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"18 results found.
- GRB 241228B: Fermi-LAT detection
- GRB 241228B: 1.3m DFOT Optical observations
- GRB 241228B: Multiband optical monitoring with 1.6m Mephisto
- GRB 241228B: SAO RAS optical observations
- GRB 241228B: D50 optical detection
- GRB 241228B: Fermi GBM Observation
- GRB 241228B: Swift-XRT afterglow detection
- GRB 241228A: Mondy optical afterglow observations
- GRB 241228B: VLT/X-shooter redshift of z = 2.674
- GRB 241228B: LCO optical observation
- GRB 241228B: Swift/BAT-GUANO localization skymap of a burst
- Fermi GRB 241228B: Global MASTER-Net observations report
- GRB 241228B: LCOGT photometry of the likely optical counterpart GOTO24jmz
- GRB 241228B: GOTO24jmz optical follow-up observations
- GRB 241228B: Swift ToO observations
- GRB 241228B: TRT optical counterpart confirmation
- GRB 241228B: GOTO possible optical counterpart candidate
- GRB 241228B: Fermi GBM Final Real-time Localization