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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"

4169 results found.

  1. GRB 221006A: Swift-XRT observations
  2. GRB 221006A: MAXI/GSC detection
  3. Fermi GBM trigger 686350260/221001869 is not a GRB
  4. Fermi trigger No 686403226: Global MASTER-Net observations report
  5. Fermi trigger No 686350260: Global MASTER-Net observations report
  6. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  7. Fermi GRB 220925A: Global MASTER-Net observations report
  8. Fermi trigger No 685748699: Global MASTER-Net observations report
  9. GRB 220921A: MeerLICHT afterglow observations
  10. Fermi trigger No 685452089: Global MASTER-Net observations report
  11. Fermi trigger No 684894705: Global MASTER-Net observations report
  12. Konus-Wind detection of GRB 220910A
  13. Fermi GRB 220912A: Global MASTER-Net observations report
  14. IPN triangulation of GRB 220905A
  15. Fermi GRB 220905A: Global MASTER-Net observations report
  16. Fermi GRB 220902A: Global MASTER-Net observations report
  17. Fermi trigger No 683654200: Global MASTER-Net observations report
  18. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  19. Fermi trigger No 683202084: Global MASTER-Net observations report
  20. Fermi trigger No 683183601: Global MASTER-Net observations report
  21. Fermi trigger No 683152759: Global MASTER-Net observations report
  22. Fermi trigger No 682918137: Global MASTER-Net observations report
  23. IceCube Alert 220822.85: Global MASTER-Net observations report
  24. GRB 220730A: Swift-BAT refined analysis
  25. GRB 220730A: Swift-XRT afterglow detection
  26. GRB 220730A: Swift-XRT observations
  27. GRB 220729A: AstroSat CZTI detection
  28. GRB 220730A: Swift detection of a short hard burst
  29. Fermi trigger No 680782656: Global MASTER-Net observations report
  30. Fermi GRB 220728A: Global MASTER-Net observations report
  31. Fermi GRB 220721A: Global MASTER-Net observations report
  32. Fermi GRB 220711B: Global MASTER-Net observations report
  33. GRB 220710A: Swift/BAT-GUANO arcminute localization
  34. GRB 220708A: Swift detection of a burst
  35. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  36. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  37. IceCube-220629A: No significant detection in HAWC
  38. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  39. IceCube Alert 220629.99: Global MASTER-Net observations report
  40. Trigger 1113743: Swift detection of MAXI J0655-013
  41. Fermi GRB 220623B: Global MASTER-Net observations report
  42. IPN triangulation of GRB 220624A
  43. Fermi GRB 220620A: Global MASTER-Net observations report
  44. GRB 220617A: Swift-XRT observations
  45. GRB 220618A: Swift detection of a burst
  46. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  47. IPN triangulation of GRB 220606C
  48. Fermi trigger No 676909037: Global MASTER-Net observations report
  49. Fermi GRB 220610A: Global MASTER-Net observations report
  50. Fermi trigger No 676537486: Global MASTER-Net observations report
  51. Fermi trigger No 675992935: Global MASTER-Net observations report
  52. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  53. Fermi trigger No 675411172: Global MASTER-Net observations report
  54. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  55. IPN triangulation of GRB 220524B
  56. Konus-Wind detection of GRB 220521B
  57. IPN triangulation of GRB 220521B
  58. Fermi GRB 220523B: Global MASTER-Net observations report
  59. GRB 220523A: Fermi GBM Final Real-time Localization
  60. Fermi GRB 220522A: Global MASTER-Net observations report
  61. GRB 220514A: AstroSat CZTI detection
  62. Fermi GRB 220518B: Global MASTER-Net observations report
  63. IceCube Alert 220513.97: Global MASTER-Net observations report
  64. Fermi GRB 220513A: Global MASTER-Net observations report
  65. IceCube-220509A: No significant detection in HAWC
  66. Fermi trigger No 673846271: Global MASTER-Net observations report
  67. MAXI GRB220506.27: Global MASTER-Net observations report
  68. IPN triangulation of GRB 220423A
  69. Fermi GRB 220426A: Global MASTER-Net observations report
  70. Fermi trigger No 672374264: Global MASTER-Net observations report
  71. Fermi GRB 220417A: Global MASTER-Net observations report
  72. Fermi trigger No 671729344: Global MASTER-Net observations report
  73. GRB 220408B: Fermi GBM observation
  74. Fermi GRB 220411A: Global MASTER-Net observations report
  75. GRB 220408A: 1.3m DFOT Optical upper limit
  76. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  77. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  78. IceCube Alert 220405.21: Global MASTER-Net observations report
  79. Swift GRB 220403B: Global MASTER-Net observations report
  80. Fermi GRB 220401B: Global MASTER-Net observations report
  81. GRB 220401B: Fermi GBM Final Real-time Localization
  82. Fermi GRB 220330A: Global MASTER-Net observations report
  83. Konus-Wind observation of GRB 220320A
  84. GRB 220325A: MASTER Global Robotic Net optical observations
  85. GRB 220310A: MAXI/GSC detection
  86. IceCube-220303A: No significant detection in HAWC
  87. Fermi GRB 220309A: Global MASTER-Net observations report
  88. Fermi trigger No 668410535: Global MASTER-Net observations report
  89. Fermi GRB 220306A: Global MASTER-Net observations report
  90. GRB 220305A: Swift detection of a burst
  91. IceCube Alert 220303.75: Global MASTER-Net observations report
  92. IceCube Alert 220225.59: Global MASTER-Net observations report
  93. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  94. Fermi GRB 220222B: Global MASTER-Net observations report
  95. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  96. IceCube Alert 220220.60: Global MASTER-Net observations report
  97. Fermi trigger No 666962499: Global MASTER-Net observations report
  98. Swift GRB220218.94: Global MASTER-Net observations report
  99. GRB 220211A: redshift lower limit estimating
  100. IPN triangulation of GRB 220209A

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