CIRCULAR T 337 ISSN 1143-1393
2016 FEBRUARY 11, 14h UTC
BUREAU INTERNATIONAL DES POIDS ET MESURES
ORGANISATION INTERGOUVERNEMENTALE DE LA CONVENTION DU METRE
PAVILLON DE BRETEUIL F-92312 SEVRES CEDEX TEL. +33 1 45 07 70 70 FAX. +33 1 45 34 20 21 tai@bipm.org

The contents of the sections of BIPM Circular T are fully described in the document " Explanatory supplement to BIPM Circular T " available at https://webtai.bipm.org/ftp/pub/tai/other-products/notes/explanatory_supplement_v0.1.pdf

1 - Difference between UTC and its local realizations UTC(k) and corresponding uncertainties. From 2015 July 1, 0h UTC, TAI-UTC = 36 s.
Date 2015/16 0h UTC DEC 28 JAN 2 JAN 7 JAN 12 JAN 17 JAN 22 JAN 27 Uncertainty/ns Notes
MJD 57384 57389 57394 57399 57404 57409 57414 uA uB u
Laboratory k [UTC-UTC(k)]/ns
AOS (Borowiec) -2.0 -2.0 -1.6 -0.7 0.2 0.8 1.3 0.3 7.1 7.1
APL (Laurel) 0.1 1.5 2.2 2.1 2.0 2.5 2.1 0.3 10.9 10.9
AUS (Sydney) -207.5 -181.0 -162.8 -139.1 -127.1 -104.5 -77.0 0.3 5.5 5.5
BEV (Wien) 10.3 2.1 -15.2 -21.7 -3.1 6.3 21.6 0.3 4.3 4.3
BIM (Sofiya) 3206.9 3248.9 3292.6 3315.1 3342.5 3387.5 3414.4 1.5 8.7 8.8
BIRM (Beijing) -30.9 -40.6 -44.7 -45.0 -55.3 -49.5 -54.7 1.5 20.0 20.1
BY (Minsk) 7.4 6.9 5.6 5.4 2.0 2.8 4.0 1.5 8.7 8.8
CAO (Cagliari) -10117.0 -10223.6 -10325.0 -10424.9 -10531.3 -10636.4 -10748.3 8.0 20.0 21.6
CH (Bern-Wabern) 6.4 9.5 6.7 0.7 -5.5 -9.9 -3.5 0.3 1.4 1.5
CNM (Queretaro) -0.4 -1.6 -1.6 1.5 3.5 4.0 5.5 3.0 11.2 11.5
CNMP (Panama) -0.2 -18.1 -11.0 -18.9 -20.6 7.3 34.4 3.5 11.2 11.8
DFNT (Tunis) 17350.6 17541.7 17744.1 17941.0 18133.0 18320.4 18512.8 0.7 20.0 20.0
DMDM (Belgrade) -17.3 -30.2 -33.6 -19.7 -8.1 -12.3 6.7 0.3 7.4 7.4
DTAG (Frankfurt/M) 179.3 178.1 172.5 176.7 174.5 177.2 182.8 0.3 7.7 7.7
EIM (Thessaloniki) 4.1 1.2 - - 18.9 13.1 -2.6 7.5 7.9 10.9
ESTC (Noordwijk) 1.3 1.8 2.1 2.2 2.1 1.3 -0.3 0.3 5.5 5.5
