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We present optical photometric and spectroscopic observations of thefaint-and-fast evolving type Iax SN 2019gsc, extending from the time of g-bandmaximum until about fifty days post maximum, when the object faded to anapparent r-band magnitude m_r = 22.48+/-0.11 mag. SN 2019gsc reached a peakluminosity of only M_g = -13.58 +/- 0.15 mag, and is characterised with apost-maximum decline rate Delta(m_15)_g = 1.08 +/- 0.14 mag. These light curveparameters are comparable to those measured for SN 2008ha of M_g = -13.89 +/-0.14 mag at peak and Delta(m_15)_g = 1.80 +/- 0.03 mag. The spectral featuresof SN 2019gsc also resemble those of SN 2008ha at similar phases. This includesboth the extremely low ejecta velocity at maximum, about 3,000 km/s, and atlate-time (phase +54 d) strong forbidden iron and cobalt lines as well as bothforbidden and permitted calcium features. Furthermore, akin to SN 2008ha, thebolometric light curve of SN 2019gsc is consistent with the production of 0.003+/- 0.001 Msol of nickel. The explosion parameters, M_ej = 0.13 Msol and E_k =12 x 10E48 erg, are also similar to those inferred for SN 2008ha. We estimate asub-solar oxygen abundance for the host galaxy of SN 2019gsc, (12 + log10(O/H)= 8.10 +/- 0.18 dex), consistent with the equally metal-poor environment of SN2008ha. Altogether, our dataset of SN 2019gsc indicates that this is a memberof a small but growing group of extreme SN Iax that includes SN 2008ha and SN2010ae.

Observations of the low-luminosity Type Iax supernova 2019gsc: a fainter clone of SN 2008ha?