Skip to main content
New! October 18 GCN Classic Outage and Schema v4.2.0. 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').

10 results found.

  1. GRB 201001A: Swift/UVOT Upper Limits
  2. GRB 201001A: TSHAO optical upper limit
  3. GRB 201001A: Xinglong-2.16m optical upper limit
  4. GRB 201001A: MITSuME Akeno optical upper limits
  5. GRB 201001A: Swift-BAT refined analysis
  6. GRB 201001A: Swift-XRT refined Analysis
  7. GRB 201001A: Fermi GBM observation
  8. GRB 201001A: Enhanced Swift-XRT position
  9. GRB 201001A: Swift detection of a burst
  10. GRB 201001A: Fermi GBM Final Real-time Localization

Advanced

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