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ATCA discovery of two Extreme Scattering Events in progress

ATel #8696; Keith Bannister (CASS), Hayley Bignall, Simon Johnston (CASS), Cormac Reynolds (CASS), Jamie Stevens (CASS), Artem Tuntsov (Manly Astrophysics), Mark Walker (Manly Astrophysics).
on 15 Feb 2016; 02:52 UT
Credential Certification: Keith Bannister (keith.bannister@csiro.au)

Subjects: Radio, AGN, Variables

Referred to by ATel #: 9092

We report the discovery of two extreme scattering events (ESE; 1, 2) in progress:

PMN J1740-0811 (RA=17:40:01.6 dec=-08:11:14.8 J2000) appears to be a long duration ESE which started about MJD 57300. It appears to be currently demagnified.

87GB 192724.2+090329 (RA=19:29:47.9 dec=+09:10:03.6 J2000) is a rapid ESE that probably began around MJD 57360. It appears to be currently during its second magnification.

Radio light curves and spectra are available here [3]

We are currently monitoring both ESEs with the ATCA and VLBA. We encourage multiwavelength monitoring.

[1] http://adsabs.harvard.edu/abs/1987Natur.326..675F
[2] http://adsabs.harvard.edu/abs/2016Sci...351..354B
[3] http://www.atnf.csiro.au/content/keith-bannister/atese/atel1

ESE light curves and spectra