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"26 results found.
- GRB 210610A: Spectroscopy and redshift confirmation with the Himalayan Chandra Telescope
- IceCube-210210A: Two Additional Optical Candidate Counterparts Found by DECam
- GRB 210210A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
- GRB 210210A: CAHA 2nd epoch and jet break confirmation
- IceCube-210210A: Four Candidate Optical Counterparts from DECam Observations
- IceCube-210210A: Upper limits from a search for additional neutrino events in IceCube
- GRB 210210A : 1.3m DFOT optical observations
- GRB 210210A as a BdHN II
- Swift-XRT observations of IceCube-210210A
- GRB 210210A: CAHA detection and likely jet break
- IceCube-210210A: No neutrino counterpart in ANTARES
- Fermi-LAT Gamma-ray Observations of IceCube-210210A
- GRB 210210A: FRAM-ORM afterglow detection
- GRB 210210A: Swift-BAT refined analysis
- IceCube-210210A: Upper limits from Fermi-GBM Observations
- IceCube-210210A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- IceCube-210210A: Two Candidate Counterparts from the Zwicky Transient Facility
- GRB 210210A: LCO Optical Afterglow Detection
- GRB 210210A: Swift/UVOT Detection
- IceCube-210210A: IceCube observation of a high-energy neutrino candidate event
- GRB 210210A: Swift-XRT refined Analysis
- GRB 210210A: Redshift from OSIRIS/GTC
- GRB 210210A: Enhanced Swift-XRT position
- GRB 210210A: MASTER afterglow observation
- Swift GRB 210210A: Global MASTER-Net observations report
- GRB 210210A: Swift detection of a burst with an optical counterpart