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.
- Swift Trigger 810300 is a probable new Galactic source: Swift J1658.2-4242
- GRB 180210A: Swift-XRT afterglow detection
- GRB 180210A: Tiled Swift observations
- Retraction of Swift trigger 809374
- GRB 180210A: Swift ToO observations
- GRB 180210A: Fermi-LAT detection
- Trigger 809374: Swift detection of a possible non-burst faint source
- Trigger 809217: Swift trigger on RS CVn Star HD 8357
- Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
- GRB 180205A: confirmation of Swift-BAT trigger time.
- GRB 180205A: Swift/UVOT Detection
- GRB 180205A: Swift-XRT refined Analysis
- GRB 180205A: Swift-BAT refined analysis
- GRB 180205A: Further GROND Observations reveal Afterglow is still bright
- Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
- GRB 180205A: Fermi GBM observation
- Konus-Wind observation of GRB 180204A
- GRB 180205A: VLT/X-shooter redshift
- GRB 180205A: GROND detection of the NIR/optical afterglow
- GRB 180205A: KAIT optical afterglow confirmation
- GRB 180205A: Swift detection of a burst with a bright optical counterpart
- GRB 180204A: Swift-BAT refined analysis
- GRB 180204A: Swift/UVOT Upper Limits
- GRB 180204A: Fermi GBM detection
- GRB 180204A: Enhanced Swift-XRT position
- GRB 180204A: Swift-XRT refined Analysis
- GRB 180204A: Swift detection of a short burst
- GRB 180113A: AstroSat CZTI detection
- GRB 180115A: SEDM Observations
- Konus-Wind observation of GRB 171209A
- GRB 180115A: Swift/UVOT Detection
- GRB 180112A: Insight-HXMT/HE detection/observation
- GRB 180111A AROMA-N optical observation
- IPN Triangulation of GRB 180113C
- GRB 180115A: Swift-BAT refined analysis
- Konus-Wind observation of GRB 180113A
- GRB 180111A: Insight-HXMT/HE observation
- GRB 180113A: Swift ToO observations
- GRB 180115A: Swift-XRT refined Analysis
- GRB 180115A: Enhanced Swift-XRT position
- Konus-Wind observation of GRB 180111A
- GRB 180115A: Swift detection of a burst with an optical counterpart.
- GRB 180113A: Swift-BAT refined analysis
- GRB 180111A: AbAO optical observations
- GRB 180113A: KAIT Optical Observations
- GRB 180113A: Fermi GBM observation
- GRB 180111A: Swift/UVOT Detection
- GRB 180103A: Swift-XRT afterglow detection
- GRB 180113A: Swift detection of a burst
- GRB 180111A: Swift-BAT refined analysis
- GRB 180111A: RATIR Optical and NIR Observations
- GRB 180111A: Swift-XRT refined Analysis
- GRB 180111A: AGILE/MCAL detection
- GRB 180111A: Enhanced Swift-XRT position
- GRB 180111A: Swift detection of a burst with an optical counterpart
- GRB 180103A: LCO Sutherland 1-m telescope observations
- Konus-Wind observation of GRB 180103A
- GRB 180103A: AstroSat CZTI detection
- GRB 180103A: Swift/UVOT Upper Limits
- GRB 180103A: Swift-XRT observations
- GRB 180103A: Swift ToO observations
- GRB 180103A: Swift detection of a burst
- GRB 180102A AROMA-N optical observation
- GRB 180102A: Swift-BAT refined analysis
- GRB 180102A: Swift/UVOT Upper Limits
- GRB 180102A: MASTER-Net robotic report
- GRB 180102A: Swift-XRT refined Analysis
- GRB 180102A: Fermi GBM detection
- GRB 180102A: Enhanced Swift-XRT position
- GRB 180102A: Prompt enhanced Swift-XRT position
- GRB 180102A: Swift detection of a burst
- IceCube-171106A: Konus-Wind upper limits
- GRB 171222A: Swift-BAT refined analysis
- GRB 171222A: AROMA-N optical observation
- GRB 171222A: Fermi GBM detection
- GRB 171222A: Swift/UVOT Upper Limits
- GRB 171222A: MASTER-Net OT observations
- GRB 171222A: Swift-XRT refined Analysis
- GRB 171222A: Enhanced Swift-XRT position
- GRB 171222A: Swift detection of a burst
- GRB 171216A: Swift/UVOT Upper Limits
- GRB 171210A: Further Swift-XRT observations
- GRB 171216A: Swift-XRT refined Analysis
- GRB 171216A: Swift-BAT refined analysis
- GRB 171216A: Enhanced Swift-XRT position
- GRB 171216A: Swift detection of a burst
- Swift Trigger 797070: KAIT Optical Observations
- Swift Trigger 797070 is probably not a GRB
- GRB 171212A/Swift J1935.7+2036: Swift-BAT refined analysis
- GRB 171212A: Swift-XRT refined Analysis
- GRB 171211A iTelescope observation
- GRB 171212A/Swift J1935.7+2036: Swift/UVOT Upper Limits
- GRB 171212A/Swift J1935.7+2036: TSHAO optical observations
- GRB 171212A: Enhanced Swift-XRT position
- GRB 171212A: Swift detection of a burst or a Galactic transient
- GRB 171211A: Swift-BAT refined analysis
- GRB 171211A: Swift-XRT refined Analysis
- GRB 171211A: Swift/UVOT Upper Limits
- GRB 171209A: MASTER-Net optical observations
- GRB 171211A: Enhanced Swift-XRT position