SIMBAD references

E. O. Waagen and A. Henden, AAVSO, report that GK Per has risen at least a half magnitude above its quiescent visual magnitude of about 13.1. Waagen notes that, after many years of quite-similar-looking outbursts about 1100-1300 days apart, rising to m_v about 10.1 in 24-30 days, and lasting 53-73 days, the last two outbursts were very different, with the Sept. 2004 outburst coming only 940 days after the preceding outburst, taking > 60 days to rise to a maximum of m_v = 10.6 and lasting about 100 days, and the Dec. 2006 outburst coming about 810 days later, rising only to m_v = 11.5 with oscillations to mag 12.2 before returning to minimum about 100 days after outburst. The current probable outburst is occurring about 1180 days after the last outburst. Close monitoring is very important and is strongly urged. Selected recent visual magnitude estimates of GK Per reported to the AAVSO: Mar. 1.860 UT, 13.0 (G. Poyner, Birmingham, England); 4.805, 13.0 (P. Schmeer, Bischmisheim, Germany); 5.014, 13.0 (M. Komorous, London, Ontario, Canada); 6.090, 12.8 (J. Bortle, Stormville, NY, U.S.A.); 6.801, 12.7 (Schmeer); 7.030, 12.6 (Bortle); 7.795, 12.4 (Schmeer); 7.839, 12.3 (Poyner); 8.020, 12.5 (Komorous); 8.026, 12.4 (Bortle). Photoelectric V-band magnitudes from E. van Ballegoij, Heesch, The Netherlands: Mar. 4.917, 13.03; 6.870, 12.34.