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"14 results found.
- GRB 241228A: VIRT Optical Upper Limit
- GRB 241228A: 1.3m DFOT upper limit
- IceCube-Cascade 241228A: Upper limits from a search for additional neutrino events in IceCube
- Konus-Wind detection of GRB 241228A
- GRB 241228A: Mondy optical afterglow observations
- GRB 241228A: NOT optical upper limits
- GRB 241228A: Swift-BAT refined analysis
- GRB 241228A: Fermi GBM Observation
- Swift GRB 241228A: Global MASTER-Net observations report
- GRB 241228A: GROWTH-India telescope optical upper limit
- GRB 241228A: Swift-XRT refined Analysis
- GRB 241228A: Swift/UVOT Upper Limits
- GRB 241228A: Enhanced Swift-XRT position
- GRB 241228A: Swift detection of a burst