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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"

21470 results found.

  1. GRB 220730A: Swift-XRT afterglow detection
  2. GRB 220730A: Swift/UVOT Upper Limits
  3. GRB 220730A: Swift-XRT observations
  4. Swift GRB 220730A: Global MASTER-Net observations report
  5. GRB 220730A: Swift detection of a short hard burst
  6. GRB 220715B: VIRT Optical Upper Limit
  7. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  8. GRB 220715B: Swift-BAT refined analysis
  9. GRB220714B: UVOT detections
  10. GRB 220715B: Fermi GBM detection
  11. GRB 220715B: Swift-XRT refined Analysis
  12. GRB 220715B: Swift/UVOT Upper Limits
  13. GRB 220715B: Enhanced Swift-XRT position
  14. GRB 220715B: BOOTES-network optical upper limits
  15. Swift GRB 220715B: Global MASTER-Net observations report
  16. GRB 220715B: Prompt enhanced Swift-XRT position
  17. GRB 220715B: Swift detection of a burst
  18. GRB 220714B: Swift-BAT refined analysis
  19. GRB 220714B: Fermi GBM observation
  20. GRB 220714B: LCO Optical Observations
  21. GRB 220714B: Swift-XRT refined Analysis
  22. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  23. GRB 220714B: UVOT afterglow discovery
  24. GRB 220714B: Enhanced Swift-XRT position
  25. GRB 220714B: Swift detection of a burst
  26. GRB 220714A: Possible Swift detection of a burst
  27. GRB 220710A: Swift/UVOT Upper Limits
  28. GRB 220711C: Fermi GBM Observation
  29. GRB 220710A: Swift-XRT afterglow detection
  30. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  31. GRB 220711B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  32. GRB 220711B: GIT optical upper limits
  33. GRB 220712B: NOT optical afterglow confirmation
  34. GRB 220710A: Swift ToO observations
  35. GRB 220710A: Swift/BAT-GUANO arcminute localization
  36. GRB 220711B: Swift-BAT refined analysis
  37. IPN triangulation of GRB 220711C (short)
  38. GRB 220711B: Swift-XRT refined Analysis
  39. GRB 220711B: Swift/UVOT Upper Limits
  40. GRB 220711B: Enhanced Swift-XRT position
  41. GRB 220711B: Fermi GBM Detection
  42. GRB 220711B: NOT optical observations
  43. GRB 220711B: LCO Optical Upper Limits
  44. GRB 220711B: Swift detection of a burst
  45. GRB 220708B: GIT optical upper limits
  46. GRB 220708A: Swift-BAT refined analysis
  47. GRB 220708B: T193-OHP optical upper limit
  48. Konus-Wind detection of GRB 220708B
  49. GRB 220708B: CALET Gamma-Ray Burst Monitor detection
  50. GRB 220708B: Nanshan/NEXT optical upper limits
  51. GRB 220708A: Swift/UVOT Upper Limits
  52. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  53. GRB 220708A: Swift-XRT refined Analysis
  54. GRB 220706A: Swift/UVOT Upper Limits
  55. GRB 220708B: Swift-XRT afterglow detection
  56. GRB 220708A: BOOTES-5/JGT early optical upper limit
  57. GRB 220706A: Swift-BAT refined analysis
  58. GRB 220708A: Enhanced Swift-XRT position
  59. GRB 220708B: Swift ToO observations
  60. GRB 220708B: Swift/BAT-GUANO arcminute localization
  61. GRB 220708A: Swift-XRT observations
  62. GRB 220708A: Swift detection of a burst
  63. GRB 220706A: LCO Optical Upper Limits
  64. GRB 220706A: Swift-XRT refined Analysis
  65. GRB 220706A, GROND observations
  66. GRB 220706A: Optical observations from NOT
  67. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  68. GRB 220706A: Nanshan/NEXT optical upper limits
  69. GRB 220706A: Enhanced Swift-XRT position
  70. Swift GRB 220706A: Global MASTER-Net observations report
  71. GRB 220706A: Zadko observatory - Gingin optical observations
  72. GRB 220706A: Prompt enhanced Swift-XRT position
  73. GRB 220706A: Swift detection of a burst
  74. GRB 220701A: Swift-BAT refined analysis
  75. GRB220408A: VIRT Optical Upper Limit
  76. GRB220412A: VIRT Optical Upper Limit
  77. GRB220701A: VIRT Optical Upper Limit
  78. GRB 220701A: MITSuME Akeno optical upper limits
  79. GRB 220701A: COATLI Optical Upper Limit
  80. GRB 220701A: AbAO optical upper limit
  81. GRB 220627A: AstroSat CZTI detection
  82. GRB 220701A: Keck/LRIS Optical Upper Limit
  83. GRB 220701A: Swift-XRT refined Analysis
  84. GRB 220701A: LCO Optical Upper Limits
  85. GRB 220701A: BOOTES-5/JGT early optical upper limit
  86. GRB 220701A: Swift/UVOT Upper Limits
  87. GRB 220701A: Lowell Discovery Telescope Optical Observations
  88. GRB 220701A: Enhanced Swift-XRT position
  89. GRB 200701A: KAIT Optical Upper Limit
  90. GRB 220701A: Swift detection of a burst
  91. GRB 220627A: Swift/UVOT Upper Limits
  92. GRB 220627A: Swift-XRT afterglow detection
  93. Konus-Wind detection of GRB 220627A
  94. Trigger 1113743: Swift detection of MAXI J0655-013
  95. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  96. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  97. GRB 220627A: MeerLICHT candidate optical afterglow
  98. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  99. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  100. Konus-Wind detection of GRB 220624A

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