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THE ASTRONOMER Electronic Circular No 2740      2011 May 27 13.06UT
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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OT J210950.5+134840 (Itagaki)
It is reported on VSNET Alert 13341 that Itagaki-san has detected a 
likely dwarf nova in outburst. The object was at 11.5C mag on 2011 May 
24.69UT. The amplitude of the outburst is larger than 7 magnitudes, and 
it is likely to be a WZ Sge-type outburst.
The position, suggested by its temporary designation is:
RA 21h 09m 50.47s DEC +13 48'39.6" (2000)

Ernesto Guido and Giovanni Sostero have e-mailed TAHQ:
Following the posting on the Central Bureau's Transient Object 
Confirmation Page about the transient in Peg we performed some follow-up 
of this object remotely through a 0.25-m, f/3,4 reflector + CCD, from 
GRAS Observatory (near Mayhill, NM).

On our images taken on May 25.3, 2011 we can confirm  the presence of an 
optical counterpart with unfiltered CCD magnitude about 11.0 (USNO-B1.0 
Catalogue reference stars) at coordinates:
RA 21h 09m 50.46s DEC +13 48' 39.6" (2000); USNO-B1.0 catalogue 
reference stars.

According to VIZIER there is a 18.82 R2 magnitude star at 0.0099 arcmin 
from the transient position (USNO- B1.0 1038-0586809).

Our confirming image of this transient and an animation showing a 
comparison between our image and the archive POSS2/UKSTU plate (R Filter 
- 1991)is shown at:
http://bit.ly/mycwOt

Denis Denisenko adds: It might be interesting to note that the new 
variable (blue itself) has a common proper motion red companion 1.0' due 
South whose J-K color is compatible with M3V dwarf:
Variable blue object = USNO-B1.0 1038-0586809:
21 09 50.427 +13 48 39.95 pmRA=58+/-7 pmDE=-4+/-4 B1=17.72 R1=N/A
B2=18.14 R2=18.82 I=18.85

Brian Skiff reports: This seems to be a good result, and the erupting 
star is identifiable as USNO-B1.0 1038-0586809, which has significant 
proper motion (Nearby USNO-B1.0 1038-0586802 is the same star at an 
earlier epoch not linked in the catalogue).

A. Arai, Koyama Astronomical Observatory, Japan:
We performed optical low-dispersion spectroscopy (range 400-750nm; 
R~600@H-alpha) of a new variable star OT J210950.5+134840(*) on May 
25.67UT using 1.3m Araki-telescope with LOSA/F2 at Koyama Astronomical 
Observatory. Their spectrum shows blue continuum with a H_beta and 
H_gamma absorption with no significant blue-shifts. No obvious line is 
visible at H_alpha. This suggests that an emission component of H_alpha 
could be filling in the absorption line. Their result suggests that the 
object would be a dwarf nova in outburst.

SUPERNOVA 2011as IN UGC 3098 = PSN J04370666+4355353 (LOSS)
2011as  Jan 24.30   04 37 06.66  +43 55 35.3  19.1   6.5"E    0.5"N
J. M. Silverman et. al., University of California, Berkeley, report that 
inspection of a CCD spectrum of Mar. 9UT with the 10-m Keck I telescope 
(+ LRIS), shows it to be a type-II supernova with an age of about 1.5 
months, derived from the discovery and prediscovery images.

Guy M Hurst