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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"

11559 results found.

  1. IPN triangulation of GRB 230625B (ultra-long)
  2. Fermi GRB 230628C: Global MASTER-Net observations report
  3. Fermi GRB 230628D: Global MASTER-Net observations report
  4. GRB 230628D: BALROG localization (Fermi Trigger 709676556 / GRB 230628849)
  5. GRB 230628D: Fermi GBM Final Real-time Localization
  6. GRB 230628C: Fermi GBM Final Real-time Localization
  7. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  8. GRB 230628A: Fermi GBM Final Localization
  9. GRB 230626A: GRBAlpha detection
  10. LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations
  11. GRB230626A: Fermi GBM Detection
  12. GRB 230625A: Fermi GBM Final Real-time Localization
  13. Fermi GBM-230619: AstroSat CZTI non-detection and upper limits for the sub-threshold candidate
  14. GRB 230621A: Fermi GBM Final Localization Correction
  15. Fermi trigger No 709083929: Global MASTER-Net observations report
  16. Fermi GBM-230619: A soft subthreshold candidate potentially associated with a subthreshold LIGO/Virgo compact binary merger candidate
  17. GRB 230618B: Fermi GBM Final Real-time Localization
  18. GRB 230617A: Fermi GBM Final Real-time Localization
  19. GRB 230614C: GRBAlpha detection
  20. GRB 230614C: AstroSat CZTI detection
  21. GRB 230614B: Fermi GBM Observation
  22. GRB 230614C: Fermi GBM Detection
  23. GRB 230614B: Swift/BAT-GUANO detection outside the coded FOV
  24. Fermi trigger No 708426906: Global MASTER-Net observations report
  25. GRB 230614B: Fermi GBM Final Real-time Localization
  26. GRB 230614A: Fermi GBM Final Real-time Localization
  27. Fermi GRB 230603A: Global MASTER-Net observations report
  28. Fermi trigger No 707039690: Global MASTER-Net observations report
  29. GRB 230606A: Fermi GBM Observation
  30. Fermi-LAT gamma-ray observations of IceCube-230603A
  31. IceCube-230603A - IceCube observation of a high-energy neutrino candidate track-like event
  32. GRB 230603A: Fermi GBM Final Real-time Localization
  33. GRB 230525A: CALET Gamma-Ray Burst Monitor detection
  34. LIGO/Virgo/KAGRA S230529ay: Upper limits from Fermi-GBM Observations
  35. GRB 230529A: Fermi GBM Final Real-time Localization
  36. Fermi-LAT gamma-ray observations of IceCube-230524A
  37. GRB 230525A: Fermi GBM Detection
  38. GRB 230525A: Fermi GBM Final Localization
  39. GRB 230524A: Fermi GBM Observation
  40. IceCube-230524A - IceCube observation of a high-energy neutrino candidate track-like event
  41. GRB 230524B: AstroSat CZTI detection
  42. GRB 230524A: AstroSat CZTI detection
  43. GRB 230524A: AGILE detection
  44. Fermi trigger No 706610076: Global MASTER-Net observations report
  45. GRB 230524A: Fermi GBM Final Real-time Localization
  46. Fermi trigger No 706599831: Global MASTER-Net observations report
  47. Fermi trigger No 706536788: Global MASTER-Net observations report
  48. Fermi Gamma-ray Burst Monitor trigger 706536788/230523509 is not a GRB
  49. GRB 230523A: Fermi GBM Final Real-time Localization
  50. GRB 230518B: VZLUSAT-2 detection
  51. Fermi Gamma-ray Burst Monitor trigger 706338208/230521211 is not a GRB
  52. Fermi trigger No 706328428: Global MASTER-Net observations report
  53. IPN triangulation of GRB 230518A (short)
  54. Fermi trigger No 706331483: Global MASTER-Net observations report
  55. Fermi trigger No 706317104: Global MASTER-Net observations report
  56. GRB 230521A: Fermi GBM Final Real-time Localization
  57. GRB 230520B is not a GRB
  58. GRB 230520B: Fermi GBM Final Real-time Localization
  59. GRB 230518A: Fermi GBM Observation
  60. GRB 230518A: Swift/BAT-GUANO detection
  61. GRB 230518A: Fermi GBM Final Real-time Localization
  62. Fermi Gamma-ray Burst Monitor trigger 706068974/230518095 is not a GRB
  63. LIGO/Virgo/KAGRA S230518h: Upper limits from Fermi-GBM Observations
  64. GRB 230513A: Zwicky Transient Facility continuous observations of a Fermi Short GRB (Trigger 705709044)
  65. GRB 230510B: GRBAlpha detection
  66. Fermi trigger No 706014351: Global MASTER-Net observations report
  67. GRB 230517A: BALROG localization (Fermi Trigger 706014351 / GRB 230517462)
  68. Improved IPN triangulation of GRB 230512A
  69. GRB 230517A: Fermi GBM Final Real-time Localization
  70. GRB 230510B: Fermi GBM detection
  71. Fermi trigger No 705952199: Global MASTER-Net observations report
  72. GRB 230516A: Fermi GBM Final Real-time Localization
  73. IPN triangulation of GRB 230511D (short)
  74. IPN triangulation of GRB 230512A
  75. GRB 230513A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705709044)
  76. GRB 230512A: Nanshan/NEXT non-detection of GRB afterglow candidate
  77. GRB 230512A: Liverpool Telescope observations
  78. GRB 230512A: GIT non detection of afterglow candidate
  79. GRB 230512A: Kitab possible afterglow candidate
  80. GRB 230512A: GRBAlpha detection
  81. GRB 230510A: GRBAlpha detection
  82. GRB 230513A: Fermi GBM Final Real-time Localization
  83. Fermi trigger No 705565670: Global MASTER-Net observations report
  84. Fermi-LAT gamma-ray observations of IceCube-230511A
  85. GRB 230510A: OHP/T193 and OHP/T120 optical observations
  86. GRB 230512A: Swift-XRT observations
  87. GRB 230512A: GIT optical follow-up ZTF candidates
  88. GRB 230512A: Fermi GBM detection
  89. GRB 230512A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705565670)
  90. GRB 230430A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 704533643)
  91. GRB 230511D: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705537623)
  92. GRB 230512A: Tiled Swift observations
  93. GRB 230512A: Fermi-LAT detection
  94. GRB 230512A: AstroSat CZTI detection
  95. GRB 230512A: Fermi GBM Final Localization
  96. GRB 230510A: GIT optical upper limits
  97. GRB 230511D: Fermi GBM Final Real-time Localization
  98. IceCube-230511A: IceCube observation of a high-energy neutrino candidate
  99. GRB 230510B: AstroSat CZTI detection
  100. GRB 230511C: Fermi GBM Final Localization

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