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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"

21525 results found.

  1. GRB 220708A: Swift-BAT refined analysis
  2. GRB 220708B: T193-OHP optical upper limit
  3. Konus-Wind detection of GRB 220708B
  4. GRB 220708B: CALET Gamma-Ray Burst Monitor detection
  5. GRB 220708B: Nanshan/NEXT optical upper limits
  6. GRB 220708A: Swift/UVOT Upper Limits
  7. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  8. GRB 220708A: Swift-XRT refined Analysis
  9. GRB 220706A: Swift/UVOT Upper Limits
  10. GRB 220708B: Swift-XRT afterglow detection
  11. GRB 220708A: BOOTES-5/JGT early optical upper limit
  12. GRB 220706A: Swift-BAT refined analysis
  13. GRB 220708A: Enhanced Swift-XRT position
  14. GRB 220708B: Swift ToO observations
  15. GRB 220708B: Swift/BAT-GUANO arcminute localization
  16. GRB 220708A: Swift-XRT observations
  17. GRB 220708A: Swift detection of a burst
  18. GRB 220706A: LCO Optical Upper Limits
  19. GRB 220706A: Swift-XRT refined Analysis
  20. GRB 220706A, GROND observations
  21. GRB 220706A: Optical observations from NOT
  22. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  23. GRB 220706A: Nanshan/NEXT optical upper limits
  24. GRB 220706A: Enhanced Swift-XRT position
  25. Swift GRB 220706A: Global MASTER-Net observations report
  26. GRB 220706A: Zadko observatory - Gingin optical observations
  27. GRB 220706A: Prompt enhanced Swift-XRT position
  28. GRB 220706A: Swift detection of a burst
  29. GRB 220701A: Swift-BAT refined analysis
  30. GRB220408A: VIRT Optical Upper Limit
  31. GRB220412A: VIRT Optical Upper Limit
  32. GRB220701A: VIRT Optical Upper Limit
  33. GRB 220701A: MITSuME Akeno optical upper limits
  34. GRB 220701A: COATLI Optical Upper Limit
  35. GRB 220701A: AbAO optical upper limit
  36. GRB 220627A: AstroSat CZTI detection
  37. GRB 220701A: Keck/LRIS Optical Upper Limit
  38. GRB 220701A: Swift-XRT refined Analysis
  39. GRB 220701A: LCO Optical Upper Limits
  40. GRB 220701A: BOOTES-5/JGT early optical upper limit
  41. GRB 220701A: Swift/UVOT Upper Limits
  42. GRB 220701A: Lowell Discovery Telescope Optical Observations
  43. GRB 220701A: Enhanced Swift-XRT position
  44. GRB 200701A: KAIT Optical Upper Limit
  45. GRB 220701A: Swift detection of a burst
  46. GRB 220627A: Swift/UVOT Upper Limits
  47. GRB 220627A: Swift-XRT afterglow detection
  48. Konus-Wind detection of GRB 220627A
  49. Trigger 1113743: Swift detection of MAXI J0655-013
  50. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  51. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  52. GRB 220627A: MeerLICHT candidate optical afterglow
  53. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  54. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  55. Konus-Wind detection of GRB 220624A
  56. GRB 220627A: Swift ToO observations
  57. GRB 220627A: Fermi-LAT detection
  58. GRB 220623A: GIT optical upper limits.
  59. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  60. GRB 220623A: T193-OHP optical upper limit
  61. GRB 220624A: Fermi GBM Detection
  62. IPN triangulation of GRB 220624A
  63. GRB 220623A: Swift-BAT refined analysis
  64. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  65. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  66. Konus-Wind detection of GRB 220623A
  67. GRB 220623A: AbAO optical upper limit
  68. GRB 220623A: Swift-XRT refined Analysis
  69. GRB 220623A: NOT optical observations
  70. GRB 220623A: Swift/UVOT Upper Limits
  71. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  72. GRB 220623A: Enhanced Swift-XRT position
  73. GRB 220623A: AGILE detection
  74. GRB 220623A: AstroSat CZTI detection
  75. GRB 220623A: iTelescope optical upper limit
  76. GRB 220623A: Swift-XRT observations
  77. GRB 220623A: Swift detection of a burst
  78. GRB 220618A: Fermi GBM detection
  79. Swift Detection of MAXI J0655-013
  80. GRB 220618A: Swift-BAT refined analysis
  81. GRB 220618A: iTelescope T-19 upper limit
  82. Swift GRB220620.02: Global MASTER-Net observations report
  83. GRB 220611A: Continued Gemini Infrared Observations
  84. GRB 220617A: TNG optical observations
  85. Swift Trigger 1110865 is probably not an astrophysical event
  86. GRB 220618A: Swift-XRT refined Analysis
  87. IPN triangulation of GRB 220617A (short)
  88. GRB 220618A: BOOTES-5/JGT early optical upper limit
  89. GRB 220618A: Swift/UVOT Upper Limits
  90. GRB 220618A: Enhanced Swift-XRT position
  91. GRB 220617A: Swift-XRT observations
  92. GRB 220618A: Swift detection of a burst
  93. Swift GRB220618.38: Global MASTER-Net observations report
  94. GRB 220617A: Fermi-LAT detection
  95. GRB 220617B: Swift ToO observations
  96. GRB 220611A: Gemini South Infrared Detection
  97. GRB 220611A: Swift/UVOT Upper Limits
  98. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  99. GRB 220612A: Swift/BAT-GUANO detection
  100. GRB 220611A: Swift-BAT refined analysis

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