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"19936 results found.
- IPN detection of further activity from SGR1806-20
- Optical observation of SGR 1806-20 at the 6-m SAO telescope
- Probable SGR or Short Duration GRB Detected by HETE
- Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
- Possible burst from SGR1806-20
- IPN detection of SGR1900+14
- X-ray precursors to the large flare from SGR 1900+14
- SGR 1900+14: No evidence of extended X-ray emission
- SGR 1900+14 : RXTE observations
- BeppoSAX/NFI Follow-up Observation of SGR 1900+14
- SGR1900+14
- SGR 1900+14: Correction to GCN 1049
- Millimeter observation of SGR 1900+14
- SGR 1900+14: Detection of extended X-ray emission
- Chandra Observations of SGR 1900+14
- SGR 1900+14, Chandra observations
- Chandra Observations of SGR 1900+14
- SGR1900+14, I-band observations
- SGR 1806-20 burst activity
- BATSE GRB trigger criteria
- X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
- GRB990308 not a new SGR
- GRB990308, Possible new SGR~0209+70
- SGR1900+14, BeppoSAX-GRBM observations
- SGR1627-41
- SGR1627-41, RXTE/ASM observations
- Reduced error box of SGR 1627-41
- SGR 1627-41
- Discovery of a new SGR source, SGR1627-41
- SGR 1900+14
- SGR1900+14
- SGR1900+14
- BATSE on-board GRB trigger change
- IRAS 18119-1342 and the possible new SGR
- Possible new SGR from US Naval Observatory
- RXTE Observations of SGR 1814-13