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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"

19662 results found.

  1. GRB 150317A: NOT optical observations
  2. GRB 150317A: Swift detection of a burst
  3. GRB 150314A: Early RAPTOR Detection
  4. Konus-Wind observation of GRB 150314A
  5. GRB 150314A: Swift-XRT refined Analysis
  6. GRB 150314A: KAIT Optical Observations
  7. GRB 150314A Swift-BAT refined analysis
  8. GRB 150314A: Swift/UVOT Detection
  9. GRB 150314A: Fermi GBM observation
  10. GRB 150314A: Skynet Yerkes-41 Observations of the Optical Afterglow
  11. GRB 150314A: Fermi-LAT detection
  12. GRB 150314A: Enhanced Swift-XRT position
  13. GRB 150314A: KAIT Optical Candidate
  14. GRB 150314A: Swift detection of a bright burst
  15. GRB 150309A: AAO optic upper limit
  16. GRB 150222A: CrAO optical observation
  17. Konus-Wind observation of GRB 150309A
  18. GRB 150309A: CrAO optic upper limit
  19. GRB 150309A: ISON-Kislovodsk optic upper limit
  20. GRB 150309A: Swift-BAT refined analysis
  21. GRB 150309A: Fermi GBM detection
  22. GRB150309A: Optical observations at Crni Vrh
  23. GRB 150309A: Swift/UVOT Upper Limits
  24. GRB 150309A: MASTER prompt optical observation
  25. GRB 150309A: Swift-XRT refined Analysis
  26. GRB 150309A : Liverpool Telescope observations
  27. GRB 150309A: Enhanced Swift-XRT position
  28. GRB 150309A: BOOTES-1 and -2 upper limit
  29. GRB 150309A: Swift detection of a burst
  30. GRB 150305A: a long GRB detected by INTEGRAL
  31. GRB 150305A: Swift XRT confirms weak INTEGRAL event as a new GRB
  32. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  33. Swift J0045.2+4151: analysis of XMM-Newton archival data
  34. Further UVOT Observations of Swift J0045.2+4151
  35. Further X-ray observations of Swift J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka [PFH2005] 622)
  36. GRB 150302A: BOOTES-2/TELMA upper limit
  37. Trigger 633105 (aka GRB150301C): Swift/UVOT Observations of XRT Counterpart
  38. GRB 150302A, Swift-BAT refined analysis
  39. GRB 150302A: Swift/UVOT Upper Limits
  40. GRB 150301C: XRT detection of a potential counterpart of BAT trigger 633105
  41. GRB 150302A: Swift-XRT refined Analysis
  42. GRB 150302A: Enhanced Swift-XRT position
  43. GRB 150301B: Swift-XRT refined Analysis
  44. GRB 150220A: further Swift-XRT observations
  45. GRB 150301B: Swift/UVOT Observations
  46. GRB 150301B: LCOGT-Sutherland observations
  47. GRB 150302A: KAIT Optical Upper Limit
  48. GRB 150302A: UVOT Observations
  49. GRB 150302A: Swift detection of a burst
  50. GRB 150301B: Fermi GBM detection
  51. GRB 150301B: Swift-BAT refined analysis
  52. GRB 150301B: GROND afterglow observations
  53. GRB 150301A: Swift/UVOT Upper Limits
  54. GRB 150301B: Enhanced Swift-XRT position
  55. GRB 150301A: Swift-BAT refined analysis
  56. GRB 150301B: MASTER early OT detection
  57. GRB 150301A: Swift-XRT refined Analysis
  58. GRB 150301C : (Swift trigger 633105) Swift observations
  59. GRB 150301B: Swift detection of a burst with an optical afterglow
  60. Swift Trigger 633173 is probably not an astrophysical source
  61. GRB 150301A: GROND Observations
  62. Trigger 633105 is likely not a GRB
  63. GRB 150301A: Fermi GBM observation
  64. GRB 150301A: Swift detection of a short burst or new SGR
  65. Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
  66. Trigger 632888: Swift detection of the magnetar 4U 0142+61
  67. GRB 150222A: Further GROND Observations
  68. GRB 150220A: Swift-XRT observations
  69. IPN Triangulation of GRB 150220A
  70. GRB 150220A: Swift ToO observations
  71. GRB 150222A: Swift/UVOT Upper Limits
  72. GRB 150222A: Swift-XRT refined Analysis
  73. Fermi GBM Observations of SGR 1935+2154
  74. GRB 150222A: GROND optical afterglow candidate
  75. GRB 150222A: Enhanced Swift-XRT position
  76. Fermi GBM trigger 150223068 is not a GRB
  77. GRB 150222A: Swift-BAT refined analysis
  78. SGR 1935+2154: Swift-BAT refined analysis
  79. GRB 150222A: Mondy optical observations
  80. GRB 150222A: Zadko observatory - Gingin optical observations
  81. GRB 150222A: MASTER early optical observations
  82. GRB 150222A: Swift detection of a burst
  83. Swift detection of an outburst from SGR 1935+2154
  84. Trigger 631946: Swift detection of H1745-203
  85. GRB 150219A: Swift-XRT afterglow detection
  86. Trigger 631747: Swift detection of 4U 0614+09
  87. GRB 150213B: AAO photometry
  88. GRB 150219A: Swift ToO observations
  89. GRB 150213B: Enhanced Swift-XRT position
  90. GRB 150213B: P60 Observations
  91. GRB 150213B: Swift/UVOT Detection
  92. GRB 150213B: Swift-BAT refined analysis
  93. GRB 150213B: RATIR Optical and NIR Observations
  94. GRB 150213B: Swift-XRT refined Analysis
  95. GRB 150213B: AAO optical observations
  96. GRB 150212A: Swift/UVOT Observations
  97. GRB 150213B: Tautenburg Afterglow Detection
  98. GRB 150213B: Swift detection of a burst with an optical afterglow
  99. GRB 150212A: Swift-XRT refined Analysis
  100. GRB 150211A: ROTSE-III Upper Optical Limit

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