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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"16 results found.
- GRB 201029A: Swift-XRT refined Analysis
- GRB 130925A: continuing Swift/XRT monitoring
- Konus-Wind observation of GRB 130925A
- GRB 121027A: sub-mm upper limit
- GRB 121027A: Swift/UVOT Possible Detection
- GRB 121027A: X-shooter redshift confirmation
- GRB 121027A - Gemini South spectroscopy
- GRB 121027A: GROND Confirmation of Rebrightening
- GRB 121027A: MASTER early prompt optical limit
- GRB 121027A: Swift-XRT refined Analysis
- GRB 121027A: Brightening IR counterpart
- GRB 121027A: Enhanced Swift-XRT position
- GRB 121027A: nIR afterglow candidate with AAT
- GRB 121027A: Swift-BAT refined analysis
- GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
- GRB 121027A: Swift detection of a burst