IAU Central Bureau for Astronomical Telegrams“The IAU Circulars (IAUCs), published by the Central Bureau for Astronomical Telegrams (CBAT), officially announce new discoveries of supernovae, novae, comets, satellites of major/minor planets, and other interesting transient astronomical objects (particularly those that are unusual, such as cataclysmic variables that have outbursts less frequently than once every year or two, or very unusual variable stars or non-stellar objects discovered at optical or non-optical wavelengths.”