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THE ASTRONOMER Electronic Circular No 2373      2007 Sep 07 11.11UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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OJ287
Mark Kidger, TA Planetary Editor, reports that observations by Albert 
Sanchez (MPC 442, Barcelona, Spain) taken on 2007 September 06.1 and 
07.1 suggest that OJ287 is outbursting as predicted by the model of 
Valtonen et al.

The quasar was measured at R=13.92 on the former date and R=13.81 on the 
latter. The peak of the outburst seems to correspond very closely to the 
model prediction maximum around 2007 September 13.

Further observations would be welcomed.

SUPERNOVA 2007gp IN ANONYMOUS GALAXY
Discovery by the 'Nearby Supernova Factory' group of a possible 
supernova (CBET 1031):
SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2007gp  Aug  07.2   21 57 35.59  +08 00 47.3  20.5R    -      -
A spectrum of Aug 8.5 indicates it is of type Ia.

HS 2331+3905
Further to the note on E-Circular 2372, this object brightened 
substantially and Bjorn Granslo of Norway reports his visual estimate 
gave 8.5 on Sept 6.024UT using 7x50B. Comparison stars (V-magnitudes 
from TYC-2 w/Bessell): E = 8.15 [HD 221598]; F = 8.73 [HD 221025]. 
(NAS).
His images from Sep 5.0 UT and Sep 6.0 (Canon EOS 400D + 100-mm f/2.0):
http://folk.uio.no/bgranslo/images/HS2331_2007Sep05L.jpg
http://folk.uio.no/bgranslo/images/HS2331_2007Sep06L.jpg
NAS.VSS chart: http://folk.uio.no/bgranslo/charts/HS2331_c.gif

Martin Nicholson adds that his measure reported on TA E-Circular 2372 
was obtained during the brightening phase via the remote
link to New Mexico. See the following for a light curve:
http://tinyurl.com/2ltwwq

SUPERNOVA 2007gq IN NGC 4541
Discovery by Berto Monard, South Africa of a possible supernova (CBET 
1033):
SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2007gq  Aug 11.70   12 35 11.22  -00 13 21.6  16.6R   8  "E, 6  "S

SUPERNOVAE 2007gs, 2007gt, 2007gu, 2007gv
The "Nearby Supernova Factory" collaboration also report (CBET 1040) 
further discoveries of faint supernovae in images obtained during Aug. 
15-19 using the QUEST-II camera on the Palomar Oschin 1.2-m Schmidt 
telescope. R-band discovery magnitudes and astrometry were derived from 
comparison with the USNO-B1.0 catalogue.
SN       2007 UT       R.A. (2000.0) Decl.      Mag.    z      Type
2007gs   Aug. 15.3   22 12 00.43  + 7 31 49.3   18.5   0.04    II
2007gt   Aug. 16.3    0 16 26.16  - 0 21 09.2   18.5   0.06    Ia
2007gu   Aug. 16.3   22 53 42.55  +12 05 54.4   19.5   0.08    Ia
2007gv   Aug. 19.5    1 39 05.65  + 6 14 42.0   20.0   0.11    Ia

SUPERNOVA 2007gw IN NGC 4161
Discovery by Koichi Itagaki, Japan of a possible supernova (CBET 1042):
SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2007gw  Aug 24.48   12 11 34.60  +57 44 15.9  16.7    9.5"E, 1.0"N
Note the type-Ib supernova 2006dk also appeared in this galaxy.
Guy M Hurst