HKO (Hong Kong) 50.4 48.4 53.6 64.4 61.4 71.0 83.6 0.3 7.4 7.4
IFAG (Wettzell) -864.7 -868.1 -857.1 -859.4 -856.0 -866.7 -862.4 0.3 5.4 5.4
IGNA (Buenos Aires) - - - - - - -
IMBH (Sarajevo) 297.9 290.0 270.7 261.1 261.3 249.2 242.3 0.3 7.1 7.1
INPL (Jerusalem) 158.5 166.4 166.3 172.3 168.9 170.8 181.1 0.7 7.8 7.8
INTI (Buenos Aires) -74.8 -70.4 -71.1 -63.3 -70.0 -62.5 -59.0 2.5 20.0 20.2
INXE (Rio de Janeiro) -11.5 -11.9 -15.6 -9.0 -5.0 -3.0 0.1 0.3 20.0 20.0
IT (Torino) 3.7 3.0 2.5 2.1 1.5 0.6 0.5 0.3 1.4 1.4
JATC (Lintong) 0.6 2.4 3.1 5.3 4.1 2.6 0.1 0.4 12.3 12.3
JV (Kjeller) -50.9 -54.5 -54.4 -51.4 -47.6 -47.1 -48.0 0.3 20.0 20.0
KEBS (Nairobi) 1659.1 1867.7 2094.3 2333.2 2556.8 2791.9 3013.9 1.5 20.0 20.1
KIM (Serpong-Tangerang) 1056.4 1074.8 1079.4 1093.8 1122.2 1114.2 1114.9 2.0 20.0 20.1
KRIS (Daejeon) 3.3 4.1 5.2 6.8 8.7 11.2 13.2 0.3 11.1 11.1
KZ (Astana) -500.2 -493.5 -497.2 -484.9 -486.3 -478.9 -477.1 1.5 8.6 8.8
LT (Vilnius) 1215.6 1204.2 1204.8 1215.4 1192.2 1184.0 1188.1 2.0 7.9 8.1
MASM (Bayanzurkh) - - - - - - -
MBM (Podgorica) 1070.7 1385.2 1670.0 1986.2 2280.6 - -240.8 5.0 20.0 20.6
MIKE (Espoo) 3.3 3.3 4.5 5.9 5.0 5.0 4.6 0.3 7.6 7.6
MKEH (Budapest) -40008.6 -40203.7 -40404.0 -40597.6 -40805.3 -41013.0 -41208.0 1.5 20.0 20.1
MSL (Lower Hutt) - - - - - - -
MTC (Makkah) 351.3 364.6 365.2 368.3 372.2 380.0 381.8 0.3 7.2 7.2
NAO (Mizusawa) 7.1 -0.5 7.5 13.3 14.5 14.3 14.4 2.0 20.0 20.1
NICT (Tokyo) 14.6 16.4 15.6 14.3 11.7 10.5 10.2 0.3 2.1 2.1
NIM (Beijing) 1.7 0.8 0.4 0.1 0.1 -0.6 -1.6 0.3 2.2 2.2
NIMB (Bucharest) 1222.3 1221.0 1230.9 1210.4 1220.5 1232.8 1217.1 0.3 20.0 20.0
NIMT (Pathumthani) -25.9 -1.0 44.2 77.0 99.4 83.4 65.4 1.0 20.0 20.0
NIS (Cairo) - -4.1 87.2 171.5 265.4 357.0 440.3 1.6 20.0 20.1
NIST (Boulder) 3.1 1.7 -0.6 -3.0 -5.6 -7.4 -7.9 0.3 5.0 5.0
NMIJ (Tsukuba) 7.9 6.6 4.6 3.4 3.4 2.8 2.2 0.3 2.2 2.2
