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"8477 results found.
- GRB 080603 OA candidate
- Possible GRB080603: Faulkes Telescope North optical afterglow candidate
- GRB 080602: Swift detection of a burst
- Konus-Wind observation of reactivation of SGR 1627-41
- GRB 080523, Swift-BAT refined analysis
- GRB 080523: Swift detection of a burst
- GRB 080520, GROND observations
- GRB 080520: Swift detection of a burst with optical afterglow
- GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
- GRB 080517, Swift-BAT refined analysis
- GRB 080516: Swift detection of a burst
- GRB 080514B : redshift estimation
- GRB 080514B, GROND observations
- GRB 080514B: Finding chart
- GRB 080514B: Afterglow candidate
- Swift detection of a possible galactic transient
- GRB 080507: E Pur Si Muove!
- GRB080507: Swift/UVOT followup observations
- GRB 080506: Swift detection of a burst with optical afterglow
- GRB 080503: MITSuME Ishigakijima optical upper limits
- GRB 080503: MITSuME Akeno optical upper limits
- GRB 080503: New candidate afterglow/host in Gemini imaging
- GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
- GRB 080503: Swift detection of a short burst
- GRB 080430: Swift detection of a burst with optical afterglow
- GRB 080426: Swift detection of a possibly short burst
- GRB 080420?: Swift detection of a possible short burst
- GRB 080413B: Swift XRT refined analysis
- GRB 080413B, Swift-BAT refined analysis
- GRB 080413B: Swift detection of a possibly short burst with optical counterpart
- GRB 080413A: REM detection of the NIR Afterglow
- GRB 080413: TAROT Calern observatory optical observations
- GRB 080413: Swift detection of a burst with an optical afterglow
- GRB 080413: ROTSE-III Detection of Optical Counterpart
- GRB 080411: GROND detection of optical afterglow candidate
- GRB 080408: GROND detection of optical/NIR afterglow candidate
- GRB 080409: Swift detection of a burst
- GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
- GRB 080330: Liverpool Telescope Optical observations
- GRB 080330: Swift detection of a burst with an optical counterpart
- GRB 080330: TAROT Calern observatory optical detection
- GRB 080319B: Continued Gemini-South followup and possible host galaxy
- GRB 080325, Swift-BAT refined analysis
- GRB080325 - I and z-band Imaging
- GRB 080328: Swift detection of a burst with an optical counterpart
- GRB 080325: Subaru detection of NIR afterglow candidate
- GRB 080325: MITSuME Akeno optical upper limits
- GRB 080325: GROND Observations
- GRB 080325: Swift/UVOT Upper Limits
- GRB 080325: NIR afterglow candidate
- GRB 080325: Swift detection of a burst
- GRB 080319B: Second & Third Epoch WSRT Radio Observations
- GRB 080319D: optical upper limit
- GRB 080320: Early Super-LOTIS Observations
- GRB 080319C, Swift-BAT refined analysis
- GRB 080319B: WSRT Radio Observations
- GRB 080320: Swift detection of a burst
- GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
- GRB 080319D: Swift detection of a burst with a possible optical afterglow
- GRB 080319A, Swift-BAT refined analysis
- GRB 080319C: Swift detection of a burst with an optical afterglow
- GRB 080319C: KAIT OA candidate
- GRB080319B Liverpool Telescope optical afterglow candidate
- GRB 080319B: Super-LOTIS Detection of a Bright OT
- GRB080319A: P60 Optical Afterglow Observations
- GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
- GRB 080319A: Swift detection of a burst
- Swift/UVOT observations of GRB 080315
- GRB 080315: Swift detection of a possible burst
- GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
- GRB 080307: NIR upper limit
- GRB 080310 afterglow candidate (correction to UT time)
- GRB 080310: Swift detection of a burst with optical afterglow
- GRB 080310 afterglow candidate
- GRB 080307, Swift-BAT refined analysis
- GRB 080307: TNT optical observation
- GRB 080307: Gemini-N i-band observations - candidate afterglow
- GRB 080307: retraction of UVOT candidate
- GRB 080307, Preliminary Swift-BAT refined analysis
- GRB 080307: Optical observation with DMC/KANATA
- GRB 080303, Swift-BAT refined analysis
- GRB 080303A: Faulkes Telescope South optical afterglow observations
- GRB 080303: Swift detection of a burst with optical afterglow
- GRB 080303: REM NIR afterglow candidate
- GRB 080229: VLT NIR observations
- GRB 080229: TNG NIR observations
- GRB 080229: REM NIR observations
- GRB 080229: Faulkes Telescope South optical limit
- GRB 080229: Swift detection of a bright burst
- GRB 080218B: REM NIR early upper limits
- GRB 080218B: Swift detection of a burst
- GRB080212: Optical afterglow candidate observed by MITSuME Telescope
- GRB 080212: Swift detection of a burst
- GRB 080207: VLT NIR early upper limits
- GRB 080210: VLT redshift
- GRB 080210: Swift detection of a burst with optical afterglow
- GRB 080210: TAROT La Silla observatory optical detection
- GRB080207: RTT150 Optical Observations
- GRB 080207: REM NIR observations
- GRB 080207: Swift detection of a burst