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IAUC 8829: GW Lib; 2007av-2007bd

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                                                  Circular No. 8829
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


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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