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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"

11560 results found.

  1. GRB 230701A: Fermi GBM Final Real-time Localization
  2. IPN triangulation of GRB 230625B (ultra-long)
  3. Fermi GRB 230628C: Global MASTER-Net observations report
  4. Fermi GRB 230628D: Global MASTER-Net observations report
  5. GRB 230628D: BALROG localization (Fermi Trigger 709676556 / GRB 230628849)
  6. GRB 230628D: Fermi GBM Final Real-time Localization
  7. GRB 230628C: Fermi GBM Final Real-time Localization
  8. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  9. GRB 230628A: Fermi GBM Final Localization
  10. GRB 230626A: GRBAlpha detection
  11. LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations
  12. GRB230626A: Fermi GBM Detection
  13. GRB 230625A: Fermi GBM Final Real-time Localization
  14. Fermi GBM-230619: AstroSat CZTI non-detection and upper limits for the sub-threshold candidate
  15. GRB 230621A: Fermi GBM Final Localization Correction
  16. Fermi trigger No 709083929: Global MASTER-Net observations report
  17. Fermi GBM-230619: A soft subthreshold candidate potentially associated with a subthreshold LIGO/Virgo compact binary merger candidate
  18. GRB 230618B: Fermi GBM Final Real-time Localization
  19. GRB 230617A: Fermi GBM Final Real-time Localization
  20. GRB 230614C: GRBAlpha detection
  21. GRB 230614C: AstroSat CZTI detection
  22. GRB 230614B: Fermi GBM Observation
  23. GRB 230614C: Fermi GBM Detection
  24. GRB 230614B: Swift/BAT-GUANO detection outside the coded FOV
  25. Fermi trigger No 708426906: Global MASTER-Net observations report
  26. GRB 230614B: Fermi GBM Final Real-time Localization
  27. GRB 230614A: Fermi GBM Final Real-time Localization
  28. Fermi GRB 230603A: Global MASTER-Net observations report
  29. Fermi trigger No 707039690: Global MASTER-Net observations report
  30. GRB 230606A: Fermi GBM Observation
  31. Fermi-LAT gamma-ray observations of IceCube-230603A
  32. IceCube-230603A - IceCube observation of a high-energy neutrino candidate track-like event
  33. GRB 230603A: Fermi GBM Final Real-time Localization
  34. GRB 230525A: CALET Gamma-Ray Burst Monitor detection
  35. LIGO/Virgo/KAGRA S230529ay: Upper limits from Fermi-GBM Observations
  36. GRB 230529A: Fermi GBM Final Real-time Localization
  37. Fermi-LAT gamma-ray observations of IceCube-230524A
  38. GRB 230525A: Fermi GBM Detection
  39. GRB 230525A: Fermi GBM Final Localization
  40. GRB 230524A: Fermi GBM Observation
  41. IceCube-230524A - IceCube observation of a high-energy neutrino candidate track-like event
  42. GRB 230524B: AstroSat CZTI detection
  43. GRB 230524A: AstroSat CZTI detection
  44. GRB 230524A: AGILE detection
  45. Fermi trigger No 706610076: Global MASTER-Net observations report
  46. GRB 230524A: Fermi GBM Final Real-time Localization
  47. Fermi trigger No 706599831: Global MASTER-Net observations report
  48. Fermi trigger No 706536788: Global MASTER-Net observations report
  49. Fermi Gamma-ray Burst Monitor trigger 706536788/230523509 is not a GRB
  50. GRB 230523A: Fermi GBM Final Real-time Localization
  51. GRB 230518B: VZLUSAT-2 detection
  52. Fermi Gamma-ray Burst Monitor trigger 706338208/230521211 is not a GRB
  53. Fermi trigger No 706328428: Global MASTER-Net observations report
  54. IPN triangulation of GRB 230518A (short)
  55. Fermi trigger No 706331483: Global MASTER-Net observations report
  56. Fermi trigger No 706317104: Global MASTER-Net observations report
  57. GRB 230521A: Fermi GBM Final Real-time Localization
  58. GRB 230520B is not a GRB
  59. GRB 230520B: Fermi GBM Final Real-time Localization
  60. GRB 230518A: Fermi GBM Observation
  61. GRB 230518A: Swift/BAT-GUANO detection
  62. GRB 230518A: Fermi GBM Final Real-time Localization
  63. Fermi Gamma-ray Burst Monitor trigger 706068974/230518095 is not a GRB
  64. LIGO/Virgo/KAGRA S230518h: Upper limits from Fermi-GBM Observations
  65. GRB 230513A: Zwicky Transient Facility continuous observations of a Fermi Short GRB (Trigger 705709044)
  66. GRB 230510B: GRBAlpha detection
  67. Fermi trigger No 706014351: Global MASTER-Net observations report
  68. GRB 230517A: BALROG localization (Fermi Trigger 706014351 / GRB 230517462)
  69. Improved IPN triangulation of GRB 230512A
  70. GRB 230517A: Fermi GBM Final Real-time Localization
  71. GRB 230510B: Fermi GBM detection
  72. Fermi trigger No 705952199: Global MASTER-Net observations report
  73. GRB 230516A: Fermi GBM Final Real-time Localization
  74. IPN triangulation of GRB 230511D (short)
  75. IPN triangulation of GRB 230512A
  76. GRB 230513A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705709044)
  77. GRB 230512A: Nanshan/NEXT non-detection of GRB afterglow candidate
  78. GRB 230512A: Liverpool Telescope observations
  79. GRB 230512A: GIT non detection of afterglow candidate
  80. GRB 230512A: Kitab possible afterglow candidate
  81. GRB 230512A: GRBAlpha detection
  82. GRB 230510A: GRBAlpha detection
  83. GRB 230513A: Fermi GBM Final Real-time Localization
  84. Fermi trigger No 705565670: Global MASTER-Net observations report
  85. Fermi-LAT gamma-ray observations of IceCube-230511A
  86. GRB 230510A: OHP/T193 and OHP/T120 optical observations
  87. GRB 230512A: Swift-XRT observations
  88. GRB 230512A: GIT optical follow-up ZTF candidates
  89. GRB 230512A: Fermi GBM detection
  90. GRB 230512A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705565670)
  91. GRB 230430A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 704533643)
  92. GRB 230511D: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705537623)
  93. GRB 230512A: Tiled Swift observations
  94. GRB 230512A: Fermi-LAT detection
  95. GRB 230512A: AstroSat CZTI detection
  96. GRB 230512A: Fermi GBM Final Localization
  97. GRB 230510A: GIT optical upper limits
  98. GRB 230511D: Fermi GBM Final Real-time Localization
  99. IceCube-230511A: IceCube observation of a high-energy neutrino candidate
  100. GRB 230510B: AstroSat CZTI detection

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