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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"

10761 results found.

  1. GRB 990506, optical observations
  2. GRB990506 Optical observations
  3. New IPN/RXTE error box for GRB990506
  4. GRB 970228: Redshift and properties of the host galaxy
  5. GRB980425 Optical observations of exponential decline at late time
  6. GRB990323 PRECISE IPN POSITION
  7. GRB990321 IPN TRIANGULATION
  8. GRB990308 not a new SGR
  9. GRB990308, Possible new SGR~0209+70
  10. GRB 981220, radio observations
  11. BATSE Flight Anomaly
  12. Optical Observations of GRB990217
  13. GRB 990123: Continued Radio Observations
  14. Search for Potential Images of GRB 990123
  15. "GRB 990123: New BV Observations"
  16. GRB 990123: BATSE Observations
  17. GRB990123 Optical Observation
  18. GRB990123, BeppoSAX-NFI X-ray afterglow detection
  19. GRB 980613: Spectroscopy of the host galaxy
  20. GRB 981226 optical observations
  21. GRB981226, BeppoSAX-NFI follow-up
  22. GRB 981220: BeppoSAX/GRBM results
  23. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  24. GRB 980923 BATSE Observations
  25. SGR1900+14, BeppoSAX-GRBM observations
  26. GRB980703 optical photometry
  27. GRB 980703: BATSE Observations
  28. GRB980703: LOTIS observation at early times
  29. GRB980519 observation report
  30. GRB980703 optical followup
  31. SGR1627-41
  32. Radio observations of SGRs
  33. SGR1627-41, RXTE/ASM observations
  34. Reduced error box of SGR 1627-41
  35. GRB 980613: BATSE Observations
  36. SGR 1627-41
  37. Discovery of a new SGR source, SGR1627-41
  38. SGR 1900+14
  39. SGR1900+14
  40. SGR1900+14
  41. BATSE on-board GRB trigger change
  42. GRB 980519 Optical Observations
  43. GRB980519 BATSE Observations
  44. GRB970519, optical follow-up at Schmidt Calern
  45. GRB980519 optical observations
  46. GRB 980519 Optical Observations
  47. GRB980519, BeppoSAX-WFC updated position
  48. GRB980519, BeppoSAX-WFC position
  49. GRB 980425 Radio Light Curve
  50. GRB980425 BATSE observations
  51. GRB 980329 ROSAT observation
  52. GRB980329 optical observations
  53. GRB980329 optical observations
  54. GRB980329 optical observations
  55. GRB 971227: Optical Observations
  56. GRB971227: LOTIS observations
  57. GRB 971214: EUVE Observations
  58. GRB 971024: USNO Observations
  59. IRAS 18119-1342 and the possible new SGR
  60. Possible new SGR from US Naval Observatory
  61. RXTE Observations of SGR 1814-13

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