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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"

27113 results found.

  1. GRB 150323C: Khureltogot optical observations
  2. GRB 150403A: Swift-XRT refined Analysis
  3. GRB 150403A: Fermi-LAT detection
  4. GRB 150403A: Swift detection of a burst with an optical counterpart
  5. GRB 150402A: results of Swift observations
  6. GRB 150402A: RATIR Optical Observations
  7. GRB 150402A detected in ground analysis of Swift-BAT data
  8. GRB 150330A: Fermi GBM detection
  9. GRB 141212A: GMG observation limit
  10. GRB 141220A: GMG observation limit
  11. GRB 141225A: GMG observation limit
  12. GRB 150120B: GMG observation
  13. Konus-Wind observation of GRB 150323B
  14. Konus-Wind observation of GRB 150323A
  15. GRB 150323B : Xinglong TNT upper limit
  16. GRB 150323C, Swift-BAT refined analysis
  17. GRB 150323C: Swift/UVOT Upper Limits
  18. GRB 150323C: RATIR Optical Afterglow Observations
  19. GRB 150323C : Xinglong TNT optical observation
  20. GRB 150323C: Swift-XRT refined Analysis
  21. GRB 150323A, Swift-BAT refined analysis
  22. GRB150323C: Fermi GBM detection
  23. GRB 150323B: Fermi GBM observation
  24. GRB 150323C: MASTER-net optical observation
  25. GRB 150323C: Swift detection of a burst
  26. GRB 150323A: Swift-XRT refined Analysis
  27. GRB150323A: Swift-UVOT detection of the afterglow
  28. GRB 150314A: GMG observation limit
  29. GRB 150323A: RATIR Optical Afterglow Observations
  30. GRB 150323A: P60 Optical Afterglow Candidate
  31. GRB 150323A: Swift detection of a burst
  32. Swift Triggers 635788-635794 are probably not real.
  33. Fermi GBM trigger 150319666 is not a GRB
  34. GRB 150318A: Swift-XRT refined Analysis
  35. Confirmation that Swift trigger 635306 is not an astrophysical source
  36. GRB 150318A: Skynet PROMPT-CTIO Observations
  37. GRB 150318A: Swift-BAT refined analysis
  38. GRB 150318A: Swift/UVOT Upper Limits
  39. GRB 150318A : GROND upper limits
  40. Swift Trigger 635306 is probably not an astrophysical source
  41. GRB 150318A: Swift detection of a burst
  42. GRB 150317A: Swift/UVOT Upper Limits
  43. GRB 150317A: Swift-XRT refined Analysis
  44. GRB 150317A: Swift-BAT refined analysis
  45. GRB 150317A: RATIR Optical Afterglow Detection
  46. GRB 150317A: Swift detection of a burst
  47. GRB 150314A: Early RAPTOR Detection
  48. Konus-Wind observation of GRB 150314A
  49. GRB 150314A: Swift-XRT refined Analysis
  50. GRB 150314A: P60 observations
  51. GRB 150314A Swift-BAT refined analysis
  52. GRB 150314A: Swift/UVOT Detection
  53. GRB 150314A: Fermi GBM observation
  54. GRB 150314A: Skynet Yerkes-41 Observations of the Optical Afterglow
  55. GRB 150314A: Fermi-LAT detection
  56. GRB 150314A: Swift detection of a bright burst
  57. Fermi GBM trigger 150312827 is not a GRB
  58. GRB 150311A: Konus-Wind trigger at 16:16:24 is not a GRB
  59. GRB 150311A: MAXI/GSC possible afterglow detection
  60. Konus-Wind observation of GRB 150309A
  61. GRB 150309A: ISON-Kislovodsk optic upper limit
  62. Fermi GBM trigger 150311331 is not a GRB
  63. GRB 150309A: Swift-BAT refined analysis
  64. GRB 150309A: Fermi GBM detection
  65. GRB150309A: Optical observations at Crni Vrh
  66. GRB 150309A: Swift/UVOT Upper Limits
  67. GRB 150309A: MASTER prompt optical observation
  68. GRB 150309A: Swift-XRT refined Analysis
  69. GRB 150309A : Liverpool Telescope observations
  70. GRB 150309A: BOOTES-1 and -2 upper limit
  71. GRB 150309A: Swift detection of a burst
  72. GRB 150305A: Swift XRT confirms weak INTEGRAL event as a new GRB
  73. Fermi GBM trigger 150307942 is not a GRB
  74. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  75. Further UVOT Observations of Swift J0045.2+4151
  76. Fermi GBM trigger 150305751 is not a GRB
  77. Further X-ray observations of Swift J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka [PFH2005] 622)
  78. BAT trigger 633105 (GRB 150301C): NOT r-band upper limit
  79. GRB 150302A: BOOTES-2/TELMA upper limit
  80. Trigger 633105 (aka GRB150301C): Swift/UVOT Observations of XRT Counterpart
  81. GRB 150302A, Swift-BAT refined analysis
  82. GRB 150302A: Swift/UVOT Upper Limits
  83. GRB 150301C: XRT detection of a potential counterpart of BAT trigger 633105
  84. GRB 150302A: Swift-XRT refined Analysis
  85. GRB 150301B: Swift-XRT refined Analysis
  86. GRB 150301B: Swift/UVOT Observations
  87. GRB 150301B: LCOGT-Sutherland observations
  88. GRB 150302A: UVOT Observations
  89. GRB 150302A: Swift detection of a burst
  90. GRB 150301B: Fermi GBM detection
  91. GRB 150301B: Swift-BAT refined analysis
  92. GRB 150301B: GROND afterglow observations
  93. GRB 150301A: Swift/UVOT Upper Limits
  94. GRB 150301A: Swift-BAT refined analysis
  95. GRB 150301B: MASTER early OT detection
  96. GRB 150301A: Swift-XRT refined Analysis
  97. GRB 150301C : (Swift trigger 633105) Swift observations
  98. GRB 150301B: Swift detection of a burst with an optical afterglow
  99. Swift Trigger 633173 is probably not an astrophysical source
  100. GRB 150301A: GROND Observations

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