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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"

24587 results found.

  1. GRB 180218A: Fermi GBM Detection
  2. IPN Triangulation of GRB 180218A (long/bright)
  3. GRB 180112A: AstroSat CZTI detection
  4. Swift J1658.2-4242: Swift BAT and XRT refined analysis
  5. Swift trigger 810300: MASTER-OAFA robotic report
  6. Swift Trigger 810300 is a probable new Galactic source: Swift J1658.2-4242
  7. Konus-Wind observation of GRB 180210A
  8. GRB 180205A: SEDM Observations
  9. GRB 180210A: Fermi-LAT detection
  10. GRB 180210A: Fermi GBM detection
  11. Trigger 809374: Swift detection of a possible non-burst faint source
  12. Trigger 809217: Swift trigger on RS CVn Star HD 8357
  13. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  14. GRB 180204A: MITSuME Okayama optical upper limits
  15. GRB 180205A: confirmation of Swift-BAT trigger time.
  16. GRB 180205A: Swift-BAT refined analysis
  17. GRB 180205A: Xinglong TNT optical observation
  18. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  19. GRB 180205A: VLT polarimetry
  20. GRB 180205A: Mondy optical observations
  21. GRB 180205A: Fermi GBM observation
  22. GRB 180205A: KAIT optical afterglow confirmation
  23. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  24. GRB 180204A: Swift-BAT refined analysis
  25. GRB 180204A: Fermi GBM detection
  26. GRB 180204A: Swift detection of a short burst
  27. GRB 180126A CALET Gamma-Ray Burst Monitor detection
  28. LIGO/Virgo GW170817: Chandra X-ray Emission Continues to Rise ~156 Days Post-Merger
  29. GRB 180120A: Fermi GBM Detection
  30. GRB 180120A CALET Gamma-Ray Burst Monitor detection
  31. GRB 180115A: SEDM Observations
  32. GRB 180116A CALET Gamma-Ray Burst Monitor detection
  33. Konus-Wind observation of GRB 171209A
  34. GRB 180112A CALET Gamma-Ray Burst Monitor detection
  35. GRB 180116A: Fermi GBM Detection
  36. Konus-Wind observation of GRB 180113B
  37. IPN Triangulation of GRB 180113B
  38. Konus-Wind observation of GRB 180113C
  39. e-MERLIN detection of GRB 171205A
  40. IPN Triangulation of GRB 180113C
  41. GRB 180115A: Swift-BAT refined analysis
  42. Konus-Wind observation of GRB 180113A
  43. GRB 180115A: MITSuME Akeno optical upper limits
  44. Konus-Wind observation of GRB 180111A
  45. GRB 180115A: Swift detection of a burst with an optical counterpart.
  46. GRB 180113C: Fermi GBM detection
  47. GRB 180113A: Swift-BAT refined analysis
  48. GRB 180113A: KAIT Optical Observations
  49. GRB 180113B: Fermi GBM detection
  50. GRB 180113A: Fermi GBM observation
  51. GRB 180113A: Swift detection of a burst
  52. GRB 180111A: Swift-BAT refined analysis
  53. GRB 180111A: Swift-XRT refined Analysis
  54. GRB180111A: Xinglong TNT possible optical detection
  55. Konus-Wind observation of GRB 180103A
  56. GRB 180103A: Swift-XRT observations
  57. GRB 171230A CALET Gamma-Ray Burst Monitor detection
  58. GRB 171229A CALET Gamma-Ray Burst Monitor detection
  59. VLBA detection of GRB 171205A
  60. GRB 180102A: Swift-BAT refined analysis
  61. GRB 180102A: MASTER-Net robotic report
  62. GRB 180102A: Fermi GBM detection
  63. GRB 180102A: Swift detection of a burst
  64. Konus-Wind observation of GRB 171227A
  65. IPN Triangulation of GRB 171227A
  66. GRB 171227A: Fermi GBM detection
  67. GRB 171212C CALET Gamma-Ray Burst Monitor detection
  68. Konus-Wind observation of GRB 171216B
  69. IceCube-171106A: Konus-Wind upper limits
  70. IceCube-171015A: Konus-Wind upper limits
  71. IceCube-170922A: Konus-Wind upper limits
  72. GRB 171222A: Swift-BAT refined analysis
  73. GRB 171223A: Fermi GBM detection
  74. GRB 171222A: Fermi GBM detection
  75. GRB 171222A: MASTER-Net OT observations
  76. GRB 171222A: Redshift from 10.4m GTC/OSIRIS
  77. GRB 171222A: Swift detection of a burst
  78. IPN Triangulation of GRB 171216B
  79. GRB 171216A: Swift-BAT refined analysis
  80. Swift Trigger 797070: KAIT Optical Observations
  81. GRB 171212A/Swift J1935.7+2036: Swift-BAT refined analysis
  82. GRB 171212A: Swift-XRT refined Analysis
  83. GRB 171212B: Fermi GBM observation
  84. GRB 171212B: Fermi-LAT detection
  85. Konus-Wind observation of GRB 171210A
  86. GRB 171211A: Swift-BAT refined analysis
  87. GRB 171210A: MASTER-Net optical observations
  88. GRB 171209A: MASTER-Net optical observations
  89. GRB 171210A: Swift-XRT and UVOT observations
  90. GRB 171210A: Fermi GBM detection
  91. GRB 171209A: Lulin 1m telescope observations
  92. GRB 171209A: Swift-BAT refined analysis
  93. GRB 171210A: Fermi-LAT detection
  94. Konus-Wind observation of GRB 171205A
  95. GRB 171205A: iTelescope optical observations
  96. GRB 171209A: Swift/UVOT Analysis of the burst
  97. Swift trigger 796115 is not astrophysical
  98. Swift Trigger 796115 is probably not a GRB
  99. GRB 171209A: LCO 1-m telescope observations
  100. Swift Trigger 796098 is probably a noise peak near M31

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