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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"

39437 results found.

  1. GRB 220806A: Swift-BAT refined analysis
  2. Fermi trigger No 681719116: Global MASTER-Net observations report
  3. Fermi GBM trigger 681719116/220809267 is not a GRB
  4. Fermi trigger No 681633544: Global MASTER-Net observations report
  5. Fermi GBM trigger 681633544/220808277 is not a GRB
  6. IceCube Alert 220808.33: Global MASTER-Net observations report
  7. Fermi GBM trigger 681547990 / 220807287 is not a GRB
  8. GRB 220806A: Swift detection of a burst
  9. Swift GRB220806.76: Global MASTER-Net observations report
  10. GRB 220804A: Fermi GBM Final Localization
  11. Fermi trigger No 681271717: Global MASTER-Net observations report
  12. GRB 220803A: AstroSat CZTI detection
  13. Fermi trigger No 681212354: Global MASTER-Net observations report
  14. Konus-Wind detection of GRB 220730A (short)
  15. GRB 220730A: Swift-BAT refined analysis
  16. GRB 220730A: Fermi GBM detection
  17. GRB 220730A: Swift-XRT afterglow detection
  18. GRB 220730A: Swift/UVOT Upper Limits
  19. GRB 220730A: Swift-XRT observations
  20. GRB 220729A: AstroSat CZTI detection
  21. Swift GRB 220730A: Global MASTER-Net observations report
  22. GRB 220730A: Swift detection of a short hard burst
  23. Fermi trigger No 680782656: Global MASTER-Net observations report
  24. Fermi GRB 220728A: Global MASTER-Net observations report
  25. GRB 220728A: Fermi GBM Final Real-time Localization
  26. GRB 220726A: Fermi GBM Final Real-time Localization
  27. Fermi trigger No 680421061: Global MASTER-Net observations report
  28. Fermi GRB 220724A: Global MASTER-Net observations report
  29. GRB 220724A: Fermi GBM Final Real-time Localization
  30. GRB 220715B: VIRT Optical Upper Limit
  31. Fermi GRB 220721A: Global MASTER-Net observations report
  32. GRB 220721A: Fermi GBM Final Real-time Localization
  33. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  34. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  35. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  36. GRB 220719A: Fermi GBM Final Real-time Localization
  37. GRB 220715B: Swift-BAT refined analysis
  38. GRB220714B: UVOT detections
  39. GRB 220715B: Fermi GBM detection
  40. GRB 220715B: Swift-XRT refined Analysis
  41. GRB 220715B: Swift/UVOT Upper Limits
  42. GRB 220715B: Enhanced Swift-XRT position
  43. GRB 220715B: BOOTES-network optical upper limits
  44. Swift GRB 220715B: Global MASTER-Net observations report
  45. GRB 220715B: Prompt enhanced Swift-XRT position
  46. GRB 220715B: Swift detection of a burst
  47. GRB 220715B: Fermi GBM Final Real-time Localization
  48. GRB 220714B: Swift-BAT refined analysis
  49. GRB 220714B: Fermi GBM observation
  50. GRB 220715A: AGILE/MCAL detection
  51. GRB 220714B: LCO Optical Observations
  52. GRB 220715A: Fermi GBM Final Real-time Localization
  53. GRB 220714B: Swift-XRT refined Analysis
  54. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  55. GRB 220714B: UVOT afterglow discovery
  56. GRB 220714B: Enhanced Swift-XRT position
  57. GRB 220713A: Fermi GBM Final Localization
  58. GRB 220714B: Swift detection of a burst
  59. GRB 220714B: Fermi GBM Final Real-time Localization
  60. GRB 220714A: Possible Swift detection of a burst
  61. GRB 220710A: Swift/UVOT Upper Limits
  62. GRB 220711C: Fermi GBM Observation
  63. Retraction of GRB 220711B: 10.4 m GTC(+EMIR) observations (GCN 32387)
  64. GRB 220711B: 10.4 m GTC(+EMIR) observations
  65. GRB 220711B: 10.4 m GTC(+EMIR) observations
  66. GRB 220710A: Swift-XRT afterglow detection
  67. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  68. GRB 220711B, GROND observations
  69. Konus-Wind detection of GRB 220711C
  70. GRB 220711B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  71. GRB 220711B: GIT optical upper limits
  72. Fermi trigger No 679248723: Global MASTER-Net observations report
  73. Fermi GRB 220711B: Global MASTER-Net observations report
  74. GRB 220712B: NOT optical afterglow confirmation
  75. GRB 220710A: Swift ToO observations
  76. GRB 220710A: Swift/BAT-GUANO arcminute localization
  77. GRB 220711B: Swift-BAT refined analysis
  78. IPN triangulation of GRB 220711C (short)
  79. GRB 220711B: Swift-XRT refined Analysis
  80. GRB 220711B: Swift/UVOT Upper Limits
  81. GRB 220711B: Enhanced Swift-XRT position
  82. GRB 220711B: Fermi GBM Detection
  83. GRB 220711B: NOT optical observations
  84. GRB 220711B: LCO Optical Upper Limits
  85. GRB 220711B: Swift detection of a burst
  86. GRB 220711B: Fermi GBM Final Real-time Localization
  87. GRB 220707A: AstroSat CZTI detection
  88. GRB 220708B: GIT optical upper limits
  89. GRB 220711A: Fermi GBM Final Real-time Localization
  90. GRB 220708A: Swift-BAT refined analysis
  91. GRB 220708B: T193-OHP optical upper limit
  92. Konus-Wind detection of GRB 220708B (Correction to GCN 32358)
  93. Konus-Wind detection of GRB 220708B
  94. GRB 220708B: CALET Gamma-Ray Burst Monitor detection
  95. GRB 220708B: Nanshan/NEXT optical upper limits
  96. GRB 220708A: Swift/UVOT Upper Limits
  97. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  98. GRB 220708A: Swift-XRT refined Analysis
  99. GRB 220706A: Swift/UVOT Upper Limits
  100. GRB 220708B: Swift-XRT afterglow detection

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