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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"

1520 results found.

  1. IceCube-220907A: Upper limits from a search for additional neutrino events in IceCube
  2. IceCube-220907A: One Candidate Counterpart from the Zwicky Transient Facility
  3. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  4. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  5. IceCube Alert 220907.28: Global MASTER-Net observations report
  6. IceCube-220822A: No significant detection in HAWC
  7. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  8. IceCube-220822A: Classification of AT2022saw as a Type Ia supernova
  9. IceCube-220822A: Upper limits from a search for additional neutrino events in IceCube
  10. IceCube-220822A: One Candidate Counterpart from the Zwicky Transient Facility
  11. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  12. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  13. IceCube Alert 220822.85: Global MASTER-Net observations report
  14. IceCube Astrotrack Bronze 136918_45252263.amon is likely background
  15. IceCube Alert 220808.33: Global MASTER-Net observations report
  16. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220728A
  17. IceCube-220624A: Classification of AT2022nit as a type Ia supernova and AT2021bei as an AGN
  18. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  19. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  20. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  21. IceCube-220629A: No significant detection in HAWC
  22. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  23. IceCube-220627A: No significant detection in HAWC
  24. IceCube Alert 220629.99: Global MASTER-Net observations report
  25. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  26. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  27. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  28. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  29. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  30. IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event
  31. IceCube Alert 220627.74: Global MASTER-Net observations report
  32. IceCube-220624A: Upper limits from a search for additional neutrino events in IceCube
  33. IceCube-220624A: No significant detection in HAWC
  34. IceCube-220624A: No Candidate Counterparts from the Zwicky Transient Facility
  35. IceCube Alert 220624.68: Global MASTER-Net observations report
  36. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  37. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  38. IceCube-220524A: Upper limits from a search for additional neutrino events in IceCube
  39. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event
  40. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  41. IceCube-220513A: Upper limits from a search for additional neutrino events in IceCube
  42. IceCube-220513A: No significant detection in HAWC
  43. IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility
  44. IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event
  45. IceCube Alert 220513.97: Global MASTER-Net observations report
  46. IceCube-220509A: No significant detection in HAWC
  47. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  48. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  49. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  50. IceCube Alert 220509.76: Global MASTER-Net observations report
  51. IceCube-220405B - ZTF19aavnpjv unrelated
  52. IceCube-220501A: Upper limits from a search for additional neutrino events in IceCube
  53. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  54. IceCube-220501A: No Candidate Counterparts from the Zwicky Transient Facility
  55. IceCube-220501A - IceCube observation of a high-energy neutrino candidate track-like event
  56. IceCube Alert 220501.95: Global MASTER-Net observations report
  57. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  58. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  59. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  60. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  61. IceCube-220425A: MASTER: flaring blazar TXS 1742-078 as the possible neutrino source candidate
  62. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  63. IceCube Alert 220425.11: Global MASTER-Net observations report
  64. IceCube-220425A - IceCube observation of a high-energy neutrino candidate track-like event
  65. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  66. IceCube Alert 220424.05: Global MASTER-Net observations report
  67. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  68. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  69. IceCube Alert 220421.22: Global MASTER-Net observations report
  70. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  71. IceCube-220405A: No Candidate Counterparts from the Zwicky Transient Facility
  72. IceCube-220405B: No Candidate Counterparts from the Zwicky Transient Facility
  73. IceCube Alert 220405.93: Global MASTER-Net observations report
  74. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  75. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  76. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  77. IceCube Alert 220405.21: Global MASTER-Net observations report
  78. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  79. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  80. IceCube-220317A: MASTER Global Robotic Net optical observations
  81. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  82. IceCube-220306A: No significant detection in HAWC
  83. IceCube-220303A: No significant detection in HAWC
  84. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  85. IceCube-220304A: Upper limits from a search for additional neutrino events in IceCube
  86. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  87. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  88. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  89. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  90. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  91. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  92. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  93. IceCube Alert 220304.74: Global MASTER-Net observations report
  94. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  95. IceCube Alert 220303.75: Global MASTER-Net observations report
  96. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  97. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  98. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  99. IceCube Alert 220225.59: Global MASTER-Net observations report
  100. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event

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