NMLS (Sepang) -213.2 -209.3 -211.9 -216.0 -225.3 -234.1 -243.1 1.0 20.0 20.1
NPL (Teddington) -0.4 -1.1 -2.4 -4.6 -3.9 -1.2 0.5 0.3 7.3 7.3
NPLI (New-Delhi) -23.1 -25.7 -22.2 -15.8 -6.9 -0.1 4.3 0.3 20.0 20.0
NRC (Ottawa) 70.5 74.7 70.8 77.6 78.6 77.7 69.9 0.7 11.2 11.2
NRL (Washington DC) 5.0 4.9 4.7 4.6 10.1 11.0 10.0 0.3 20.0 20.0
NTSC (Lintong) -1.0 -0.1 2.4 2.9 2.4 -0.2 -0.5 0.3 10.7 10.7
ONBA (Buenos Aires) - -2881.2 -2903.3 -2898.8 -2905.9 -2924.0 -2929.3 2.5 11.2 11.5
ONRJ (Rio de Janeiro) 2.4 1.9 1.3 0.1 -1.9 -0.1 -0.6 1.3 7.2 7.4
OP (Paris) 0.3 0.0 0.2 0.8 0.8 0.6 0.9 0.3 1.4 1.4
ORB (Bruxelles) -0.1 -0.3 -1.9 -3.0 -4.3 -6.2 -7.4 0.3 5.5 5.5
PL (Warszawa) -18.9 -22.0 -24.0 -23.9 -13.8 -3.6 2.6 0.3 6.4 6.4
PTB (Braunschweig) 2.6 2.4 2.5 3.0 2.9 2.9 2.8 0.1 1.0 1.0
ROA (San Fernando) 0.8 0.5 2.8 6.8 7.8 8.3 5.1 0.5 1.7 1.8
SASO (Riyadh) -270.2 -280.3 -278.5 -274.2 -280.6 -276.8 -276.8 0.7 7.3 7.4
SCL (Hong Kong) -102.4 -107.3 -103.4 -111.0 -117.4 -114.4 -101.7 6.0 14.1 15.4
SG (Singapore) 10.3 10.0 12.7 9.8 10.1 9.3 4.1 0.7 5.8 5.9
SIQ (Ljubljana) -1441.4 -1442.9 -1452.4 -1449.3 -1439.9 -1458.4 -1441.5 0.3 7.2 7.2
SMD (Bruxelles) 14.6 9.0 6.6 10.6 10.9 10.8 11.0 0.3 7.4 7.4
SMU (Bratislava) -551.1 -559.8 -554.2 -554.2 -572.2 -570.4 -583.3 1.0 9.3 9.3
SP (Boras) 4.0 3.3 2.6 1.2 -0.2 -1.3 -3.0 0.3 1.4 1.4
SU (Moskva) 0.7 0.3 -0.3 0.2 0.4 1.1 1.6 0.9 6.6 6.7
TL (Chung-Li) 5.7 6.0 6.7 7.9 8.7 9.1 8.4 0.3 2.2 2.2
TP (Praha) -34.8 -37.0 -40.8 -38.1 -37.0 -31.4 -31.9 0.3 5.9 5.9
UA (Kharkov) -36.4 -22.0 -11.9 -9.7 -11.2 -9.8 -2.0 1.5 8.2 8.3
UME (Gebze-Kocaeli) 48.4 62.0 68.8 71.5 85.9 94.5 105.4 0.5 7.3 7.4
USNO (Washington DC) 1.4 1.9 2.2 2.1 1.9 1.1 0.3 0.2 1.2 1.2
VMI (Ha Noi) 30.9 4.5 12.3 10.0 0.6 -21.4 -22.2 2.0 20.0 20.1
VSL (Delft) 8.4 13.5 9.0 9.4 12.0 11.7 11.0 0.3 1.4 1.5
ZA (Pretoria) 1970.6 1916.1 1885.0 1843.8 1804.5 1769.4 1741.4 0.3 20.0 20.0

