Swift follow-up of SPIRITS16tn

ATel #9441; S. M. Adams, J. E. Jencson, and M. M. Kasliwal (Caltech) on behalf of the SPIRITS collaboration
on 31 Aug 2016; 21:14 UT
Credential Certification: Scott Adams (sma@astro.caltech.edu)

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We report Swift UVOT observations of SPIRITS16tn, a possible supernova in M108 (Jencson et al. ATel #9434). No source is detected in V, B, and U images taken on 2016-08-29.08 UT (14.0 days since SST discovery images) with exposure times of 540, 580, and 540s respectively. The 3-sigma limiting (Vega) magnitudes are V > 20.5, B > 20.8, and U > 20.5. These limits suggest that the event is heavily obscured. If the transient is a supernova, it must be extinguished by several magnitudes. We thank the Swift Team for rapid approval and scheduling of DDT observations.