Skip to main content
New Swift-BAT/GUANO and IceCube Notice Types Available! See news and announcements

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').

13 results found.

  1. GRB 110128A: Fermi GBM detection
  2. GRB110128A: MITSuME Okayama optical upper limits
  3. GRB110128A: TNG NIR observations
  4. GRB 110128A, Swift-BAT refined analysis
  5. GRB 110128A: TAROT-Calern refined analysis
  6. GRB 110128A: Swift/UVOT observations
  7. GRB 110128A: Swift-XRT refined Analysis
  8. GRB 110128A: WHT redshifts of nearby field galaxies
  9. GRB 110128A: VLT/X-shooter redshift
  10. GRB 110128A: Enhanced Swift-XRT position
  11. GRB 110128A: Afterglow detection from NOT
  12. GRB 110128A: TAROT Calern observatory upper limits
  13. GRB 110128A: Swift detection of a burst


Download all Circulars as a .tar.gz archive:
Looking for U.S. government information and services? Visit