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"7 results found.
- GRB240713A: Swift/UVOT Upper LImits
- GRB240713A: X-ray follow-up observation with EP-FXT (duplicate submission of GCN 36859)
- GRB240713A: X-ray follow-up observation with EP-FXT
- GRB240713A: Optical upper limit with Kinder observations
- Fermi Sub-threshold Observation of GRB240713A
- GRB240713A: TAROT and GRANDMA Observations of SVOM/ECLAIRs GRB240713A
- GRB240713A : The first probable GRB Located on-Board SVOM by ECLAIRs