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"3038 results found.
- GRB 020317 : KISO Optical Observations
- GRB 020305: Candidate optical afterglow
- GRB020305, optical observations
- GRB020305 (=H1939): Localization of a GRB by HETE
- IPN Upper Limits to a GRB Associated With SN2002ap
- GRB011130 (=XRF011130): Further analysis of Chandra Target of
- GRB 011130: Optical Observations of Chandra Sources
- GRB011130 (XRF011130) Chandra Observations
- GRB011019: A Faint, X-ray Rich GRB localized by HETE
- Optical Observations of the field of HETE trigger #1793/GRB 011012?
- SGR1806-20: Localization by HETE
- GRB010222: possible optical counterpart
- IPN triangulation of GRB 001004
- GRB000926 K'-band Observation
- GRB000926: X-ray afterglow by BeppoSAX & plan of BSAX & Chandra obs.
- IPN localization of GRB000801
- IPN localization of GRB000730
- GRB000623
- GRB000615, R-band photometry
- BeppoSAX X-ray transient/possible GRB000608
- GRB 000408, optical observations
- IPN annulus for GRB000115
- Single IPN error box for GRB991229
- IPN error boxes for GRB991229
- Single IPN error box for GRB991221
- IPN error boxes for GRB991221
- GRB 991216 RXTE ASM Observations
- IPN localization of GRB990704
- GRB990510: X-ray afterglow
- GRB990510 optical observations
- GRB 990506, optical observations
- GRB 990506, optical observations
- GRB 981220 Optical observations
- GRB981226, sub-millimeter observations
- Optical Observations of GRB981226
- GRB 981220:Optical Observations
- GRB 981226 - Infrared Observations
- GRB 971214: USNOFS Observations Summary