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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"

33 results found.

  1. GRB 170714A: NOEMA non-detection of the Bastille Day Burst
  2. GRB 170714A: Bastille Day Burst: ULGRB or RTDE?
  3. GRB 130925A: continuing Swift/XRT monitoring
  4. GRB 111209A: Swift UVOT refined analysis
  5. GRB 111209A: Swift Burst of Interest
  6. GRB 101225A: revised analysis of narrow band imaging
  7. GRB101225A: early EVLA Observations of Christmas Burst
  8. GRB 101225A, the review of the sky area in plate archives
  9. GRB 101225A is likely at z~0
  10. GRB 101225A: CQUEAN optical observation
  11. GRB101225A - timing analysis
  12. The Christmas burst GRB 101225A - optical spectroscopy with GTC
  13. GRB 101225A: HST observations - no host detected
  14. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  15. GRB 101225a
  16. GRB 101225A: Keck redshift
  17. GRB 101225A: Host galaxy
  18. GRB 101225A: optical break from NOT observation
  19. GRB 101225A: MMT spectroscopy
  20. GRB 101225A: P60 Observations
  21. GRB 101225A: MAXI/GSC observations
  22. GRB 101225A Late-time emission observed by Swift-BAT
  23. GRB 101225: Optical follow-up of the Christmas burst
  24. GRB 101225A: WHT observations
  25. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  26. GRB 101225A, Swift-BAT refined analysis
  27. GRB 101225A: Swift/UVOT Detection
  28. GRB 101225A: Swift-XRT refined Analysis
  29. GRB 101225A: Enhanced Swift-XRT position
  30. Trigger 441015 / GRB 101225A: Further NOT optical observation
  31. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  32. GRB 101225A (Swift trigger 441015): optical upper limit
  33. Trigger 441015: Swift detection of a possible burst or transient

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