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"8296 results found.
- 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 130609A: Swift detection of a burst
- GRB 130608A: Swift detection of a burst
- GRB 130606A: GROND Detection of the Optical/NIR Afterglow
- GRB 130606A: Swift detection of a burst
- GRB 130604A: Swift-BAT refined analysis
- GRB 130605A: GROND afterglow candidate
- GRB 130605A: Swift detection of a burst
- Swift Trigger 557466 is probably not real.
- GRB 130604A: further ISON-NM optical observation
- GRB 130604A: ISON-NM optical upper limit
- GRB 130604A: P60 optical afterglow candidate
- GRB 130604A: Swift detection of a burst
- GRB 130603B: WHT optical afterglow candidate
- GRB 130603B: Swift-BAT refined analysis
- GRB 130603B: Swift detection of a bright short burst
- GRB 130529A: Swift detection of a burst
- GRB 130528A: Swift detection of a burst
- GRB 130527A: Swift detection of a bright burst
- Swift Trigger 556533 is probably not an astrophysical event
- GRB 130515A: FORS2 spectroscopy of candidate counterpart
- GRB 130515A: Fermi GBM detection
- GRB 130515A: Swift detection of a short burst
- GRB 130514A: Swift detection of a burst
- GRB 130511A, Swift-BAT refined analysis
- GRB 130511A: Swift detection of a burst with an optical counterpart
- Fermi Trigger 130507.091 - Detection of a SGR-like Burst
- GRB 130508A: Swift detection of a probable burst
- GRB 130427A, LBT optical spectrum
- GRB 130505B: Swift Candidate Afterglow
- GRB 130504A: IAC80 optical candidate
- GRB 130505A: Swift detection of a burst with optical afterglow
- GRB 130504A: Bassano Bresciano Observatory optical upper limit
- GRB 130504A, Swift-BAT refined analysis
- Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
- Trigger 555096: Swift detection of a possible burst
- GRB 130502A: Fermi GBM detection
- GRB 130502A: Swift/UVOT Upper Limits
- GRB 130502B: P60 Observations
- GRB 130502A: TNG candidate counterpart
- GRB 130502A: Swift detection of a burst
- Konus-Wind observation of GRB 130427A
- GRB 130427A: Fermi GBM observation
- GRB 130427B: Swift detection of a burst with optical counterpart
- GRB 130418A: WSRT radio observation
- Swift Trigger 554135 is probably not a GRB or transient
- GRB 130420B: Swift detection of a burst
- GRB 130420A: ROTSE-III Detection of Optical Counterpart
- GRB 130420A: Swift detection of a burst with an optical counterpart
- GRB 130420A: Faulkes Telescope North candidate
- GRB 130418A: Bassano Bresciano Observatory optical observations
- GRB 130418A: Swift detection of a burst with an optical counterpart
- GRB 130408A, Swift-BAT refined analysis
- GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
- GRB 130408A: Liverpool Telescope Optical candidate detection
- GRB 130407A Tiled Swift observations
- GRB 130211A: Retraction of afterglow candidate
- GRB 130310A: RATIR Observations
- Swift Trigger 552142: a possible GRB
- GRB 130325A Tiled Swift observations
- GRB 130327A: PAIRITEL NIR Afterglow Candidate
- GRB 130327A: Swift detection of a burst
- GRB 130315A: GROND afterglow candidate
- GRB130313A: GTC early optical limits
- GRB 130315A: Swift detection of a burst
- GRB130313A: Optical observations from GTC
- GRB 130313A: Swift detection of a short burst
- Swift XRT RETRACTION of GRB 130310A afterglow detection
- Konus-Wind observation of GRB 130310A
- GRB 130310A: Fermi-LAT detection and localization
- GRB 130305A: Fermi LAT Detection
- GRB 130216A: possible radio counterpart is steady field source
- GRB 130216A: Further Swift-BAT refined analysis
- GRB 130215A: Fermi GBM detection
- GRB 130215A: Redshift estimate
- GRB 130215: ROTSE-III Detection of Optical Counterpart
- GRB 130211A: Swift detection of a burst
- GRB 130206A: Fermi LAT Observations
- GRB 130131A: RATIR optical and infrared upper limits
- GRB 130131B: Swift detection of a burst
- GRB 130131A - UKIRT afterglow candidate
- GRB 130131A: Swift detection of a burst
- GRB 130122A: Swift-BAT refined analysis
- GRB 130122A: T100 observations
- GRB 130122A: Swift detection of a burst with an optical counterpart
- GRB 130102A: Swift detection of a burst
- GRB 121229A: Swift detection of a burst
- GRB 121226A: Swift detection of a burst
- GRB 121225B: Fermi LAT Detection
- GRB 121217A: Swift detection of a burst
- GRB 121212A: Swift detection of a burst
- GRB 121211A - Faulkes Telescope North afterglow confirmation
- GRB 121211A: Swift detection of a burst with an optical counterpart
- GRB 121209A: Keck observations
- GRB 121209A: CARMA 3mm Observations
- GRB 121209A: GROND optical afterglow candidate
- GRB 121209A: UVOT Observation
- GRB 121128A: Optical Observations