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.
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"
22 results found.
- Konus-Wind detection of GRB 210610B
- uGMRT radio detection of GRB 210204A
- GRB 210204A (ZTF21aagwbjr/AT2021buv): continued Assy and Mondy optical observations
- GRB 210204A (ZTF21aagwbjr/AT2021buv): continued CrAO and AbAO optical observations
- GRB 210204A: observations with the 3.6m Devasthal Optical Telescope and possible jet break
- GRB 210204A (ZTF21aagwbjr/AT2021buv): continued Mondy optical observations
- GRB 210204A: LBT observations and jet break
- GRB 210204A: redshift revision of ZTF21aagwbjr/AT2021buv (correction to GCN 29411)
- Konus-Wind detection of GRB 210204A (correction to GCN 29415)
- GRB 210204A (ZTF21aagwbjr/AT2021buv): Mondy and AbAO optical observations
- Konus-Wind detection of GRB 210204A / ZTF21aagwbjr
- GRB 210204A: Optical Observations from HCT
- GRB 210204A / ZTF21aagwbjr: Swift-XRT observations
- GRB 210204A: Swift ToO observations
- VLT/X-shooter redshift of 1.466 for ZTF21aagwbjr/AT2021buv, strengthening its association with GRB 210204A
- GRB 210204A: AstroSat CZTI Detection
- IPN triangulation of GRB 210204A
- Fermi GRB 210204A: Global MASTER-Net observations report
- GRB 210204: Fermi GBM observation
- GRB 210204A: GECAM detection
- GRB 210204A: BALROG localization (Fermi Trigger 634112970 / GRB 210204270)
- GRB 210204A: Fermi GBM Final Real-time Localization