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Swift/UVOT Observations of MASTER Transient in IC 2597

ATel #8201; Peter J. Brown (Mitchell Institute, Texas A&M University)
on 21 Oct 2015; 14:05 UT
Credential Certification: Peter J. Brown (grbpeter@yahoo.com)

Subjects: Optical, Ultra-Violet, Supernovae

Following the announcement of MASTER OT J103747.94-270507.2 in IC 2597 (Popova et al. 2015, ATEL#8196) we requested observations with Swift's Ultraviolet/Optical Telescope (UVOT). Observations began 2015-10-20 21:21:41 UT. The following UVOT magnitudes were measured: v = 16.76 +/- 0.15 (78 s exposure time), b = 18.10 +/- 0.18 (79 s), u = 18.40 +/- 0.25 (79 s), uvw1 > 19.3 (157 s), uvm2 >20.5 (1232 s), and uvw2 > 20.0 (315 s). These magnitudes are reduced using the method outlined for the Swift Optical Ultraviolet Supernova Archive (SOUSA; Brown et al 2014, Ap&SS, 354, 89, arXiv:1407.3808) on the Swift/UVOT Vega-based photometric system (Poole et al. 2008, Breeveld et al. 2011). Observations from 2008 were used to subtract the underlying galaxy flux. Swift previously observed the type Ia SN 2007cv in the elliptical galaxy IC 2597. The ubv magnitudes (and consequently the ubv absolute magnitudes and colors) are consistent with SN 2007cv at about 25 days after B-band maximum. Spectroscopic confirmation would still be desirable.

Swift Supernova Siblings