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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"

24656 results found.

  1. GRB 980613 optical observations
  2. Discovery of a new SGR source, SGR1627-41
  3. GRB980613 Optical Observations
  4. GRB980613 observations from Palomar
  5. GRB 980613 optical/IR obs.
  6. GRB980613 Near Infra-Red Observations
  7. GRB971214 Secondary Standards
  8. GRB980519 Secondary Standards
  9. BATSE on-board GRB trigger change
  10. GRB 980519 Optical Observations
  11. GRB 980519
  12. GRB980519 optical observations
  13. GRB 980519 Optical Observations
  14. GRB980519 BATSE Observations
  15. GRB980519 Optical Observations
  16. GRB980519 Optical Observations
  17. GRB 980519 Optical Observations
  18. GRB980515, BeppoSAX IAUC to be submitted
  19. BSAX Observations of GRB980425 field
  20. IPN web site of GRBs
  21. GRB980425 BATSE observations
  22. SAX J0840.7+2248 Optical Observations
  23. GRB980425: optical obs.
  24. GRB980425: Radio Observations
  25. report on BSAX observations of GRB980425
  26. GRB 980329 ROSAT observation
  27. GRB980326 X-ray Observations
  28. GRB980326, optical observations
  29. GRB980326, optical observations
  30. GRB980329, Fading IR counterpart to radio source
  31. GRB980329 Keck K-band observations
  32. GRB980329 sub-millimeter observations
  33. GRB980329 optical observations
  34. GRB980329 near-IR observations
  35. GRB980329 near-IR observations
  36. GRB980326 optical observations
  37. GRB980329 optical observations
  38. GRB980329 VLA observations
  39. GRB980329 optical observations
  40. GRB980329 optical observations
  41. GRB980326 optical observations
  42. GRB980326 optical observations
  43. Optical Observations of GRB 970508
  44. Near-IR follow-up on GRB 971227
  45. Optical Observations of the GRB 971227 field
  46. Optical Observations on GRB 971227
  47. GRB971227: Plaskett R-band observations
  48. GRB 971227: Optical clarifications
  49. GRB971227: Further CAHA R-band images
  50. GRB971227: LOTIS observations
  51. GRB971214: Optical Observations and Calibrations
  52. GRB 971214: Optical Observations
  53. Radio Observations of GRB 971214 at the VLA
  54. GRB 971024: Refined analysis by USNOFS Observations
  55. GRB 971024: KPNO Optical Observations
  56. GRB 970828: Palomar Observations

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