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"15 results found.
- GRB 151022A: OSN optical upper limit
- GRB 151022A: Swift/UVOT Upper Limits
- GRB 151022A: Swift-BAT refined analysis
- GRB 151022A: RATIR Upper Limits
- GRB 151022A: Swift-XRT refined Analysis
- LIGO/Virgo G194575: Fermi GBM Observations
- GRB 151022A: MITSuME Okayama upper limits
- GRB 151022A: Enhanced Swift-XRT position
- LIGO/Virgo G194575: Identification of a GW CBC Candidate
- GRB 151022A: Mondy optical upper limit
- GRB 151022A: MITSuME Okayama Ks-band upper-limit
- GRB 151022A: Kanata/HOWPol optical observation
- GRB 151022A: Prompt enhanced Swift-XRT position
- GRB 151022A: MASTER-Ural observations
- GRB 151022A: Swift detection of a burst