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').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"11 results found.
- LIGO/Virgo S200311bg: Upper limits from Konus-Wind observations
- LIGO/Virgo S200311bg: Updated Sky Localization and EM Bright Classification
- LIGO/Virgo S200311bg: Not observable by CALET
- LIGO/Virgo S200311bg: Swift/BAT in the South Atlantic Anomaly
- LIGO/Virgo S200311bg: No significant counterpart candidates in Fermi-LAT observations
- LIGO/Virgo S200311bg: not observable by Fermi GBM
- LIGO/Virgo S200311bg: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200311bg: not observable by AGILE at the event time
- LIGO/Virgo S200311bg: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
- LIGO/Virgo S200311bg: Upper limits from IceCube neutrino searches
- LIGO/Virgo S200311bg: Identification of a GW compact binary merger candidate