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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"

14983 results found.

  1. GRB 200506A: Fermi GBM Final Real-time Localization
  2. GRB 200505A: Fermi GBM Final Real-time Localization
  3. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  4. AGILE detection of a short and hard X-ray burst possibly related to SGR 1935+2154
  5. GRB 200502A: AstroSat CZTI detection
  6. GRB 200503B: Fermi GBM Final Real-time Localization
  7. Geocentric time correction for Insight-HXMT detection of the x-ray counterpart of the FRB by CHIME and STARE2 from SGR 1935+2154
  8. AstroSat CZTI detection : GRB200503A
  9. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  10. GRB 200502A: Fermi GBM Final Real-time Localization
  11. GRB 200424A: Swift-XRT afterglow detection
  12. Insight-HXMT X-ray and hard X-ray detection of the double peaks of the Fast Radio Burst from SGR 1935+2154
  13. GRB 200501A: Fermi GBM Final Real-time Localization
  14. Trigger 968731: Swift detection of SGR1806-20
  15. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  16. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  17. A Forest of Bursts from SGR 1935+2154
  18. SGR 1935+2154 the Insight-HXMT observation plan
  19. SGR 1935+2154: MAXI/GSC detection
  20. IceCube-200425A: No significant detection in HAWC
  21. Swift detection of multiple bursts from SGR 1935+2154
  22. Gagarin-day GRB 200412B: observations with the 3.6m Devasthal Optical Telescope
  23. IceCube-200425A - IceCube observation of a high-energy neutrino candidate event
  24. IPN triangulation of GRB 200423A (short)
  25. GRB 200425B: Fermi GBM Final Real-time Localization
  26. GRB 200424A: AstroSat CZTI detection
  27. GRB 200425A: Swift detection of a burst
  28. Konus-Wind observation of GRB 200422A
  29. GRB 200423A: Fermi GBM Final Real-time Localization
  30. Konus-Wind observation of a bright burst from SGR 1935+2154
  31. GRB 200422A: AstroSat CZTI detection
  32. IPN Triangulation of a bright burst from SGR 1935+2154
  33. IceCube-200421A: No Neutrino Counterpart in ANTARES data
  34. IceCube-200421A: No significant detection in HAWC
  35. GRB 200421A: Fermi GBM Final Real-time Localization
  36. IceCube-200421A - IceCube observation of a high-energy neutrino candidate event
  37. GRB 200420A: Fermi GBM Final Real-time Localization
  38. GRB 200416A: Swift/UVOT Detection
  39. GRB 200415A: MASTER imspection and possible localisation
  40. GRB200412B: GROWTH India detection of afterglow
  41. GRB 200416A: Swift detection of a burst with an optical afterglow
  42. GRB 200412A : AstroSat CZTI detection
  43. GRB 200415A: Fermi-LAT detection
  44. IPN triangulation of GRB 200415A (possible Magnetar Giant Flare in Sculptor Galaxy?)
  45. GRB 200410A: CALET Gamma-Ray Burst Monitor detection
  46. Konus-Wind observation of GRB 200412B
  47. GRB 200415A: Fermi GBM Final Real-time Localization
  48. Konus-Wind observation of GRB 200412A
  49. GRB 200412B: CALET Gamma-Ray Burst Monitor detection
  50. IceCube-200410A: No significant detection in HAWC
  51. GRB 200412B: Insight-HXMT/HE detection
  52. GRB 200412B: Optical afterglow detection with 1.3m DFOT
  53. GRB 200412B : AstroSat CZTI detection
  54. IceCube-200410A : Upper limits from Insight-HXMT/HE observations
  55. GRB 200412B: Swift-XRT afterglow detection
  56. IPN triangulation of GRB 200412A
  57. GRB 200412B: Fermi GBM detection
  58. GRB 200412B: Fermi-LAT detection
  59. GRB 200412B: MASTER Optical Couterpart in Gagarin day!
  60. GRB 200412A: Fermi GBM detection
  61. GRB 200412B: Fermi GBM Final Real-time Localization
  62. GRB 200411A: Swift detection of a short burst
  63. GRB 200411A: Fermi GBM Final Real-time Localization
  64. IceCube-200410A - IceCube observation of a high-energy neutrino candidate event
  65. GRB 200410A: Swift/UVOT Detection
  66. Konus-Wind observation of GRB 200327A
  67. GRB 200409A: No detection of radio emission 5 hours post-burst
  68. GRB 200410A: Swift detection of a burst with a possible optical counterpart
  69. GRB 200405B: ATCA follow-up and ASKAP limits on pre-burst radio emission
  70. Fermi GBM Sub-Threshold Detection of GRB 200409A
  71. GRB 200409A: Swift detection of a burst with an optical counterpart
  72. IPN triangulation of GRB 200407A (short)
  73. GRB 200407B: Fermi GBM Final Real-time Localization
  74. GRB 200407A: Fermi GBM Final Real-time Localization
  75. GRB 200405B: Swift/BAT-GUANO detection and *possible* arcminute localization of a short GRB
  76. GRB 200405A: Fermi GBM Final Real-time Localization
  77. GRB 200404A: Fermi GBM Final Localization
  78. GRB 200403A: AstroSat CZTI detection
  79. GRB 200403C: Fermi GBM Final Real-time Localization
  80. GRB 200403B: Fermi GBM Final Real-time Localization
  81. GRB 200403A: Fermi GBM Final Real-time Localization
  82. GRB 200402C: Fermi GBM Final Localization
  83. GRB 200402B: Fermi GBM Final Localization
  84. GRB 200402A: Fermi GBM Final Real-time Localization
  85. GRB 200401A: Fermi GBM Final Real-time Localization
  86. GRB 200327A: Fermi GBM detection
  87. IPN triangulation of GRB 200327A (short)
  88. GRB 200326B: AstroSat CZTI detection
  89. GRB 200327A: Fermi GBM Final Real-time Localization
  90. GRB 200325B: LCO Optical Detection
  91. GRB 200326B: AstroSat LAXPC detection
  92. IPN triangulation of GRB 200325A (short)
  93. GRB 200326A: Fermi GBM Final Real-time Localization
  94. GRB 200325B: MASTERt OT detection
  95. GRB 200325A: Swift/BAT detection and probable arcminute localization of a short GRB from GUANO
  96. GRB 200325B: Fermi GBM Final Real-time Localization
  97. GRB 200325A: AstroSat CZTI detection
  98. GRB 200325A: AGILE/MCAL observations
  99. GRB 200325A: Fermi GBM Final Real-time Localization
  100. GRB 200324A: Konkoly Obs. optical upper limit

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