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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"

41 results found.

  1. GRB 171205A: Continued ATCA observations
  2. GRB 171205A: ATCA observations of late-time radio emission
  3. e-MERLIN detection of GRB 171205A
  4. VLBA detection of GRB 171205A
  5. GRB 171205A: SMARTS optical/IR supernova monitoring
  6. GMRT Radio detection of GRB 171205A
  7. GRB 171205A: RATAN observations
  8. GRB 171205A: ALMA observations
  9. GRB 171205A: JCMT SCUBA-2 sub-mm observations
  10. Correction to GCN 22184: GRB 171205A: Swift-BAT refined analysis
  11. Konus-Wind observation of GRB 171205A
  12. GRB 171205A: MASTER-Net OT recent photometry
  13. GRB 171205A: iTelescope optical observations
  14. GRB 171205A: Mondy optical observations
  15. GRB 171205A: SAO-RAS optical observations
  16. GMRT upper limit on GRB 171205A
  17. GRB 171205A: VLA detection
  18. GRB 171205A: UKIRT near-IR observations
  19. GRB 171205A: TSHAO optical observations
  20. GRB 171205A: Detection of the emerging SN
  21. GRB 171205A: Continued Swift/UVOT Observations
  22. GRB 171205A: MASTER-SAAO optical observations of unusual OT
  23. GRB 171205A: GROND observations of the optical/NIR transient
  24. GRB 171205A: LCO 1-m telescope observations
  25. GRB 171205A: GMG observations (2nd night)
  26. GRB 171205A: Host galaxy photometric properties
  27. GRB 171205A: CHILESCOPE optical observations
  28. GRB 171205A: SMARTS optical/IR afterglow observations
  29. GRB 171205A: GOTO detection of the optical counterpart
  30. GRB 171205A: TNG NIR detections
  31. GRB 171205A: LSGT optical afterglow follow-up observation
  32. GRB 171205A: NOEMA detection of a bright mm afterglow
  33. GRB 171205A: GMG observation
  34. GRB 171205A: Swift-BAT refined analysis
  35. GRB 171205A: Swift-XRT refined Analysis
  36. GRB 171205A: RATIR Optical and NIR Observations
  37. GRB 171205A: Swift/UVOT Detection
  38. GRB 171205A: VLT/X-shooter optical counterpart and spectroscopic observations
  39. GRB 171205A: Enhanced Swift-XRT position
  40. GRB 171205A: Likely association with low-z spiral galaxy
  41. GRB 171205A: Swift detection of a burst

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