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THE ASTRONOMER Electronic Circular No 2820      2012 May 07 14.41UT
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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MASTER OPTICAL TRANSIENT J182201.93+324906.7
Further to the discovery note on TA E-Circular 2818, Denis Denisenko
reports via VSNET that he has checked the photographic plates of Moscow
collection covering the position of MASTER OT J182201.93+324906.7. In
total, 169 plates centred at Fl 104 Her were taken from 1976 Mar. 31 to
1994 Oct. 08. Typical exposures are 45 min, limiting magnitude B~17.

Two outbursts were detected which are separated by 13 months:
  YYYYMMDD(UT)   mag  observer
  19810821.832   156B (Crimean Astrograph of SAI MSU)
  19810822.795   156B
  19810829.730   162B
  19810830.755   164B
  19810904.680   165:

  YYYYMMDD(UT)   mag  observer
  19820823.817  <16   (Crimean Astrograph of SAI MSU)
  19820911.771   150B
  19820915.638   154B
  19820917.642   157B
  19820919.630   160B
  19820921.608   162B

SUPERNOVA 2012aw IN MESSIER 95 = PSN J10435372+1140177
The object mentioned in TA E-Circular 2807 was designated supernova
2012aw. The discovery was made by Paolo Fagotti, Italy at magnitude R =
15 on CCD images taken on 2012 Mar. 16.86UT using a 0.5-m reflector and
CCD.

Skvarc notes that nothing is visible at the position of the variable on
seven archive images taken during 2005 Apr. 25-2012 Feb. 15.

Ulisse Munari, Padova Astronomical Observatory, obtained an
under-exposed spectrum in a very short 5-minute break in the thick cloud
cover over Asiago Observatory on 2012 Mar. 17.77 UT with the 1.22-m
reflector (+ Boller & Chivens spectrograph).
The spectrum tracing corresponds to a very blue (hot) continuum,
essentially featureless, with no absorption bands and no detectable
emission lines, resembling a black-body energy distribution, similar to
what is seen in a cataclysmic variable close to maximum brightness.
Munari adds that Antonio Vagnozzi and Flavio Castellani (ANS
Collaboration) measured magnitudes B =
13.71 and V = 13.81 on Mar. 17.94, and B = 13.58 and V = 13.63 on Mar.
18.85.

SUPERNOVA 2012bb IN PGC 39723 (CHASE)
2012bb  Feb  2.19   12 19 51.97  -36 27 26.1  15.9  11.4"E,   8.0"N
N. Morrell: spectrum March 2 with the 6.5-m Magellan II Clay telescope
shows it to be a type-IIP supernova at about 2-3 weeks after maximum
light

SUPERNOVA 2012bc (CHASE)
2012bc  Feb  3.27   10 58 14.99  -46 34 31.5  17.8
N. Morrell: spectrum March 2 with the 6.5-m Magellan II Clay telescope +
CCD; normal type-Ia about 3 weeks past maximum.

Guy M Hurst