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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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

32 results found.

  1. GRB 150910A: CrAO optical observations
  2. GRB 150910A: AAO optical observations
  3. GRB 150910A: Mt. Terskol observatory optical observations
  4. GRB 150910A: TSHAO optical observations
  5. GRB 150910A: T100 observations
  6. GRB 150910A: Continued RATIR Observations
  7. GRB 150910A: Mt. Terskol observatory optical observation
  8. GRB 150910A: RATIR Observations
  9. GRB 150910A: MITSuME Ishigakijima Optical Observation after 2 days
  10. GRB150910A: P60 Observations
  11. GRB 150910A: AAO optical observations
  12. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  13. GRB 150910A: Chuguev observatory optical observations
  14. GRB 150910A: VLA Detection
  15. GRB 150910A: continued SAO RAS optical observations
  16. GRB 150910A: TSHAO optical observations
  17. GRB 150910A: NOT observations of the afterglow
  18. GRB 150910A: MITSuME Okayama Ks-band Observation
  19. GRB 150910A: GROND observation of the afterglow
  20. GRB 150910A: MITSuME Ishigakijima Optical Observation
  21. GRB 150910A: SAO RAS optical photometry
  22. GRB 150910A: Redshift from 10.4m GTC+OSIRIS
  23. GRB 150910A: Kast spectroscopy from 3m Shane telescope
  24. GRB 150910A: Swift-XRT refined Analysis
  25. GRB 150910A: Enhanced Swift-XRT position
  26. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  27. GRB 150910A: Nanshan optical observations
  28. GRB 150910A: Swift-BAT refined analysis
  29. GRB 150910A: MITSuME Okayama Optical Observation
  30. GRB 150910A: LCOGT FTN afterglow observations
  31. GRB 150910A: KAIT Optical Afterglow Detection
  32. GRB 150910A: Swift detection of a burst with an optical afterglow

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