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"22914 results found.
- Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
- GRB 101225A (Swift trigger 441015): optical upper limit
- Trigger 441015: Swift detection of a possible burst or transient
- GRB 101224A: NOT optical observation
- GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
- GRB 101224A: Swift/UVOT Upper Limits
- GRB 101224A: Swift-XRT refined Analysis
- GRB101224A: MITSuME Okayama optical upper limits
- GRB 101224A - UVOT-enhanced XRT position
- GRB 101224A: Swift detection of a short burst
- GRB 101219A: Chandra Observations
- GRB 101219B: Swift/UVOT refined analysis
- GRB 101219B: Enhanced Swift-XRT position
- GRB 101219A: MITSuME Ishigakijima Optical upper limits
- GRB 101219B: GROND Detection of the Optical/NIR Afterglow
- GRB 101219A: IAC80 optical observations
- GRB 101219B: Swift detection of a burst with an optical afterglow
- GRB 101219A: Swift/UVOT Upper Limits
- GRB 101219A: GROND Upper limits
- GRB 101219A: Magellan NIR observations
- GRB 101219A: Further Gemini-South Imaging
- GRB 101219A - NOT observation - upper limit
- GRB 101219A: SARA-N Upper Limit
- GRB 101219A: REM optical and NIR observations
- GRB 101219A: ROTSE-III Optical Limits
- GRB 101219A: Swift detection of a short hard burst
- GRB 101213A : Suzaku WAM observation of the prompt emission
- Redshift solution(s) for GRB101213A from Swift-XRT data
- XRF 101117A, RIMOTS optical upper limits
- GRB 101213A: Swift/UVOT Upper Limits
- GRB 101213A: Enhanced Swift-XRT position
- GRB 101213: object within the X-ray error circle
- GRB 101213A: Swift detection of a burst
- GRB101204A: Swift/UVOT observations
- GRB 101204A: Swift-XRT refined Analysis
- GRB101204A GROND Detection of the Optical/NIR Afterglow
- GRB 101204A Afterglow Candidate, VATT Observations
- GRB 101204A Swift-XRT/UVOT afterglow candidate
- IPN Localization of GRB101130 (possible short duration burst)
- GRB 101129A SHB found by IPN and in ground analysis of BAT data
- GRB 101201A: Fermi GBM observation
- GRB 101201A: Swift-XRT refined Analysis
- GRB 101201A: Swift/UVOT Detection
- GRB 101201A: GROND Detection of the Optical/NIR Afterglow
- GRB 101201A detected in ground analysis of BAT data
- Swift detection of MAXIJ1409-619
- GRB 101123A: MASTER prompt optical observations
- IPN triangulation of bright GRB 101123A
- GRB 101123A: Fermi GBM detection
- GRB 101117B: GROND Upper limits
- GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
- XRF 101117A: Palomar Transient Factory Observations
- GRB 101117B: Swift-XRT refined analysis
- GRB101114A: Swift/UVOT Upper Limits
- GRB 101114A: Confirmation of the X-ray afterglow
- GRB 101117B: Enhanced Swift-XRT position
- GRB 101117B: Swift detection of a burst
- GRB 101114A: GROND Upper limits
- Konus-Wind observation of GRB 101114A
- Fermi GBM detection of a burst from a galactic source
- GRB 101114A: Swift-XRT candidate afterglow detection and analysis
- Possible detection of INTEGRAL burst GRB 101112A by the EVLA
- GRB 101112A: optical observations
- GRB 101112A - XRT source detection/analysis
- GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
- GRB 101030A : MOA optical observation
- GRB 101030A: GROND optical/NIR afterglow candidate
- GRB 101030A : Swift XRT refined analysis
- GRB 101030A: Swift/UVOT Upper Limits
- GRB 101030A: Enhanced Swift-XRT position
- GRB 101030A: Swift detection of a burst
- GRB 090111, the review of the sky area in plate archives (1976-1996)
- GRB 101024A: GROND optical/NIR observations
- GRB 101024A: Swift XRT refined analysis
- GRB 101024A: Zadko observatory - Gingin. Optical observations
- GRB101024A: Swift/UVOT
- GRB 101024A: Swift-BAT refined analysis
- GRB 101024A: Enhanced Swift-XRT position
- Swift/UVOT observations of GRB101023A
- GRB 101024A: Swift detection of a burst with an optical afterglow
- GGRB 101023A: GROND detection of the optical-NIR afterglow
- GRB 101023A: Swift-BAT refined analysis
- GRB 101023A: Gemini discovery of optical afterglow
- GRB 101023A: Enhanced Swift-XRT position
- GRB 101023A: REM NIR observations
- GRB 101023A: Swift detection of a burst
- GRB 101020A: BOOTES2 follow-up and limit
- GRB 101020A, Swift-BAT refined analysis
- GRB 101020A: Swift detection of a burst
- GRB 101017A: Swift XRT refined analysis
- GRB 101017A: Swift/UVOT Observations
- GRB 101008A: correction to the GCN 11352
- GRB 101008A: optical observations
- GRB101017A: MITSuME Okayama optical upper limits
- GRB 101014A: Fermi LAT detection
- GRB 101017A: Enhanced Swift-XRT position
- GRB 101017A: ROTSE-III Optical Limits
- GRB 101017A: Swift detection of a burst with optical counterpart
- GRB 101011A: BOOTES-3 Upper Limit
- GRB 101014A: Fermi GBM detection