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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"

27282 results found.

  1. Konus-Wind observation of GRB 180317A
  2. GRB 180325A: Swift/UVOT Detection
  3. Konus-Wind observation of GRB 180324A
  4. Konus-Wind observation of GRB 180325A
  5. GRB 180325A, Swift-BAT refined analysis
  6. GRB 180325A: GROND observations
  7. GRB 180325A: Global MASTER-Net OT prompt observations
  8. GRB 180325A: TAROT Calern observatory optical observations
  9. GRB 180325A: D50 early optical follow-up
  10. GRB 180325A: Swift-XRT refined Analysis
  11. GRB 180325A: RATIR Optical Observations
  12. GRB 180325A: prompt LT observations
  13. GRB 180324A, Swift-BAT refined analysis
  14. GRB 180325A: Swift detection of a burst with an optical counterpart
  15. GRB 180324A: Swift/UVOT Upper Limits
  16. GRB 180324A: Swift-XRT refined Analysis
  17. GRB 180324A: RATIR Optical Observations and Possible Afterglow Detection
  18. GRB 180324A: Swift detection of a burst
  19. GRB 180316A: RATIR Optical Observations
  20. GRB 180316A: RATIR Optical Observations, Possible Re-brightening
  21. GRB 180316A: Swift-BAT refined analysis
  22. GRB 180316A: Swift-XRT refined Analysis
  23. GRB 180316A: Swift/UVOT Detection
  24. GRB 180316A: RATIR Optical Observations
  25. GROND observations of GRB 180316A
  26. GRB180316A: MASTER-IAC OT light curve
  27. GRB180316A: MASTER-IAC optical detection
  28. GRB 180316A: Swift detection of a burst
  29. GRB 180314B: RATIR Optical Observations
  30. GRB 180314B: Swift-BAT refined analysis
  31. GRB 180314B: Swift/UVOT Upper Limits
  32. GRB 180314B: Swift-XRT refined Analysis
  33. GRB 180313A: Fermi GBM detection
  34. GRB 180314B: Swift detection of a burst
  35. GRB 180314A: Swift-BAT refined analysis
  36. Swift Trigger on MAXI J1820+070
  37. GRB 180314A: TAROT La Silla observatory optical observations
  38. GRB 180314A: Swift-XRT refined Analysis
  39. GRB 180314A: Fermi GBM observation
  40. GRB 180314A: Swift/UVOT Detection
  41. GRB 180314A: MASTER-Net OT dtetction
  42. GRB180314A: GROND detection of the afterglow
  43. GRB 180314A: Swift detection of a burst with an optical counterpart
  44. Trigger 814090: Swift detection of MAXI J1820+070
  45. GRB 180305A: AstroSat CZTI detection
  46. GRB 180311A: Swift/UVOT Upper Limits
  47. GRB 180311A, Swift-BAT refined analysis
  48. GRB 180311A: Swift-XRT refined Analysis
  49. Swift detection of MAXI J1820+070
  50. GRB 180311A: Swift detection of a burst
  51. GRB 180305A CALET Gamma-Ray Burst Monitor detection
  52. Trigger 813449: Swift detection of large burst from XTE J1701-407
  53. GRB 180305A: RATIR Optical Observations
  54. GRB 180305A: Swift/UVOT Upper Limits
  55. GRB 180305A: Fermi GBM detection
  56. GRB 180305A: Fermi-LAT detection
  57. GRB 180221B: Insight-HXMT/HE observation
  58. Fermi GBM trigger 541402602/180227234 is not a GRB
  59. GRB 180224A: Swift/UVOT Detection
  60. GRB 180210A: Insight-HXMT/HE observation
  61. Swift Trigger 811686 is probably not an astrophysical source.
  62. GRB 180224A: Swift-BAT refined analysis
  63. GRB 180224A: RATIR Optical Observations
  64. GRB 180224A: Swift-XRT refined Analysis
  65. GRB180224A: Global MASTER-Net bright OT detection
  66. GRB 180224A: Swift detection of a burst with an optical counterpart
  67. MAXI J1813-095 source: AbAO optical observations
  68. GRB 180222A: Swift/UVOT Upper Limits
  69. GRB 180221B CALET Gamma-Ray Burst Monitor detection
  70. GRB 180222A: Swift-XRT refined Analysis
  71. GRB 180222A: Swift-BAT refined analysis
  72. GRB 180222A: Swift detection of a burst
  73. Swift trigger 811074 (possible GRB 180221A): Swift refined analysis
  74. Swift Trigger 811167: Detection of MAXI J1813-095
  75. GRB 180219A CALET Gamma-Ray Burst Monitor detection
  76. GRB180221A: MASTER-OAFA optical observations
  77. Swift Trigger 811074: possible GRB 180221A
  78. Konus-Wind observation of GRB 180218A
  79. GRB 180218A CALET Gamma-Ray Burst Monitor detection
  80. GRB 180218A: Fermi GBM Detection
  81. IPN Triangulation of GRB 180218A (long/bright)
  82. GRB 180112A: AstroSat CZTI detection
  83. Fermi GBM triggers 540405116/180215689 and 540476225/180216512 are not a GRBs
  84. Swift J1658.2-4242: Swift BAT and XRT refined analysis
  85. Swift trigger 810300: MASTER-OAFA robotic report
  86. Swift J1658.2-4242 (trigger 810300): Swift-XRT position
  87. Swift Trigger 810300 is a probable new Galactic source: Swift J1658.2-4242
  88. GRB 180205A: SEDM Observations
  89. Retraction of Swift trigger 809374
  90. GRB 180210A: Fermi-LAT detection
  91. GRB 180210A: Fermi GBM detection
  92. Trigger 809374: Swift detection of a possible non-burst faint source
  93. Trigger 809217: Swift trigger on RS CVn Star HD 8357
  94. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  95. GRB 180202A: Insight-HXMT/HE detection
  96. GRB 180205A: confirmation of Swift-BAT trigger time.
  97. GRB 180205A: Swift/UVOT Detection
  98. GRB 180205A: Swift-XRT refined Analysis
  99. GRB 180205A: Swift-BAT refined analysis
  100. GRB 180205A: Further GROND Observations reveal Afterglow is still bright

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