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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"

27919 results found.

  1. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  2. Konus-Wind detection of GRB 220711C
  3. GRB 220711B: GIT optical upper limits
  4. GRB 220710A: Swift ToO observations
  5. GRB 220710A: Swift/BAT-GUANO arcminute localization
  6. GRB 220711B: Swift-BAT refined analysis
  7. IPN triangulation of GRB 220711C (short)
  8. GRB 220711B: Swift-XRT refined Analysis
  9. GRB 220711B: Swift/UVOT Upper Limits
  10. GRB 220711B: Enhanced Swift-XRT position
  11. GRB 220711B: Fermi GBM Detection
  12. GRB 220711B: LCO Optical Upper Limits
  13. GRB 220711B: Swift detection of a burst
  14. GRB 220711B: Fermi GBM Final Real-time Localization
  15. GRB 220707A: AstroSat CZTI detection
  16. GRB 220708B: GIT optical upper limits
  17. GRB 220711A: Fermi GBM Final Real-time Localization
  18. GRB 220708A: Swift-BAT refined analysis
  19. Konus-Wind detection of GRB 220708B (Correction to GCN 32358)
  20. Konus-Wind detection of GRB 220708B
  21. GRB 220708B: CALET Gamma-Ray Burst Monitor detection
  22. GRB 220708B: Nanshan/NEXT optical upper limits
  23. GRB 220708A: Swift/UVOT Upper Limits
  24. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  25. GRB 220708A: Swift-XRT refined Analysis
  26. GRB 220706A: Swift/UVOT Upper Limits
  27. GRB 220708B: Swift-XRT afterglow detection
  28. GRB 220708A: BOOTES-5/JGT early optical upper limit
  29. GRB 220706A: Swift-BAT refined analysis
  30. GRB 220708A: Enhanced Swift-XRT position
  31. GRB 220708B: Swift ToO observations
  32. GRB 220708B: Swift/BAT-GUANO arcminute localization
  33. GRB 220708A: Swift-XRT observations
  34. GRB 220708A: Swift detection of a burst
  35. GRB 220706A: LCO Optical Upper Limits
  36. GRB 220627A: ATCA detection of radio counterpart
  37. GRB 220706A: Swift-XRT refined Analysis
  38. GRB 220706A, GROND observations
  39. GRB 220706A: Optical observations from NOT
  40. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  41. GRB 220702B: AstroSat CZTI detection
  42. GRB 220706A: Nanshan/NEXT optical upper limits
  43. GRB 220706A: Enhanced Swift-XRT position
  44. Swift GRB 220706A: Global MASTER-Net observations report
  45. GRB 220706A: Zadko observatory - Gingin optical observations
  46. GRB 220706A: Prompt enhanced Swift-XRT position
  47. GRB 220706A: Swift detection of a burst
  48. GRB 220701A: Swift-BAT refined analysis
  49. GRB 220702B: Fermi GBM Final Localization
  50. GRB 220702A: Fermi GBM Final Localization
  51. GRB 220705A: Fermi GBM Final Localization
  52. GRB 220701A: MITSuME Akeno optical upper limits
  53. GRB 220701A: AbAO optical upper limit
  54. GRB 220627A: AstroSat CZTI detection
  55. GRB 220701A: Swift-XRT refined Analysis
  56. GRB 220701A: LCO Optical Upper Limits
  57. GRB 220701A: BOOTES-5/JGT early optical upper limit
  58. GRB 220701A: Swift/UVOT Upper Limits
  59. GRB 220701A: Enhanced Swift-XRT position
  60. GRB 200701A: KAIT Optical Upper Limit
  61. GRB 220701A: Swift detection of a burst
  62. GRB 220624A: AGILE/GRID refined analysis
  63. GRB 220627A: Swift/UVOT Upper Limits
  64. IceCube-220629A: No significant detection in HAWC
  65. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  66. IceCube-220627A: No significant detection in HAWC
  67. GRB 220627A: Swift-XRT afterglow detection
  68. Konus-Wind detection of GRB 220627A
  69. Trigger 1113743: Swift detection of MAXI J0655-013
  70. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  71. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  72. GRB 220627A: MeerLICHT candidate optical afterglow
  73. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  74. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  75. Konus-Wind detection of GRB 220624A
  76. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  77. GRB 220627A: Swift ToO observations
  78. GRB 220627A: Fermi-LAT detection
  79. GRB 220627A: MeerLICHT detection of two afterglow candidates
  80. GRB 220627A: Fermi GBM Final Real-time Localization
  81. IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event
  82. IceCube-220624A: No significant detection in HAWC
  83. GRB 220623A: GIT optical upper limits.
  84. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  85. GRB 220624A: Fermi GBM Detection
  86. IPN triangulation of GRB 220624A
  87. GRB 220623A: Swift-BAT refined analysis
  88. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  89. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  90. GRB 220624A: AGILE/GRID analysis
  91. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  92. GRB 220624A: AGILE detection
  93. Konus-Wind detection of GRB 220623A
  94. GRB 220624B: Fermi GBM Final Real-time Localization
  95. GRB 220624A: Fermi GBM Final Real-time Localization
  96. GRB 220623A: AbAO optical upper limit
  97. GRB 220623A: Swift-XRT refined Analysis
  98. GRB 220623A: Swift/UVOT Upper Limits
  99. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  100. Konus-Wind detection of GRB 220609B

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