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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 180624A: LBT/MODS redshift measurement
  2. GRB 180620B: AstroSat CZTI detection
  3. GRB 180620A: AstroSat CZTI detection
  4. GRB 180618A: AstroSat CZTI detection
  5. GRB 180624A: GROND observations
  6. GRB 180624A: LCO Siding Springs afterglow candidate
  7. GRB 180624A: Swift-XRT refined Analysis
  8. GRB 180624A: Swift/UVOT Upper Limits
  9. GRB 180624A: Enhanced Swift-XRT position
  10. GRB 180623A: retraction of the Swift/UVOT Detection
  11. GRB 180623A: Swift-BAT refined analysis
  12. GRB 180624A: Swift detection of a burst
  13. GRB 180623A: Swift/UVOT Detection
  14. GRB 180623A: Swift-XRT refined Analysis
  15. GRB 180623A: Enhanced Swift-XRT position
  16. GRB 180623A: Swift detection of a burst
  17. GRB 180620B: Swift/UVOT Detection
  18. GRB 180620A iTelescope observation
  19. Konus-Wind observation of GRB 180620B
  20. Konus-Wind observation of GRB 180620A
  21. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  22. GRB 180620B: Swift-BAT refined analysis
  23. GROND observations of GRB 180620B
  24. GROND observations of GRB 180620A
  25. GRB 180620B: Swift-XRT refined Analysis
  26. GRB 180620A: Swift-BAT refined analysis
  27. GRB 180620B: Enhanced Swift-XRT position
  28. GRB 180620B: Fermi GBM detection
  29. GRB 180620A: KAIT Optical Observations
  30. GRB 180618A: Swift/UVOT Detection
  31. GRB 180620A: Swift-XRT refined Analysis
  32. GRB 180620B: Swift detection of a burst with an optical counterpart
  33. GRB 180620A: Swift/UVOT Detection
  34. GRB 180620A: LCO McDonald observations
  35. GRB 180620A: Enhanced Swift-XRT position
  36. GRB 180620A: MASTER OT observation
  37. GRB 180620A: ISON-MN afterglow confirmation
  38. GRB 180620A: RATIR Optical Afterglow Detection
  39. GRB 180620A: Swift detection of a burst with an optical counterpart
  40. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  41. GRB 180618A: Swift-BAT refined analysis (a short GRB with extended emission)
  42. GRB 180618A: Fermi GBM detection
  43. GRB 180618A: Swift-XRT refined Analysis
  44. GRB 180618A: LT prompt observations
  45. GRB 180618A: Enhanced Swift-XRT position
  46. GRB 180618A: Swift detection of a burst with an optical counterpart
  47. GRB 180614A: 1.5m OSN I-band observation
  48. GRB 180614A: Swift/UVOT Upper Limits
  49. GRB 180614A: Swift-BAT refined analysis
  50. GRB 180614A: NOT optical upper limits
  51. GRB 180614A: MASTER observation
  52. GRB 180614A: Swift-XRT refined Analysis
  53. GRB 180614A: Enhanced Swift-XRT position
  54. GRB 180614A: Swift detection of a burst
  55. GRB 180613A: Swift/UVOT Upper Limits
  56. GRB 180613A GROND observations: correction
  57. GRB 180613A GROND observations
  58. GRB 180613A, Swift-BAT refined analysis
  59. GRB 180613A: Swift-XRT refined Analysis
  60. GRB 180613A: Enhanced Swift-XRT position
  61. GRB 180613A: Prompt enhanced Swift-XRT position
  62. GRB 180613A: Swift detection of a burst
  63. GRB 180602A: Swift/UVOT Upper Limits
  64. GRB 180602A: Swift-XRT refined Analysis
  65. GRB 180602A: Swift-BAT refined analysis
  66. GRB 180602A: Enhanced Swift-XRT position
  67. GRB 180602A: Swift detection of a burst
  68. IPN Triangulation of GRB 180529A (short/hard)
  69. Swift Trigger 834937 is not a GRB
  70. IPN Triangulation of GRB 180523A
  71. GRB 180514A: Swift/UVOT Upper Limits
  72. GRB 180510A: MITSuME Ishigakijima optical upper limits
  73. GRB 180514A: Swift-BAT refined analysis
  74. GRB 180514A: Swift-XRT refined Analysis
  75. GRB 180514A: Enhanced Swift-XRT position
  76. GRB 180512A: VLT/HAWK-I NIR Observations
  77. GRB 180514A: Swift detection of a burst
  78. Konus-Wind observation of GRB 180510A
  79. GRB 180512A: Swift-XRT refined Analysis
  80. GRB 180512A: Swift-BAT refined analysis
  81. GRB 180512A: RATIR Optical Observations
  82. GRB 180512A: LBT optical detection
  83. GRB 180512A: Swift/UVOT Upper Limits
  84. GRB 180512A: LT prompt observations
  85. GRB 180512A: Enhanced Swift-XRT position
  86. GRB 180512A: GROND upper limits
  87. GRB 180512A: NOT upper limits
  88. GRB 180512A: OASDG optical observations
  89. GRB 180512A: Upper limits from OSN
  90. GRB 180512A: Swift detection of a burst
  91. GRB 180510A: Swift/UVOT followup observations
  92. GRB 180510B: Swift-XRT refined Analysis
  93. GRB 180510A: Swift-XRT refined Analysis
  94. Swift trigger 831888: misidentification of 4U 1416-62
  95. GRB 180510B: Swift-BAT refined analysis
  96. GRB 180510B: GROND detection in all bands
  97. GRB 180510B: TAROT La Silla observatory optical observations
  98. Swift Trigger 831888: a possible GRB or Galactic transient
  99. GRB 180510B: Enhanced Swift-XRT position
  100. GRB 180510B: Swift detection of a burst with an optical counterpart

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