Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

21525 results found.

  1. GRB 081128: optical observation
  2. Swift Trigger 335971: Swift/UVOT Observations
  3. GRB 081126: Fermi GBM detection
  4. GRB 081128A: optical observations
  5. Swift Trigger 335971 is probably not a real source
  6. Trigger 335971: Swift possible detection of a burst
  7. GRB081128: Swift/UVOT Upper Limits
  8. GRB 081128: Swift-XRT refined analysis
  9. GRB 081128: Liverpool Telescope afterglow confirmation
  10. GRB081128: optical observations
  11. GRB081128 : Lulin optical follow-ups
  12. GRB 081128: Swift-BAT refined analysis
  13. GRB 081128: Enhanced Swift-XRT position
  14. GRB 081128: Optical observation of xinglong TNT
  15. GRB 081128: Swift detection of a burst
  16. GRB 081126: Swift observations continuing
  17. GRB081126: Afterglow photometry from Crni Vrh
  18. GRB 081126: GRT Optical Observation
  19. GRB 081127: Swift/UVOT Upper Limits
  20. GRB 081127: Swift-XRT refined analysis
  21. GRB 081127: Enhanced Swift-XRT position
  22. GRB 081126: Confirmation of the Optical Afterglow
  23. GRB 081127: Swift-BAT refined analysis
  24. GRB 081126: Swift-XRT refined analysis
  25. GRB 081127: Swift detection of a burst
  26. GRB 081126: Swift/UVOT Observations
  27. GRB 081126: optical observations
  28. GRB 081126: Swift-BAT refined analysis
  29. GRB 081126: Enhanced Swift-XRT position
  30. GRB 081126: TAROT Calern observatory optical observations
  31. GRB 081126: Swift detection of a burst
  32. Konus-Wind observation of GRB 081121
  33. GRB081121: Fermi GBM detection
  34. GRB081121: Refined Swift/UVOT observations
  35. GRB 081121: Swift-XRT refined analysis
  36. GRB 081121: Enhanced Swift-XRT position
  37. GRB 081121: GROND observations
  38. GRB 081121: Swift-BAT refined analysis
  39. GRB081121: Swift/UVOT observations
  40. GRB 081121: Swift detection of a burst
  41. GRB 081121: ROTSE-III Detection of Optical Counterpart
  42. GRB081118 : optical upper limit
  43. GRB 081118: Swift-XRT refined analysis
  44. GRB 081118: GROND detection of afterglow
  45. GRB 081118: optical afterglow candidate
  46. GRB 081118: Swift UVOT Upper Limits
  47. GRB 081118: Swift-BAT refined analysis
  48. GRB 081118: Enhanced Swift-XRT position
  49. GRB 081118: Swift detection of a burst
  50. GRB 081109A: confirmation of possible detection host galaxy
  51. Further Swift-XRT observations of the probable GRB 081105.
  52. GRB 081102: RTT150 Optical observations
  53. GRB 081109: TAROT La Silla observatory optical observations
  54. GRB 081102: MASTER refind and final results
  55. GRB 081109: GROND redshift limit and host extinction
  56. GRB 081025: Swift-XRT further analysis
  57. GRB 081024B: Swift-XRT late-time observations
  58. Swift-BAT refined analysis of trigger 334129
  59. GRB 081109B: Swift/UVOT refined analysis
  60. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  61. GRB 081109A: Possible Swift-UVOT detection
  62. GRB 081109A, Swift-BAT refined analysis
  63. GRB 081109A: Swift-XRT refined analysis
  64. GRB 081109: Fermi GBM detection
  65. GRB 081109: Swift/UVOT upper limits
  66. Swift-BAT Trigger 334129: possible burst
  67. GRB 081109: REM NIR afterglow detection
  68. GRB 081109: Swift detection of a burst
  69. GRB 081105: GROND Upper Limits
  70. GRB 081105: Observations from OSN
  71. UVOT/Swift observations of GRB081105
  72. Swift-XRT observations of GRB 081105
  73. GRB 081105 Swift/BAT and IPN Localization
  74. GRB 081025: Fermi GBM observation
  75. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  76. GRB 081104: refined XRT analysis
  77. GRB 081104: Enhanced Swift-XRT position
  78. GRB 081104: Swift-BAT refined analysis
  79. GRB081104: Swift/UVOT Upper Limits
  80. Fermi Detection of GRB 081102
  81. GRB 081104 : Faulkes Telescope South observations
  82. GRB 081104: Swift-XRT position
  83. GRB 081104: Swift detection of a burst
  84. GRB 081102: MASTER prompt optical limit
  85. GRB 081102: Swift-XRT refined analysis
  86. GRB 081102: Swift/UVOT refined analysis
  87. GRB 081102: Swift-BAT refined analysis
  88. GRB 081102: Enhanced Swift-XRT position
  89. Radio observation of GRB 080218b with ATCA
  90. GRB 081102: MASTER VWF promt observation
  91. GRB 081102: OPTIMA-Burst optical upper limit
  92. GRB 081102: Swift detection of a burst
  93. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  94. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  95. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  96. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  97. GRB 081024B: BTA deep optical observations
  98. GRB 081028: CrAO optical observations
  99. GRB 081024B: new Swift-XRT observations
  100. Radio observation of GRB 080229b with ATCA

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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