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Improved Position and Additional Photometry for ASASSN-18bt, Bright Supernova in a Kepler Supernova Field

ATel #11259; R. Cornect (Moondyne Observatory), J. Brimacombe (Coral Towers Observatory), G. Stone (Sierra Remote Observatories), R. S. Post (Post Astronomy), J. S. Brown, K. Z. Stanek, C. S. Kochanek, P. Vallely, J. Shields, T. A. Thompson (Ohio State), B. J. Shappee (IfA-Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, S. Bose, Ping Chen (KIAA-PKU), M. Stritzinger, S. Holmbo (Aarhus), G. Bock (Runaway Bay Observatory, Australia), S. Kiyota (Variable Star Observers League in Japan)
on 5 Feb 2018; 20:01 UT
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Supernovae

We have obtained additional follow-up imaging, using several telescopes, of the nearby type Ia supernova ASASSN-18bt (ATEL #11253). This figure shows the archival SDSS g-band image of the host (left) and the R. Post confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the R. Post image. The updated position of the supernova is listed in the table below:

Object       RA (J2000)     DEC (J2000) 
ASASSN-18bt  09:06:39.592   +19:20:17.47 
We also report additional photometry from ASAS-SN telescopes "Payne-Gaposchkin" and "Leavitt":
Obs. UT Date         mag  (V/g) 
2018-02-04.90       14.97  (g) 
2018-02-05.29       14.89  (g) 

While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-18xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-18xx (AT 2018xyz) to preserve, rather than anonymize, the origin of the transient.

We thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grant GBMF5490 to the Ohio State University, NSF grant AST-1515927, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Chinese Academy of Sciences South America Center for Astronomy (CASSACA), and the Villum Fonden (Denmark). For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.