Recrudescence of the "Unusually Persistent Transient" SDSS1133 as Seen in ASAS-SN Data

ATel #12794; K. Z. Stanek, C. S. Kochanek (OSU), D. Bersier (Liverpool), C. Basinger, J. V. Shields, T. A. Thompson (OSU), B. J. Shappee (IfA-Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus)
on 22 May 2019; 15:56 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

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During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014), using data from multiple ASAS-SN telescopes, we detect a transient source located in the z=0.008 dwarf galaxy UGCA 239 (Markarian 177). That transient source is consistent with SDSS J113323.97+550415.8, an "Unusually Persistent Transient" discussed in detail by Koss et al. (2014, MNRAS, 445, 515)

 
Object                     Detection UT Date   Detection g-mag  
SDSS J113323.97+550415.8   2019-05-22.16         17.6 

SDSS113 was automatically detected in ASAS-SN images obtained on UT 2019-05-22.16 at g~17.6 mag. It is also detected in a number of previous images, with the first detection on UT 2019-04-23.32 at g~18.4. We note that the Gaia mission has alerted the community about the brightening of SDSS113 via TNS as AT 2019fsw.

The current re-brightening of this very interesting source is similar in optical brightness to its high state observed by SDSS in 2001 and 2002 (Koss et al. 2014, Figures 1 and 2), and the object is raising in ASAS-SN g-band data. Follow-up observations, especially spectroscopy, are strongly encouraged.

We would like to 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).