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 200227A: RATIR Optical Observations
- IceCube-200227A: Upper limits from a search for additional neutrino events in IceCube
- GRB 200227A: Mondy optical upper limit
- Fermi-LAT Gamma-ray Observations of IceCube-200227A
- GRB 200227A: Insight-HXMT/HE detection
- IceCube-200227A : Upper limits from Insight-HXMT/HE observations
- GRB 200227A: Swift-XRT refined Analysis
- GRB 200227A: Swift-BAT refined analysis
- GRB 200227A: Swift/UVOT Upper Limits
- GRB 200227A: Enhanced Swift-XRT position
- IceCube-200227A: Upper limits from Fermi-GBM Observations
- GRB 200227A: Fermi GBM observation
- IceCube-200227A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- GRB 200227A: MITSuME Akeno optical upper limit
- IceCube-200227A: IceCube observation of a high-energy neutrino candidate event
- GRB 200227A: Swift detection of a burst
- GRB 200227A: Fermi GBM Final Real-time Localization