2 - Difference between the normalized frequencies of EAL and TAI.
Interval of validity f(EAL)-f(TAI)
Steering correction 57384 - 57414 6.483x10-13 (2015 DEC 28 - 2016 JAN 27)
New correction 57414 - 57444 6.483x10-13 (2016 JAN 27 - 2016 FEB 26)
New correction foreseen 57444 - 57474 6.483x10-13 (2016 FEB 26 - 2016 MAR 27)

3 - Duration of the TAI scale interval d.

Table 1: Estimate of d by individual PSFS measurements and corresponding uncertainties.
All values are expressed in 10-15 and are valid only for the stated period of estimation.
Standard Period of d uA uB ul/lab ul/Tai u uSrep Ref(uS) Ref(uB) uB(Ref) Note
Estimation
PTB-CS1 57384 57414 -12.55 6.00 8.00 0.00 0.07 10.00 PFS/NA T148 8. (1)
PTB-CS2 57384 57414 0.68 3.00 12.00 0.00 0.07 12.37 PFS/NA T148 12. (1)
IT-CsF2 57404 57414 -0.23 0.61 0.17 0.10 0.53 0.83 PFS/NA T315 0.19 (2)
SYRTE-FORb 57389 57409 -0.22 0.20 0.35 0.11 0.28 0.50 1.3 [1] T301 0.32 (3)
SYRTE-FO2 57394 57414 -0.48 0.25 0.35 0.12 0.28 0.53 PFS/NA T301 0.23 (3)
PTB-CSF1 57369 57384 -0.25 0.10 0.70 0.01 0.12 0.72 PFS/NA T162 1.40 (4)
PTB-CSF2 57379 57389 -0.52 0.21 0.22 0.07 0.18 0.36 PFS/NA T287 0.41 (4)
PTB-CSF1 57384 57404 -0.46 0.09 0.70 0.02 0.09 0.71 PFS/NA T162 1.40 (4)
SU-CsFO2 57384 57414 -0.05 0.27 0.25 0.11 0.59 0.70 PFS/NA T315 0.50 (5)

Notes:
(1) Continuously operating as a clock participating to TAI
(2) Report 04 FEB. 2016 by INRIM
(3) Report 29 JAN. 2016 by LNE-SYRTE
(4) Report 01 FEB. 2016 by PTB
(5) Report 29 JAN. 2016 by SU
[1] CIPM Recommendation 1 (CI-2013) : Updates to the list of standard frequencies in Proces-Verbaux
des Seances du Comite International des Poids et Mesures, 102nd meeting (2013), 2014, 188 p.

Table 2: Estimate of d by the BIPM based on all based on all PSFS measurements over the period MJD
57024-57414, and corresponding uncertainties.

Period of estimation d u
57384-57414 -0.31x10-15 0.28x10-15 (2015 DEC 28 - 2016 JAN 27)

4 - Relations of UTC and TAI with predictions of UTC(k) disseminated by GNSS.

[UTC-UTC(USNO)_GPS] = C0', [TAI-UTC(USNO)_GPS] = 36 s + C0'
[UTC-UTC(SU)_GLONASS]= C1', [TAI-UTC(SU)_GLONASS]= 36 s + C1'

For this edition of circular, σ0'= 0.9 ns, σ1'= 6.5 ns

2015/16 0h UTC MJD C0'/ns N0 C1'/ns N1'
DEC 28 57384 2.2 89 197.0 84
DEC 29 57385 3.8 89 198.9 86
DEC 30 57386 3.1 90 202.7 87
DEC 31 57387 3.1 89 208.2 81
JAN 1 57388 2.8 89 210.8 87
JAN 2 57389 1.7 89 211.2 77
JAN 3 57390 5.1 90 213.5 88
JAN 4 57391 4.6 89 218.7 88
JAN 5 57392 3.6 89 224.7 83
JAN 6 57393 4.3 89 227.0 89
JAN 7 57394 4.1 89 229.2 84
JAN 8 57395 3.6 89 232.5 83
JAN 9 57396 5.1 89 233.7 87
JAN 10 57397 3.9 89 230.8 76
JAN 11 57398 3.0 89 225.6 85
JAN 12 57399 3.8 89 222.9 87
JAN 13 57400 4.1 89 223.0 88
JAN 14 57401 3.5 89 226.2 89
JAN 15 57402 3.6 83 229.3 90
JAN 16 57403 3.4 89 228.2 85
JAN 17 57404 4.1 89 229.7 88
JAN 18 57405 3.8 89 232.5 82
JAN 19 57406 3.3 90 233.4 83
JAN 20 57407 3.7 88 234.0 89
JAN 21 57408 3.3 89 233.2 87
JAN 22 57409 3.3 89 228.6 89
JAN 23 57410 3.3 90 227.3 90
JAN 24 57411 1.8 88 232.2 83
JAN 25 57412 1.1 89 236.5 88
JAN 26 57413 3.1 89 240.9 82
JAN 27 57414 3.4 90 244.8 84

5 - Time links used for the computation of TAI, calibrations information and corresponding uncertainties.

