SIMBAD references

B. Sugerman and M. Meixner, Space Telescope Science Institute; and J. Fabbri and M. Barlow, University College, London, report the detection of the type-IIn supernova 1999bw in archival Spitzer IRAC images of NGC 3198 obtained by the SINGS Legacy program on 2004 May 1.4 UT. A source was detected in all four IRAC bands at R.A. = 10h19m46s.80, Decl. = +45o31'35".4 (equinox 2000.0; ± 0".3 in each coordinate), in close agreement with the optical position (IAUC 7149). The measured flux densities (mJy) at 3.6, 4.5, 5.8, and 8.0 microns are 0.02 ± 0.01, 0.04 ± 0.01, 0.11 ± 0.02, and 0.19 ± 0.04, respectively. This rise is fitted by a 450-K blackbody with integrated flux 3.1 x 10**-13 erg cm**-2 s**-1, which, for a distance to NGC 3198 of 14.5 Mpc (Kelson et al. 1999, Ap.J. 514, 614), corresponds to a luminosity of 6.2 x 10**38 ergs s**-1 and a blackbody radius of 1.6 x 10**16 cm. This size is consistent with ejecta expanding at 1000 km/s in the five years since core collapse, suggesting the reported emission may be from dust that condensed within the ejecta. A convolved companion source is also detected, separated by 3".9 at p.a. 209 deg, with 3.6-, 4.5-, 5.8-, and 8.0-micron fluxes of 0.08 ± 0.01, 0.07 ± 0.01, 0.33 ± 0.04, and 0.88 ± 0.08 mJy, respectively.