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 240615A: SAI CMO J- band observations
- GRB240615A: Gemini-North observations of the BAT and XRT positions
- GRB240615A: Gemini-North observations of the BAT and XRT positions
- IPN triangulation of GRB 240615A (short)
- GRB 240615A: NOT optical observations
- GRB 240615A: possible transient detection from Wendelstein observations
- GRB240615A: 1.3m DFOT optical upper limit
- GRB 240615A: J-band upper limits from WINTER
- GRB 240615A: Fermi GBM Observation
- GRB 240615A: Swift-XRT observations
- GRB 240615A: GECAM detection
- GRB 240615A: FLWO-1.2m optical upper limits
- Konus-Wind detection of GRB 240615A (short/hard)
- GRB 240615A: GOTO optical upper limits
- GRB 240615A: Swift ToO observations
- GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
- GRB 240615A: Fermi GBM Final Real-time Localization