Link Type Equipment Cal_ID1 / Cal_ID2 uStb/ns uCal/ns uAg/ns Al/ns YYMM
AOS /PTB GPSPPP AO_4 /PT02 2011-2014 / 1001-2014 0.3 7.0 0
APL /PTB GPSPPP AP__ /PT02 NA_Al / 1001-2014 0.3 11.2 10 24.3 1511
AUS /PTB GPSPPP AU01 /PT02 1002-2010 / 1001-2014 0.3 5.4 2
BIM /PTB GPS MC BM37 /PT05 2004-2008 / 1005-2008 1.5 8.6 5
BIRM/PTB GPS MC BI01 /PT05 NC_Al / 1005-2008 1.5 20.0 -30.0 0709
BY /PTB GPS MC BY__ /PT05 NA_Al / 1005-2008 1.5 8.6 5 53.0 0804
CAO /PTB GPS MC CA__ /PT05 NC / 1005-2008 8.0 20.0
CNM /PTB GPS MC CN00 /PT05 NA_Al / 1005-2008 3.0 11.2 10 -27.3 0804
CNMP/PTB GPS MC MP__ /PT05 1002-2004 / 1005-2008 3.5 11.2 10
DFNT/PTB GPS P3 DN__ /PT02 NC_Al / 1001-2014 0.7 20.0 10.3 1507
DMDM/PTB GPSPPP ZM68 /PT02 NA / 1001-2014 0.3 7.3 2
DTAG/PTB GPSPPP DT01 /PT02 NA / 1001-2014 0.3 7.6 3
EIM /PTB GPS MC EI__ /PT05 1011-2007 / 1005-2008 7.5 7.8 6
ESTC/PTB GPSPPP ES03 /PT02 1012-2012 / 1001-2014 0.3 5.4 2
HKO /PTB GPSPPP HKO1 /PT02 NA_Al / 1001-2014 0.3 7.3 2 +15.9 1304
IFAG/PTB GPSPPP IF13 /PT02 1011-2011 / 1001-2014 0.3 5.4 2
IGNA/PTB NL
IMBH/PTB GPSPPP BH01 /PT02 NA_Al / 1001-2014 0.3 7.0 0 31.6 1505
INPL/PTB GPS P3 IL02 /PT02 NA_Al / 1001-2014 0.7 7.7 3 -46.8 1212
INTI/PTB GPS MC IN__ /PT05 NC / 1005-2008 2.5 20.0
INXE/PTB GPSPPP NXRA /PT02 NC / 1001-2014 0.3 20.0
JV /PTB GPSPPP JV__ /PT02 NC_Al / 1001-2014 0.3 20.0 130.0 1509
KEBS/PTB GPS MC KE__ /PT05 NC / 1005-2008 1.5 20.0
KIM /PTB GPS MC KI02 /PT05 NC_Al / 1005-2008 2.0 20.0 -30.6 0901
KRIS/PTB GPSPPP KRZ1 /PT02 1003-2005 / 1001-2014 0.3 11.2 10
KZ /PTB GPSGLN KZ01 /PT05 2002-2008 / 1005-2008 1.5 8.6 5
LT /PTB GPS MC LT01 /PT05 1007-2006 / 1005-2008 2.0 7.8 6
MASM/PTB NL
MBM /PTB GPS MC ME__ /PT05 NC / 1005-2008 5.0 20.0
MIKE/PTB GPSPPP MI02 /PT02 NA / 1001-2014 0.3 7.6 3
MKEH/PTB GPS MC MK01 /PT05 NC / 1005-2008 1.5 20.0
MSL /PTB NL
MTC /PTB GPSPPP MC02 /PT02 NA_Al / 1001-2014 0.3 7.1 1 32.6 1503
NAO /PTB GPS MC NA__ /PT05 NC / 1005-2008 2.0 20.0
NICT/PTB GPSPPP NC01 /PT02 1001-2014 / 1001-2014 0.3 2.0 1
NIM /PTB GPSPPP IM06 /PT02 1001-2014 / 1001-2014 0.3 2.0 1
