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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"

39409 results found.

  1. GRB 220907A: Nanshan/NEXT optical upper limits
  2. GRB 220907A: Swift/UVOT Upper Limits
  3. GRB 220907A: Swift-XRT refined Analysis
  4. GRB 220831A: ATCA 5/9 GHz radio observations
  5. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  6. GRB 220907A: Swift-XRT position
  7. GRB 220907A: Swift detection of a burst
  8. GRB 220907A: Fermi GBM Final Real-time Localization
  9. Swift GRB220907.59: Global MASTER-Net observations report
  10. IceCube Alert 220907.28: Global MASTER-Net observations report
  11. GRB 220831A: Swift-UVOT Upper Limits
  12. Fermi GRB 220905A: Global MASTER-Net observations report
  13. GRB 220905A: BALROG localization (Fermi Trigger 684070128 / GRB 220905478)
  14. GRB 220905A: Fermi GBM Final Real-time Localization
  15. GRB 220831A: DECam detection of a possible optical counterpart
  16. Fermi GRB 220902A: Global MASTER-Net observations report
  17. GRB 220902A: Fermi GBM Final Real-time Localization
  18. GRB 220831A, VLT/HAWK-I near-infrared observations
  19. GRB 220831C: Fermi GBM Final Localization
  20. GRB 220831A: Fermi GBM observation
  21. GRB 220831A: Swift-XRT observations
  22. GRB 220831B: Fermi GBM Final Localization
  23. GRB 220831A: Swift ToO observations
  24. Fermi trigger No 683654200: Global MASTER-Net observations report
  25. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  26. Fermi trigger No 683646997: Global MASTER-Net observations report
  27. Fermi trigger No 683537972: Global MASTER-Net observations report
  28. Fermi GBM trigger 683571622/220830709 is not a GRB
  29. Fermi trigger No 683476673: Global MASTER-Net observations report
  30. Konus-Wind detection of GRB 220826A
  31. GRB 220827A: Fermi GBM Final Real-time Localization
  32. GRB 220826A: Swift-BAT refined analysis
  33. GRB 220826A: Fermi GBM observation
  34. Fermi trigger No 683202084: Global MASTER-Net observations report
  35. Fermi trigger No 683183601: Global MASTER-Net observations report
  36. Fermi trigger No 683152759: Global MASTER-Net observations report
  37. GRB 220826A: Swift-XRT refined Analysis
  38. GRB 220825A: Fermi GBM observation
  39. GRB 220826A: Lesedi optical afterglow detection
  40. GRB 220826A: Swift/UVOT Detection
  41. GRB 220826A: iTelescope optical afterglow observations
  42. Swift GRB 220826A: Global MASTER-Net observations report
  43. GRB 220826A: Enhanced Swift-XRT position
  44. GRB 220826A: Swift detection of a burst with an optical counterpart
  45. GRB 220825A: Swift/BAT-GUANO detection
  46. GRB 220825A: Fermi GBM Final Localization
  47. GRB 220823A: Fermi GBM detection
  48. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  49. Fermi trigger No 682918137: Global MASTER-Net observations report
  50. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  51. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  52. IceCube Alert 220822.85: Global MASTER-Net observations report
  53. GRB 220821A: Fermi GBM Final Real-time Localization
  54. Konus-Wind detection of GRB 220813A
  55. GRB 220813A: VLT optical observations and possible host galaxy
  56. GRB 220813A: Swift/UVOT Detection
  57. GRB 220810A: Further Swift-XRT observations
  58. GRB 220813A: Swift-XRT refined Analysis
  59. Swift GRB 220813A: Global MASTER-Net observations report
  60. GRB 220813A: Enhanced Swift-XRT position
  61. GRB 220813A: Swift detection of a burst with an optical counterpart
  62. GRB 220810A: Swift-XRT observations
  63. GRB 220719B: Detection by VZLUSAT-2
  64. Fermi trigger No 681998863: Global MASTER-Net observations report
  65. GRB 220810A: Swift ToO observations
  66. GRB 220810A: MeerLICHT detection of two afterglow candidates
  67. Fermi GBM trigger 681998863/220812505 is not a GRB
  68. Fermi trigger No 681890304: Global MASTER-Net observations report
  69. Fermi GBM trigger 681890304/220811249 is not a GRB
  70. Fermi GRB 220810A: Global MASTER-Net observations report
  71. GRB 220810A: Fermi GBM Final Real-time Localization
  72. GRB 220627A: MeerKAT radio observations
  73. GRB 220806A: Swift-BAT refined analysis
  74. Fermi trigger No 681719116: Global MASTER-Net observations report
  75. Fermi GBM trigger 681719116/220809267 is not a GRB
  76. Fermi trigger No 681633544: Global MASTER-Net observations report
  77. Fermi GBM trigger 681633544/220808277 is not a GRB
  78. IceCube Alert 220808.33: Global MASTER-Net observations report
  79. Fermi GBM trigger 681547990 / 220807287 is not a GRB
  80. GRB 220806A: Swift detection of a burst
  81. Swift GRB220806.76: Global MASTER-Net observations report
  82. GRB 220804A: Fermi GBM Final Localization
  83. Fermi trigger No 681271717: Global MASTER-Net observations report
  84. GRB 220803A: AstroSat CZTI detection
  85. Fermi trigger No 681212354: Global MASTER-Net observations report
  86. Konus-Wind detection of GRB 220730A (short)
  87. GRB 220730A: Swift-BAT refined analysis
  88. GRB 220730A: Fermi GBM detection
  89. GRB 220730A: Swift-XRT afterglow detection
  90. GRB 220730A: Swift/UVOT Upper Limits
  91. GRB 220730A: Swift-XRT observations
  92. GRB 220729A: AstroSat CZTI detection
  93. Swift GRB 220730A: Global MASTER-Net observations report
  94. GRB 220730A: Swift detection of a short hard burst
  95. Fermi trigger No 680782656: Global MASTER-Net observations report
  96. Fermi GRB 220728A: Global MASTER-Net observations report
  97. GRB 220728A: Fermi GBM Final Real-time Localization
  98. GRB 220726A: Fermi GBM Final Real-time Localization
  99. Fermi trigger No 680421061: Global MASTER-Net observations report
  100. Fermi GRB 220724A: Global MASTER-Net observations report

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