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"820 results found.
- Short X-ray Transient detected by MAXI/GSC
- Short X-ray Transient, RIMOTS optical upper limits
- Short X-ray Transient Detection by MAXI/GSC
- IPN Triangulation of GRB091120
- Konus-Wind observation of GRB 091120
- GRB 091120: MAXI GSC detection
- GRB 090926B: MAXI GSC detection
- GRB 090831A: Suzaku WAM observation of the prompt emission
- GRB 090831A: IPN Triangulation
- GRB 090831: MAXI GSC detection
- GRB 090807: Swift/UVOT Upper Limits
- GRB 080903: Swift/UVOT Observations
- Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
- Correction to the Swift-BAT Transient Identification (trigger=296683)
- GRB070508: Swift/UVOT Observations
- GRB 051227: Swift/UVOT Upper Limits (Possible U-band
- GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
- GRB 000301C: HST/STIS CCD Imaging of the field
- GRB000301C, Radio observations
- GRB000301C, Radio observations