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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').
  1. SAX J0840.7+2248 Optical Observations
  2. GRB 980425 optical observations
  3. GRB980425: optical obs.
  4. GRB980425: Radio Observations
  5. GRB 980425 optical observations
  6. report on BSAX observations of GRB980425
  7. GRB 980425 optical observations
  8. GRB 980329 ROSAT observation
  9. GRB980326 X-ray Observations
  10. GRB980326, optical observations
  11. GRB980326, optical observations
  12. GRB980329, Fading IR counterpart to radio source
  13. GRByymmdd, Announcement of automation
  14. GRB980326 IPN annulus
  15. GRB980329
  16. GRB980329 Keck K-band observations
  17. GRB980329 sub-millimeter observations
  18. GRB980329 IPN annulus
  19. GRB980329 optical observations
  20. GRB980329 near-IR observations
  21. GRB980329 near-IR observations
  22. GRB980329 optical observations
  23. GRB980329 infrared observations
  24. GRB980329 optical observations
  25. GRB980326 optical observations
  26. GRB980329 optical observations
  27. GRB980329 VLA observations
  28. GRB980329 near IR observations
  29. GRB980329 optical observations
  30. GRB980329 optical observations
  31. GRB980329 optical observations
  32. GRB980326 optical observations
  33. GRB980326 optical observations
  34. GRB980326 optical observations
  35. GRB980326 optical observations
  36. GRB970508 SAO RAS optical observations
  37. Optical Observations of GRB 970508
  38. GRB 971214: Redshift from Keck Observations
  39. Near-IR follow-up on GRB 971227
  40. GRB971214: Keck R & I-band Observations
  41. GRB 971227: Optical Observations
  42. Optical Observations of the GRB 971227 field
  43. Optical Observations on GRB 971227
  44. GRB971227: Plaskett R-band observations
  45. GRB 971227: Optical clarifications
  46. Optical Observations for GRB 971227
  47. GRB971227: Further CAHA R-band images
  48. GRB971227: LOTIS observations
  49. GRB 971227: CAHA R-band images
  50. GRB 971227: Optical observations
  51. GRB971214: Optical Observations and Calibrations
  52. Sub-millimeter Observations of GRB 971214 at the JCMT
  53. GRB 971214: EUVE Observations
  54. GRB 971214: Redshift from Keck Optical Observations
  55. GRB 971214: Redshift from Keck Optical Observations
  56. GRB 971214: Apache Point Observatory Optical Observations
  57. GRB 971214: KPNO Optical Observations
  58. Optical Observations of GRB 971214 at Keck
  59. GRB 971214: Optical Observations
  60. Radio Observations of GRB 971214 at the VLA
  61. GRB 971214: USNOFS Observations Summary
  62. GRB 971024: KPNO Optical Observations Summary
  63. GRB 971024: Refined analysis by USNOFS Observations
  64. GRB 971024: KPNO Optical Observations
  65. GRB 971024: USNO Observations
  66. GRB 970925: BATSE Localization
  67. IRAS 18119-1342 and the possible new SGR
  68. Possible new SGR from US Naval Observatory
  69. RXTE Observations of SGR 1814-13
  70. GRB 970828: Palomar Observations
  71. GRB 970228: Keck/LRIS Optical Observations

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