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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"

11528 results found.

  1. IPN triangulation of extremely bright GRB 221009A
  2. Fermi trigger No 687014224: Global MASTER-Net observations report
  3. GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection
  4. GRB 221009A: Fermi GBM detection of an extraordinarily bright GRB
  5. GRB 221009A: Swift detected transient may be GRB
  6. GRB 220915A: Detection by GRBAlpha
  7. GRB 220912A: Detection by VZLUSAT-2
  8. Fermi trigger No 686588176: Global MASTER-Net observations report
  9. GRB220927A: Detection by GRBAlpha
  10. Fermi GBM trigger 686565116/221004355 is not a GRB
  11. Fermi GBM trigger 686435254/221002852 is not a GRB
  12. Fermi GBM trigger 686350260/221001869 is not a GRB
  13. Fermi trigger No 686403226: Global MASTER-Net observations report
  14. Fermi trigger No 686350260: Global MASTER-Net observations report
  15. Fermi-LAT gamma-ray observations of IceCube-220928A
  16. Konus-Wind detection of GRB 220927A
  17. IceCube-220928A - IceCube observation of a high-energy neutrino candidate track-like event
  18. Fermi GRB 220927A: Global MASTER-Net observations report
  19. IPN triangulation of GRB 220927A (long)
  20. GRB 220921A: LCOGT Optical Observations
  21. GRB 220927A: Fermi GBM Final Localization
  22. GRB 220924A: Fermi GBM detection
  23. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  24. Fermi GRB 220925A: Global MASTER-Net observations report
  25. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  26. GRB 220925A: Fermi GBM Final Real-time Localization
  27. Fermi trigger No 685748699: Global MASTER-Net observations report
  28. GRB 220924A: Fermi GBM Final Real-time Localization
  29. GRB 220921A: DDOTI Detection of the Afterglow
  30. Konus-Wind detection of GRB 220921A
  31. GRB 220921A: Fermi GBM detection
  32. GRB 220921A: MeerLICHT afterglow observations
  33. GRB 220921A: Swift-XRT Observations
  34. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  35. GRB 220921A: Fermi-LAT detection
  36. GRB 220921A: Tiled Swift observations
  37. Fermi trigger No 685452089: Global MASTER-Net observations report
  38. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  39. IceCube-220918A - IceCube observation of a high-energy neutrino candidate track-like event
  40. Fermi trigger No 684894705: Global MASTER-Net observations report
  41. Improved IPN error box for GRB 220910A
  42. Fermi trigger No 684927323: Global MASTER-Net observations report
  43. Fermi trigger No 684911625: Global MASTER-Net observations report
  44. GRB 220909A: Fermi GBM observation
  45. Konus-Wind detection of GRB 220910A
  46. GRB 220910B: Fermi GBM Final Localization
  47. Fermi trigger No 684716840: Global MASTER-Net observations report
  48. Fermi GRB 220912A: Global MASTER-Net observations report
  49. GRB 220910A: Fermi GBM observation
  50. IPN triangulation of GRB 220910A (bright/long)
  51. GRB 220912A: AstroSat CZTI detection
  52. GRB 220912A: Fermi GBM Final Real-time Localization
  53. IPN triangulation of GRB 220905A
  54. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  55. GRB 220909A: Fermi GBM Final Real-time Localization
  56. IPN triangulation of GRB 220903A (long)
  57. GRB 220907A: Fermi GBM observation
  58. GRB 220907A: Nanshan/NEXT optical upper limits
  59. GRB 220831A: ATCA 5/9 GHz radio observations
  60. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  61. GRB 220907A: Swift detection of a burst
  62. GRB 220907A: Fermi GBM Final Real-time Localization
  63. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  64. Fermi GRB 220905A: Global MASTER-Net observations report
  65. GRB 220905A: BALROG localization (Fermi Trigger 684070128 / GRB 220905478)
  66. GRB 220905A: Fermi GBM Final Real-time Localization
  67. Fermi GRB 220902A: Global MASTER-Net observations report
  68. GRB 220902A: Fermi GBM Final Real-time Localization
  69. GRB 220831C: Fermi GBM Final Localization
  70. GRB 220831A: Fermi GBM observation
  71. GRB 220831B: Fermi GBM Final Localization
  72. Fermi trigger No 683654200: Global MASTER-Net observations report
  73. Fermi trigger No 683646997: Global MASTER-Net observations report
  74. Fermi trigger No 683537972: Global MASTER-Net observations report
  75. Fermi GBM trigger 683571622/220830709 is not a GRB
  76. Fermi trigger No 683476673: Global MASTER-Net observations report
  77. Konus-Wind detection of GRB 220826A
  78. GRB 220827A: Fermi GBM Final Real-time Localization
  79. GRB 220826A: Fermi GBM observation
  80. Fermi trigger No 683202084: Global MASTER-Net observations report
  81. Fermi trigger No 683183601: Global MASTER-Net observations report
  82. Fermi trigger No 683152759: Global MASTER-Net observations report
  83. GRB 220825A: Fermi GBM observation
  84. GRB 220825A: Swift/BAT-GUANO detection
  85. GRB 220825A: Fermi GBM Final Localization
  86. GRB 220823A: Fermi GBM detection
  87. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  88. Fermi trigger No 682918137: Global MASTER-Net observations report
  89. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  90. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  91. GRB 220821A: Fermi GBM Final Real-time Localization
  92. GRB 220810A: Further Swift-XRT observations
  93. GRB 220810A: Swift-XRT observations
  94. Fermi trigger No 681998863: Global MASTER-Net observations report
  95. GRB 220810A: Swift ToO observations
  96. GRB 220810A: MeerLICHT detection of two afterglow candidates
  97. Fermi GBM trigger 681998863/220812505 is not a GRB
  98. Fermi trigger No 681890304: Global MASTER-Net observations report
  99. Fermi GBM trigger 681890304/220811249 is not a GRB
  100. Fermi GRB 220810A: Global MASTER-Net observations report

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