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"27415 results found.
- GRB 130702A: NOT optical observations
- GRB 130702A: TNG optical observations
- GRB 130702A / Fermi394416326 : Nanshan optical observations
- Fermi GRB 130702A: Swift XRT and UVOT observations
- GRB 130702A / Fermi394416326: Fermi GBM detection
- GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
- Fermi GBM trigger 394416326: MASTER early optical limit
- GRB 130628A: Fermi GBM detection
- Fermi394416326: iPTF detection of a possible optical afterglow
- Fermi GBM trigger 394325281 / 130630950 is not a GRB
- GRB 130701B: Fermi GBM detection
- GRB 130701A: Swift-XRT refined Analysis
- GRB 130701A: P60 Observations
- GRB 130701A, Swift-BAT refined analysis
- Konus-Wind observation of GRB 130701A
- GRB 130701A: Swift/UVOT Detection
- GRB 130701A: Swift detection of a burst
- GRB 130627B, Swift-BAT refined analysis
- GRB 130627A, Swift-BAT refined analysis
- GRB 130627B: Swift/UVOT Upper Limits
- GRB 130627A: Swift/UVOT Upper Limits
- GRB 130627A: Swift-XRT refined Analysis
- GRB 130627B: Possible Swift-XRT afterglow detection
- Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
- GRB 130626A: RATIR Optical Observations
- GRB 130626A, Swift-BAT refined analysis
- GRB 130627A: Fermi GBM detection
- GRB 130623A: Fermi GBM detection
- GRB130627B: Swift/UVOT Observations
- GRB 130627B: Swift-XRT observations
- GRB 130626A: Swift-XRT possible detection and UVOT upper limits
- GRB 130627B: Swift detection of a burst
- GRB 130627A: Swift-XRT observations
- GRB 130627A: Swift/UVOT Observation
- GRB 130627A: Swift detection of a burst
- Swift Trigger 559108 is not astrophysical
- GRB 130626A: Swift detection of a short burst
- GRB 130625A: Swift-XRT refined Analysis
- GRB 130625A: Swift/UVOT Upper Limits
- GRB 130623A: Swift-XRT and UVOT observations
- GRB 130625A: Swift-BAT refined analysis
- GRB 130625A: Swift detection of a burst
- GRB 130623A detected in ground analysis of Swift-BAT data
- Swift Trigger 558828 is not an interesting event
- Swift Trigger 558631: AAO optical observations
- Swift Trigger 558631 is not a real source
- GRB 130612A: Swift-BAT refined analysis
- GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
- GRB 130603B: Analogy with GRB 090510A and possible connection with a supernova
- Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
- Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
- Swift Trigger 557910 is not astrophysical
- GRB 130615A: Continued Skynet/PROMPT Observations
- GRB 130610A: TAROT La Silla observatory optical observations
- GRB 130615A: Zadko observatory - Gingin optical observations
- GRB 130615A: TAROT La Silla observatory optical observations
- GRB 130615A: Swift-XRT refined Analysis
- GRB 130614A: Fermi GBM detection
- GRB 130615A: Swift/UVOT Upper Limits
- GRB 130615A: Skynet/PROMPT Observations
- GRB 130615A: Swift-BAT refined analysis
- GRB 130615A: GROND afterglow candidate
- GRB 130615A: Swift detection of a burst
- GRB 130612A: Fermi GBM observation
- GRB 130612A: Swift/UVOT Detection
- GRB 130612A: Swift-XRT refined Analysis
- GRB 130612A: Zadko observatory - Gingin optical observations
- GRB 130612A: TAROT La Silla observatory optical observations
- GRB 130612A: RATIR Optical Observations
- GRB 130612A: P60 Observations
- GRB 130612A: Skynet/PROMPT detection of the optical afterglow
- GRB 130612A: PAIRITEL NIR Afterglow Observations
- GRB 130612A: Liverpool Telescope Afterglow detection
- GRB 130612A: Swift detection of a burst with an optical counterpart
- GRB 130609A: Swift/UVOT Upper Limits
- GRB 130608A: Swift/UVOT Upper Limits
- GRB 130609B: Fermi GBM observation
- GRB 130609B, Further Swift-BAT refined analysis
- GRB 130609B: GROND observations
- GRB 130609B, Swift-BAT refined analysis
- GRB 130610A: Swift/UVOT Observations
- GRB 130610A: Fermi GBM Observation
- GRB 130609B: Swift/UVOT Observations
- Konus-Wind observation of GRB 130609B
- GRB 130606B: Swift/UVOT Upper Limit
- GRB 130610A: Swift-XRT refined Analysis
- GRB 130609B: Swift-XRT refined Analysis
- GRB 130608A: Further Swift-BAT analysis
- GRB 130610A, Swift-BAT refined analysis
- GRB 130610A: P60 Observations
- GRB 130610A: PAIRITEL NIR Afterglow Observations
- GRB 130610A: Skynet/PROMPT detection of the optical afterglow
- GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
- GRB 130610A: Swift detection of a burst with an optical counterpart
- GRB 130609B: Swift detection of a burst with an optical counterpart
- GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
- GRB 130609A: Fermi GBM observation
- GRB 130608A: Swift-XRT refined Analysis
- GRB 130609A: Swift-XRT refined Analysis
- GRB 130608A: RATIR Optical and NIR Observations