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.
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"
24763 results found.
- GRB 161105A: Swift-BAT refined analysis
- GRB 161105A: Enhanced Swift-XRT position
- Search for counterpart to IceCube-161103A with ANTARES
- GRB 161104A: GROND observations
- GRB 161105A: Swift detection of a burst
- GRB 161104A: Swift/UVOT Upper Limits
- GRB 161104A, Swift-BAT refined analysis
- GRB 161104A: Swift-XRT refined Analysis
- Fermi GBM Observations of IceCube-161103
- IceCube-161103: Swift-XRT observations
- GRB 161104A: Enhanced Swift-XRT position
- GRB 161104A: Swift detection of a short burst
- INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
- HAWC follow up of IceCube-161103
- GRB 161020A: Fermi GBM observation
- GRB 161023A: GROND Observations
- GRB 161023A: Swift-XRT afterglow detection
- GRB 161023A: TAROT La Silla observatory optical observations
- GRB 161023A: Zadko observatory - Gingin optical observations
- GRB 161023A: Watcher optical observations
- GRB 161023A: LCOGT-FTS optical observations
- GRB 161023A: A long GRB detected by INTEGRAL
- Swift Trigger 718919 is not an astrophysical event.
- GRB 161022A: Swift-BAT refined analysis
- GRB 161022A: RATIR Optical and NIR Observations
- GRB 161022A: Swift/UVOT Upper Limits
- GRB 161022A: Fermi GBM observation
- GRB 161022A: NOT optical observations
- GRB 161022A: Enhanced Swift-XRT position
- GRB 161022A: Swift-XRT refined Analysis
- IPN Triangulation of GRB 161020B
- GRB 161022A: TAROT Calern observatory optical observations
- GRB 161022A: Swift detection of a burst
- GRB 161020A: A long GRB detected by INTEGRAL
- GRB 161015A: further Swift-XRT follow-up observations
- Konus-Wind observation of GRB 161017A
- GRB161017A optical R band observations with SARA-RM
- GRB 161017A: Swift-BAT refined analysis
- GRB 161017A: Swift/UVOT Detection
- GRB 161017A: Swift-XRT refined Analysis
- GRB161017A: optical observations with 1-m LCOGT McDonald
- GRB 161017A: TNG optical observations
- GRB 161017A: Fermi GBM observation
- GRB 161017A: Enhanced Swift-XRT position
- GRB 161014A: Continued RATIR Optical and NIR Observations
- GRB 161015A: Swift/UVOT observations
- GRB 161017A: Swift detection of a burst with a bright optical afterglow
- GRB161017.74 MASTER-Net OT detection
- GRB161015A: AstroSat CZTI detection
- GRB 161014A: refined analysis of TSHAO optical observations
- GRB 161015A: Fermi GBM detection
- GRB161004A: Further analysis of the burst nature
- GRB 161014A: RATIR Optical and NIR Observations
- GRB 161014A: Fermi GBM observation
- GRB 161014A: Swift-XRT refined Analysis
- GRB 161014A: Swift-BAT refined analysis
- GRB 161014A: TNG optical observations
- GRB 161014A: AROMA-N Optical Observation
- GRB 161014A: Swift/UVOT Detection
- GRB161014A: NOT optical observations
- GRB 161014A: TSHAO optical observations
- GRB 161011A: RATIR Optical and NIR Observations
- GRB 161014A: Swift-XRT and UVOT afterglow detection
- GRB161014A: optical afterglow candidate with the LCOGT-FTS
- GRB 161014A: Swift detection of a burst
- GRB 161010A: Swift/UVOT Possible Detection
- GRB 161011A, Swift-BAT refined analysis
- GRB 161011A: TSHAO afterglow candidate
- GRB 161011A: Swift/UVOT Upper Limits
- GRB 161011A: Swift-XRT refined Analysis
- GRB 161011A: Enhanced Swift-XRT position
- GRB 161010A: Swift-XRT afterglow detection
- GRB 161011A: Swift detection of a burst
- GRB 161010A: a long GRB detected by INTEGRAL
- GRB 161007A: NOT optical observations
- GRB 161007A: AbAO optical observations
- GRB 161007A: Mondy optical observations
- GRB 161007A: Swift-BAT refined analysis
- GRB 161007A: Swift/UVOT Upper Limits
- GRB 161007A: Swift-XRT refined Analysis
- GRB 161007A: GTC observations
- GRB 161007A: Enhanced Swift-XRT position
- GRB 161004A: Maidanak optical observations
- GRB 161004A: refined analysis of TSHAO optical observations
- GRB 161007A: Swift detection of a burst
- GRB 160821A: Maisoncelles observatory optical observations
- GRB 160925A: Kottamia R-band observation
- GRB 160927A: GTC observations
- GRB 161004A: Swift-BAT refined analysis
- GRB 150302A: late-time imaging and optical afterglow confirmation
- GRB 161001A: IRSF upper limits
- GRB 161004B: Fermi GBM detection
- GRB 161004B: Swift/UVOT Upper Limits
- GRB 161004B: Swift-BAT refined analysis
- GRB 161004B: Swift-XRT refined Analysis
- GRB 161004A: RATIR Optical and NIR Observations
- GRB 161004B: Enhanced Swift-XRT position
- GRB 161004B: Swift detection of a burst
- GRB 161004A: SAO RAS optical upper limit
- GRB 161004A: Swift-XRT refined Analysis