Skip to main content
GCN at AAS 245, Legacy Circulars Address Retirement. See news and announcements

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').

18054 results found.

  1. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  2. GRB 080822B: Swift detection of a burst
  3. Third event from SGR 0501+4516
  4. New Soft Gamma Repeater 0501+4516 was GRB 080822
  5. GRB 080822: Swift detection of a short burst
  6. Radio detection of GRB 080810 with the VLA
  7. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  8. GLAST Burst Monitor detection of GRB 080810
  9. GRB 080810: Swift/UVOT Refined Analysis
  10. GRB 080810: D50 optical observation
  11. GRB 080810: Kanazawa optical observation
  12. GRB 080810: Swift-XRT Team refined analysis
  13. GRB 080810: Enhanced Swift-XRT position
  14. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  15. GRB 080810, Swift-BAT refined analysis
  16. GRB 080810: Swift detection of a burst with a bright optical afterglow
  17. GRB 080723B: XMM-Newton observation
  18. GRB 080727B: Late VLT imaging
  19. GRB 080805: Swift-XRT Refined Analysis
  20. GRB 080805: Swift/UVOT Upper Limits
  21. GRB 080804: Swift-XRT Refined Analysis
  22. GRB 080804: Swift/UVOT Refined Analysis
  23. GRB 080805, Swift-BAT refined analysis
  24. GRB 080804, Swift-BAT refined analysis
  25. GRB 080804: Enhanced Swift-XRT position
  26. GRB 080804: Faulkes Telescope South observations
  27. GRB080805 optical limit by "Pi of the Sky"
  28. GRB 080805: Swift detection of a burst
  29. GRB 080804: Swift detection of a burst with optical afterglow
  30. GRB 080804: ROTSE-III Detection of Optical Counterpart
  31. GRB 080802: Swift/UVOT Upper Limits
  32. GRB 080802: Swift-XRT Refined Analysis
  33. GRB 080802, Swift-BAT refined analysis
  34. GRB 080802: Swift detection of a probable burst
  35. GRB 080727C: Suzaku WAM observation of the prompt emission
  36. GRB 080727C: TAROT Calern observatory optical observations
  37. GRB 080727B: GROND redshift limit
  38. GRB 080727C, Swift-BAT refined analysis
  39. GRB 080727C: Swift/UVOT Upper Limits
  40. Konus-Wind observation of GRB 080727B
  41. GRB 080727C: Swift XRT refined analysis
  42. GRB 080727C: Enhanced Swift-XRT position
  43. GRB080727C: RTT150 optical observations
  44. GRB 080727C: Swift detection of a burst
  45. Swift detection of XTE J1701-407
  46. GRB 080727B: Swift/UVOT Upper Limits
  47. BAT Trigger 318150 is not a GRB
  48. GRB 080727B: Swift-XRT refined analysis
  49. GRB 080727B, Swift-BAT refined analysis
  50. GRB 080727A, Swift-BAT refined analysis
  51. GRB 080727A: Swift-XRT refined analysis
  52. GRB080727A: Swift/UVOT Upper Limits
  53. GRB 080727B: Enhanced Swift-XRT position
  54. GRB 080727A: Enhanced Swift-XRT position
  55. GRB 080727B: Swift detection of a bright burst
  56. GRB 080727: Swift detection of a burst
  57. GRB 080725, Swift-BAT refined analysis
  58. GRB 080723A: optical upper limit
  59. GRB080723B: Swift/UVOT Upper Limits
  60. GRB 080725: Swift detection of a burst
  61. GRB 080723A: Swift/UVOT Upper Limits
  62. GRB 080723B - correction to flux conversion factor
  63. GRB 080723B - Swift-XRT refined analysis
  64. GRB 080723B - Swift-XRT position
  65. GRB 080723, Swift-BAT refined analysis
  66. GRB 080723A: Swift-XRT refined analysis
  67. GRB 080723: Enhanced Swift-XRT position
  68. GRB 080723: Swift detection of a burst
  69. TNG/DOLORES redshift for GRB080721
  70. GRB 080721: UVOT Follow-Up Observations
  71. Konus-Wind observation of GRB 080721
  72. GRB 080721: Swift-XRT refined analysis
  73. GRB 080721: Enhanced Swift-XRT position
  74. GRB 080721, Swift-BAT refined analysis
  75. GRB 080721: Swift/UVOT Photometric Redshift
  76. GRB 080721: Swift-XRT correct position
  77. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  78. Retraction of Swift Trigger 317393
  79. Trigger 317393: Swift detection of a possible GRB
  80. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  81. GRB 080714: GROND confirmation of the optical/NIR afterglow
  82. Konus-Wind observation of GRB 080714
  83. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  84. GRB 080714: Swift-XRT refined analysis
  85. GRB 080714: Enhanced Swift-XRT position
  86. GRB 080714: Swift-BAT refined analysis
  87. GRB 080714: Swift detection of a burst
  88. GRB 080603B: optical observations in MAO
  89. GRB 080603B: optical observations in CrAO
  90. GRB 080710: TLS observations, steepening afterglow decay
  91. GRB 080702B: Swift XRT confirmation of the afterglow
  92. GRB 080710, Swift-BAT refined analysis
  93. GRB 080710: Swift-XRT refined analysis
  94. GRB080710: Swift/UVOT observations
  95. GRB 080710: Enhanced Swift-XRT position
  96. UVOT white band observations of GRB080710
  97. GRB 080710: KAIT OA candidate
  98. GRB 080710: Swift XRT position
  99. GRB 080710: Swift detection of a burst
  100. GRB 080707: possible break in the X-rays

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov