Skip to main content
Circulars over Kafka event name backfill. 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').
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"

34 results found.

  1. GRB 130606A: Chandra observation
  2. GRB 130606A: CrAO optical upper limit
  3. GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
  4. GRB 130606A: Continued Skynet/PROMPT observations
  5. GRB 130606A: Continued RATIR Optical and NIR Monitoring
  6. GRB 130606A, Swift-BAT refined analysis
  7. GRB 130606A: TAROT Calern observatory early optical observations
  8. GRB 130606A: EVLA detection
  9. GRB 130606A: VLT/X-shooter redshift confirmation
  10. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  11. GRB 130606A: Swift/UVOT Upper Limits
  12. GRB 130606A: Swift-XRT refined Analysis
  13. GRB 130606A: Enhanced Swift-XRT position
  14. Konus-Wind observation of GRB 130606A
  15. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  16. GRB 130606A: AAO optical observations
  17. GRB 130606A: P60 Observations
  18. GRB 130606A: PAIRITEL NIR Afterglow Observations
  19. GRB 130606A: LOAO IZY Observation
  20. GRB 130606A: RATIR r'-band Dropout
  21. GRB 130606A: MMT Spectroscopy
  22. GRB 130606A:T100 observations
  23. GRB 130606A: 10.4m GTC refined redshift z = 5.91
  24. GRB 130606A: Errata Ks magnutide in GCN 14792
  25. GRB 130606A: Errata of J and Ks magnitudes in GCN 14784
  26. GRB 130606A: Errata of J and Ks magnitudes in GCN 14784
  27. GRB130606A: Montarrenti Observatory afterglow detection
  28. GRB 130606A: 10.4m GTC spectroscopy indicates z = 6.1
  29. Virtual Telescope observations of GRB 130606A
  30. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  31. GRB 130606A: IRSF NIR Observation
  32. GRB 130606A: NOT afterglow detection
  33. GRB 130606A: optical afterglow with BOOTES-2/TELMA and 1.23m CAHA
  34. GRB 130606A: Swift detection of a burst

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov