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"40632 results found.
- GRB 140423A: Swift-XRT refined Analysis
- GRB 140423A: Swift-BAT refined analysis
- 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: Further Observations with Swift/UVOT
- GRB 140423A: KAIT Optical Detection
- GRB 140423A: Nanshan optical upper limit
- GRB 140423A: P60 Observations
- GRB 140423A: Fermi GBM observation
- GRB 140423A: KWFC z-band photometry
- GRB 140423A: Gemini-N redshift
- GRB 140419A, LOAO R-band observations
- GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
- GRB 140423A: Swift/UVOT detection of a possible counterpart
- GRB 140423A: Swift-XRT observations
- GRB 140423A: ROTSE-III Detection of Optical Counterpart
- GRB 140423A optical observations with pODI/WIYN at KPNO
- GRB 140423A: optical afterglow candidate
- GRB 140423A: Swift detection of a burst
- GRB 140419A: Mondy optical observations
- GRB 140419A: Refined NOT photometry
- GRB 140419A: Continued RATIR Optical and NIR Observations
- GRB140419A: NOT optical observations
- GRB 140419A: KAIT Refined Analysis
- GRB 140419A: Continued RATIR Optical and NIR Observations
- Swift Trigger 596641 is not a GRB
- Konus-Wind observation of GRB 140419A
- GRB 140419A, Optical Observations
- GRB 140419A: MITSuME Ishigakijima Optical Observation
- GRB 140419A: MITSuME Okayama Optical Observation
- GRB 140419A: Swift UVOT refined analysis
- GRB 140419A: P60 Observations
- GRB 140419A: Swift-XRT refined Analysis
- GRB 140419A: Swift-BAT refined analysis
- GRB 140419A: Gemini-N redshift
- GRB140419A: UVOT detects fading afterglow in white but not in u filter
- GRB 140419A: CARMA early 3mm detection
- 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
- Konus-Wind observation of GRB 140416A
- IPN Triangulation of GRB 140416A (long/very intense)
- GRB 140416A: Fermi GBM detection
- GRB 140414A: Swift/UVOT Upper Limit
- GRB 140414A: Swift-XRT observations
- GRB 140414A: TNG optical observations
- GRB 140414A: Swift-BAT refined analysis
- GRB 140414A: Short burst found in ground analysis of BAT slew data
- 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: GROND afterglow candidate
- Swift Trigger 595616: a possible GRB
- 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: Fermi GBM detection
- Swift Trigger 595162: a possible GRB
- GRB 140408A: Swift detection of a burst
- GRB 140406A: Fermi GBM observation
- GRB 140402A: Deep limit on the optical afterglow from Magellan observations
- GRB 111225A: Archeological redshift of the Christmas Burst 2011 from GTC
- GRB 140402A: Swift/UVOT Upper Limits
- GRB 140331A: Continued RATIR Optical and NIR Observations
- GRB 140402A: Swift-XRT observations
- GRB 140402A: MASTER optical observations
- GRB 140402A BAT refined analysis
- GRB 140402A : Xinglong TNT upper limit
- GRB 140402A: Marginal BAT detection
- GRB 140402A: Fermi GBM detection
- GRB 140402A: Fermi-LAT detection of a burst
- Swift trigger 594286: Is likely a noise trigger
- GRB 140219A: Correction to GCN 15885 (Suzaku-WAM fluence)
- GRB 140330A: Fermi GBM observation
- GRB 140331A: Swift-XRT refined Analysis
- GRB 140301A: Zadko observatory - Gingin optical observations
- GRB 140331A: Swift-BAT refined analysis
- Retraction of the Fermi/LAT high-energy counterpart for GRB 140330A
- 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
- Konus-Wind observation of GRB 140330A