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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').

14273 results found.

  1. Optical Observations of GRB 981220
  2. GRB 981226: radio variable
  3. GRB 981226 Optical Observations
  4. GRB981226 BeppoSAX follow up
  5. GRB 981226
  6. GRB 981226 optical observations
  7. GRB 981220:Optical Observations
  8. GRB981226, BeppoSAX Christmas GRB
  9. GRB 981226 optical observations
  10. GRB 981220, radio observations
  11. GRB 981220
  12. GRB 980326/Host Galaxy
  13. BeppoSAX NFI Observation of GRB980425
  14. GRB980329 R,I flux calibration and R,I,K upper limits
  15. GRB980425 Optical Follow-up
  16. GRB970508 optical observations
  17. GRB980519, Optical Observations
  18. GRB980703 optical photometry
  19. GRB980703 optical observations
  20. GRB980703 Transient Optical Follow-Up
  21. GRB980703: LOTIS observation at early times
  22. BeppoSAX NFI observations of GRB 980703
  23. GRB 980703: ASM Position & Intensity
  24. GRB980703 optical followup
  25. Radio observations of SGRs
  26. SGR1900+14 field optical observations
  27. GRB 980613: Optical transient and its host galaxy
  28. GRB 980613: Detection of the probable host galaxy
  29. GRB 980613 Optical Observations
  30. GRB 980613 optical observations
  31. Discovery of a new SGR source, SGR1627-41
  32. GRB980613 Optical Observations
  33. GRB980613 observations from Palomar
  34. GRB980613 BeppoSAX-NFI follow up
  35. GRB980613 Near Infra-Red Observations
  36. GRB971214 Secondary Standards
  37. GRB980519 Secondary Standards
  38. GRB 980519 Optical Observations
  39. GRB 980519
  40. GRB980519 optical observations
  41. GRB 980519 Optical Observations
  42. GRB970519, optical follow-up at Schmidt Calern
  43. GRB980519 Optical Observations
  44. GRB 980519 Optical Observations
  45. GRB980515, BeppoSAX IAUC to be submitted
  46. BSAX Observations of GRB980425 field
  47. SAX J0840.7+2248 Optical Observations
  48. GRB980425: optical obs.
  49. GRB980425: Radio Observations
  50. report on BSAX observations of GRB980425
  51. GRB 980329 ROSAT observation
  52. GRB980326 X-ray Observations
  53. GRB980326, optical observations
  54. GRB980326, optical observations
  55. GRB980329 Keck K-band observations
  56. GRB980326 optical observations
  57. GRB980329 optical observations
  58. GRB980329 VLA observations
  59. GRB980329 optical observations
  60. GRB980326 optical observations
  61. Untitled
  62. Untitled
  63. Untitled
  64. Untitled
  65. Untitled
  66. Untitled
  67. Untitled
  68. Untitled
  69. Untitled
  70. GRB 971214: Optical Observations
  71. Radio Observations of GRB 971214 at the VLA
  72. GRB 971024: KPNO Optical Observations
  73. GRB 970828: Palomar Observations

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