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"20 results found.
- GRB 150818A: TSHAO and SAO RAS optical observations
- GRB 150818A: Spectroscopic confirmation of the SN from GTC
- GRB 150818A: possible SN rise in light curve of Mondy observations
- Konus-Wind observation of GRB 150818A
- GRB 150818A: continued Mondy optical observations
- GRB 150818A: Mondy optical observations
- GRB 150818A: Continued NOT monitoring - afterglow confirmation
- GRB 150818A: 10.4m GTC spectroscopy and host galaxy
- GRB 150818A: Mondy optical observations
- GRB 150818A: MITSuME Ishigakijima upper limits
- GRB 150818A: MITSuME Akeno optical upper limits
- GRB 150818A: Swift-XRT update, correction to GCN 18162
- GRB150818A: NOT imaging
- GRB 150818A: Swift-XRT refined Analysis
- GRB 150818A: Swift/UVOT Detection
- GRB 150818A: Enhanced Swift-XRT position
- GRB 150818A: Swift-BAT refined analysis
- GRB 150818A: Swift/UVOT candidate afterglow
- GRB 150818A: Planned XMM-Newton observation
- GRB 150818A: Swift detection of a burst