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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26353 results found.

  1. GRB 180706A: Swift-XRT refined Analysis
  2. GRB 180706A: Enhanced Swift-XRT position
  3. Konus-Wind observation of GRB 180701A
  4. GRB 180705A: TSHAO optical upper limit
  5. GRB 180705A: Swift/UVOT Upper Limits
  6. GRB 180705A: RATIR Optical Observations
  7. GRB 180706A: COATLI Optical Detection
  8. GRB 180706A: Swift detection of a burst with optical counterpart
  9. IPN Triangulation of GRB 180703B
  10. GRB 180705A: Swift-BAT refined analysis
  11. GRB 180705A: Enhanced Swift-XRT position
  12. GRB 180705A: Swift-XRT observations
  13. GRB 180705A: Swift detection of a burst
  14. GRB 180703A: Swift/UVOT Upper Limits
  15. GRB 180703A: Fermi GBM detection
  16. GRB 180704A: Swift-XRT refined Analysis
  17. GRB 180704A: Swift-BAT refined analysis
  18. GRB 180704A: Swift/UVOT Upper Limits
  19. GRB 180703A: LCO Sutherland possible optical candidate
  20. GRB 180703A: Swift-XRT observations
  21. GRB 180704A: Enhanced Swift-XRT position
  22. GRB 180704A: Swift-XRT observations
  23. GRB 180703B: Fermi-LAT detection
  24. GRB 180630A: Swift/UVOT Detection
  25. GRB 180701A: MAXI/GSC detection
  26. GRB 180630A: Swift-BAT refined analysis
  27. GRB 180630A: Swift-XRT refined Analysis
  28. GRB 180630A: Fermi GBM detection
  29. GRB 180630A: Enhanced Swift-XRT position
  30. GRB 180630A: Swift detection of a burst with an optical counterpart
  31. GRB 180626C: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 551697835)
  32. GRB 180626A: TSHAO optical upper limit
  33. Konus-Wind observation of GRB 180626A
  34. GRB 180626A: RATIR Optical Observations
  35. IPN Triangulation of GRB 180626C (short)
  36. IPN Triangulation of GRB 180626B (short)
  37. GRB 180626A: Swift-BAT refined analysis
  38. GRB 180626A: KAIT Optical Upper Limit
  39. GRB 180626A: Swift-XRT refined Analysis
  40. GRB 180626A: COATLI Optical Detection
  41. GRB 180626A: Swift/UVOT Detection
  42. GRB 180626A: RATIR Optical Detection
  43. GRB 180626A: ISON-MN optical observations
  44. GRB 180626A: Enhanced Swift-XRT position
  45. GRB 180626A: A long GRB detected by INTEGRAL
  46. GRB 180626A: Swift detection of a burst with an optical counterpart
  47. GRB 180624A: Swift-BAT refined analysis
  48. AT2018cow: Swift/BAT data search
  49. GRB 180624A: RATIR Optical Observations
  50. GRB 180624A: LBT/MODS redshift measurement
  51. GRB 180613A: LCO Afterglow detection
  52. GRB 180624A: GROND observations
  53. GRB 180624A: LCO Siding Springs afterglow candidate
  54. GRB 180624A: MITSuME Okayama optical upper limits
  55. GRB 180624A: Swift-XRT refined Analysis
  56. GRB 180624A: Swift/UVOT Upper Limits
  57. GRB 180624A: Enhanced Swift-XRT position
  58. GRB 180623A: Swift-BAT refined analysis
  59. GRB 180624A: Swift detection of a burst
  60. GRB 180623A: Swift/UVOT Detection
  61. GRB 180623A: Swift-XRT refined Analysis
  62. GRB 180623A: Enhanced Swift-XRT position
  63. GRB 180623A: Swift detection of a burst
  64. GRB 180620B: Swift/UVOT Detection
  65. GRB 180620A iTelescope observation
  66. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  67. GRB 180620B: Swift-BAT refined analysis
  68. GRB 180613A: Afterglow confirmation and added photometry
  69. GROND observations of GRB 180620B
  70. GROND observations of GRB 180620A
  71. GRB 180620B: Swift-XRT refined Analysis
  72. GRB 180620A: Swift-BAT refined analysis
  73. GRB 180620B: Enhanced Swift-XRT position
  74. GRB 180620B: Fermi GBM detection
  75. GRB 180620A: Xinglong-2.16m optical observations
  76. GRB 180618A: Swift/UVOT Detection
  77. GRB 180618A: TSHAO optical upper limit
  78. GRB 180620A: Swift-XRT refined Analysis
  79. GRB 180620B: Swift detection of a burst with an optical counterpart
  80. GRB 180620A: COATLI Detection and Light Curve
  81. GRB 180620A: Swift/UVOT Detection
  82. GRB 180618A: Xinglong-2.16m optical upper limit
  83. GRB 180620A: LCO McDonald observations
  84. GRB 180620A: Enhanced Swift-XRT position
  85. GRB 180620A: ISON-MN afterglow confirmation
  86. GRB 180620A: RATIR Optical Afterglow Detection
  87. GRB 180620A: Swift detection of a burst with an optical counterpart
  88. GRB 180618A: Swift-BAT refined analysis (a short GRB with extended emission)
  89. GRB 180618A: Swift-XRT refined Analysis
  90. GRB 180618A: Enhanced Swift-XRT position
  91. GRB 180618A: Swift detection of a burst with an optical counterpart
  92. GRB 180614A: AbAO optical observations
  93. GRB 180614A: Swift/UVOT Upper Limits
  94. GRB 180614A: Swift-BAT refined analysis
  95. GRB 180614A: NOT optical upper limits
  96. GRB 180614A: Swift-XRT refined Analysis
  97. GRB 180614A: Enhanced Swift-XRT position
  98. GRB 180614A: Swift detection of a burst
  99. GRB 180613A: Swift/UVOT Upper Limits
  100. GRB 180613A GROND observations

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