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UV/optical upper limits on PSN J12215513+0428169 in M61 from Swift

ATel #6016; Peter J. Brown (Mitchell Institute/Texas A&M)
on 27 Mar 2014; 18:43 UT
Credential Certification: Peter J. Brown (grbpeter@yahoo.com)

Subjects: Optical, Ultra-Violet, Supernovae, Transient

The Swift satellite started observing PSN J12215513+0428169 in M61 (as posted on the CBAT Transient Object Confirmation Page) at 2014-03-27.5 UT. No new source is significantly detected in observations with the Ultraviolet/Optical Telescope (UVOT). The host galaxy flux was subtracted using observations of M61/SN2008in taken between 2008-12-29 and 2009-02-22 (Roy et al. 2011, Pritchard et al. 2013). The UVOT observations yield the following upper limits: v > 17.4 (76 s), b > 18.4 (76 s), u > 18.4 (76 s), uvw1 > 18.5 (76 s), uvm2 > 19.3 (412 s), uvw2 > 18.5 (76 s). There is also nothing detected in pre-explosion UV images taken on 2014-03-20.8 yielding an upper limit of uvm2 > 19.8 (1146 s). These magnitudes are on the updated UVOT Vega photometric system (Breeveld et al. 2011, in AIP Conf. Ser. 1358, p. 373). The photometry has not been corrected for extinction.

Swift Supernovae