[IAUC] IAUC 8829: GW Lib; 2007av-2007bd [25139-2007/05-R1]
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Circular No. 8829
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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GW LIBRAE
E. O. Waagen, AAVSO, reports that this apparent WZ Sge-type
cataclysmic variable is in outburst for the first time since its
discovery in 1983 (cf. IAUC 3854). Selected visual magnitude
estimates (see also CBET 922): Apr. 12.126 UT, [12.0 (P. Schmeer,
Bischmisheim, Germany); 12.494, 13.8 (R. Stubbings, Drouin, Vic.,
Australia); 12.569, 13.4 (A. Pearce, Nedlands, W. Australia;
revision to CBET 922); 12.617, 12.5 (Pearce; revision to CBET 922);
12.659, 11.8 (Stubbings); 12.853, 9.9 (Pearce).
SUPERNOVAE 2007av-2007bd
Several supernovae have been discovered on unfiltered CCD
frames: 2007av and 2007ax by R. Arbour (cf. IAUC 8496); and the
rest by W. Li (LOSS/KAIT; cf. IAUC 8822; with R. Mostardi for
2007aw and 2007ay, with D. Winslow for 2007az and 2007ba, with N.
Joubert for 2007bb, and with R. Prasad for 2007bc and 2007bd).
Discovery observations:
SN 2007 UT R.A. (2000.0) Decl. Mag. Offset
2007av Mar. 20.84 10 34 43.17 +11 11 38.3 15.5 5".9 E, 14".9 S
2007aw Mar. 22.26 9 57 24.16 -19 21 23.1 18.1 3".3 E, 5".2 S
2007ax Mar. 21.98 8 22 43.26 +22 33 16.9 17.2 2".6 W, 5".5 N
2007ay Mar. 22.21 8 17 14.85 + 1 12 06.9 17.1 12".7 W, 16".4 S
2007az Mar. 6.27 8 25 23.80 +69 54 29.4 18.9 --
2007ba Mar. 29.49 15 16 42.63 + 7 23 47.8 18.2 11".5 E, 0".9 S
2007bb Apr. 2.15 7 01 07.46 +51 15 57.3 17.2 22".3 E, 14".0 S
2007bc Apr. 4.32 11 19 14.57 +20 48 32.5 16.1 29".2 W, 16".5 S
2007bd Apr. 4.18 8 31 33.28 - 1 11 58.0 18.4 7".6 E, 5".1 N
Additional information is available on Electronic Telegrams:
2007av in NGC 3279, CBETs 901 and 903 (type-II, discovered close to
explosion time); 2007aw in NGC 3072, CBETs 902 and 908 (type-Ic,
discovered a few days after maximum); 2007ax in NGC 2577, CBETs 904,
907, and 908 (subluminous type-Ia, discovered several days before
maximum); 2007ay in UGC 4310, CBETs 905 and 908 (type-II,
discovered shortly after explosion time); 2007az, CBETs 872 and 909
(type-Ib, discovered shortly before maximum); 2007ba in UGC 9798,
CBETs 911 and 918 (type-Ia, discovered well before maximum); 2007bb
in UGC 3627, CBETs 912 and 916 (type-IIn, discovered just after
explosion); 2007bc in UGC 6332, CBETs 913 and 915 (type-Ia,
discovered several days before maximum); 2007bd in UGC 4455, CBETs
914 and 915 (type-Ia, discovered > 1 week before maximum).
(C) Copyright 2007 CBAT
2007 April 13 (8829) Daniel W. E. Green
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