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"28 results found.
- GRB 251002A - SVOM/ECLAIRs refined analysis
- GRB 251002A: LAST optical observations
- GRB 251002A: Mondy/AZT-33IK optical observations
- GRB 251002A: Insight-HXMT detection
- GRB 251002A: Insight-HXMT detection
- GRB 251002A: NIR observations with WINTER
- GRB 251002A: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
- GRB 251002A: Swift/UVOT detection
- GRB 251002A: Fermi GBM Observation
- GRB 251002A: GOTO detection of optical counterpart
- GRB 251002A: AKO Early Optical Afterglow Detection
- GRB 251002A: Swift-XRT afterglow detection
- GRB 251002A: Kilonova-Catcher optical afterglow detection
- GRB 251002A: AbAO optical observations
- GRB 251002A: SVOM/COLIBRÍ (FM-GFT) optical observations
- GRB 251002A: J band observations by SYSU 80cm infrared telescope
- GRB 251002A: OHP/T193 MISTRAL optical afterglow detection
- GRB 251002A: VLT/X-shooter spectroscopic redshift z = 2.178
- GRB 251002A: EP-FXT counterpart detection
- Fermi/SVOM GRB 251002A : MASTER OT earlier detection in 2 polarization filters
- GRB 251002A: BOOTES-6 early optical detection
- GRB 251002A: SAO RAS optical observations
- GRB 251002A: ULL-ASTRO-MASTER early detection of the optical afterglow with the LCO 40-cm telescope at Sutherland Observatory
- GRB 251002A: FRAM-ORM afterglow detection
- GRB 251002A: LCO optical observation
- GRB 251002A: SVOM/VT optical observation
- GRB 251002A: SVOM detection of a burst
- Fermi GRB 251002A: Global MASTER-Net observations report