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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"

25562 results found.

  1. GRB980519 optical observations
  2. GRB980519 BATSE Observations
  3. GRB970519, optical follow-up at Schmidt Calern
  4. GRB980519 optical observations
  5. GRB980519 Optical Observations
  6. GRB980519 Optical Observations
  7. GRB980519 IPN POSITION
  8. GRB980519 Optical Observations
  9. GRB 980519 Optical Observations
  10. GRB980519 optical observations
  11. GRB980515, BeppoSAX IAUC to be submitted
  12. GRB980519, BeppoSAX-WFC updated position
  13. GRB980519, BeppoSAX-WFC position
  14. BeppoSAX GRB ALERT: updated position of grb980515
  15. GRB 980425 Radio Light Curve
  16. GRB980425 BATSE observations
  17. GRB980425: optical obs.
  18. GRB980425: Radio Observations
  19. GRB 980425 optical observations
  20. report on BSAX observations of GRB980425
  21. GRB 980425 optical observations
  22. GRB980326, optical observations
  23. GRB980326, optical observations
  24. GRB980329, Fading IR counterpart to radio source
  25. GRB980326 IPN annulus
  26. GRB980329 Keck K-band observations
  27. GRB980329 sub-millimeter observations
  28. GRB980329 IPN annulus
  29. GRB980329 optical observations
  30. GRB980329 near-IR observations
  31. GRB980329 near-IR observations
  32. GRB980329 infrared observations
  33. GRB980329 optical observations
  34. GRB980326 optical observations
  35. GRB980329 optical observations
  36. GRB980329 optical observations
  37. GRB980329 optical observations
  38. GRB980326 optical observations
  39. GRB970508 SAO RAS optical observations
  40. Optical Observations of GRB 970508
  41. GRB 971214: Redshift from Keck Observations
  42. Near-IR follow-up on GRB 971227
  43. GRB971214: Keck R & I-band Observations
  44. GRB 971227: Optical Observations
  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. GRB 971227: CAHA R-band images
  52. GRB971214: Optical Observations and Calibrations
  53. GRB 971214: Apache Point Observatory Optical Observations
  54. GRB 971214: KPNO Optical Observations
  55. Optical Observations of GRB 971214 at Keck
  56. GRB 971214: Optical Observations
  57. Radio Observations of GRB 971214 at the VLA
  58. GRB 971024: Refined analysis by USNOFS Observations
  59. GRB 970925: BATSE Localization
  60. IRAS 18119-1342 and the possible new SGR
  61. RXTE Observations of SGR 1814-13
  62. GRB 970828: Palomar Observations

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