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"27323 results found.
- GRB 140423A: MITSuME Okayama Optical Observation
- Swift Trigger 596958 is positionally consistent with V* DG CVn/2XMM J133146.4+291635
- Swift Trigger 596958 is probably the flare star: DG CVn
- GRB 140423A: Enhanced Swift-XRT position
- GRB 140423A: Nanshan optical upper limit
- GRB 140423A: KWFC z-band photometry
- GRB 140419A, LOAO R-band observations
- GRB 140423A: Swift-XRT observations
- GRB 140423A: ROTSE-III Detection of Optical Counterpart
- GRB 140423A: optical afterglow candidate
- GRB 140419A: Mondy optical observations
- GRB 140419A: Continued RATIR Optical and NIR Observations
- GRB 140419A: Continued RATIR Optical and NIR Observations
- Swift Trigger 596641 is not a GRB
- GRB 140419A, Optical Observations
- GRB 140419A: MITSuME Ishigakijima Optical Observation
- GRB 140419A: MITSuME Okayama Optical Observation
- GRB 140419A: Swift UVOT refined analysis
- GRB 140419A: Swift-XRT refined Analysis
- GRB 140419A: Swift-BAT refined analysis
- GRB 140419A: Enhanced Swift-XRT position
- GRB 140419A: RATIR Optical and NIR Observations
- GRB 140419A: ROTSE-III Detection of Optical Counterpart
- GRB 140419A (Swift trigger 596426) : KAIT optical candidate
- GRB 140419A: Swift detection of a burst with optical afterglow
- GRB 140416A: Fermi GBM detection
- GRB 140414A: Swift/UVOT Upper Limit
- GRB 140414A: Swift-XRT observations
- GRB 140414A: TNG optical observations
- GRB 140413A: Swift/UVOT Observations of the Optical Afterglow
- GRB 140412A: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 140413A
- GRB 140413A: Swift-XRT refined Analysis
- GRB 140413A: Swift-BAT refined analysis
- GRB 140412A: Swift-XRT refined Analysis
- GRB 140412A: Swift-BAT refined analysis
- GRB 140413A: TAROT La Silla observatory optical observations
- GRB 140413A: Swift-XRT observations
- GRB 140412A: Enhanced Swift-XRT position
- GRB 140413A: GROND afterglow candidate
- GRB 140412A: Swift detection of a burst
- GRB 140408A: 1.5m OSN optical upper limit
- Swift Trigger 595345 is not an astrophysical source
- Swift-BAT trigger 595162 is noise
- GRB 140408A: MITSuME Akeno Optical observation
- Fermi418277210: iPTF optical observations
- GRB 140408A: RATIR Optical Upper Limits
- GRB 140408A: Swift-BAT refined analysis
- GRB 140408A: GROND Detection of an Afterglow Candidate
- GRB 140408A: Swift/UVOT Upper Limits
- GRB 140408A: Swift-XRT refined Analysis
- GRB 140408A: MITSuME Okayama upper limits
- GRB 140408A: Enhanced Swift-XRT position
- GRB 140408A: Swift detection of a burst
- GRB 140406A: Fermi GBM observation
- GRB 140402A: Deep limit on the optical afterglow from Magellan observations
- GRB 140331A: Continued RATIR Optical and NIR Observations
- GRB 140402A: Swift-XRT observations
- GRB 140402A: Marginal BAT detection
- Swift trigger 594286: Is likely a noise trigger
- GRB 140330A: Fermi GBM observation
- GRB 140331A: Swift-XRT refined Analysis
- GRB 140301A: Zadko observatory - Gingin optical observations
- GRB 140331A: Swift-BAT refined analysis
- GRB 140331A: Swift/UVOT Upper Limits
- GRB 140302A: TAROT La Silla observatory optical observations
- GRB 140323A: Zadko observatory - Gingin optical observations
- GRB 140330A: intense and persistent gamma-ray emission detected by AGILE
- GRB 140331A: Zadko observatory - Gingin optical observations
- GRB 140129B: AAO optical upper limit
- GRB 140129A: Mondy optical observations
- GRB 140331A: MITSuME Okayama upper limits
- GRB 140331A: Enhanced Swift-XRT position
- GRB 140331A: RATIR Optical and NIR Observations
- GRB 140331A: Swift detection of a burst
- GRB 140330A: Fermi-LAT Detection
- GRB 140329A: Fermi-LAT detection
- GRB 140329A: Fermi GBM observation of a bright burst
- GRB 140320D: Suzaku WAM observation of the prompt emission
- GRB 140323A : Suzaku WAM observation of the prompt emission
- GRB 140226A/iPTF14yb: Mondy optical observations
- GRB 140320C: Mondy optical observations and afterglow confirmation
- GRB 140323A: Fermi-LAT detection
- GRB 140323A: Swift-XRT refined Analysis
- GRB 140323A: Swift/UVOT Upper Limits
- GRB 140323A: Swift-BAT refined analysis
- GRB 140323A: Enhanced Swift-XRT position
- GRB 140323A: Swift detection of a burst
- GRB 140320A: RATIR Optical and NIR Observations
- IPN Triangulation of very intense GRB 140320D
- GRB 140320C: Mini-GWAC prompt observation
- GRB 140320C: Swift/UVOT Upper Limits
- GRB 140320A: Swift-BAT refined analysis
- GRB 140320B: Swift/UVOT Upper Limits
- GRB 140320A: Swift/UVOT Upper Limits
- GRB 140320C: Swift-XRT observations
- GRB 140320A: Confirmation of a fading X-ray afterglow
- GRB 140320C: Swift-XRT detection of the X-ray afterglow
- GRB 140320A: Fermi GBM detection
- GRB 140320B: Swift-XRT detection of the afterglow