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Alert Notice 439: Correction to AAVSO Alert Notice 438 on SN 2011by

April 28, 2011:  In AAVSO Alert Notice 438 on Supernova 2011by in NGC 3972 (issued 2011 April 28), the position was attributed to the wrong object. Here is the corrected text:

Position: R.A. = 11:55:45.56  Decl. = +55:19:33.8 (equinox 2000.0)
SN 2011by is about 5.3" east and 19.1" north of the center of NGC 3972.

Sincere apologies for the error.

This Alert Notice was issued by Elizabeth O. Waagen.

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SUBMIT OBSERVATIONS TO THE AAVSO

AAVSO Alert Notice 438

SUPERNOVA 2011by in NGC 3972 = PSN J11554556+5519338

April 28, 2011

Discovered by:  Zhangwei Jin, Ningbo, Zhejiang, China, and Xing Gao, Urumqi, Xinjiang, China

Discovery Date:  Apr. 26.8234 UT

Discovery Magnitude:  approximately 14.2 using a Celestron C14 Schmidt-Cassegrain telescope (+ unfiltered CCD camera) at Mt. Nanshan

Visual Observing Manual updates

The Manual for Visual Observing of Variable Stars has been updated to reflect changes to the VSP and WebObs that happened when the new website was launched last summer. This mostly affects Chapters 2 and 7. To download these and other chapters, or the entire Manual, please click on the link below:

http://www.aavso.org/visual-observing-manual

You will also find versions of the Manual translated into seven other languages on this page.

AAVSO Alert Notice 437

Campaign to monitor the recurrent nova T Pyx throughout 2011 eruption

April 15, 2011:  Further to AAVSO Alert Notice 436, a fast photometry observing campaign has been initiated by Dr. Bradley Schaefer (Louisiana State University) to monitor the recurrent nova T Pyxidis throughout its current eruption.

Alerta de AAVSO 436

Erupción de la nova recurrente T Pyxidis
14 de abril de 2011

La nova recurrente T Pyxidis ha sido descubierta en erupción. Fue detectada por M. Linnolt (Hawaii, Estados Unidos) con magnitud visual 13.0 en abril 14.2931, 2011 (JD 2455665.7931), y confirmada por A. Plummer (m(vis)=12.2, JD 2455665.8847) y S. Kerr (m(vis)=11.3, JD 2455665.9410).  Esta es la primer erupción de T Pyx desde el 7 de diciembre de 1966, hace casi 45 años. Se solicitan urgentemente observaciones de esta rara variable eruptiva, comenzando inmediatamente.

AAVSO Alert Notice 436

New ejaavso preprint: "Times of Minima and New Ephemerides..." by A. Marchini et al.

ej 141: "Times of Minima for Several Eclipsing Binaries and New Ephemerides for V569 Lyrae, V571 Lyrae, and V572 Lyrae" (A. Marchini et al.)

http://www.aavso.org/ejaavso141

Alert Notice 435: V5588 Sgr = Nova Sagittarii 2011 No. 2 = PNV J18102135-2305306 [V5588 Sgr]

Apri1 3, 2011

Event: V5588 SGR = NOVA SAGITTARII 2011 No. 2 = PNV J18102135-2305306  [V5588 Sgr]

Discovered by: Koichi Nishiyama, Kurume, Japan, and Fujio Kabashima, Miyaki, Japan

Discovery Date: ~ 2011 March 27.832 UT

Discovery Magnitude: unfiltered CCD magnitude mag 11.7 on two 40-s unfiltered CCD frames using a 105-mm f/4 camera lens (+ SBIG STL6303E camera)

Position: R.A. = 18:10:21.35, Decl. = -23:05:30.6 (equinox 2000.0)

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