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"16 results found.
- GRB 200410A: Liverpool Telescope First Hour Observations
- GRB 200410A: Optical upper limit
- GRB 200410A: CALET Gamma-Ray Burst Monitor detection
- GRB 200410A: Swift-BAT refined analysis
- IceCube-200410A: No significant detection in HAWC
- IceCube-200410A : Upper limits from Insight-HXMT/HE observations
- IceCube-200410A: Upper limits from a search for additional neutrino events in IceCube
- Fermi-LAT Gamma-ray Observations of IceCube-200410A
- IceCube-200410A: Upper limits from Fermi-GBM Observations
- IceCube-200410A: Possible associated excess in INTEGRAL SPI-ACS prompt observation
- IceCube-200410A - IceCube observation of a high-energy neutrino candidate event
- GRB 200410A: Swift/UVOT Detection
- GRB 200410A: Swift-XRT refined Analysis
- GRB 200410A: Enhanced Swift-XRT position
- GRB 200410A: Ondrejov D50 afterglow confirmation
- GRB 200410A: Swift detection of a burst with a possible optical counterpart