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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"

32550 results found.

  1. GRB 220706A, GROND observations
  2. GRB 220706A: Optical observations from NOT
  3. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  4. GRB 220702B: AstroSat CZTI detection
  5. GRB 220706A: Nanshan/NEXT optical upper limits
  6. Swift GRB 220706A: Global MASTER-Net observations report
  7. GRB 220706A: Zadko observatory - Gingin optical observations
  8. GRB 220701A: Swift-BAT refined analysis
  9. GRB220408A: VIRT Optical Upper Limit
  10. GRB220412A: VIRT Optical Upper Limit
  11. GRB220701A: VIRT Optical Upper Limit
  12. GRB 220701A: MITSuME Akeno optical upper limits
  13. GRB 220701A: COATLI Optical Upper Limit
  14. GRB 220701A: AbAO optical upper limit
  15. GRB 220627A: AstroSat CZTI detection
  16. GRB 220701A: Keck/LRIS Optical Upper Limit
  17. GRB 220701A: Swift-XRT refined Analysis
  18. GRB 220701A: LCO Optical Upper Limits
  19. GRB 220701A: Swift/UVOT Upper Limits
  20. GRB 220701A: Lowell Discovery Telescope Optical Observations
  21. GRB 200701A: KAIT Optical Upper Limit
  22. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  23. GRB 220627A, GROND observations
  24. GRB 220624A: AGILE/GRID refined analysis
  25. GRB 220627A: Swift/UVOT Upper Limits
  26. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  27. IceCube-220629A: No significant detection in HAWC
  28. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  29. IceCube-220627A: No significant detection in HAWC
  30. GRB 220627A: Swift-XRT afterglow detection
  31. Konus-Wind detection of GRB 220627A
  32. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  33. GRB 220627A: VLT MUSE redshift
  34. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  35. GRB 220627A: MeerLICHT candidate optical afterglow
  36. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  37. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  38. Konus-Wind detection of GRB 220624A
  39. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  40. GRB 220627A: Swift ToO observations
  41. GRB 220627A: Fermi-LAT detection
  42. GRB 220627A: MeerLICHT detection of two afterglow candidates
  43. Fermi GRB 220627A: Global MASTER-Net observations report
  44. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  45. IceCube-220624A: No significant detection in HAWC
  46. GRB 220623A: GIT optical upper limits.
  47. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  48. GRB 220623A: T193-OHP optical upper limit
  49. IceCube-220624A: No Candidate Counterparts from the Zwicky Transient Facility
  50. GRB 220624A: Fermi GBM Detection
  51. Fermi GRB 220623B: Global MASTER-Net observations report
  52. Fermi GRB 220624A: Global MASTER-Net observations report
  53. IPN triangulation of GRB 220624A
  54. GRB 220623A: Swift-BAT refined analysis
  55. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  56. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  57. GRB 220624A: AGILE/GRID analysis
  58. GRB 220624A: AGILE detection
  59. Konus-Wind detection of GRB 220623A
  60. GRB 220623A: AbAO optical upper limit
  61. GRB 220623A: Swift-XRT refined Analysis
  62. GRB 220623A: NOT optical observations
  63. GRB 220623A: Swift/UVOT Upper Limits
  64. Konus-Wind detection of GRB 220609B
  65. GRB 220623A: AGILE detection
  66. GRB 220623A: AstroSat CZTI detection
  67. GRB 220623A: iTelescope optical upper limit
  68. GRB 220618A: Fermi GBM detection
  69. Swift Detection of MAXI J0655-013
  70. GRB 220618A: Swift-BAT refined analysis
  71. GRB 220618A: iTelescope T-19 upper limit
  72. Konus-Wind detection of GRB 220617A
  73. Fermi GRB 220620B: Global MASTER-Net observations report
  74. Fermi GRB 220620A: Global MASTER-Net observations report
  75. GRB 220611A: Continued Gemini Infrared Observations
  76. GRB 220617A: TNG optical observations
  77. GRB 220617A: Fermi GBM observation
  78. GRB 220611A optical counterpart
  79. GRB 220618A: Swift-XRT refined Analysis
  80. IPN triangulation of GRB 220617A (short)
  81. GRB 220618A: Swift/UVOT Upper Limits
  82. GRB220611A: Gemini Optical Afterglow Confirmation
  83. GRB 220617A: Swift-XRT observations
  84. GRB 220617A: Fermi-LAT detection
  85. GRB 220617B: Swift ToO observations
  86. Fermi GRB 220617A: Global MASTER-Net observations report
  87. GRB 220611A: Gemini Ks counterpart detection
  88. Konus-Wind detection of GRB 220613A
  89. IPN triangulation of GRB 220613A
  90. GRB 220611A: Gemini South Infrared Detection
  91. IPN triangulation of GRB 220606C
  92. GRB 220611A: Swift/UVOT Upper Limits
  93. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  94. GRB 220611A: Swift-BAT refined analysis
  95. Swift GRB 220611A: Global MASTER-Net observations report
  96. GRB 220611A: Swift-XRT refined Analysis
  97. IPN triangulation of GRB 220609B
  98. Fermi GRB 220610A: Global MASTER-Net observations report
  99. GRB 220609B: AstroSat CZTI detection
  100. GRB 220608A: AstroSat CZTI detection

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