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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"

35953 results found.

  1. GRB 220831B: Fermi GBM Final Localization
  2. GRB 220831A: Swift ToO observations
  3. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  4. Fermi GBM trigger 683571622/220830709 is not a GRB
  5. Konus-Wind detection of GRB 220826A
  6. GRB 220827A: Fermi GBM Final Real-time Localization
  7. GRB 220826A: Swift-BAT refined analysis
  8. GRB 220826A: Fermi GBM observation
  9. GRB 220826A: Swift-XRT refined Analysis
  10. GRB 220825A: Fermi GBM observation
  11. GRB 220826A: Lesedi optical afterglow detection
  12. GRB 220826A: Swift/UVOT Detection
  13. GRB 220826A: iTelescope optical afterglow observations
  14. Swift GRB 220826A: Global MASTER-Net observations report
  15. GRB 220826A: Enhanced Swift-XRT position
  16. GRB 220826A: Swift detection of a burst with an optical counterpart
  17. GRB 220825A: Swift/BAT-GUANO detection
  18. GRB 220825A: Fermi GBM Final Localization
  19. GRB 220823A: Fermi GBM detection
  20. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  21. GRB 220821A: Fermi GBM Final Real-time Localization
  22. Konus-Wind detection of GRB 220813A
  23. GRB 220813A: VLT optical observations and possible host galaxy
  24. GRB 220813A: Swift/UVOT Detection
  25. GRB 220810A: Further Swift-XRT observations
  26. GRB 220813A: Swift-XRT refined Analysis
  27. Swift GRB 220813A: Global MASTER-Net observations report
  28. GRB 220813A: Enhanced Swift-XRT position
  29. GRB 220813A: Swift detection of a burst with an optical counterpart
  30. GRB 220810A: Swift-XRT observations
  31. GRB 220719B: Detection by VZLUSAT-2
  32. GRB 220810A: Swift ToO observations
  33. GRB 220810A: MeerLICHT detection of two afterglow candidates
  34. Fermi GBM trigger 681998863/220812505 is not a GRB
  35. Fermi GBM trigger 681890304/220811249 is not a GRB
  36. Fermi GRB 220810A: Global MASTER-Net observations report
  37. GRB 220810A: Fermi GBM Final Real-time Localization
  38. GRB 220627A: MeerKAT radio observations
  39. GRB 220806A: Swift-BAT refined analysis
  40. Fermi GBM trigger 681719116/220809267 is not a GRB
  41. Fermi GBM trigger 681633544/220808277 is not a GRB
  42. Fermi GBM trigger 681547990 / 220807287 is not a GRB
  43. GRB 220806A: Swift detection of a burst
  44. GRB 220804A: Fermi GBM Final Localization
  45. GRB 220803A: AstroSat CZTI detection
  46. Konus-Wind detection of GRB 220730A (short)
  47. GRB 220730A: Swift-BAT refined analysis
  48. GRB 220730A: Fermi GBM detection
  49. GRB 220730A: Swift-XRT afterglow detection
  50. GRB 220730A: Swift/UVOT Upper Limits
  51. GRB 220730A: Swift-XRT observations
  52. GRB 220729A: AstroSat CZTI detection
  53. Swift GRB 220730A: Global MASTER-Net observations report
  54. GRB 220730A: Swift detection of a short hard burst
  55. Fermi GRB 220728A: Global MASTER-Net observations report
  56. GRB 220728A: Fermi GBM Final Real-time Localization
  57. GRB 220726A: Fermi GBM Final Real-time Localization
  58. Fermi GRB 220724A: Global MASTER-Net observations report
  59. GRB 220724A: Fermi GBM Final Real-time Localization
  60. GRB 220715B: VIRT Optical Upper Limit
  61. Fermi GRB 220721A: Global MASTER-Net observations report
  62. GRB 220721A: Fermi GBM Final Real-time Localization
  63. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  64. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  65. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  66. GRB 220719A: Fermi GBM Final Real-time Localization
  67. GRB 220715B: Swift-BAT refined analysis
  68. GRB220714B: UVOT detections
  69. GRB 220715B: Fermi GBM detection
  70. GRB 220715B: Swift-XRT refined Analysis
  71. GRB 220715B: Swift/UVOT Upper Limits
  72. GRB 220715B: Enhanced Swift-XRT position
  73. GRB 220715B: BOOTES-network optical upper limits
  74. Swift GRB 220715B: Global MASTER-Net observations report
  75. GRB 220715B: Prompt enhanced Swift-XRT position
  76. GRB 220715B: Swift detection of a burst
  77. GRB 220715B: Fermi GBM Final Real-time Localization
  78. GRB 220714B: Swift-BAT refined analysis
  79. GRB 220714B: Fermi GBM observation
  80. GRB 220715A: AGILE/MCAL detection
  81. GRB 220714B: LCO Optical Observations
  82. GRB 220715A: Fermi GBM Final Real-time Localization
  83. GRB 220714B: Swift-XRT refined Analysis
  84. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  85. GRB 220714B: UVOT afterglow discovery
  86. GRB 220714B: Enhanced Swift-XRT position
  87. GRB 220713A: Fermi GBM Final Localization
  88. GRB 220714B: Swift detection of a burst
  89. GRB 220714B: Fermi GBM Final Real-time Localization
  90. GRB 220714A: Possible Swift detection of a burst
  91. GRB 220710A: Swift/UVOT Upper Limits
  92. GRB 220711C: Fermi GBM Observation
  93. Retraction of GRB 220711B: 10.4 m GTC(+EMIR) observations (GCN 32387)
  94. GRB 220711B: 10.4 m GTC(+EMIR) observations
  95. GRB 220711B: 10.4 m GTC(+EMIR) observations
  96. GRB 220710A: Swift-XRT afterglow detection
  97. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  98. GRB 220711B, GROND observations
  99. Konus-Wind detection of GRB 220711C
  100. GRB 220711B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)

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