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AAVSO International Database

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

Campaign to monitor the recurrent nova T Pyx throughout 2011 eruption

April 15, 2011: Dr Bradley Schaefer (Louisiana State University) has initiated an international campaign to observe the recurrent nova T Pyx during its current eruption (see AAVSO Alert Notices 436 and 437). He asks the assistance of the AAVSO and our observers, and writes:

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.

Special Notice #238: HST observations scheduled for GW Lib

April 2, 2011: Further to AAVSO Alert Notice 433, Dr. Paula Szkody, University of Washington, informs us that the time of the HST observations of GW Lib has been set for Friday night, 2011 April 8/9. The ground observations to confirm that the object is not in outburst - and allow the HST observations to take place - will thus need to take place on Thursday, April 7/8.

Special Notice #237: Nova Sagittarii 2011 No. 2 = PNV J18102135-2305306 [V5588 Sgr]

March 28, 2011: We have been informed by the Central Bureau for Astronomical Telegrams (Central Bureau Electronic Telegram 2679, Daniel W. E. Green, ed.) that Koichi Nishiyama, Kurume, Japan, and Fujio Kabashima, Miyaki, Japan, report their discovery of a possible nova [V5588 Sgr] at magnitude 11.7 on two unfiltered CCD frames taken around March 27.832 UT. They confirmed the object on images taken on March 27.832 UT.

Alert Notice 433: Request for observations of GW Lib in support of HST observations

March 20, 2011: Dr. Paula Szkody, University of Washington, has requested our help in monitoring the cataclysmic variable GW Lib for upcoming Hubble Space Telescope observations, scheduled to be made during the week of 2011 April 7-11 UT. Dr. Szkody also observed this object with HST in March 2010 (see AAVSO Alert Notice 417).

Alert Notice 432: Supernova 2011at = PSN J09285756-1448206 in MCG -02-24-27

March 14, 2011

Discovered by: Lou Cox, Jack Newton, and Tim Puckett, Ellijay, GA, in the course of the Puckett Observatory Supernova Search

Discovery Date: March 10.214 UT

Discovery Magnitude: unfiltered CCD magnitude 14.5 (limiting magnitude 19.0) taken with a 0.40-m reflector at Portal, AZ

Position: R.A. = 09:28:57.56  Decl. = -14:48:20.6 (equinox 2000.0)
SN 2011at is 20.4" east and 6.3" north of the center of PGC 26905 = MCG -02-24-27.

Alert Notice 431: Request to monitor SDSS074545 for HST Observations

February 25, 2011: Dr. Paula Szkody (University of Washington) has requested our help in monitoring the cataclysmic variable SDSS074545 (SDSS J074531.91+453829.5) for upcoming Hubble Space Telescope observations. The HST observations are scheduled to be made during the week of 2011 March 7-14. Dr. Szkody also observed this object with HST in October-November 2007 (see AAVSO Alert Notice 359).

Special Notice #233: Bright outburst of the cataclysmic variable SDSS J133941.11+484727.5

February 7, 2011: The star SDSS J133941.11+484727.5 has been reported in outburst by Jeremy Shears (Bunbury, UK).  Shears reports this star at magnitude 10.4 on 2011 February 7.919 (JD 2455600.419).  This is approximately 7 magnitudes above quiescence, which suggests a superoutburst of an SU UMa star or a WZ Sge-like outburst.  Gary Poyner (Birmingham, UK) confirms this outburst, estimating the star at 10.5 on February 7.959 (2455600.459).

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