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Swift UVOT Observations show SN Ia 2018aoz/DLT18q is UV-bright

ATel #11511; Peter Brown (Texas A&M), David Sand (Arizona)
on 6 Apr 2018; 22:40 UT
Credential Certification: Peter J. Brown (grbpeter@yahoo.com)

Subjects: Optical, Ultra-Violet, Supernovae

SN2018aoz/DLT18q was discovered by the DLT40 supernova search and classified as a young Ia (ATEL #11496). It was observed by the Neil Gehrels Swift Observatory beginning 2018-04-03 13:56:50. The SN has continued to brighten in all 6 Swift/UVOT filters. The magnitudes below are from summed images from the latest set of observations. These magnitudes were reduced using the method outlined for the Swift Optical Ultraviolet Supernova Archive (SOUSA) on the Swift/UVOT Vega-based photometric system (Poole et al. 2008, Breeveld et al. 2011). They have not been corrected for galaxy contamination or dust reddening.

Filter MJD Mag MagErr
UVW2 58214.38 15.49 0.06
UVM2 58214.38 16.15 0.06
UVW1 58214.37 13.89 0.05
U 58214.38 12.80 0.04
B 58214.38 13.57 0.04
V 58214.38 13.55 0.04
The UV-optical colors (including the mid and near-UV ranges) are quite blue compared to normal type Ia supernova, most similar to those of Super-Chandrasekhar candidates (Brown et al. 2014), SN2004dt (Wang et al. 2012), or the UV-brightest SN Ia 2011de (Brown 2014). These objects still have a sharp drop in flux shortward of 3000 Angstroms; thus the characterization as "UV-bright" could be more appropriately described as "not as catastrophically UV-faint as normal SNe Ia." We encourage further observations.

These observations were triggered as part of a Swift GI program: SUPERNOVA KEY PROJECT: SWIFT RESPONSE TO NEARBY SUPERNOVAE. We thank the Swift team for the scheduling of these observations.

Swift UVOT light curve of SN2018aoz