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"17 results found.
- GRB 181201A: photometric signature of the SN
- GRB 181201A: continued optical observations in Mondy
- GRB 181201A: ALMA detection of a fading mm afterglow
- GRB 181201A: Continued GROND observations show that afterglow is still bright
- GRB 181201A: AstroSat CZTI detection
- Konus-Wind observation of GRB 181201A
- GRB 181201A: Further COATLI Optical Monitoring
- GRB 181201A: VLT/FORS2 tentative spectroscopic redshift
- GRB 181201A: optical observations in Chilescope observatory
- GRB 181201A: Global MASTER-Net prompt optical descovery and afterglow observations
- GRB 181201A: COATLI Optical Detection
- GRB 181201A: Fermi-LAT detection
- GRB 181201A: Zeiss-1000/CrAO optical observations
- GRB 181201A: optical observations in SAAO
- GRB 181201A: Swift-XRT afterglow detection
- GRB 181201A: Swift ToO observations
- GRB 181201A: a long GRB detected by INTEGRAL