A Supernova in a Magnified Multiply Imaged Galaxy at Redshift z=1.76

ATel #15463; Patrick Kelly (UMN), Wenlei Chen (UMN), Masamune Oguri (Chiba), Adi Zitrin (Ben Gurion), Jose M. Diego (Cantabria), Alex Filippenko (UCB), Tommaso Treu (UCLA), Saurabh Jha (Rutgers), Ryan J. Foley (UCSC), Thomas Broadhurst (Basque Country), Anton Koekemoer (STScI)
on 24 Jun 2022; 01:14 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Patrick Kelly (plkelly@umn.edu)

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We report the detection of a supernova candidate in a galaxy at redshift z=1.76 that is multiply imaged by foreground RX J1347-1145 (z=0.451) galaxy cluster. We found the transient, which should have a magnification of ~4, in imaging taken by the Hubble Space Telescope SNAP GO-16279 program, which is searching for microlensing events of high-redshift magnified stars. In a visit to the field on May 30th, we detect a source with F110W = 25.8+-0.3 mag, with no detection in F606W. No transient is detected in imaging from a previous visit to the field by the program on May 18th. The SN may reappear in ~9.5 years in a pair of highly magnified images of its host galaxy, if it is located in the multiply imaged region of the galaxy. An HST Director’s Discretionary program has been approved to measure its light curve, and acquire WFC IR G102 grism spectroscopy. If a Type Ia SN with minimal extinction, it should reach a peak AB magnitude of F110W~23.8 in early July. Coordinates: 13:47:31.8180 -11:45:51.914 Ground-based follow-up is encouraged, and here is a link to a finder chart: https://drive.google.com/file/d/1PQtqV4g8exBuvBA55R9_L42R9wnM7z3x/view?usp=sharing

Finder Chart