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"27032 results found.
- GRB 080607: ROTSE-III Detection of Optical Counterpart
- GRB 080605: Swift-UVOT refined analysis
- GRB 080605, Swift-BAT refined analysis
- GRB 080605, Swift-BAT refined analysis
- GRB 080605: Swift-XRT refined analysis
- GRB080605: observation by BOOTES
- GRB 080605: MASTER VWF 46 s AT observation
- GRB 080605: GROND detection of the optical afterglow candidate
- GRB 080605: Liverpool Telescope optical afterglow candidate
- GRB 080605: Swift/UVOT Position of the Optical Afterglow
- GRB 080605: Swift detection of a burst with an optical afterglow
- GRB 080603B: PAIRITEL infrared detection
- GRB 080603A: PAIRITEL infrared detection
- Swift/UVOT observations of GRB080604
- GRB 080604, Swift-BAT refined analysis
- GRB 080604: Swift-XRT refined analysis
- GRB 080603B : Liverpool Telescope Observations
- Konus-Wind observation of GRB 080603B
- GRB 080603B: Swift-XRT refined analysis
- GRB 080603A: Swift-XRT detection of the afterglow
- GRB 080603B: Swift/UVOT detection of the afterglow
- 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 080603B: TAROT Calern observatory confirmation of slow optical decay
- GRB 080516: TAROT La Silla observatory optical observations
- GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
- GRB 080603B: Swift detection of a burst with optical afterglow
- GRB 080603B: ROTSE-III Detection of Optical Counterpart
- GRB 080603: Gemini-North redshift
- Possible GRB080603: Faulkes Telescope North optical afterglow candidate
- SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
- GRB 080602, Swift-BAT refined analysis
- GRB 080602: Swift-XRT refined analysis
- Konus-Wind observation of GRB 080602
- GRB 080602: NOT R-band upper limit
- GRB 080602: Swift detection of a burst
- Swift analysis of BAT Slew Survey event (Trigger=009)
- Konus-Wind observation of reactivation of SGR 1627-41
- GRB 080523, Swift-BAT refined analysis
- Swift/UVOT observations of GRB 080523
- GRB 080523: Swift detection of a burst
- GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
- GRB 80516: Swift/UVOT Observations
- GRB 080515: Swift-XRT position and analysis
- GRB 080520, Swift-BAT refined analysis
- GRB080520: Swift/UVOT observations
- GRB 080520: Swift XRT Refined Analysis
- GRB 080520: Swift detection of a burst with optical afterglow
- GRB 080514B: Suzaku WAM observation of the prompt emission
- GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
- GRB 080503: Further HST imaging
- GRB 080517, Swift-BAT refined analysis
- GRB 080517: Swift-XRT refined analysis
- GRB 080514B: Further NIR observations
- GRB080517: Liverpool Telescope Optical Observations
- GRB 080517: Swift detection of a burst
- GRB 080516: Swift-XRT Team refined analysis
- GRB 080516, Swift-BAT refined analysis
- GRB 080514B: NOT observations
- GRB 080516: Swift detection of a burst
- Swift-BAT refined analysis for Trigger 311603: Galactic source
- GRB 080515, Swift-BAT refined analysis
- GRB 080514B: KPNO 4m IR observations
- GRB 080514B: Swift-XRT analysis
- GRB 080515: Swift detection of a burst
- Swift detection of a possible galactic transient
- GRB 080506: NAYUTA Optical Observation
- GRB 080507: Suzaku WAM observation of the prompt emission
- GRB 080507: Keck photometry
- GRB 080507: E Pur Si Muove!
- GRB080507: Swift/UVOT followup observations
- GRB 080503: Fading in continued Gemini imaging
- GRB 080506: Swift XRT refined analysis
- GRB080506: Swift/UVOT observations
- GRB 080506, Swift-BAT refined analysis
- GRB080503, RIMOTS optical upper limit
- GRB 080506: TLS afterglow detection in VRIZ
- GRB 080506: Optical observation with KANATA/TRISPEC
- GRB 080506: Swift detection of a burst with optical afterglow
- GRB 080503: Late-time Optical rebrightening (possible mini-SN)
- GRB 080503, Swift-BAT lag and time-resolved spectral analysis
- GRB 080503: MITSuME Ishigakijima optical upper limits
- GRB080503: Swift/UVOT Upper Limits
- GRB080503 XRT refined analysis
- GRB 080503, Swift-BAT refined analysis
- GRB 080503: MITSuME Akeno optical upper limits
- GRB 080503: Swift detection of a short burst
- GRB 080411: Continued Swift Monitoring
- GRB080430: Swift/UVOT observations
- GRB 080430, Swift-BAT refined analysis
- GRB 080430: Swift-XRT refined analysis
- GRB 080430 - SDSS Pre-Burst Observations
- GRB 080430: Swift detection of a burst with optical afterglow
- GRB 080430: TAROT Calern observatory optical observations
- GRB960202B - on the association with SN 1996cr
- GRB 080426: Swift-XRT refined analysis