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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"

37740 results found.

  1. GRB 180314A: LCO Siding Springs observations
  2. GRB 180314A: Swift-XRT refined Analysis
  3. GRB 180314A: Fermi GBM observation
  4. GRB 180314A: VLT/X-shooter redshift
  5. GRB 180314A: Swift/UVOT Detection
  6. GRB 180314A: REM optical/NIR observations
  7. GRB 180314A: MASTER-Net OT dtetction
  8. GRB 180314A: Enhanced Swift-XRT position
  9. GRB180314A: GROND detection of the afterglow
  10. GRB 180314A: Swift detection of a burst with an optical counterpart
  11. GRB 180305A: AstroSat CZTI detection
  12. GRB 180311A: Swift/UVOT Upper Limits
  13. GRB 180311A, Swift-BAT refined analysis
  14. GRB 180311A: Swift-XRT refined Analysis
  15. Swift detection of MAXI J1820+070
  16. GRB 180311A: Enhanced Swift-XRT position
  17. GRB 180311A: Prompt enhanced Swift-XRT position
  18. GRB 180311A: Swift detection of a burst
  19. GRB 180305A CALET Gamma-Ray Burst Monitor detection
  20. GRB 180305A: RATIR Optical Observations
  21. GRB 180305A: Swift/UVOT Upper Limits
  22. GRB 180305A: Mondy optical observations
  23. GRB 180305A: Swift-XRT afterglow detection
  24. Konus-Wind observation of GRB 180305A
  25. GRB 180305A: RATIR Optical Afterglow Candidate
  26. GRB 180305A: Swift ToO observations
  27. GRB 180305A: Fermi GBM detection
  28. GRB 180305A: Fermi-LAT detection
  29. GRB 180221B: Insight-HXMT/HE observation
  30. Fermi GBM trigger 541402602/180227234 is not a GRB
  31. GRB 180224A: Swift/UVOT Detection
  32. Konus-Wind observation of GRB 180223A
  33. GRB 180224A: OASDG optical observations
  34. IPN Triangulation of GRB 180223A (long)
  35. GRB 180210A: Insight-HXMT/HE observation
  36. GRB 180224A: AbAO optical observations
  37. GRB 180224A: Swift-BAT refined analysis
  38. GRB 180224A: RATIR Optical Observations
  39. GRB 180224A: Swift-XRT refined Analysis
  40. GRB 180224A: Enhanced Swift-XRT position
  41. GRB 180224A: Swift detection of a burst with an optical counterpart
  42. GRB 180218A: AstroSat CZTI detection
  43. MAXI J1813-095 source: AbAO optical observations
  44. GRB 180222A: Swift/UVOT Upper Limits
  45. GRB 180221B CALET Gamma-Ray Burst Monitor detection
  46. GRB 180222A: Swift-XRT refined Analysis
  47. GRB 180222A: Swift-BAT refined analysis
  48. GRB 180222A: Enhanced Swift-XRT position
  49. GRB 180222A: A long GRB detected by INTEGRAL
  50. GRB 180222A: Swift detection of a burst
  51. Swift trigger 811074 (possible GRB 180221A): Swift refined analysis
  52. GRB 180205A: Mondy optical observations
  53. GRB 180219A CALET Gamma-Ray Burst Monitor detection
  54. GRB180221A: MASTER-OAFA optical observations
  55. Swift Trigger 811074: possible GRB 180221A
  56. Konus-Wind observation of GRB 180218A
  57. GRB 180218A CALET Gamma-Ray Burst Monitor detection
  58. GRB 180218A: Fermi GBM Detection
  59. IPN Triangulation of GRB 180218A (long/bright)
  60. GRB 180204A: 15 GHz upper limits from AMI
  61. GRB 180112A: AstroSat CZTI detection
  62. Fermi GBM triggers 540405116/180215689 and 540476225/180216512 are not a GRBs
  63. Konus-Wind observation of GRB 180210A
  64. GRB 180205A: SEDM Observations
  65. GRB 180210A: Swift-XRT afterglow detection
  66. GRB 180210A: Tiled Swift observations
  67. GRB 180205A: BAO optical observations
  68. GRB 180210A: Swift ToO observations
  69. GRB 180210A: Fermi-LAT detection
  70. GRB 180210A: Fermi GBM detection
  71. Trigger 809217: Swift trigger on RS CVn Star HD 8357
  72. GRB180205A: Optical observations with DOAO 1m telescope
  73. GRB 180205A: AbAO optical observations
  74. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  75. GRB 180205A optical observations
  76. GRB 180202A: Insight-HXMT/HE detection
  77. GRB 180204A: MITSuME Okayama optical upper limits
  78. GRB 180205A: confirmation of Swift-BAT trigger time.
  79. GRB 180205A: Optical observations
  80. GRB 180205A: Swift/UVOT Detection
  81. GRB 180205A: Nanshan-1m optical observations
  82. GRB 180205A: Swift-XRT refined Analysis
  83. GRB 180205A: Swift-BAT refined analysis
  84. GRB 180205A: Xinglong TNT optical observation
  85. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  86. GRB 180205A: Nickel telescope optical observations
  87. GRB 180205A: VLT polarimetry
  88. GRB 180205A: Mondy optical observations
  89. GRB 180205A: Fermi GBM observation
  90. Konus-Wind observation of GRB 180204A
  91. GRB 180205A: VLT/X-shooter redshift
  92. GRB 180205A: GROND detection of the NIR/optical afterglow
  93. GRB 180205A: KAIT optical afterglow confirmation
  94. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  95. GRB 180204A: Swift-BAT refined analysis
  96. GRB 180204A: Swift/UVOT Upper Limits
  97. GRB 180204A: Fermi GBM detection
  98. GRB 180204A: Enhanced Swift-XRT position
  99. GRB 180204A: Swift-XRT refined Analysis
  100. GRB 180204A: Swift detection of a short burst

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