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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"

43960 results found.

  1. Konus-Wind observation of GRB 180111A
  2. GRB 180115A: Swift detection of a burst with an optical counterpart.
  3. GRB 180113C: Fermi GBM detection
  4. GRB 180111A CALET Gamma-Ray Burst Monitor detection
  5. GRB 180113A: Swift-BAT refined analysis
  6. GRB 180111A: AbAO optical observations
  7. GRB 180113A: KAIT Optical Observations
  8. GRB 180113B: Fermi GBM detection
  9. GRB 180113A: Fermi GBM observation
  10. GRB 180111A: Swift/UVOT Detection
  11. GRB 180103A: Swift-XRT afterglow detection
  12. GRB 180113A: Swift detection of a burst
  13. GRB 180111A: Swift-BAT refined analysis
  14. GRB 180111A: RATIR Optical and NIR Observations
  15. GRB 180111A: Swift-XRT refined Analysis
  16. GRB 180111A: AGILE/MCAL detection
  17. GRB180111A: Xinglong TNT possible optical detection
  18. GRB 180111A: Enhanced Swift-XRT position
  19. GRB 180111A: Swift detection of a burst with an optical counterpart
  20. GRB 171230B: Insight-HXMT/HE detection
  21. GRB 180103A: LCO Sutherland 1-m telescope observations
  22. Konus-Wind observation of GRB 180103A
  23. GRB 171227A: AstroSat CZTI detection
  24. GRB 171223A; AstroSat CZTI detection
  25. Fermi GBM Trigger 537135776/180108849 is not a GRB
  26. GRB 180103A: AstroSat CZTI detection
  27. GRB 180103A: Swift/UVOT Upper Limits
  28. GRB 180103A: Swift-XRT observations
  29. GRB 171230A CALET Gamma-Ray Burst Monitor detection
  30. GRB 180103A: Swift ToO observations
  31. GRB 180103A: Swift detection of a burst
  32. GRB 171229A CALET Gamma-Ray Burst Monitor detection
  33. GRB 180102A AROMA-N optical observation
  34. VLBA detection of GRB 171205A
  35. GRB 180102A: TSHAO optical upper limit
  36. GRB 180102A: Swift-BAT refined analysis
  37. GRB 180102A: Swift/UVOT Upper Limits
  38. GRB 180102A: NOT optical observations
  39. GRB 180102A: MASTER-Net robotic report
  40. GRB 180102A: Swift-XRT refined Analysis
  41. GRB 180102A: Fermi GBM detection
  42. GRB 180102A: Enhanced Swift-XRT position
  43. GRB 180102A: Prompt enhanced Swift-XRT position
  44. GRB 180102A: Swift detection of a burst
  45. Konus-Wind observation of GRB 171227A
  46. IPN Triangulation of GRB 171227A
  47. GRB 171227A: Fermi GBM detection
  48. GRB 171227A: AGILE/MCAL detection
  49. GRB 171215A: Insight-HXMT/HE detection
  50. GRB 171223A: Insight-HXMT/HE detection
  51. GRB 171212C CALET Gamma-Ray Burst Monitor detection
  52. Konus-Wind observation of GRB 171216B
  53. IceCube-171106A: Konus-Wind upper limits
  54. IceCube-171015A: Konus-Wind upper limits
  55. IceCube-170922A: Konus-Wind upper limits
  56. GRB 171222A: Swift-BAT refined analysis
  57. GRB 171222A: AROMA-N optical observation
  58. GRB 171223A: Fermi GBM detection
  59. GRB 171222A: Fermi GBM detection
  60. GRB 171222A: Nanshan-0.36m optical upper limit
  61. GRB 171222A: Swift/UVOT Upper Limits
  62. GRB 171222A: Nanshan-1m optical afterglow detection
  63. GRB 171222A: MASTER-Net OT observations
  64. GRB 171222A: Redshift from 10.4m GTC/OSIRIS
  65. GRB 171222A: Swift-XRT refined Analysis
  66. GRB 171205A: SMARTS optical/IR supernova monitoring
  67. GRB 171222A: NOT Optical Afterglow
  68. GRB 171216B CALET Gamma-Ray Burst Monitor detection
  69. GRB 171210A CALET Gamma-Ray Burst Monitor detection
  70. GRB 171222A: Enhanced Swift-XRT position
  71. GRB 171222A: Swift detection of a burst
  72. GMRT Radio detection of GRB 171205A
  73. IPN Triangulation of GRB 171216B
  74. GRB 171216A: Swift/UVOT Upper Limits
  75. GRB 171210A: Further Swift-XRT observations
  76. GRB 171216A: Swift-XRT refined Analysis
  77. GRB 171216A: Swift-BAT refined analysis
  78. GRB 171205A: RATAN observations
  79. GRB 171216A: Enhanced Swift-XRT position
  80. GRB 171216A: Swift detection of a burst
  81. Swift Trigger 797070: KAIT Optical Observations
  82. Swift Trigger 797070 is probably not a GRB
  83. GRB 171212A/Swift J1935.7+2036: Swift-BAT refined analysis
  84. GRB 171205A: ALMA observations
  85. GRB 171212A: Swift-XRT refined Analysis
  86. GRB 171211A iTelescope observation
  87. GRB 171212B: Fermi GBM observation
  88. GRB 171212A/Swift J1935.7+2036: Swift/UVOT Upper Limits
  89. GRB 171212B: Fermi-LAT detection
  90. GRB 171212A/Swift J1935.7+2036: TSHAO optical observations
  91. GRB 171212A: Enhanced Swift-XRT position
  92. Konus-Wind observation of GRB 171210A
  93. GRB 171212A: Swift detection of a burst or a Galactic transient
  94. GRB 171211A: Swift-BAT refined analysis
  95. GRB 171211A: Swift-XRT refined Analysis
  96. GRB 171210A: MASTER-Net optical observations
  97. GRB 171209A: MASTER-Net optical observations
  98. GRB 171211A: Enhanced Swift-XRT position
  99. GRB 171210A: Swift-XRT and UVOT observations
  100. GRB 171211A: Swift detection of a possibly short burst

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