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AAVSO International Database

Alert Notice 452: Simultaneous observations of SU Aur and AB Aur requested for XMM-Newton

8 February 2012:  Dr. Hans Moritz Guenther, Harvard-Smithsonian Center for Astrophysics, has requested bracketing and simultaneous observations in support of XMM-Newton x-ray observations of the classical T Tauri star SU Aur and the close-by Herbig Ae star AB Aur scheduled for February 15 - 17, 2012. The targets are too bright to use the XMM optical monitor for simultaneous monitoring, so your observing assistance is essential for correlation of the x-ray data.

Alert Notice 451: Monitoring of the Symbiotic Variable RT Cru Requested

January 27, 2012: The symbiotic variable RT Cru has brightened in hard x-rays. Dr. Jeno Sokoloski, Columbia University, has requested AAVSO assistance in monitoring RT Cru both now and in the future to see if it is doing anything unusual in the optical. The Swift/BAT hard X-ray light curve shows RT Cru has apparently been gradually brightening over the past few years.  

Filters

Approximate wavelengths for filters accepted for the AAVSO International Database

The filters listed below are used in the AAVSO International Database. For your reference, the approximate effective wavelength is given as well as the Full Width Half Maximum. These filters may be used when submitting observations to the AAVSO via WebObs.

Data Usage Reports are available again

We are happy to announce that after a few months of testing, the AAVSO's Data Usage Reports are now available to all observers again.  You may subscribe to these weekly reports by visiting this page:

http://www.aavso.org/apps/email/

Special Notice #263: SUPERNOVA 2011iy IN NGC 4984 = PSN J13085839-1531041

December 15, 2011:  IAU CBAT Central Bureau Electronic Telegram 2943 (Daniel W. E. Green, Ed.) announces the discovery of an apparent supernova in NGC 4984 by Koichi Itagaki, Yamagata, Japan, at unfiltered CCD magnitude 12.7 on 2011 Dec. 9.856 UT.

Coordinates: R.A. = 13 08 58.39  Decl. = -15 31 04.1 (2000.0)
SN 2011iy is 16.6" east and 6.1" south of the nucleus of NGC 4984.    

Special Notice #262: Long-term monitoring of AGN targets extended

November 2, 2011:  The observing campaign described in AAVSO Alert Notice 443 (M. Templeton) has been extended through the end of November 2011. One of the original targets, NGC 6814, has been removed from the target list for the remainder of the campaign.

AAVSO Special Notice #259: Possible bright transient in the region of M31

October 19, 2011: Ovcharov et al. announced the detection of a bright transient in the region of M31 in ATEL #3691 (2011 October 19).  They detected an object at R=10.95 on 2011 October 19.818. We are aware of no other confirming observations.

The object is at the following (J2000) coordinates:

RA: 00 44 55.27  Dec: +41 30 58.5

We note that this object is coincident with the blue source LGGS J004455.24+413059.7. Both visual and instrumental follow-up observations are strongly encouraged.

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