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SWIFT observation of SN 2006at

ATel #761; P. J. Brown, Pennsylvania State University, and S. Immler, Goddard Space Flight Center, NASA, and Universities Space Research Association, on behalf of the Swift-satellite team
on 11 Mar 2006; 06:31 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefan Immler (immler@milkyway.gsfc.nasa.gov)

Subjects: Optical, Ultra-Violet, X-ray, Supernovae

Referred to by ATel #: 771

We report on Swift Ultraviolet/Optical Telescope (UVOT) and X-Ray Telescope (XRT) observations of SN 2006at (Dintinjana & Mikuz 2006 CBET #434) obtained on 2006-3-10.63 UT.

UVOT magnitudes are V = 17.5 ± 0.2, B = 18.0 ± 0.3, U = 16.7 ± 0.2, UVW1 [181-321 nm] = 17.1 ± 0.2, UVM2 [166-268 nm] = 17.6 ± 0.2, and UVW2 [112-264 nm] = 17.8 ± 0.2. The blue continuum reported by Yamaoka, Naito & Tokimasa (2006 CBET #434) continues into the UV. Comparing the U-B and B-V colors with other SNe from Poznanski et al. (2002, PASP, 114, 833), the U-B color is about one magnitude bluer than observed in the displayed SNe. The UV colors are much bluer than SNe Ia observed with Swift UVOT but comparable to early observations of the type II-P SN2005cs (Brown et al. in prep.).

No X-ray source is detected at the position of SN 2006at in a simultaneous 1,480 s XRT observation. The 3-sigma upper limit to the count rate is 6.2E-03 cts/s, corresponding to an unabsorbed (0.2-10 keV) X-ray flux of 3.3E-13 ergs/cm/cm/s for an assumed thermal plasma spectrum with a temperature of 10 keV and an absorbing foreground column density of 1.87E+20 cm**-2 (Dickey & Lockman 1990, ARAA 28, 215).

Further Swift observations are scheduled.

Swift UVOT finding chart