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"3039 results found.
- GRB 020603, R-band observation
- GRB020531: optical observations
- GRB 020409: Optical Observations
- GRB020124 optical observations with RIBOTS/RIMOTS
- GRB 020321: Candidate X-ray Counterparts
- GRB011212: Optical Observations
- GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
- GRB011212: Optical observations at Gunma
- GRB011130 (=XRF011130): Further analysis of Chandra Target of
- IPN triangulation of GRB011121
- GRB 010629 Optical Observations
- GRB 010222
- IPN/RXTE TRIANGULATION OF GRB010126
- GRB010126, TNG R-band observations
- GRB010126 optical observations
- IPN TRIANGULATION OF GRB010126
- IPN triangulation of GRB001219
- IPN triangulation of GRB000911
- IPN localization of GRB000820
- IPN localization of GRB000811
- GRB000607, A SHORT, HARD BURST
- GRB000424, optical observations
- IPN localization of GRB991226
- GRB 991106, LOTIS Optical Observations
- IPN/NFI error box for GRB991014
- IPN error box for GRB990915 (=BATSE 7766)
- GRB990806 UBVRIJHK observations
- GRB990704, optical observations
- IPN error box for GRB990527
- IPN localization for GRB990506
- GRB 990316, Optical observations
- GRB990308, Possible new SGR~0209+70
- GRB990123, early optical counterpart detection
- GRB 981226 Optical Observations
- GRB 981226 optical observations
- GRB980326 IPN annulus
- Near-IR follow-up on GRB 971227
- Optical Observations of the GRB 971227 field
- GRB971227: Further CAHA R-band images