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"12091 results found.
- Konus-Wind observation of GRB 080605
- GRB 080607: Keck/LRIS spectroscopy and redshift
- GRB 080605, Swift-BAT refined analysis
- GRB 080605, Swift-BAT refined analysis
- GRB 080605: MASTER VWF 46 s AT observation
- Swift/UVOT observations of GRB080604
- Konus-Wind observation of GRB 080603B
- GRB 080603B, Swift-BAT refined analysis
- GRB 080603A: Swift/UVOT detection of the afterglow
- GRB080603B: RTT150 optical observations, break in light curves
- GRB 080604: Early Super-LOTIS Observations
- GRB080604: confirmation of optical afterglow
- GRB 080604: Swift detection of a burst with an optical afterglow
- GRB 080516: TAROT La Silla observatory optical observations
- GRB 080603B: BOOTES2/TELMA optical observations
- GRB 080603: A long GRB detected by INTEGRAL
- SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
- Konus-Wind observation of GRB 080602
- Swift analysis of BAT Slew Survey event (Trigger=009)
- Konus-Wind observation of reactivation of SGR 1627-41
- Reactivation of SGR 1627-41
- GRB 080515: KPNO 4m NIR afterglow detection
- GRB 080515: Swift-XRT position and analysis
- GRB 080520, GROND observations
- GRB 080520: Swift XRT Refined Analysis
- GRB 080520: Swift detection of a burst with optical afterglow
- Konus-Wind observation of GRB 080514B
- GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
- GRB 080517: Swift detection of a burst
- GRB 080516: Swift detection of a burst
- Konus-Wind observation of GRB 080513
- IPN triangulation of bright GRB 080513
- GRB 080514B: KPNO 4m IR observations
- GRB 080514B: slow fading behaviour ?
- GRB 080514B: Swift-XRT analysis
- GRB 080514B: SuperAGILE/IPN GRB Localization
- Konus-Wind observation of GRB 080507
- GRB 080507: E Pur Si Muove!
- GRB 080503: Hubble Space Telescope Imaging
- GRB 080506:Optical observations from HCT
- GRB 080507: GRB localization by SuperAGILE
- GRB 080506, Swift-BAT refined analysis
- GRB 080503, Swift-BAT refined analysis
- GRB 080430
- GRB 080430
- GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
- GRB 080503: Swift detection of a short burst
- GRB 080430 optical observations
- GRB080430: Optical observation in AsU CAS Ondrejov & Brno
- GRB 080430: Bootes observation
- GRB 080430: Swift detection of a burst with optical afterglow
- GRB 080320 : Faulkes Telescope North Observations
- Swift-BAT trigger 309665 is not a GRB
- GRB 080420A: ROTSE-III Optical Limits on a possible short burst
- GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
- GRB 080414: RTT150 optical observations
- GRB 080414: A long GRB detected by INTEGRAL
- GRB 080413B: Swift XRT refined analysis
- GRB 080413B, Swift-BAT refined analysis
- GRB 080413A: Swift-XRT refined analysis
- GRB 080413A Bootes observation
- GRB 080411: Swift-XRT Refined Analysis
- Konus-Wind observation of GRB 080411
- GRB 080411: Swift detection of a bright burst
- GRB 080330 optical observations
- GRB 080408: GRB Localization by SuperAGILE
- GRB 080405: Swift-BAT refined analysis
- GRB 080330, SMARTS optical/IR afterglow observations
- Konus-Wind observation of GRB 080328
- GRB 080319B: Continued Gemini-South followup and possible host galaxy
- GRB 080325, Swift-BAT refined analysis
- GRB 080325: GROND Observations
- GRB080319B: optical observations
- GRB 080325: Early observations from OSN
- GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
- GRB 080319D: optical upper limit
- GRB 080319B - CARMA mm Observations
- GRB 080320: J detection with FLAMINGOS
- GRB 080319D: Swift XRT refined analysis
- Konus-Wind observation of GRB 080319C
- GRB 080319B: Gemini-South photometry
- GRB 080319B: Allen Telescope Array Observations
- Konus-Wind observation of GRB 080319B
- GRB 080319B: WSRT Radio Observations
- GRB 080320: Swift detection of a burst
- GRB 080320: ROTSE-III Optical Limits
- GRB 080319C: Swift detection of a burst with an optical afterglow
- GRB 080319B: Change in power law decay index
- GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
- Swift trigger 306323: Swift-BAT/XRT refined analysis
- GRB080310: Optical observation by MITSuME telescope
- GRB 080310, Swift-BAT refined analysis
- GRB080307: optical upper limit
- GRB080310 : Lulin optical observation
- GRB 080310: RRM optical photometry with the VLT
- GRB 080310, SMARTS optical/IR afterglow observations
- GRB080307, optical upper limit
- GRB080229, optical upper limit
- GRB080307: Optical upper limits
- GRB 080307, Preliminary Swift-BAT refined analysis