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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"

39328 results found.

  1. GRB 240317B: Fermi GBM Final Real-time Localization
  2. GRB 240317A: Fermi GBM Final Real-time Localization
  3. X-ray transient EP240315a: VLT/X-shooter spectroscopic redshift of z = 4.859
  4. X-ray transient EP240315a: Nanshan/HMT optical upper limit
  5. Fermi trigger No 732299243: Global MASTER-Net observations report
  6. Einstein Probe detected of a fast X-ray transient EP240315a
  7. GRID detection of GRB 240306A
  8. Changes to the Fermi-GBM Triggering Thresholds
  9. GRB 240315A: Fermi GBM Final Real-time Localization
  10. Fermi GRB 240314A: Global MASTER-Net observations report
  11. GRB 240314A: Fermi GBM Final Real-time Localization
  12. GRB 240312A: Glowbug gamma-ray detection
  13. Swift Trigger 1219905 is not a GRB
  14. GRB 240312A: GECAM detection of a long burst
  15. GRB 240303C: VZLUSAT-2 detection
  16. GRB 240310A: MASTER OT J200702.72-263928.7 inside 3sigma
  17. Fermi trigger No 731839490: Global MASTER-Net observations report
  18. Fermi-LAT gamma-ray observations of IceCube-240307A
  19. GRB 240310B: Glowbug gamma-ray detection
  20. Fermi GRB 240310A: Global MASTER-Net observations report
  21. Swift GRB240309.61: Global MASTER-Net observations report
  22. GRB 240310A: Fermi GBM Final Real-time Localization
  23. GRB 240309A: MAXI/GSC detection
  24. Swift Trigger 1219325 is not a GRB
  25. GRID detection of GRB 240229A (Updated Report)
  26. GRID detection of GRB 240229A
  27. GRB 240308A: Fermi GBM Final Localization
  28. Fermi trigger No 731571927: Global MASTER-Net observations report
  29. GRB 231215A: further radio observations with the VLA
  30. GRB 240306A: Fermi GBM observation
  31. IceCube-240307A - IceCube observation of a high-energy neutrino candidate track-like event
  32. GRB 240229A: Glowbug gamma-ray detection
  33. GRB 240227A (short): Glowbug gamma-ray detection
  34. IceCube Alert 240307.32: Global MASTER-Net observations report
  35. GRB 240229A: GRBAlpha detection
  36. Konus-Wind detection of GRB 231118A
  37. GRB 240306A: AstroSat CZTI detection
  38. Fermi GRB 240306A: Global MASTER-Net observations report
  39. Fermi GRB 240305A: Global MASTER-Net observations report
  40. GRB 240306A: Swift/BAT-GUANO detection of a burst
  41. GRB 240305A: Fermi GBM observation
  42. Fermi-LAT gamma-ray observations of IceCube-240229A
  43. GRB 240305C: AstroSat CZTI detection of a short burst
  44. GRB 240306A: Fermi GBM Final Real-time Localization
  45. Swift GRB240305.18: Global MASTER-Net observations report
  46. Swift GRB240305.16: Global MASTER-Net observations report
  47. Fermi GRB 240305C: Global MASTER-Net observations report
  48. GRB 240305C: Fermi GBM Final Real-time Localization
  49. GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
  50. GRB 231028C: Glowbug gamma-ray confirmation of a prior burst
  51. GRB 240218A: ALMA detection
  52. GRB 240218A: Chandra Detection and Jet Break Confirmation
  53. GRB 240305B: Fermi GBM Final Localization
  54. Fermi trigger No 731303574: Global MASTER-Net observations report
  55. Konus-Wind detection of GRB 240227A (short/hard)
  56. GRB 240303B: VZLUSAT-2 detection
  57. GRB 240229A: VZLUSAT-2 detection
  58. Improved IPN triangulation of GRB 240227A (short)
  59. IPN triangulation of GRB 240229A
  60. GRB 240305A: Fermi GBM Final Real-time Localization
  61. Swift Trigger 1218701: Yes, we triggered on Swift J151857.0-572147 again
  62. Swift Trigger 1218696: Another trigger on Swift J151857.0-572147
  63. Transient EPW20240219aa: Optical observations with LDT
  64. Konus-Wind detection of GRB 240303B
  65. Swift Trigger 1218645: Another detection of Swift J151857.0-572147
  66. IPN triangulation of GRB 240303B
  67. GRB 240303B: Fermi GBM Detection
  68. GRB 240225B: Swift-XRT afterglow detection
  69. Swift detection of Swift J151857.0-572147
  70. GRB 240303B: CALET Gamma-Ray Burst Monitor detection
  71. Fermi trigger No 731161136: Global MASTER-Net observations report
  72. GRB 240303C: BALROG localization (Fermi Trigger 731189113 / GRB 240303837)
  73. Swift GRB 240303A: Global MASTER-Net observations report
  74. Swift J151857.0-572147: Confirmation of a new galactic transient
  75. GRB 240215A: Swift-XRT afterglow detection
  76. GRB 240303B: BALROG localization (Fermi Trigger 731161136 / GRB 240303513)
  77. GRB 240303B: Fermi GBM Final Localization
  78. GRB 240303A: Swift detection of a burst
  79. GRB 240225B: Glowbug gamma-ray detection
  80. GRB 240225C: Glowbug gamma-ray detection
  81. GRB 240225A (short): Glowbug gamma-ray detection
  82. GRB 240229A: DDOTI Upper Limits on the Afterglow
  83. GRB 240218A: NOEMA upper limit
  84. GRB 240229A: CALET Gamma-Ray Burst Monitor detection
  85. IceCube-240229A - IceCube observation of a high-energy neutrino candidate track-like event
  86. GRB 240225B: further SAO RAS optical observations
  87. Fermi GRB 240229A: Global MASTER-Net observations report
  88. IceCube Alert 240229.66: Global MASTER-Net observations report
  89. GRB 240225B: Swift ToO observations
  90. Konus-Wind detection of GRB 240225B (long)
  91. GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588)
  92. GRB 240229A: Fermi GBM Final Real-time Localization
  93. GRB 240225B: VLT/X-shooter redshift
  94. GRB 240225B : MITSuME Akeno optical afterglow candidate detection
  95. GRB 240225B: 3.6m DOT observation
  96. GRB 240225B: WINTER near-IR observations and upper limits
  97. GRB 240225B: SAO RAS optical observations
  98. GRB 240226A: GRBAlpha detection
  99. GRB 240225B: Mondy afterglow observations
  100. Fermi GRB 240227A: Global MASTER-Net observations report

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