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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"

36424 results found.

  1. GRB 220831A: Swift-UVOT Upper Limits
  2. Fermi GRB 220905A: Global MASTER-Net observations report
  3. GRB 220905A: BALROG localization (Fermi Trigger 684070128 / GRB 220905478)
  4. GRB 220905A: Fermi GBM Final Real-time Localization
  5. GRB 220831A: DECam detection of a possible optical counterpart
  6. Fermi GRB 220902A: Global MASTER-Net observations report
  7. GRB 220902A: Fermi GBM Final Real-time Localization
  8. GRB 220831A, VLT/HAWK-I near-infrared observations
  9. GRB 220831C: Fermi GBM Final Localization
  10. GRB 220831A: Fermi GBM observation
  11. GRB 220831A: Swift-XRT observations
  12. GRB 220831B: Fermi GBM Final Localization
  13. GRB 220831A: Swift ToO observations
  14. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  15. Fermi GBM trigger 683571622/220830709 is not a GRB
  16. Konus-Wind detection of GRB 220826A
  17. GRB 220827A: Fermi GBM Final Real-time Localization
  18. GRB 220826A: Swift-BAT refined analysis
  19. GRB 220826A: Fermi GBM observation
  20. GRB 220826A: Swift-XRT refined Analysis
  21. GRB 220825A: Fermi GBM observation
  22. GRB 220826A: Lesedi optical afterglow detection
  23. GRB 220826A: Swift/UVOT Detection
  24. GRB 220826A: iTelescope optical afterglow observations
  25. Swift GRB 220826A: Global MASTER-Net observations report
  26. GRB 220826A: Enhanced Swift-XRT position
  27. GRB 220826A: Swift detection of a burst with an optical counterpart
  28. GRB 220825A: Swift/BAT-GUANO detection
  29. GRB 220825A: Fermi GBM Final Localization
  30. GRB 220823A: Fermi GBM detection
  31. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  32. GRB 220821A: Fermi GBM Final Real-time Localization
  33. Konus-Wind detection of GRB 220813A
  34. GRB 220813A: VLT optical observations and possible host galaxy
  35. GRB 220813A: Swift/UVOT Detection
  36. GRB 220810A: Further Swift-XRT observations
  37. GRB 220813A: Swift-XRT refined Analysis
  38. Swift GRB 220813A: Global MASTER-Net observations report
  39. GRB 220813A: Enhanced Swift-XRT position
  40. GRB 220813A: Swift detection of a burst with an optical counterpart
  41. GRB 220810A: Swift-XRT observations
  42. GRB 220719B: Detection by VZLUSAT-2
  43. GRB 220810A: Swift ToO observations
  44. GRB 220810A: MeerLICHT detection of two afterglow candidates
  45. Fermi GBM trigger 681998863/220812505 is not a GRB
  46. Fermi GBM trigger 681890304/220811249 is not a GRB
  47. Fermi GRB 220810A: Global MASTER-Net observations report
  48. GRB 220810A: Fermi GBM Final Real-time Localization
  49. GRB 220627A: MeerKAT radio observations
  50. GRB 220806A: Swift-BAT refined analysis
  51. Fermi GBM trigger 681719116/220809267 is not a GRB
  52. Fermi GBM trigger 681633544/220808277 is not a GRB
  53. Fermi GBM trigger 681547990 / 220807287 is not a GRB
  54. GRB 220806A: Swift detection of a burst
  55. GRB 220804A: Fermi GBM Final Localization
  56. GRB 220803A: AstroSat CZTI detection
  57. Konus-Wind detection of GRB 220730A (short)
  58. GRB 220730A: Swift-BAT refined analysis
  59. GRB 220730A: Fermi GBM detection
  60. GRB 220730A: Swift-XRT afterglow detection
  61. GRB 220730A: Swift/UVOT Upper Limits
  62. GRB 220730A: Swift-XRT observations
  63. GRB 220729A: AstroSat CZTI detection
  64. Swift GRB 220730A: Global MASTER-Net observations report
  65. GRB 220730A: Swift detection of a short hard burst
  66. Fermi GRB 220728A: Global MASTER-Net observations report
  67. GRB 220728A: Fermi GBM Final Real-time Localization
  68. GRB 220726A: Fermi GBM Final Real-time Localization
  69. Fermi GRB 220724A: Global MASTER-Net observations report
  70. GRB 220724A: Fermi GBM Final Real-time Localization
  71. GRB 220715B: VIRT Optical Upper Limit
  72. Fermi GRB 220721A: Global MASTER-Net observations report
  73. GRB 220721A: Fermi GBM Final Real-time Localization
  74. Introducing new GCN Kafka broker and web site for transient alerts, https://gcn.nasa.gov
  75. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  76. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  77. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  78. GRB 220719A: Fermi GBM Final Real-time Localization
  79. GRB 220715B: Swift-BAT refined analysis
  80. GRB220714B: UVOT detections
  81. GRB 220715B: Fermi GBM detection
  82. GRB 220715B: Swift-XRT refined Analysis
  83. GRB 220715B: Swift/UVOT Upper Limits
  84. GRB 220715B: Enhanced Swift-XRT position
  85. GRB 220715B: BOOTES-network optical upper limits
  86. Swift GRB 220715B: Global MASTER-Net observations report
  87. GRB 220715B: Prompt enhanced Swift-XRT position
  88. GRB 220715B: Swift detection of a burst
  89. GRB 220715B: Fermi GBM Final Real-time Localization
  90. GRB 220714B: Swift-BAT refined analysis
  91. GRB 220714B: Fermi GBM observation
  92. GRB 220715A: AGILE/MCAL detection
  93. GRB 220714B: LCO Optical Observations
  94. GRB 220715A: Fermi GBM Final Real-time Localization
  95. GRB 220714B: Swift-XRT refined Analysis
  96. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  97. GRB 220714B: UVOT afterglow discovery
  98. GRB 220714B: Enhanced Swift-XRT position
  99. GRB 220713A: Fermi GBM Final Localization
  100. GRB 220714B: Swift detection of a burst

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