SIMBAD references

Precise astrometric data for M31N 2010-12b are tabulated below:

---------------------------------------------------------------------------— 2010 UT R.A. (2000.0) Decl. Mag. Observers ---------------------------------------------------------------------------— Dec. 10.359 0 42 31.07 +41 27 20.0 16.7 Yusa Dec. 10.515 0 42 31.07 +41 27 20.4 16.1 Gao Dec. 10.532 0 42 30.88 +41 27 21.7 16.0 Koishikawa Dec. 11.095 0 42 31.08 +41 27 20.3 16.6 Pietsch et al. Dec. 11.468 0 42 31.06 +41 27 20.5 17.4 Nishiyama, Kabashima Dec. 11.517 0 42 31.07 +41 27 20.4 17.7 Gao ---------------------------------------------------------------------------—

Additional limiting magnitudes for M31N 2010-12b: 1986 Nov. 27, [18.9 (Digitized Sky Survey; red plate; via Nishiyama and Kabashima); 1988 Nov. 27, [20.8 (DSS; red plate; via Sun and Gao); 1993 Oct. 21, [18.5 (DSS; infrared plate via Nishiyama and Kabashima); 2010 Dec. 5.213 UT, [19.0 (Pietsch et al.; R-band); 5.460, [20.0 (Nishiyama and Kabashima); 6.52, [19.0 (Sun and Gao); 8.376, [19.0 (Yusa); 8.508, [19 (Koishikawa); 9.464, [19.9 (Nishiyama and Kabashima).