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"1526 results found.
- Search for counterpart to IceCube-160814A with ANTARES
- INTEGRAL/SPI-ACS observation of IceCube HESE 128340 58537957
- Fermi GBM Observations of IceCube-160806A
- IceCube 160806A: Lomonosov BDRG gamma ray prompt observations
- INTEGRAL/SPI-ACS and IBIS_VETO search for prompt gamma-ray counterpart of IceCube-160806A
- IceCube 160806A EHE Neutrino Candidate Event
- IceCube-160731A: Konus-Wind limits
- Search for counterpart to IceCube-160731A with ANTARES
- IceCube-160731A: iPTF P48 Observations
- GBM Observations of IceCube 160731
- FACT follow-up of IceCube20160731
- Global MASTER net follow up of IceCube-160731A
- Swift follow up of IceCube-160731A
- HAWC follow up of IceCube 160731
- FACT follow-up of the IceCube event 160427A
- Interplanetary Network Search for IceCube 160427A
- IceCube-160427A: iPTF Observations
- ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
- VERITAS rapid follow-up observations of IceCube event 160427A
- IceCube-160427A: Fermi GBM Observations
- ICECUBE-160427A neutrino candidate event: updated direction information
- MASTER search for counterpart to the IceCube event 67093193 (run 127853)
- Archival observations by HAWC of IceCube HESE event of April 27, 2016
- Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)
- GRB 130427A: High-energy neutrino search
- GRB 080319B: IceCube upper limit on high-energy neutrino flux