.0 20.0 NA /GPS EC NA /2003 NICT/PTB GPS P3 1.5 5.0 LC(GPS MC) 2004 NIM /NICT GPS SC 3.0 20.0 NA /GPS EC NA /2003 NIMB NA NIMT/NICT GPS P3 1.5 20.0 NA /GPS EC NA /2003 NIS /PTB GPS MC 3.0 20.0 NA /GPS EC NA /2003 NIST/PTB TWSTFT 0.5 5.0 LC(GPS SC) 2003 NMC /PTB GPS GT 5.0 20.0 NA /GPS EC NA /2003 NMIJ/NICT GPS SC 2.5 5.0 GPS EC/GPS EC 2002 Apr/2003 NMLS NA NPL /PTB TWSTFT 0.5 5.0 LC(GPS SC) 1999 NPLI/PTB GPS SC 3.0 20.0 NA /GPS EC NA /2003 NRC /USNO GPS SC 3.0 15.0 GPS EC/GPS EC 1982 /2003 NTSC/NICT GPS MC 2.5 5.0 GPS EC/GPS EC 2002 Aug/2003 OMH /PTB GPS SC 2.5 20.0 NA /GPS EC NA /2003 ONBA/USNO GPS MC 5.0 7.0 GPS EC/GPS EC 2000 Oct/2003 ONRJ/NIST GPS SC 5.0 20.0 NA /GPS EC NA /2003 OP /PTB GPS SC 2.5 5.0 GPS EC/GPS EC 2004 Jan/2003 ORB /PTB GPS P3 0.7 5.0 GPS EC/GPS EC 2003 Jul/2003 PL /PTB GPS MC 1.5 5.0 GPS EC/GPS EC 2001 Oct/2003 ROA /PTB TWSTFT 1.0 5.0 LC(GPS SC) 2001 SCL /NICT GPS SC 4.0 10.0 GPS EC/GPS EC 1993 May/2003 SG /NICT GPS MC 3.0 20.0 NA /GPS EC NA /2003 SMU /PTB GPS SC 5.0 20.0 NA /GPS EC NA /2003 SP /PTB GPS SC 3.0 10.0 GPS EC/GPS EC 1997 Oct/2003 SU /PTB GPS SC 3.0 5.0 GPS EC/GPS EC 2003 Apr/2003 TCC /NIST GPS SC 5.0 20.0 NA /GPS EC NA /2003 TL /NICT TWSTFT 1.5 5.0 LC(GPS SC) 2001 TP /PTB GPS SC 2.5 5.0 GPS EC/GPS EC 2001 Oct/2003 UME /PTB GPS SC 15.0 20.0 NA /GPS EC NA /2003 USNO/PTB TWSTFT 0.5 3.0 BC(GPS P3) 2003 VSL /PTB TWSTFT 1.0 5.0 LC(GPS SC) 1999