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"23 results found.
- GRB 130505A: Largest E_iso ever measured
- GRB 090323: optical observations
- GRB 090323: Further TLS detections - a break?
- GRB090323: Optical observations from NOT
- GRB 090323: WSRT Radio Detection
- GRB 090323: Radio afterglow detection
- GRB 090323: Additional Lick observations
- GRB 090323: TLS detection at 5 days, no break
- GRB 090323: Faulkes Telescope South Observations
- GRB 090323: RTT150 optical observations
- GRB 090323: Lick observations
- GRB 090323: Fermi GBM Spectral Analysis
- GRB 090323: Optical observation of xinglong TNT
- GRB 090323 TLS detection - still bright
- GRB 090323: UVOT Detection of Afterglow
- GRB 090323: Swift-XRT refined analysis
- Konus-Wind observation of GRB 090323
- GRB 090323 Gemini-South Redshift
- GRB 090323: P60 Afterglow Confirmation
- GRB 090323: GROND Detection of the Afterglow and Photo-z
- GRB 090323: Possible XRT Counterpart
- IPN triangulation of GRB090323
- Fermi GBM and LAT detections of GRB 090323