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"19 results found.
- GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
- GRB 211106A: Third HST Observation
- GRB 211106A: XMM-Newton monitoring campaign detections
- GRB 211106A: Second HST Observation
- GRB 211106A: GECAM detection
- GRB 211106A: HST Observations
- GRB 211106A: Chandra Observations
- GRB 211106A: Swift/UVOT upper limits
- IPN triangulation of GRB 211106A (short)
- Short GRB 211106A: spectroscopy of galaxies in the field
- GRB 211106A: VLT/FORS2 optical observations
- GRB 211106A, GROND observations
- GRB 211106A: Swift-XRT afterglow detection
- MeerLICHT follow-up of GRB 211106A
- Fermi GBM Sub-Threshold Detection of GRB 211106A
- Konus-Wind detection of GRB 211106A
- GRB 211106A: Swift-XRT observations
- GRB 211106A: Swift ToO observations
- GRB 211106A: Swift/BAT-GUANO candidate arcminute localization of a short burst