GCN Circulars
GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"19666 results found.
- GRB 181003A: Swift-XRT afterglow detection
- GRB 180925A: Astrosat CZTI detection
- GRB 181003A: Swift/UVOT Upper Limits
- GRB 181002A: Swift-XRT refined Analysis
- GRB 181003A: LCO Cerro Tololo observations
- GRB 181003A: MASTER optical observation
- GRB181002A: GOTO optical limits
- GRB 181002A: Swift/UVOT Upper Limits
- GRB 181003A: Swift-XRT observations
- GRB 181003A: Swift detection of a burst
- GRB 181002A: Swift-BAT refined analysis
- GRB 181002A: MASTER optical observation
- GRB 181002A: Enhanced Swift-XRT position
- Konus-Wind observation of GRB 180925A
- GRB 181002A: Swift detection of a burst
- Trigger 864882: Swift detection of Crab in its normal state
- GRB 180930A: Swift-BAT refined analysis
- GRB 180930A: Swift-XRT refined Analysis
- GRB 180930A: Swift/UVOT Upper Limits
- GRB 180930A: Enhanced Swift-XRT position
- GRB 180930A: KAIT Optical Upper Limit
- GRB 180930A: Prompt enhanced Swift-XRT position
- GRB 180930A: Swift detection of a burst
- GRB 180924A: Swift/UVOT Upper Limits
- GRB 180925A: Insight-HXMT/HE detection
- GRB 180925A: Swift/UVOT Detection
- GRB 180925A: Swift-BAT refined analysis
- GRB 180925A: Swift-XRT refined Analysis
- GRB 180925A: Enhanced Swift-XRT position
- GRB 180925A: Prompt enhanced Swift-XRT position
- GRB 180925A: Swift detection of a burst
- GRB 180924A: MASTER inspection
- GRB 180924A: Swift-XRT refined Analysis
- GRB 180924A: Swift-BAT refined analysis
- GRB 180924A: Enhanced Swift-XRT position
- GRB 180924A: Swift detection of a burst
- Swift Trigger 863053 is not an astrophysical event
- GRB180914B: Swift UVOT position correction to circ. 23241
- GRB 180914B: AstroSat CZTI detection
- GRB 180914A: AstroSat CZTI detection
- GRB 180914B: AGILE/MCAL refined analysis
- GRB180914B: Swift UVOT detection of an optical afterglow
- GRB 180914B: RATIR Optical and NIR Observations
- GRB 180914B: KAIT Optical Afterglow Candidate
- GRB 180914B: Swift-XRT afterglow detection
- GRB 180914A: RATIR Optical and NIR Observations
- GRB 180914B: Tiled Swift observations
- GRB 180914B: Fermi-LAT detection
- GRB 180914A: Swift-XRT observations
- GRB 180914A: Tiled Swift observations
- GRB 180914A: Fermi-LAT detection
- GRB 180905A: Swift/UVOT Upper Limits
- GRB 180905A, Swift-BAT refined analysis
- GRB 180905A: RATIR Optical and NIR Observations
- GRB 180905A: Swift-XRT refined Analysis
- GRB 180904A: BOOTES-2/TELMA early observations
- GRB 180905A: BOOTES-3/YA optical observations
- GRB 180905A: Enhanced Swift-XRT position
- GRB 180904A: AbAO optical upper limit
- GRB 180904A: Swift/UVOT Upper Limits
- GRB 180904A: Swift-BAT refined analysis
- GRB 180905A: Swift detection of a burst
- GRB 180904A: Swift-XRT refined Analysis
- GRB 180904A: LT early observations
- GRB 180904A: SAO RAS optical observations
- GRB 180904A: OSN observations
- GRB 180904A: Enhanced Swift-XRT position
- GRB 180904A: Swift detection of a burst
- Konus-Wind observation of GRB 180828A
- GRB 180829A: Swift-XRT observations
- GRB 180828A: AstroSat CZTI detection
- GRB 180828A: Swift/UVOT Upper Limits
- GRB 180828A: RATIR Optical and NIR Observations
- GRB 180828A: Swift-BAT refined analysis
- GRB 180829A: Tiled Swift observations
- GRB 180828A: Swift-XRT refined Analysis
- GRB 180828A / Swift J1754.9-2548: Enhanced Swift-XRT position
- GRB 180828A: Fermi GBM observation
- GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
- GRB 180818B: TSHAO optical upper limit
- GRB 180823A, Swift-BAT refined analysis
- IPN Triangulation of GRB 180824A (short)
- GRB 180823A: Swift/UVOT Upper Limits
- GRB 180823A: RATIR Optical and NIR Observations
- GRB 180823A: Swift-XRT refined Analysis
- GRB 180823A: Enhanced Swift-XRT position
- GRB 180823A: Swift detection of a burst
- GRB 180821A: VLT observations
- GRB 180821A: Swift/UVOT Upper Limits
- GRB 180821A: Swift-BAT refined analysis
- GRB 180821A: iTelescope counterpart is not the afterglow
- GRB 180821A: Swift-XRT refined Analysis
- GRB 180821A: LCO Siding Springs observations
- GRB 180821A: Enhanced Swift-XRT position
- GRB 180818B: 1.5m OSN optical afterglow candidate
- GRB 180821A: iTelescope optical afterglow detection
- GRB 180821A: BOOTES-3/YA optical observations
- GRB 180821A: Swift detection of a burst
- GRB180806A: confirmation of the X-ray afterglow
- GRB 180818B: Swift-XRT refined Analysis