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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"

28111 results found.

  1. GRB 180626A: ISON-MN optical observations
  2. GRB 180626A: Enhanced Swift-XRT position
  3. GRB 180626A: A long GRB detected by INTEGRAL
  4. GRB 180626A: Swift detection of a burst with an optical counterpart
  5. GRB 180624A: Swift-BAT refined analysis
  6. AT2018cow: Swift/BAT data search
  7. GRB 180624A: RATIR Optical Observations
  8. GRB 180624A: LBT/MODS redshift measurement
  9. GRB 180613A: LCO Afterglow detection
  10. GRB 180624A: GROND observations
  11. GRB 180624A: LCO Siding Springs afterglow candidate
  12. GRB 180624A: MITSuME Okayama optical upper limits
  13. GRB 180624A: Swift-XRT refined Analysis
  14. GRB 180624A: Swift/UVOT Upper Limits
  15. GRB 180624A: Enhanced Swift-XRT position
  16. GRB 180623A: Swift-BAT refined analysis
  17. GRB 180624A: Swift detection of a burst
  18. GRB 180623A: Swift/UVOT Detection
  19. GRB 180623A: Swift-XRT refined Analysis
  20. GRB 180623A: Enhanced Swift-XRT position
  21. GRB 180623A: Swift detection of a burst
  22. GRB 180620B: Swift/UVOT Detection
  23. GRB 180620A iTelescope observation
  24. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  25. GRB 180620B: Swift-BAT refined analysis
  26. GRB 180613A: Afterglow confirmation and added photometry
  27. GROND observations of GRB 180620B
  28. GROND observations of GRB 180620A
  29. GRB 180620B: Swift-XRT refined Analysis
  30. GRB 180620A: Swift-BAT refined analysis
  31. GRB 180620B: Enhanced Swift-XRT position
  32. GRB 180620B: Fermi GBM detection
  33. GRB 180620A: Xinglong-2.16m optical observations
  34. GRB 180618A: Swift/UVOT Detection
  35. GRB 180618A: TSHAO optical upper limit
  36. GRB 180620A: Swift-XRT refined Analysis
  37. GRB 180620B: Swift detection of a burst with an optical counterpart
  38. GRB 180620A: COATLI Detection and Light Curve
  39. GRB 180620A: Swift/UVOT Detection
  40. GRB 180618A: Xinglong-2.16m optical upper limit
  41. GRB 180620A: LCO McDonald observations
  42. GRB 180620A: Enhanced Swift-XRT position
  43. GRB 180620A: ISON-MN afterglow confirmation
  44. GRB 180620A: RATIR Optical Afterglow Detection
  45. GRB 180620A: Swift detection of a burst with an optical counterpart
  46. GRB 180618A: Swift-BAT refined analysis (a short GRB with extended emission)
  47. GRB 180618A: Swift-XRT refined Analysis
  48. GRB 180618A: Enhanced Swift-XRT position
  49. GRB 180618A: Swift detection of a burst with an optical counterpart
  50. GRB 180614A: AbAO optical observations
  51. GRB 180614A: Swift/UVOT Upper Limits
  52. GRB 180614A: Swift-BAT refined analysis
  53. GRB 180614A: NOT optical upper limits
  54. GRB 180614A: Swift-XRT refined Analysis
  55. GRB 180614A: Enhanced Swift-XRT position
  56. GRB 180614A: Swift detection of a burst
  57. GRB 180613A: Swift/UVOT Upper Limits
  58. GRB 180613A GROND observations
  59. GRB 180613A: Possible IR afterglow
  60. GRB 180613A: Swift-XRT refined Analysis
  61. GRB 180613A: Enhanced Swift-XRT position
  62. GRB 180613A: Possible host galaxy at XRT position, or star
  63. GRB 180613A: Swift detection of a burst
  64. GRB 180611A: Fermi GBM observation
  65. GRB 180605A: Fermi GBM observation
  66. GW170817/GRB170817A: LBT optical detection
  67. GRB 180602B: Fermi GBM detection
  68. GRB 180602A: Swift/UVOT Upper Limits
  69. GRB 180602A: MITSuME Akeno optical upper limits
  70. GRB 180602A: Swift-XRT refined Analysis
  71. GRB 180602A: Swift-BAT refined analysis
  72. GRB 180602A: MITSuME Okayama optical upper limits
  73. GRB 180602A: Enhanced Swift-XRT position
  74. GRB 180602A: Swift detection of a burst
  75. IPN Triangulation of GRB 180529A (short/hard)
  76. Swift Trigger 834937 is not a GRB
  77. IPN Triangulation of GRB 180526A (long)
  78. IPN Triangulation of GRB 180523A
  79. GRB180523B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 548793993)
  80. GRB 180514A: CrAO/ZTSH optical observations and afterglow candidate
  81. GRB 180514A: Swift/UVOT Upper Limits
  82. GRB 180514A: Detection limits from 2.5m NOT
  83. GRB 180510A: MITSuME Ishigakijima optical upper limits
  84. GRB 180514A: 1.5m OSN optical observations
  85. GRB 180514A: GOTO Optical Observations
  86. GRB 180514A: Swift-BAT refined analysis
  87. GRB 180514A: Swift-XRT refined Analysis
  88. GRB 180514A: Enhanced Swift-XRT position
  89. GRB 180512A: VLT/HAWK-I NIR Observations
  90. GRB 180514A: Swift detection of a burst
  91. Konus-Wind observation of GRB 180510A
  92. GRB 180512A: Swift-XRT refined Analysis
  93. GRB 180512A: Swift-BAT refined analysis
  94. GRB 180512A: RATIR Optical Observations
  95. GRB 180512A: LBT optical detection
  96. GRB 180512A: Swift/UVOT Upper Limits
  97. GRB 180512A: Enhanced Swift-XRT position
  98. GRB 180512A: GROND upper limits
  99. GRB 180512A: NOT upper limits
  100. GRB 180512A: OASDG optical observations

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