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"26216 results found.
- GRB 100414A: Swift/UVOT Observations
- GRB 100414A: GROND Detection of the Optical Afterglow
- GRB 100413A: Suzaku WAM observation of the prompt emission
- GRB 100414A: Palomar Transient Factory Observations
- GRB 100413B: Swift Confirmation of Burst
- GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
- GRB 100413A: Swift-BAT final refined analysis
- GRB 100414A: Fermi GBM detection
- GRB100414A: Fermi LAT detection
- GRB 100413B : Swift detection of a burst
- GRB 100413A: GROND Upper limits
- GRB 100413A: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 100413A
- GRB 100413A: Faulkes Telescope South observations
- GRB 100413A: SARA upper limit
- GRB 100413A: Swift-XRT Refined Analysis
- GRB 100413A: Swift-BAT initial refined analysis
- GRB 100413A: Swift detection of a burst
- Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
- Swift-BAT trigger 419015 is not astrophysical
- Trigger 419015 is probably not a GRB
- MASTER observations on the Swift second trigger on LS V +44 17
- IBAS Alert n. 5996: not a GRB
- IBAS Alert n. 5995: not a GRB
- GRB 100331B: GROND Upper limits
- Master-Net observations on the Swift trigger on LS V +44 17
- GRB 100401A: Swift/UVOT Upper Limit
- Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
- GRB 100401A: Fermi GBM detection
- GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
- GRB 100324B: Suzaku WAM observation of the prompt emission
- GRB 100331B: Swift/XRT possible afterglow candidate
- Swift detection of LS V +44 17
- INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
- INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
- Konus-Wind observation of GRB 100322A
- Fermi GBM detection of four Solar Flares
- GRB 100322A: Suzaku WAM observation of the prompt emission
- Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
- GRB 100325A: Fermi LAT detection
- GROND observations of GRB100316D/SN2010bh
- GRB 100325A: Fermi GBM detection
- GRB 100324A found in ground analysis of BAT data
- GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
- GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
- SGR 1833-0832: Swift/UVOT Upper Limits
- GRB 100322A: Fermi GBM detection
- Probable SGR 1833-0832: Swift-XRT refined analysis
- Swift-XRT refined position of the probable new SGR 1833-0832
- Swift-BAT refined analysis of the probable new SGR 1833-0832
- GRB 100319A: Swift detection of a burst; possible SGR
- GRB 100316D: Pre-burst emission measured by BAT
- GRB 100316D: Swift/UVOT Observations
- GRB 100316D: Swift XRT enhanced position and further refined analysis
- GRB 100316B: Swift-XRT refined analysis
- GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
- Trigger 416226 is probably not a GRB
- GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
- GRB 100316D: Swift-BAT refined analysis
- GRB100316C: Swift/UVOT Upper Limits
- GRB 100316C: Swift-BAT refined analysis
- GRB 100316B: Swift/UVOT observations
- GRB 100316C: Swift-XRT team refined analysis
- GRB 100316D: Swift XRT refined analysis
- GRB 100316A: TAROT Calern observatory optical observations
- GRB 100316A: Swift-XRT refined analysis
- GRB 100316A: Swift-BAT refined analysis
- GRB 100316B: Swift-BAT refined analysis
- GRB100316A: Swift/UVOT Upper Limits
- Trigger 416140 is almost certainly not a GRB
- GRB 100316D: Swift detection of a burst
- GRB 100316B: Skynet/PROMPT Observations of Fading
- GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
- GRB 100316C: Swift detection of a burst
- GRB 100316B: Swift detection of a burst with optical counterpart
- GRB 100316A: Swift/UVOT Observations
- GRB 100316A: Swift-XRT detection
- GRB 100316A: Swift detection of a burst
- IBAS Alert 5992 is not a GRB, but XTE J1855-026
- GRB 100305A: Super-LOTIS early observations
- GRB 100305A, Swift-BAT refined analysis
- GRB 100305A: Swift/UVOT Upper Limits
- GRB 100305A: Swift-XRT refined analysis
- GRB 100305A Optical Observations
- GRB 100305A: PAIRITEL NIR Upper Limits
- GRB 100305A: Swift detection of a burst
- GRB 100302A: Ondrejov 65cm limit
- GRB 100302A: Swift/UVOT Upper Limits
- GRB 100302A: Swift-XRT refined analysis
- GRB 100302A: Optical observations at Crni Vrh
- GRB 100302A, Swift-BAT refined analysis
- GRB 100302A: Skynet/DAO Observations
- GRB 100302A: Swift detection of a burst
- GRB 100224B: Fermi GBM detection
- GRB 100219A: GAO 150cm telescope Optical Observation
- GRB 100224A SHB found in ground analysis of BAT data
- GRB 100225A: Fermi LAT detection
- GRB 100225A: Fermi GBM detection
- GRB 100223A: Fermi GBM detection
- GRB