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"18 results found.
- GRB 200522A: HST NIR counterpart confirmation
- GRB 200522A: Candidate Optical/nIR Counterpart from Gemini and HST Imaging
- GRB 200522A: Gemini North spectroscopy of the putative host galaxy
- GRB 200522A: Further HST F125W Observations
- GRB 200522A: HST F125W new point source detection
- GRB 200522A: Hubble Space Telescope Near-IR F160W Observations
- GRB 200522A: Gemini North optical imaging
- GRB 200522A: Correction to GCN 27792
- GRB 200522A: Swift-BAT refined analysis
- GRB 200522A: LCO Optical Afterglow Detection
- Swift GRB 200522A: Global MASTER-Net observations report
- GRB 200522A: 6 GHz VLA radio source detection
- GRB 200522A: Swift-XRT refined Analysis
- GRB 200522A: BOOTES-3/YA optical upper limit
- GRB 200522A: Swift/UVOT Upper Limits
- GRB 200522A: Enhanced Swift-XRT position
- GRB 200522A: Coincident catalogued galaxy at z~0.4
- GRB 200522A: Swift detection of a short burst