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"27393 results found.
- 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
- GRB 130609A, Swift-BAT refined analysis
- GRB 130608A: Swift-BAT refined analysis
- GRB 130609A: RATIR Optical and NIR Observations
- GRB 130609A: P60 nondetection
- GRB 130609A: Swift detection of a burst
- GRB 130608A: Swift detection of a burst
- GRB 130606A: Continued Skynet/PROMPT observations
- Swift Trigger 557674 was due to an onboard position error
- GRB 130606A: Continued RATIR Optical and NIR Monitoring
- GRB 130606B: RATIR Optical and NIR Observations
- Swift Trigger 557674 is a probable new Galactic transient
- GRB 130606B: Swift-XRT observations
- GRB 130606A, Swift-BAT refined analysis
- GRB 130606A: TAROT Calern observatory early optical observations
- GRB 130606A: Skynet/PROMPT detection of the optical afterglow
- GRB 130606A: Swift/UVOT Upper Limits
- GRB 130606A: Swift-XRT refined Analysis
- Konus-Wind observation of GRB 130605A
- Konus-Wind observation of GRB 130606A
- GRB 130606A: GROND Detection of the Optical/NIR Afterglow
- Trigger 557640: Swift detection of burst from SGR J1745-29
- GRB 130606A: PAIRITEL NIR Afterglow Observations