High Energy Network (HEN)

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Information on the observation and analysis of stars and other objects that are sources of x-rays and gamma rays.

7 73 By Bikeman 5 days 12 hours ago

Welcome to the High Energy Network

American Association of Variable Star Observers (AAVSO)
daveh Tue, 02/25/2020 - 17:48

Welcome to the AAVSO International High Energy Network Forum and the High Energy Network Observing Section. The AAVSO International High Energy Network is dedicated to the optical monitoring of high energy astrophysical phenomena in the universe. It is an expansion of the AAVSO International Gamma-Ray Burst Network which had great success in discovering and observing the optical afterglows of gamma-ray bursts (GRBs).

Kilonova Catcher Project by GRANDMA

American Association of Variable Star Observers (AAVSO)
Bikeman Sat, 02/13/2021 - 22:59

I'd like to promote the Kilonova-Catcher citizen science project here. This seems to be perfect for collaboration with High Energy Network observers of the AAVSO.


If you haven't watched it already, the second part of this AAVSO webinar

https://youtu.be/WIDxZDA2ZvY "AAVSO Webinar, with Melanie Crowson and Dr. Sarah Antier"

is a perfect introduction into this subject. The second part where Dr Sarah Antier explains this starts at around 39min  into the webinar.


BL Lac still exciting, other notable ATLEs

American Association of Variable Star Observers (AAVSO)
Bikeman Mon, 01/25/2021 - 16:03

A series of recent ATELs indicates that the pros are very excited about BL Lac lately:

http://www.astronomerstelegram.org/?read=14328 "The flaring blazar BL Lacertae observed below R=11.5, a new record for its optical brightness"

http://www.astronomerstelegram.org/?read=14329 "Erratum to ATel #14328"

http://www.astronomerstelegram.org/?read=14330 "Fermi-LAT gamma-ray flare in BL Lacertae contemporaneous with optical flaring activity"

http://www.astronomerstelegram.org/?read=14334 "Multicolor-optical observation of the flaring blazar BL Lacertae"

Free Zoom Colloquium on X-ray Binaries

American Association of Variable Star Observers (AAVSO)
gsivakoff Tue, 09/22/2020 - 15:36


Hi All,

Given the clear connection between CVs and X-ray binaries, I wanted to make this announcement.

Interested in some of my team's recent results? Join my Zoom presentation of a Colloquium for the University of Alberta Physics Department this Friday. Please note that this talk was designed with undergraduate Physics students in mind!!

Title: Winds of Change around Black Holes

Presenter: Gregory Sivakoff (University of Alberta)

Time: Friday, September 25 3:00 PM Mountain Time (US and Canada)

Observations of Blazar S5 1803+78 critically needed

American Association of Variable Star Observers (AAVSO)
daveh Tue, 04/14/2020 - 19:33

Blazar S5 1803+78 is rapidly brightnening. Observers in Spain and Germany have contributed recent observations, but the weather in Europe has been overcast and probably will be until at least this weekend. Observations outside of these areas are encouraged until the weather clears. The next several days may be critical as the blazar seems to be reaching a peak magnitude. Please make observations if possible and upload to light curve for S5 1803+78.


Dave (HDHA)