2008CBET.1319....2P -
Central Bureau Electronic Telegrams, 1319, 2 (2008/March-0)
Supernova 2008bk in NGC 7793.
PIGNATA G., MAZA J., HAMUY M., ANTEZANA R., GONZALEZ L., GONZALEZ P., LOPEZ P., SILVA S., FOLATELLI G., REICHART D., IVARSEN K., CRAIN A., FOSTER D., NYSEWANDER M., LACLUYZE A. and LI W.
Abstract (from CDS):
Li et al. have further applied their astrometric solution to deep archival ground-based images taken with the Very Large Telescopes (VLT). Within the uncertainty of the solution (0".2 error radius), they identified a single point source on an I-band image taken on 2001 Sept. 16 UT, which Li et al. propose as the possible progenitor for SN 2008bk. The source is not detected in the B- and V-band images, so it is a red source [likely a red supergiant (RSG) star]. The possible progenitor of 2008bk also resides in a cluster of bright blue and red supergiant stars. Based on the environment of SN 2008bk and its possible progenitor identification, Li et al. postulate that 2008bk is a core collapse (likely a type-II) event. Further analysis on the astrometry and photometry of the progenitor star is on-going. A finder chart for the possible progenitor can be found at the following website URL:
http://astro.berkeley.edu/~weidong/sn2008bk.vlt-prog.gif G. Pignata, J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, P. Gonzalez, P. Lopez, S. Silva, and G. Folatelli, Universidad de Chile; and D. Reichart, K. Ivarsen, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on the behalf CHASE project, report that images taken with the "PROMPT2" and "PROMPT4" telescopes yield the following magnitudes (± 0.05) for 2008bk: Mar. 28.41 UT, B = 12.78, V = 13.05 (indicating B-V = -0.27); Mar. 29.40, B = 12.79, V = 13.02. The calibration star is listed in the Tycho-2 catalogue (at R.A. = 23h57m53s.03, Decl. = -32o32'42".9; B = 12.499, V = 12.476).
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