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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"

36404 results found.

  1. GRB 220711B: Swift/UVOT Upper Limits
  2. GRB 220711B: Enhanced Swift-XRT position
  3. GRB 220711B: Fermi GBM Detection
  4. GRB 220711B: NOT optical observations
  5. GRB 220711B: LCO Optical Upper Limits
  6. GRB 220711B: Swift detection of a burst
  7. GRB 220711B: Fermi GBM Final Real-time Localization
  8. GRB 220707A: AstroSat CZTI detection
  9. GRB 220708B: GIT optical upper limits
  10. GRB 220711A: Fermi GBM Final Real-time Localization
  11. GRB 220708A: Swift-BAT refined analysis
  12. GRB 220708B: T193-OHP optical upper limit
  13. Konus-Wind detection of GRB 220708B (Correction to GCN 32358)
  14. Konus-Wind detection of GRB 220708B
  15. GRB 220708B: CALET Gamma-Ray Burst Monitor detection
  16. GRB 220708B: Nanshan/NEXT optical upper limits
  17. GRB 220708A: Swift/UVOT Upper Limits
  18. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  19. GRB 220708A: Swift-XRT refined Analysis
  20. GRB 220706A: Swift/UVOT Upper Limits
  21. GRB 220708B: Swift-XRT afterglow detection
  22. GRB 220708A: BOOTES-5/JGT early optical upper limit
  23. GRB 220706A: Swift-BAT refined analysis
  24. GRB 220708A: Enhanced Swift-XRT position
  25. GRB 220708B: Swift ToO observations
  26. GRB 220708B: Swift/BAT-GUANO arcminute localization
  27. GRB 220708A: Swift-XRT observations
  28. GRB 220708A: Swift detection of a burst
  29. GRB 220706A: LCO Optical Upper Limits
  30. GRB 220627A: ATCA detection of radio counterpart
  31. GRB 220706A: Swift-XRT refined Analysis
  32. GRB 220706A, GROND observations
  33. GRB 220706A: Optical observations from NOT
  34. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  35. GRB 220702B: AstroSat CZTI detection
  36. GRB 220706A: Nanshan/NEXT optical upper limits
  37. GRB 220706A: Enhanced Swift-XRT position
  38. Swift GRB 220706A: Global MASTER-Net observations report
  39. GRB 220706A: Zadko observatory - Gingin optical observations
  40. GRB 220706A: Prompt enhanced Swift-XRT position
  41. GRB 220706A: Swift detection of a burst
  42. GRB 220701A: Swift-BAT refined analysis
  43. GRB 220702B: Fermi GBM Final Localization
  44. GRB 220702A: Fermi GBM Final Localization
  45. GRB 220705A: Fermi GBM Final Localization
  46. GRB 220701A: MITSuME Akeno optical upper limits
  47. GRB 220701A: COATLI Optical Upper Limit
  48. GRB 220701A: AbAO optical upper limit
  49. GRB 220627A: AstroSat CZTI detection
  50. GRB 220701A: Keck/LRIS Optical Upper Limit
  51. GRB 220701A: Swift-XRT refined Analysis
  52. GRB 220701A: LCO Optical Upper Limits
  53. GRB 220701A: BOOTES-5/JGT early optical upper limit
  54. GRB 220701A: Swift/UVOT Upper Limits
  55. GRB 220701A: Lowell Discovery Telescope Optical Observations
  56. GRB 220701A: Enhanced Swift-XRT position
  57. GRB 200701A: KAIT Optical Upper Limit
  58. GRB 220701A: Swift detection of a burst
  59. GRB 220627A, GROND observations
  60. GRB 220624A: AGILE/GRID refined analysis
  61. GRB 220627A: Swift/UVOT Upper Limits
  62. GRB 220627A: Swift-XRT afterglow detection
  63. Konus-Wind detection of GRB 220627A
  64. GRB 220627A: VLT MUSE redshift
  65. GRB 220627A: MeerLICHT candidate optical afterglow
  66. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  67. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  68. Konus-Wind detection of GRB 220624A
  69. GRB 220627A: Swift ToO observations
  70. GRB 220627A: Fermi-LAT detection
  71. GRB 220627A: MeerLICHT detection of two afterglow candidates
  72. Fermi GRB 220627A: Global MASTER-Net observations report
  73. GRB 220627A: Fermi GBM Final Real-time Localization
  74. GRB 220623A: GIT optical upper limits.
  75. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  76. GRB 220623A: T193-OHP optical upper limit
  77. GRB 220624A: Fermi GBM Detection
  78. Fermi GRB 220623B: Global MASTER-Net observations report
  79. Fermi GRB 220624A: Global MASTER-Net observations report
  80. IPN triangulation of GRB 220624A
  81. GRB 220623A: Swift-BAT refined analysis
  82. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  83. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  84. GRB 220624A: AGILE/GRID analysis
  85. GRB 220624A: AGILE detection
  86. Konus-Wind detection of GRB 220623A
  87. GRB 220624B: Fermi GBM Final Real-time Localization
  88. GRB 220624A: Fermi GBM Final Real-time Localization
  89. GRB 220623A: AbAO optical upper limit
  90. GRB 220623A: Swift-XRT refined Analysis
  91. GRB 220623A: NOT optical observations
  92. GRB 220623A: Swift/UVOT Upper Limits
  93. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  94. Konus-Wind detection of GRB 220609B
  95. GRB 220623B: Fermi GBM Final Real-time Localization
  96. GRB 220623A: Enhanced Swift-XRT position
  97. GRB 220623A: AGILE detection
  98. GRB 220623A: AstroSat CZTI detection
  99. GRB 220623A: iTelescope optical upper limit
  100. GRB 220623A: Swift-XRT observations

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