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"27029 results found.
- Correction to Swift GCN Circular 13538
- GRB 120729A: Swift/UVOT Detection
- Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
- GRB 120729A, Swift-BAT refined analysis
- GRB 120728A, Swift-BAT refined analysis
- GRB 120728A: Swift/UVOT Upper Limits
- GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
- GRB 120729A: Swift detection of a burst with an optical afterglow
- GRB 120728A: Swift-XRT refined Analysis
- Trigger 529076: Swift possible detection of SwJ1910.2-0546
- GRB 120728A: GROND observations
- GRB 120728A: Swift detection of a burst
- GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
- Swift Trigger 528925 is probably a noise fluctuation
- GRB 120724A: JCMT SCUBA-2 sub-mm observation
- GRB 120724A, Swift-BAT refined analysis
- GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
- GRB 120724A: Swift-XRT refined Analysis
- GRB 120724A: FTN optical afterglow candidate
- GRB 120724A: Swift detection of a burst
- GRB 120722A: Swift/UVOT Upper Limits
- GRB 120722A: GROND detection of the afterglow
- GRB 120722A: Swift-XRT refined Analysis
- GRB 120722A: Swift-BAT refined analysis
- GRB 120722A: Swift detection of a burst
- GRB 120716A: Fermi GBM observation
- GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
- VLT/FORS2 redshift of GRB120716A
- GRB 120716A: GROND confirmation of the optical/NIR afterglow
- GRB 120716A: Optical decay from NOT
- GRB 120716A: Candidate Optical Afterglow from PTF
- IPN Triangulation of unusual GRB 120716A
- Fermi GBM trigger 120716.498 is not a GRB
- GRB 120714B: Swift/UVOT Detection
- GRB 120714B: Swift-XRT refined Analysis
- GRB120714A: Swift/UVOT upper limits
- GRB 120714B: Swift-BAT refined analysis
- Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
- GRB 120714A: GROND upper limits
- GRB 120714B: GROND confirmation of fading afterglow
- GRB 120714A: Swift-XRT refined Analysis
- Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
- GRB 120714B: Position Correction and Candidate Optical Afterglow
- GRB 120714A: Swift-BAT refined analysis
- GRB 120714B: Swift detection of a burst
- GRB 120712A: Fermi GBM observation
- GRB120714A: UVOT non-detection
- GRB 120714A: Swift-XRT observations
- GRB 120714A: Swift detection of a burst
- GRB 120712A: Swift/UVOT Detection
- GRB 120712A: VLT/Xshooter redshift
- GRB 120712A: Swift-XRT refined Analysis
- GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
- GRB 120712A: Swift-BAT refined analysis
- GRB 120712A: Swift detection of a burst with optical afterglow
- GRB 120711B: Swift-XRT refined Analysis
- GRB 120711A: Fermi LAT Detection
- GRB 120711B: Swift-BAT refined analysis
- GRB 120711B: Swift/UVOT Upper Limits
- GRB 120711A: Swift/UVOT Observations
- GRB 120709A: Swift/UVOT Observations
- Konus-Wind observation of GRB 120711A
- GRB 120711A: MASTER early OT detection
- GRB 120711A: Swift-XRT observations
- Konus-Wind observation of GRB 120709A
- GRB 120711A: GROND photometric redshift
- GRB 120711A: Fermi GBM observation
- Continued Skynet/PROMPT observations of GRB120711A
- GRB 120711A: ROTSE-III confirm of Optical Counterpart
- Swift detection of GRB 120711B or a new Galactic transient
- Skynet/PROMPT Observations of GRB120711A
- GRB 120709A: Fermi GBM detection
- GRB 120709A: Swift-XRT observations
- GRB 120709A: Matched filter analysis of Fermi-LAT data
- Konus-Wind observation of GRB 120707A
- IPN Triangulation of GRB 120707A
- GRB 120709A: Fermi-LAT Detection
- GRB 120707A: Fermi GBM Detection of a Bright Burst
- GRB 120703A: Swift/UVOT Detection
- GRB 120703A: Fermi GBM detection
- GRB 120703A: Swift-XRT refined Analysis
- GRB 120703A: Swift-BAT refined analysis
- GRB 120624B Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 120703A
- GRB 120703A: NOT optical observation
- GRB 120701A: Swift/UVOT Detection
- GRB 120701A: GROND detection of the afterglow
- GRB 120703A: Swift detection of a bright burst with an optical afterglow
- Swift Trigger 525554 is noise
- GRB 120701A: Swift-XRT afterglow detection and analysis
- GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
- GRB 120701A: Swift-BAT refined analysis
- GRB 120630A: NOT optical source within the XRT error circle
- Swift Trigger 525554 is probably not a GRB
- Fermi Gamma-ray Burst Monitor trigger 120628.973 is not a GRB
- GRB 120624B: Swift/UVOT Upper Limits
- Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
- GRB 120624B: Swift-XRT observations
- GRB 120624B: GROND upper limits
- Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)