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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"

11519 results found.

  1. Fermi GBM trigger 686565116/221004355 is not a GRB
  2. Fermi GBM trigger 686435254/221002852 is not a GRB
  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. Fermi-LAT gamma-ray observations of IceCube-220928A
  7. Konus-Wind detection of GRB 220927A
  8. IceCube-220928A - IceCube observation of a high-energy neutrino candidate track-like event
  9. Fermi GRB 220927A: Global MASTER-Net observations report
  10. IPN triangulation of GRB 220927A (long)
  11. GRB 220921A: LCOGT Optical Observations
  12. GRB 220927A: Fermi GBM Final Localization
  13. GRB 220924A: Fermi GBM detection
  14. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  15. Fermi GRB 220925A: Global MASTER-Net observations report
  16. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  17. GRB 220925A: Fermi GBM Final Real-time Localization
  18. Fermi trigger No 685748699: Global MASTER-Net observations report
  19. GRB 220924A: Fermi GBM Final Real-time Localization
  20. GRB 220921A: DDOTI Detection of the Afterglow
  21. Konus-Wind detection of GRB 220921A
  22. GRB 220921A: Fermi GBM detection
  23. GRB 220921A: MeerLICHT afterglow observations
  24. GRB 220921A: Swift-XRT Observations
  25. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  26. GRB 220921A: Fermi-LAT detection
  27. GRB 220921A: Tiled Swift observations
  28. Fermi trigger No 685452089: Global MASTER-Net observations report
  29. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  30. IceCube-220918A - IceCube observation of a high-energy neutrino candidate track-like event
  31. Fermi trigger No 684894705: Global MASTER-Net observations report
  32. Improved IPN error box for GRB 220910A
  33. Fermi trigger No 684927323: Global MASTER-Net observations report
  34. Fermi trigger No 684911625: Global MASTER-Net observations report
  35. GRB 220909A: Fermi GBM observation
  36. Konus-Wind detection of GRB 220910A
  37. GRB 220910B: Fermi GBM Final Localization
  38. Fermi trigger No 684716840: Global MASTER-Net observations report
  39. Fermi GRB 220912A: Global MASTER-Net observations report
  40. GRB 220910A: Fermi GBM observation
  41. IPN triangulation of GRB 220910A (bright/long)
  42. GRB 220912A: AstroSat CZTI detection
  43. GRB 220912A: Fermi GBM Final Real-time Localization
  44. IPN triangulation of GRB 220905A
  45. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  46. GRB 220909A: Fermi GBM Final Real-time Localization
  47. IPN triangulation of GRB 220903A (long)
  48. GRB 220907A: Fermi GBM observation
  49. GRB 220907A: Nanshan/NEXT optical upper limits
  50. GRB 220831A: ATCA 5/9 GHz radio observations
  51. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  52. GRB 220907A: Swift detection of a burst
  53. GRB 220907A: Fermi GBM Final Real-time Localization
  54. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  55. Fermi GRB 220905A: Global MASTER-Net observations report
  56. GRB 220905A: BALROG localization (Fermi Trigger 684070128 / GRB 220905478)
  57. GRB 220905A: Fermi GBM Final Real-time Localization
  58. Fermi GRB 220902A: Global MASTER-Net observations report
  59. GRB 220902A: Fermi GBM Final Real-time Localization
  60. GRB 220831C: Fermi GBM Final Localization
  61. GRB 220831A: Fermi GBM observation
  62. GRB 220831B: Fermi GBM Final Localization
  63. Fermi trigger No 683654200: Global MASTER-Net observations report
  64. Fermi trigger No 683646997: Global MASTER-Net observations report
  65. Fermi trigger No 683537972: Global MASTER-Net observations report
  66. Fermi GBM trigger 683571622/220830709 is not a GRB
  67. Fermi trigger No 683476673: Global MASTER-Net observations report
  68. Konus-Wind detection of GRB 220826A
  69. GRB 220827A: Fermi GBM Final Real-time Localization
  70. GRB 220826A: Fermi GBM observation
  71. Fermi trigger No 683202084: Global MASTER-Net observations report
  72. Fermi trigger No 683183601: Global MASTER-Net observations report
  73. Fermi trigger No 683152759: Global MASTER-Net observations report
  74. GRB 220825A: Fermi GBM observation
  75. GRB 220825A: Swift/BAT-GUANO detection
  76. GRB 220825A: Fermi GBM Final Localization
  77. GRB 220823A: Fermi GBM detection
  78. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  79. Fermi trigger No 682918137: Global MASTER-Net observations report
  80. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  81. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  82. GRB 220821A: Fermi GBM Final Real-time Localization
  83. GRB 220810A: Further Swift-XRT observations
  84. GRB 220810A: Swift-XRT observations
  85. Fermi trigger No 681998863: Global MASTER-Net observations report
  86. GRB 220810A: Swift ToO observations
  87. GRB 220810A: MeerLICHT detection of two afterglow candidates
  88. Fermi GBM trigger 681998863/220812505 is not a GRB
  89. Fermi trigger No 681890304: Global MASTER-Net observations report
  90. Fermi GBM trigger 681890304/220811249 is not a GRB
  91. Fermi GRB 220810A: Global MASTER-Net observations report
  92. GRB 220810A: Fermi GBM Final Real-time Localization
  93. GRB 220627A: MeerKAT radio observations
  94. Fermi trigger No 681719116: Global MASTER-Net observations report
  95. Fermi GBM trigger 681719116/220809267 is not a GRB
  96. Fermi trigger No 681633544: Global MASTER-Net observations report
  97. Fermi GBM trigger 681633544/220808277 is not a GRB
  98. Fermi GBM trigger 681547990 / 220807287 is not a GRB
  99. GRB 220804A: Fermi GBM Final Localization
  100. Fermi trigger No 681271717: Global MASTER-Net observations report

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