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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"

8520 results found.

  1. GRB 180812A: Swift detection of a burst
  2. Swift Trigger 852625: a possible GRB
  3. GRB 180809B: Swift detection of a burst with an optical afterglow
  4. GRB 180809A: Tiled Swift observations
  5. GRB 180806A: NOT optical observations
  6. GRB 180806A: Swift ToO observations
  7. GRB 180805B: Swift detection of a burst
  8. GRB 180805A: Swift detection of a burst
  9. GRB 180728B: MASTER optical observations short GRB IPN error box
  10. GRB 180727A: Swift detection of a burst
  11. GRB 180720B: AMI-LA 15.5 GHz observation
  12. GRB 180720B long follow up requested
  13. GRB 180721A: KAIT Optical Upper Limit
  14. GRB 180723A: CALET Gamma-Ray Burst Monitor detection
  15. GRB 180722A: Tiled Swift observations
  16. ANTARES neutrino Alert180713.02: MASTER optical observation
  17. GRB 180721A: Swift detection of a burst
  18. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  19. GRB 180720B: Fermi GBM observation
  20. GRB 180720B: LCO Haleakala possible bright optical candidate
  21. GRB 180720A: Fermi GBM observation
  22. GRB 180718B: Fermi GBM detection
  23. GRB 180718A: Swift ToO observations
  24. GRB 180718B: Swift ToO observations
  25. GRB 180715A: LCO Sutherland possible optical candidate
  26. GRB 180703A: optical afterglow confirmation
  27. GRB 180709A: Swift detection of a burst
  28. Trigger 846740: Swift trigger near NGC5055
  29. Konus-Wind observation of GRB 180703A
  30. GRB 180706A: Swift detection of a burst with optical counterpart
  31. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  32. GRB 180703A: LCO Sutherland possible optical candidate
  33. GRB 180703A: Tiled Swift observations
  34. GRB 180630A: Swift detection of a burst with an optical counterpart
  35. GRB 180626C: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 551697835)
  36. GRB 180626A: Swift detection of a burst with an optical counterpart
  37. GRB 180624A: GROND observations
  38. GRB 180624A: LCO Siding Springs afterglow candidate
  39. GRB 180624A: Swift detection of a burst
  40. GRB 180623A: Swift detection of a burst
  41. GRB 180618B: CALET Gamma-Ray Burst Monitor detection
  42. GRB 180620B: Swift detection of a burst with an optical counterpart
  43. GRB 180620A: ISON-MN afterglow confirmation
  44. GRB 180620A: Swift detection of a burst with an optical counterpart
  45. GRB 180618A: Swift detection of a burst with an optical counterpart
  46. GRB 180614A: Swift detection of a burst
  47. GRB 180613A: Possible IR afterglow
  48. GRB 180613A: Swift detection of a burst
  49. GRB 180602A: Swift detection of a burst
  50. Swift Trigger 834937 is not a GRB
  51. GRB 180514A: CrAO/ZTSH optical observations and afterglow candidate
  52. GRB 180514A: Swift detection of a burst
  53. GRB 180510B: GROND detection in all bands
  54. GRB 180510B: Swift detection of a burst with an optical counterpart
  55. GRB 180510A: Swift detection of a burst
  56. GRB 180427A: AstroSat CZTI detection
  57. GRB 180504A: ePESSTO NTT NIR observations
  58. GRB 180504A: NOT afterglow candidate
  59. GRB 180504A: Swift detection of a burst
  60. GRB 180427A: Fermi GBM detection
  61. GRB 180425A: Swift detection of a burst
  62. Retraction of IceCube GCN/AMON NOTICE 71165249_130949
  63. GRB 180418A GROND observations
  64. GRB 180418A: Gemini-North imaging and spectroscopy
  65. GRB 180418A: Swift-BAT refined analysis
  66. GRB 180418A: Fermi GBM observation
  67. LIGO/Virgo G299232: LOFAR follow-up
  68. GRB 180418A: KAIT Optical Afterglow Candidate
  69. GRB 180410A: Swift detection of a burst or a Galactic transient.
  70. GRB 180409A: Tiled Swift observations
  71. GRB 180404B: Swift detection of a burst with an optical counterpart
  72. GRB 180404A: Swift detection of a burst with an optical afterglow
  73. GRB 180402A: KAIT Optical Upper Limit
  74. GRB 180402A: Swift detection of a possibly short burst
  75. GRB 180331B: Swift detection of a burst
  76. GRB 180331A: Swift detection of a burst
  77. Swift Trigger 819863 is not a GRB
  78. GRB 180329B: Swift detection of a burst with an optical afterglow
  79. GRB 180325A: Swift detection of a burst with an optical counterpart
  80. GRB 180324A: KAIT Optical Upper Limit
  81. GRB 180324A: Swift detection of a burst
  82. GRB 180316A: Swift detection of a burst
  83. GRB 180314B: Swift detection of a burst
  84. GRB 180314A: TAROT La Silla observatory optical observations
  85. GRB 180314A: Swift detection of a burst with an optical counterpart
  86. GRB 180311A: Swift detection of a burst
  87. GRB 180305A: Mondy optical observations
  88. GRB 180305A: RATIR Optical Afterglow Candidate
  89. GRB 180305A: Swift ToO observations
  90. Swift Trigger 811686 is probably not an astrophysical source.
  91. GRB 180224A: Swift-BAT refined analysis
  92. GRB 180224A: Swift detection of a burst with an optical counterpart
  93. GRB 180222A: Swift detection of a burst
  94. Swift trigger 811074 (possible GRB 180221A): Swift refined analysis
  95. GRB 180210A: Tiled Swift observations
  96. GRB 180210A: Swift ToO observations
  97. Trigger 809374: Swift detection of a possible non-burst faint source
  98. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  99. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  100. GRB 180204A: Swift detection of a short burst

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