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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"18 results found.
- BepiColombo MGNS joins the IPN
- GRB 210112A: LBT host detection and correction to GCN 29319 (CAHA observations)
- GRB 210120A(MASTER OT J105242.66+152355.0 / AT2021axc): Mondy optical observations
- GRB 210112A: 3.6m DOT optical detection
- GRB 210112A: Insight-HXMT/HE detection
- GRB 210112A: Deep CAHA 2.2m detection
- Konus-Wind detection of GRB 210112A
- GRB 210112A: Swift/UVOT Detection
- GRB 210112A: Mondy optical observations
- GRB 210112A: 1.3m DFOT Optical upper limit
- GRB 210112A: OSN second epoch, decay
- GRB 210112A: Swift-BAT refined analysis
- GRB 210112A: OSN Reddened Afterglow Detection
- GRB 210112A: Swift-XRT refined Analysis
- GRB 210112A: AGILE detection
- GRB 210112A: Kitab a optical upper limit
- GRB 210112A: Enhanced Swift-XRT position
- GRB 210112A: Swift detection of a burst with an optical counterpart