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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').
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"

1526 results found.

  1. IceCube-220907A: Classification of AT2022oyn as a Type Ia supernova
  2. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  3. IceCube-220918A: Upper limits from a search for additional neutrino events in IceCube
  4. IceCube Alert 220918.53: Global MASTER-Net observations report
  5. IceCube-220918A - IceCube observation of a high-energy neutrino candidate track-like event
  6. IceCube-220907A: No significant detection in HAWC
  7. IceCube-220907A: Upper limits from a search for additional neutrino events in IceCube
  8. IceCube-220907A: One Candidate Counterpart from the Zwicky Transient Facility
  9. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  10. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  11. IceCube Alert 220907.28: Global MASTER-Net observations report
  12. IceCube-220822A: No significant detection in HAWC
  13. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  14. IceCube-220822A: Classification of AT2022saw as a Type Ia supernova
  15. IceCube-220822A: Upper limits from a search for additional neutrino events in IceCube
  16. IceCube-220822A: One Candidate Counterpart from the Zwicky Transient Facility
  17. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  18. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  19. IceCube Alert 220822.85: Global MASTER-Net observations report
  20. IceCube Astrotrack Bronze 136918_45252263.amon is likely background
  21. IceCube Alert 220808.33: Global MASTER-Net observations report
  22. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220728A
  23. IceCube-220624A: Classification of AT2022nit as a type Ia supernova and AT2021bei as an AGN
  24. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  25. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  26. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  27. IceCube-220629A: No significant detection in HAWC
  28. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  29. IceCube-220627A: No significant detection in HAWC
  30. IceCube Alert 220629.99: Global MASTER-Net observations report
  31. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  32. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  33. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  34. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  35. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  36. IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event
  37. IceCube Alert 220627.74: Global MASTER-Net observations report
  38. IceCube-220624A: Upper limits from a search for additional neutrino events in IceCube
  39. IceCube-220624A: No significant detection in HAWC
  40. IceCube-220624A: No Candidate Counterparts from the Zwicky Transient Facility
  41. IceCube Alert 220624.68: Global MASTER-Net observations report
  42. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  43. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  44. IceCube-220524A: Upper limits from a search for additional neutrino events in IceCube
  45. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event
  46. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  47. IceCube-220513A: Upper limits from a search for additional neutrino events in IceCube
  48. IceCube-220513A: No significant detection in HAWC
  49. IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility
  50. IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event
  51. IceCube Alert 220513.97: Global MASTER-Net observations report
  52. IceCube-220509A: No significant detection in HAWC
  53. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  54. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  55. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  56. IceCube Alert 220509.76: Global MASTER-Net observations report
  57. IceCube-220405B - ZTF19aavnpjv unrelated
  58. IceCube-220501A: Upper limits from a search for additional neutrino events in IceCube
  59. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  60. IceCube-220501A: No Candidate Counterparts from the Zwicky Transient Facility
  61. IceCube-220501A - IceCube observation of a high-energy neutrino candidate track-like event
  62. IceCube Alert 220501.95: Global MASTER-Net observations report
  63. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  64. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  65. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  66. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  67. IceCube-220425A: MASTER: flaring blazar TXS 1742-078 as the possible neutrino source candidate
  68. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  69. IceCube Alert 220425.11: Global MASTER-Net observations report
  70. IceCube-220425A - IceCube observation of a high-energy neutrino candidate track-like event
  71. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  72. IceCube Alert 220424.05: Global MASTER-Net observations report
  73. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  74. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  75. IceCube Alert 220421.22: Global MASTER-Net observations report
  76. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  77. IceCube-220405A: No Candidate Counterparts from the Zwicky Transient Facility
  78. IceCube-220405B: No Candidate Counterparts from the Zwicky Transient Facility
  79. IceCube Alert 220405.93: Global MASTER-Net observations report
  80. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  81. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  82. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  83. IceCube Alert 220405.21: Global MASTER-Net observations report
  84. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  85. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  86. IceCube-220317A: MASTER Global Robotic Net optical observations
  87. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  88. IceCube-220306A: No significant detection in HAWC
  89. IceCube-220303A: No significant detection in HAWC
  90. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  91. IceCube-220304A: Upper limits from a search for additional neutrino events in IceCube
  92. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  93. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  94. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  95. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  96. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  97. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  98. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  99. IceCube Alert 220304.74: Global MASTER-Net observations report
  100. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A

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