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"23604 results found.
- GRB 080319C: Early Super-LOTIS Observations
- GRB 080319C: Swift detection of a burst with an optical afterglow
- GRB 080319b prompt optical observation by Pi-of-the-Sky
- GRB 080319A: optical observations at the NOT
- GRB0 080319B : LOAO optical observation
- GRB080319B Liverpool Telescope optical afterglow candidate
- GRB 080319B: Super-LOTIS Detection of a Bright OT
- GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
- GRB 080319A: Swift detection of a burst
- Swift Trigger 306745 is not a GRB
- Swift Trigger 306616 is not a GRB
- GRB080310, LBT and MDM photometry
- SAX J1818.6-1703: Swift detection (trigger 306379)
- GRB 080315: Optical observations
- GRB 080315: TAROT Calern observatory optical observations
- GRB 080315: Swift detection of a possible burst
- GRB080310 : Lulin Optical observations
- GRB080310 : Optical observations by LOAO and Lulin
- GRB080310: Optical observation by MITSuME telescope
- GRB 080307: GAO 150cm telescope Optical Observation
- GRB 080310, Swift-BAT refined analysis
- GRB080307: optical upper limit
- GRB 080310: Redshift from Keck/DEIMOS Spectra
- GRB 080310 - SDSS Pre-Burst Observations
- GRB 080310: Magellan redshift revision
- GRB 080310: Lick/Kast Spectroscopy
- GRB 080310: Magellan redshift
- GRB 080310: Swift detection of a burst with optical afterglow
- GRB080307 BOAO optical afterglow observation - detection of a possible OT
- GRB 080307, Swift-BAT refined analysis
- GRB080307 - SDSS Pre-Burst Observations
- GRB 080307: TNT optical observation
- GRB080307: Optical upper limits
- GRB 080307: BOAO imaging - retraction and new limit
- GRB 080307, Preliminary Swift-BAT refined analysis
- GRB 080307 : BOAO optical afterglow observation
- GRB 080307: Optical observation with DMC/KANATA
- GRB 080307: Swift detection of a burst
- GRB 080303, Swift-BAT refined analysis
- GRB 080303: Rapid PROMPT Detections
- Swift UVOT observations of GRB080229B
- GRB 080303A: Faulkes Telescope South optical afterglow observations
- GRB 080303: Swift detection of a burst with optical afterglow
- GRB 080229: TNG NIR observations
- GRB080229: Possible optical afterglow
- GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
- GRB 080229, Swift-BAT refined analysis
- GRB 080229: Faulkes Telescope South optical limit
- GRB 080229: Swift detection of a bright burst
- Early optical shallow decay in GRB 071112C
- GRB080207: optical observations
- GRB080205: optical observations
- GRB080211: optical observations
- GRB 071010B : Early optical brightening detected by TAOS
- GRB 080204: Suzaku WAM observation of the prompt emission
- GRB 080218B, Swift-BAT refined analysis
- GRB 080212: Mount Abu NIR observations
- GRB 080218A, Swift-BAT refined analysis
- GRB080218B: Watcher prompt limit
- GRB 080211: Suzaku WAM observation of the prompt emission
- GRB 080218B: Swift detection of a burst
- GRB 080218: Swift detection of a burst
- Swift-XRT and UVOT observations of the IPN burst GRB 080211
- GRB 080212: VLT optical rapid decay
- Konus-Wind observation of GRB 080211
- Swift/UVOT refined analysis of GRB080212
- GRB 080212, Swift-BAT refined analysis
- GRB080212: Optical afterglow candidate observed by MITSuME Telescope
- GRB 080212: GROND detects afterglow
- GRB 080212: optical observations
- GRB 080210: Keck photometry
- GRB 080212: Swift detection of a burst
- IPN localization of GRB 080211
- GRB 080207: optical observations.
- GRB 080210, Swift-BAT refined analysis
- GRB 080210: Super-LOTIS observations
- GRB 080210: VLT redshift
- GRB 080210: Rapid PROMPT Detections
- GRB080210 - SDSS Pre-Burst Observations
- GRB 080210: Swift detection of a burst with optical afterglow
- GRB 080210: TAROT La Silla observatory optical detection
- GRB 080207, Swift-BAT refined analysis
- GRB 080205: RTT150 optical observations
- Swift detection of AX J1749.1-2639
- GRB 080207, Swift-BAT refined analysis
- Swift Trigger 302777 is not a GRB
- GRB080207: RTT150 Optical Observations
- GRB 080207: TAROT Calern observatory optical observations
- GRB 080207: Swift detection of a burst
- Konus-Wind observation of GRB 080204
- GRB 080205, Swift-BAT refined analysis
- IPN localization of very hard GRB 080204
- GRB 080205: KAIT OA detection
- GRB 080205: Swift detection of a burst
- GRB 080130: Swift-BAT refined analysis
- GRB 080130: further Swift XRT observations confirm fading source
- Swift/UVOT observations of GRB080130
- GRB 080130(?): Swift XRT observation
- GRB 080129: Optical observations from OSN
- GRB 080129: Swift-XRT refined analysis