Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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').
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"

8473 results found.

  1. ZTF23aaarlti/AT2023avj: AMI-LA radio detection
  2. ZTF23aabmzlp/AT2023azs: AMI-LA radio upper limit
  3. IceCube-230201A - IceCube observation of a high-energy neutrino candidate track-like event
  4. GRB 221009A: radio afterglow detection with the EVN
  5. ZTF23aabmzlp/AT2023azs: LCOGT Optical Detection
  6. ZTF23aabmzlp/AT2023azs: 1.3m DFOT optical observations
  7. ZTF23aabmzlp/AT2023azs: GIT confirmation of the likely afterglow
  8. IceCube-230122A: BOOTES-2/TELMA Optical Upper Limit
  9. AT2023avj ZTF Candidate: Assy optical observations
  10. ZTF and LT Observations of AT2023avj, a Candidate Optical Afterglow
  11. IceCube-230122A: Upper limits from a search for additional neutrino events in IceCube
  12. GRB 230123A: Swift detection of a burst
  13. IceCube-230122A - IceCube observation of a high-energy neutrino candidate track-like event
  14. GRB 230116D: Swift detection of a burst
  15. IceCube-230112A: No Candidate Counterparts from the Zwicky Transient Facility
  16. IceCube-230112A: Upper limits from a search for additional neutrino events in IceCube
  17. IceCube-230112A: BOOTES-4/MET Optical Upper Limit
  18. IceCube-230112A - IceCube observation of a high-energy neutrino candidate track-like event
  19. IceCube-Cascade 230109A: Upper limits from a search for additional neutrino events in IceCube
  20. GRB 221231A: 3.6m DOT optical upper limit
  21. IceCube-221223A: No Candidate Counterparts from the Zwicky Transient Facility
  22. GRB 221231A: Swift ToO observations
  23. Subject: IceCube-Cascade 221229A: Upper limits from a search for additional neutrino events in IceCube
  24. IceCube-221229A: Upper limits from a search for additional neutrino events in IceCube
  25. IceCube-221229A: BOOTES-2/TELMA Optical Upper Limit
  26. IceCube-221229A - IceCube observation of a high-energy neutrino candidate track-like event
  27. IceCube-221224A: Upper limits from a search for additional neutrino events in IceCube
  28. IceCube-221223A: Upper limits from a search for additional neutrino events in IceCube
  29. GRB 221226B: Swift detection of a burst
  30. IceCube-221224A: BOOTES-4/MET Optical Upper Limit
  31. IceCube-221223A: BOOTES-4/MET Optical Observations
  32. IceCube-221224A - IceCube observation of a high-energy neutrino candidate track-like event
  33. IceCube-221223A - IceCube observation of a high-energy neutrino candidate track-like event
  34. GRB 221218A: 3.6m DOT optical upper limit
  35. IceCube-221216A: No Candidate Counterparts from the Zwicky Transient Facility
  36. GRB 221218A: KAIT Optical Upper Limit
  37. IceCube-221210A: BOOTES-4/MET and Lijiang 2.4-meter Telescopes Optical Observations
  38. GRB 221215A: Fermi GBM Detection
  39. IceCube-221216A: Upper limits from a search for additional neutrino events in IceCube
  40. GRB 221216A: Swift detection of a burst
  41. IceCube-221216A - IceCube observation of a high-energy neutrino candidate track-like event
  42. GRB 221215A: Swift ToO observations
  43. Konus-Wind detection of GRB 221209A
  44. IceCube-221210A: Upper limits from a search for additional neutrino events in IceCube
  45. IceCube-221210A - IceCube observation of a high-energy neutrino candidate track-like event
  46. GRB 221206B: Swift/BAT-GUANO candidate arcminute localization
  47. GRB 221206B: Swift ToO observations
  48. GRB 221202A: Swift detection of a burst
  49. GRB 221201A: Swift detection of a burst
  50. IceCube-221124A: Upper limits from a search for additional neutrino events in IceCube
  51. IceCube-221124A: BOOTES-4/MET and BOOTES-2/TELMA optical upper limit
  52. IceCube-221124A - IceCube observation of a high-energy neutrino candidate track-like event
  53. GRB221120A: WIRC near-IR imaging of the afterglow candidate
  54. GRB 221120A: Liverpool Telescope Upper Limits
  55. GRB 221120A: Archival PS1 Imaging of Faint Source near XRT position
  56. GRB 221120A: LDT Optical Afterglow Candidate
  57. GRB 221120A: Swift detection of a likely short burst
  58. GRB 221119A: Detection by GRBAlpha
  59. GRB 221110A: GRANDMA observations
  60. GRB 221110A: LCOGT Optical Afterglow Detection
  61. GRB 221110A: Swift detection of a burst with an optical counterpart
  62. IceCube-221104A: Upper limits from a search for additional neutrino events in IceCube
  63. IceCube-221104A - IceCube observation of a high-energy neutrino candidate track-like event
  64. High-precision position of the compact radio counterpart to GRB221009A
  65. GRB 221027B: Swift detection of a burst
  66. GRB 221024A: D50 candidate afterglow
  67. GRB 221022A: Swift ToO observations
  68. GRB 221024A: Swift detection of a burst
  69. GRB 221022A: Swift/BAT-GUANO detection
  70. The probability of observing GRB 221009A at z = 0.151
  71. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  72. GRB 221017A: Swift ToO observations
  73. GRB 221016A: Swift detection of a burst
  74. GRB 221009A: Large Binocular Telescope Observatory optical afterglow detection
  75. MAXI GRB 221006A: Redshifts of the possible host galaxies
  76. GRB 221009A: search for neutrinos with KM3NeT
  77. Afterglow limits of GRB 221006A from OHP
  78. GRB 221009A/Swift J1913.1+1946: SMA observations
  79. GRB 221006A: Swift ToO observations
  80. Konus-Wind detection of GRB 221009A
  81. GRB 221009A: Upper limits from a neutrino search with IceCube
  82. GRB 221009A / Swift J1913.1+1946: GIT detection of the optical afterglow
  83. GRB 221009A/Swift J1913.1+1946: AMI-LA observations
  84. Swift J1913.1+1946 a new bright hard X-ray and optical transient
  85. GRB 221008A: Tiled Swift observations
  86. GRB 221006A: Tiled Swift observations
  87. GRB 220921A: ATCA detection of radio counterpart
  88. GRB 220930A: Swift detection of a burst
  89. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  90. IceCube-220928A - IceCube observation of a high-energy neutrino candidate track-like event
  91. GRB 220921A: LCOGT Optical Observations
  92. GRB 220926A: Swift detection of a burst
  93. IceCube-220907A: Classification of AT2022oyn as a Type Ia supernova
  94. GRB 220921A: Tiled Swift observations
  95. IceCube-220918A: Upper limits from a search for additional neutrino events in IceCube
  96. IceCube-220918A - IceCube observation of a high-energy neutrino candidate track-like event
  97. IceCube-220907A: No significant detection in HAWC
  98. GRB 220909A: Swift ToO observations
  99. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  100. IceCube-220907A: Upper limits from a search for additional neutrino events in IceCube

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