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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"21 results found.
- GRB 141026A: CrAO optical observation
- GRB 141026A: Gemini-North optical and NIR imaging
- GRB 141026A: VLA observations
- GRB 141026A: IRAM 30m millimetre observations
- GRB 141026A: Continued RATIR Optical and NIR Observations
- GRB 141026A: GTC spectroscopy
- GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
- GRB 141026A: SAO RAS Zeiss-1000 observations
- GRB 141026A: Continued RATIR Optical and NIR Observations
- GRB 141026A: Swift/UVOT Upper Limits
- GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
- GRB 141026A: Swift-XRT refined Analysis
- GRB 141026A: Swift-BAT refined analysis
- GRB 141026A: MASTER early optical observations
- GRB 141026A: Enhanced Swift-XRT position
- GRB141026A: Deep P200 optical imaging
- GRB 141026A: 1.23m CAHA I-band observations
- GRB 141026A: GROND observations
- GRB 141026A: RATIR Optical Observations
- GRB 141026A: P60 early observations
- GRB 141026A: Swift detection of a burst