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.

61 291 By Bikeman 1 week 3 days ago

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.


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).

HEN NEWS 04/2024 (The one with multi-messenger astrology in it)

American Association of Variable Star Observers (AAVSO)
Bikeman Fri, 05/10/2024 - 19:39

I’d like to look back on April and highlight some things that might be of interest for HEN members. So let’s start with April 1st, Fools Day. There were some hilarious papers posted on arxiv, here are just a few examples:

1) Multi-Messenger Astrology : https://arxiv.org/abs/2403.19749

Yeah, why be limited to observations in the visual spectrum for astrology if we have so many more wavelengths to observe today. Makes perfect nonsense :-)

Black Hole - Neutron Star merger alert (especially for Australia)

American Association of Variable Star Observers (AAVSO)
Bikeman Tue, 04/23/2024 - 07:41

This is especuially of interest for Australian observers right now as the night starts on the East coast soon: https://gracedb.ligo.org/superevents/S240422ed/view/


For a prioritized list of target galaxies to observe, go to http://ned.ipac.caltech.edu/NED::GWFevents/ and select "S240422ed" from the drop down list

HEN News 03/2024 (The one with alphabet soup in it [O4, LIGO, KAGRA, VIRGO,...])

American Association of Variable Star Observers (AAVSO)
Bikeman Thu, 04/04/2024 - 21:16

There are news from the gravitational wave observatories: The planned pause in the O4 observation run is almost over, and the O3b part of the run is scheduled to resume on April 10th, 0800 Pacific time. Low latency alerts are already active already now. So it's time again to be prepared for the vent everybody is waiting for: an alert about the next Binary Neutron Star (BNS) merger event with sky localization that would allow amateurs and professionals alike to hunt down any optical counterpart!

Details can be found at https://observing.docs.ligo.org/plan/

Request to observe source of X-Ray flare (southern hemisphere)

American Association of Variable Star Observers (AAVSO)
Bikeman Fri, 03/08/2024 - 08:22

The KiloNova Catcher (KNC) project has requested a Target Of Opportunity observation for the southern hemispehere (Gravitational Wave detectors are currently offline so this is not related to a "kilonova" trigger from LIGO/VIRGO (the main "business" of KNC), but could still be very interesting)

An interesting X-ray flare was observed by the newly launched Einstein Probe https://www.mpe.mpg.de/7867826/EinsteinProbe and floowed up by observations of by Neil Gehrels/SWIFT which conformed a source. Deep (say, 18 mag and fainter) observations in the optical are requested.

AAVSO 0313+41

American Association of Variable Star Observers (AAVSO)
Degen1103 Sat, 02/03/2024 - 04:54

The question is about AAVSO 0313+41, well known Perseus A, or NGC 1275, or QSO B0316+413, or... In spite of noted AAVSO number, the object is not presented in VSX, unlike of such QSOs as BL Lac, MRK 421 or QSO B0954+658.

What is the reason? Large diffuse galaxy light obstructs photometry of active nucleus? Low variability? Or something other?

HEN News 02/2024 (The one with Scary Barbie in it)

American Association of Variable Star Observers (AAVSO)
Bikeman Sun, 01/28/2024 - 20:41

Soon after the Zwicky Transient Facility (ZTF) had recorded the optical transient ZTF20abrbeie, it became clear that this one didn't quite match any of the more frequent types of an extra-galactic transient like a supernova, Gamma Ray Burst afterglow or a common type of AGN outburst. The light curve and spectroscopy hinted that this one was very energetic, and probably of some rarer type.