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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"

25960 results found.

  1. GRB 980613: Detection of the probable host galaxy
  2. Reduced error box of SGR 1627-41
  3. GRB 980613: BATSE Observations
  4. GRB 980613 Optical Observations
  5. GRB 980613 optical observations
  6. Discovery of a new SGR source, SGR1627-41
  7. GRB980613 Optical Observations
  8. GRB980613 observations from Palomar
  9. GRB 980613 optical/IR obs.
  10. GRB980613 Near Infra-Red Observations
  11. GRB971214 Secondary Standards
  12. GRB980519 Secondary Standards
  13. BATSE on-board GRB trigger change
  14. GRB 980519 Optical Observations
  15. GRB 980519
  16. GRB980519 optical observations
  17. GRB 980519 Optical Observations
  18. GRB980519 BATSE Observations
  19. GRB980519 Optical Observations
  20. GRB980519 Optical Observations
  21. GRB 980519 Optical Observations
  22. GRB980515, BeppoSAX IAUC to be submitted
  23. BSAX Observations of GRB980425 field
  24. IPN web site of GRBs
  25. GRB980425 BATSE observations
  26. SAX J0840.7+2248 Optical Observations
  27. GRB980425: optical obs.
  28. GRB980425: Radio Observations
  29. report on BSAX observations of GRB980425
  30. GRB 980329 ROSAT observation
  31. GRB980326 X-ray Observations
  32. GRB980326, optical observations
  33. GRB980326, optical observations
  34. GRB980329, Fading IR counterpart to radio source
  35. GRB980329 Keck K-band observations
  36. GRB980329 sub-millimeter observations
  37. GRB980329 optical observations
  38. GRB980329 near-IR observations
  39. GRB980329 near-IR observations
  40. GRB980326 optical observations
  41. GRB980329 optical observations
  42. GRB980329 VLA observations
  43. GRB980329 optical observations
  44. GRB980329 optical observations
  45. GRB980326 optical observations
  46. GRB980326 optical observations
  47. Optical Observations of GRB 970508
  48. Near-IR follow-up on GRB 971227
  49. Optical Observations of the GRB 971227 field
  50. Optical Observations on GRB 971227
  51. GRB971227: Plaskett R-band observations
  52. GRB 971227: Optical clarifications
  53. GRB971227: Further CAHA R-band images
  54. GRB971227: LOTIS observations
  55. GRB971214: Optical Observations and Calibrations
  56. GRB 971214: Optical Observations
  57. Radio Observations of GRB 971214 at the VLA
  58. GRB 971024: Refined analysis by USNOFS Observations
  59. GRB 971024: KPNO Optical Observations
  60. GRB 970828: Palomar Observations

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