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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"

19663 results found.

  1. GRB 220715B: Swift detection of a burst
  2. GRB 220714B: Swift-BAT refined analysis
  3. GRB 220714B: Fermi GBM observation
  4. GRB 220714B: LCO Optical Observations
  5. GRB 220714B: Swift-XRT refined Analysis
  6. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  7. GRB 220714B: UVOT afterglow discovery
  8. GRB 220714B: Enhanced Swift-XRT position
  9. GRB 220714B: Swift detection of a burst
  10. GRB 220714A: Possible Swift detection of a burst
  11. GRB 220710A: Swift/UVOT Upper Limits
  12. GRB 220711C: Fermi GBM Observation
  13. GRB 220710A: Swift-XRT afterglow detection
  14. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  15. GRB 220711B: GIT optical upper limits
  16. GRB 220710A: Swift ToO observations
  17. GRB 220710A: Swift/BAT-GUANO arcminute localization
  18. GRB 220711B: Swift-BAT refined analysis
  19. IPN triangulation of GRB 220711C (short)
  20. GRB 220711B: Swift-XRT refined Analysis
  21. GRB 220711B: Swift/UVOT Upper Limits
  22. GRB 220711B: Enhanced Swift-XRT position
  23. GRB 220711B: Fermi GBM Detection
  24. GRB 220711B: LCO Optical Upper Limits
  25. GRB 220711B: Swift detection of a burst
  26. GRB 220708B: GIT optical upper limits
  27. GRB 220708A: Swift-BAT refined analysis
  28. Konus-Wind detection of GRB 220708B
  29. GRB 220708B: CALET Gamma-Ray Burst Monitor detection
  30. GRB 220708B: Nanshan/NEXT optical upper limits
  31. GRB 220708A: Swift/UVOT Upper Limits
  32. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  33. GRB 220708A: Swift-XRT refined Analysis
  34. GRB 220706A: Swift/UVOT Upper Limits
  35. GRB 220708B: Swift-XRT afterglow detection
  36. GRB 220708A: BOOTES-5/JGT early optical upper limit
  37. GRB 220706A: Swift-BAT refined analysis
  38. GRB 220708A: Enhanced Swift-XRT position
  39. GRB 220708B: Swift ToO observations
  40. GRB 220708B: Swift/BAT-GUANO arcminute localization
  41. GRB 220708A: Swift-XRT observations
  42. GRB 220708A: Swift detection of a burst
  43. GRB 220706A: LCO Optical Upper Limits
  44. GRB 220706A: Swift-XRT refined Analysis
  45. GRB 220706A, GROND observations
  46. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  47. GRB 220706A: Nanshan/NEXT optical upper limits
  48. GRB 220706A: Enhanced Swift-XRT position
  49. Swift GRB 220706A: Global MASTER-Net observations report
  50. GRB 220706A: Zadko observatory - Gingin optical observations
  51. GRB 220706A: Prompt enhanced Swift-XRT position
  52. GRB 220706A: Swift detection of a burst
  53. GRB 220701A: Swift-BAT refined analysis
  54. GRB 220701A: MITSuME Akeno optical upper limits
  55. GRB 220701A: AbAO optical upper limit
  56. GRB 220627A: AstroSat CZTI detection
  57. GRB 220701A: Swift-XRT refined Analysis
  58. GRB 220701A: LCO Optical Upper Limits
  59. GRB 220701A: BOOTES-5/JGT early optical upper limit
  60. GRB 220701A: Swift/UVOT Upper Limits
  61. GRB 220701A: Enhanced Swift-XRT position
  62. GRB 200701A: KAIT Optical Upper Limit
  63. GRB 220701A: Swift detection of a burst
  64. GRB 220627A: Swift/UVOT Upper Limits
  65. GRB 220627A: Swift-XRT afterglow detection
  66. Konus-Wind detection of GRB 220627A
  67. Trigger 1113743: Swift detection of MAXI J0655-013
  68. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  69. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  70. GRB 220627A: MeerLICHT candidate optical afterglow
  71. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  72. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  73. Konus-Wind detection of GRB 220624A
  74. GRB 220627A: Swift ToO observations
  75. GRB 220627A: Fermi-LAT detection
  76. GRB 220623A: GIT optical upper limits.
  77. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  78. GRB 220624A: Fermi GBM Detection
  79. IPN triangulation of GRB 220624A
  80. GRB 220623A: Swift-BAT refined analysis
  81. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  82. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  83. Konus-Wind detection of GRB 220623A
  84. GRB 220623A: AbAO optical upper limit
  85. GRB 220623A: Swift-XRT refined Analysis
  86. GRB 220623A: Swift/UVOT Upper Limits
  87. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  88. GRB 220623A: Enhanced Swift-XRT position
  89. GRB 220623A: AGILE detection
  90. GRB 220623A: AstroSat CZTI detection
  91. GRB 220623A: Swift-XRT observations
  92. GRB 220623A: Swift detection of a burst
  93. GRB 220618A: Fermi GBM detection
  94. Swift Detection of MAXI J0655-013
  95. GRB 220618A: Swift-BAT refined analysis
  96. GRB 220618A: iTelescope T-19 upper limit
  97. Swift GRB220620.02: Global MASTER-Net observations report
  98. GRB 220611A: Continued Gemini Infrared Observations
  99. GRB 220617A: TNG optical observations
  100. Swift Trigger 1110865 is probably not an astrophysical event

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