IMSNG early detection of AT 2019ein/ATLAS19ieo
ATel #12720; Myungshin Im, Gu Lim, Gregory S.-H. Paek, Changsu Choi, (Seoul National University), Hyun-Il Sung (KASI), on behalf of the IMSNG team
on 3 May 2019; 05:15 UT
Credential Certification: Myungshin Im (myungshin.im@gmail.com)
Subjects: Optical, Supernovae, Transient
As a part of the Intensive Monitoring Survey of Nearby Galaxies (IMSNG; Im et al. 2019, JKAS, 52, 11), we have been doing daily monitoring the field including the location of AT 2019ein /ATLAS 19ieo (Tonry et al. 2019, TNSTR 33987). Our inspection of the R-band images taken at the Mt. Lemmon Optical Astronomy Observatory (LOAO) in Tucson, AZ, and the SNU Astronomical Observatory (SAO) 1m telescope reveals that the transient was not present in the SAO R-band image taken at 2019-04-29 18:07:15 (UT), but appeared in the LOAO B and R-band images taken at 2019-05-01 10:29:38 (UT) with the magnitude consistent with the early report (Smith et al. 2019, ATel #12710). This is about two hours before the first reported detection of AT2019ein by Smith et al (2019, ATel #12710). About 16.5 hours after, AT 2019ein brightened by 0.5 +- 0.1 magnitude in the R-band image taken by the SAO 1m telescope, consistent with the report that this is a very young supernova from spectroscopy (Burke et al. 2019, ATel #12719). Further observations are ongoing.