NIMB/PTB GPSPPP MB02 /PT02 NC / 1001-2014 0.3 20.0
NIMT/PTB GPS P3 MTTO /PT02 NC / 1001-2014 1.0 20.0
NIS /PTB GPS P3 IS_1 /PT02 NC_Al / 1001-2014 1.6 20.0 +16.4 1303
NMIJ/PTB GPSPPP NM0D /PT02 NA_Al / 1001-2014 0.3 2.0 1
NMLS/PTB GPS P3 LSM1 /PT02 NC_Al / 1001-2014 1.0 20.0 +3.3 1311
NPL /PTB GPSPPP NP11 /PT02 NA_Al / 1001-2014 0.3 7.3 2 +2.2 1108
NPLI/PTB GPSPPP LITF /PT02 NC / 1001-2014 0.3 20.0
NRC /PTB GPS P3 NR1C /PT02 1001-2003 / 1001-2014 0.7 11.2 10
NRL /PTB GPSPPP RL__ /PT02 NC / 1001-2014 0.3 20.0
NTSC/PTB GPSPPP NTP1 /PT02 NC / 1001-2014 0.3 11.2 10
ONBA/PTB GPS MC ON__ /PT05 1002-2004 / 1005-2008 2.5 11.2 10
ONRJ/PTB GPS P3 RJ01 /PT02 NA_Al / 1001-2014 1.3 7.3 2 +5.6 1302
ORB /PTB GPSPPP OR1Z /PT02 1001-2012 / 1001-2014 0.3 5.4 2
PL /PTB GPSPPP PL_3 /PT02 NA_Al / 1001-2014 0.3 6.4 4
SASO/PTB GPS P3 SA00 /PT02 NA_Al / 1001-2014 0.7 7.3 2 32.8 1312
SCL /PTB GPS MC SC__ /PT05 1001-1993 / 1005-2008 6.0 14.1 10
SG /PTB GPS P3 SGBK /PT02 1001-2010 / 1001-2014 0.7 5.8 3
SIQ /PTB GPSPPP SI01 /PT02 2002-2014 / 1001-2014 0.3 7.1 1
SMD /PTB GPSPPP SD21 /PT02 2002-2011 / 1001-2014 0.3 7.3 2
SMU /PTB GPSGLN SM00 /PT05 2001-2006 / 1005-2008 1.0 9.2 6
SU /PTB GPSGLN SU26 /PT05 0281-2012 / 1005-2008 1.0 7.1 5
TL /PTB GPSPPP TLT1 /PT02 NA_Al / 1001-2014 0.3 2.0 1
TP /PTB GPSPPP TP04 /PT02 1002-2009 / 1001-2014 0.3 5.8 3
UA /PTB GPS MC UA04 /PT05 2003-2011 / 1005-2008 1.5 8.1 4
UME /PTB GPSPPP UM01 /PT02 NA_Al / 1001-2014 0.5 7.3 2 25.4 1507
VMI /PTB GPS P3 VM__ /PT02 NC / 1001-2014 2.0 20.0
ZA /PTB GPSPPP ZA__ /PT02 NC / 1001-2014 0.3 20.0
Link Type Equipment Cal_ID uStb/ns uCal/ns uAg/ns Al/ns YYMM
BEV /PTB GPSPPP BE1_ /PT02 NA_Al 0.3 4.2 3 -3.2 1203
CH /PTB TWGPPP CH01 /PTB01 0284-2012 0.3 1.0 0
IT /PTB TWGPPP IT02 /PTB01 0374-2014 0.3 1.0 0
JATC/NTSC INT LK INTDLY 0.2 6.1 6
NIST/PTB TWGPPP NIST01/PTB01 0214-2011 0.3 5.1 1
OP /PTB TWGPPP OP01 /PTB01 0377-2014 0.3 1.0 0
ROA /PTB TWSTFT ROA01 /PTB01 NA_Al 0.5 1.4 0
SP /PTB TWGPPP SP01 /PTB01 0381-2014 0.3 1.0 0
USNO/PTB TWGPPP USNO01/PTB01 0392-2015 0.3 1.0 0
VSL /PTB TWGPPP VSL01 /PTB01 0295-2015 0.3 1.0 0