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"20 results found.
- IceCube Alert 241006.94: Global MASTER-Net observations report
- GRB 220117B: Swift/UVOT Upper Limits
- AX J1846.4-0258: Swift-BAT refined analysis
- GRB 200801C: BOOTES-1 and BOOTES-2 optical limits
- Swift Detection of an SGR-like flare from AX J1846.4-0258
- Trigger 884906: Swift detection of MAXI J1631-479
- Trigger 878548: Swift detection of AX 1631.9-4752
- Swift detects a flare from AX 1631.9-4752
- Trigger 848584: Swift detection of AX 1631.9-4752
- Trigger 689353: Swift detection of a transient near Sgr A*
- Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
- Swift trigger 649143 is not AX J1619.4-4945 or other astrophysical source
- Trigger 649143: Swift detection of AX J1619.4-4945
- GRB130408A: Swift/UVOT followup observations
- Trigger 502024: Swift detection of KS 1741-293
- Swift detection of AX J1749.1-2639
- Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
- GRB 071017 - Swift XRT observations
- GRB 071017: a SHORT GRB detected by INTEGRAL
- IBAS GRB Alert # 2463: not a GRB