Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').

20 results found.

  1. LIGO/Virgo S190930s: no counterpart candidate in the SVOM/GWAC observations
  2. LIGO/Virgo S190930s: Updated Sky Localization
  3. LIGO/Virgo S190930s: Upper limits from Insight-HXMT/HE observations
  4. LIGO/Virgo S190930s: no counterpart candidates in SAGUARO/CSS observations
  5. LIGO/Virgo S190930s: No counterpart candidates in KAIT observations
  6. LIGO/Virgo S190930t and S190930s: MASTER OT J205529.78+220725.5/AT2019rpr further analysis
  7. LIGO/Virgo S190930t and S190930s: MASTER PSN in unknown disk galaxy
  8. LIGO/Virgo S190930t and S190930s: MASTER optical observation and optical transient
  9. LIGO/Virgo S190930s: No counterpart candidates in Fermi-LAT observations
  10. LIGO/Virgo S190930s: Upper limits from CALET observations.
  11. LIGO/Virgo S190930s: no counterpart candidates in the Swift/BAT observations
  12. LIGO/Virgo S190930s: Upper limits from Fermi-GBM Observations
  13. LIGO/Virgo S190930s: no counterpart candidates in AGILE-GRID observations
  14. LIGO/Virgo S190930s : no neutrino counterpart candidate in ANTARES search
  15. LIGO/Virgo S190930s: No counterpart candidates in AGILE-MCAL observations
  16. LIGO/Virgo S190930s: Coverage and upper limits from MAXI/GSC observations
  17. LIGO/Virgo S190930s: Upper limits from IceCube neutrino searches
  18. LIGO/Virgo S190930s: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  19. LIGO/Virgo S190930s: Identification of a GW compact binary merger candidate
  20. LIGO/Virgo S190930s: Global MASTER-Net observations report

Advanced

Download all Circulars as a .tar.gz archive:
Looking for U.S. government information and services? Visit USA.gov