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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"

19670 results found.

  1. Swift detection of a burst from LS I +61 303
  2. GRB 120202A: GROND observations
  3. GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
  4. GRB 120202A: Swift/XRT and UVOT observations
  5. GRB 111228A: Possible host detected by Swift/UVOT
  6. IPN Triangulation of GRB 120129A (long/intense)
  7. GRB 120118B: optical upper limit
  8. GRB 120116A: optical upper limit
  9. GRB 120119A: EVLA observations
  10. GRB 120119A: GRT detection of early afterglow
  11. GRB 120119A: optical upper limit
  12. GRB 120121A: Swift/UVOT Upper Limits
  13. GRB 120121A: Swift-XRT refined Analysis
  14. GRB 120121A: Swift-BAT refined analysis
  15. GRB 120121A: Enhanced Swift-XRT position
  16. GRB 120121A: ISON-NM optical observations
  17. GRB 120121A: Swift-XRT position
  18. GRB 120121A: Swift detection of a burst
  19. GRB 120119A, Swift-BAT refined analysis
  20. GRB 120119A: TAROT La Silla observatory optical observations
  21. GRB 120119A: optical observations
  22. GRB 120119A: Swift/UVOT Observations
  23. GRB 120119A: Swift-XRT refined Analysis
  24. GRB 120119A: Enhanced Swift-XRT position
  25. GRB 120119A: Fermi GBM observation
  26. GRB 120118B, Swift-BAT refined analysis
  27. Konus-Wind observation of GRB 120119A
  28. GRB 120119A: optical observations
  29. GRB 120118B: Swift-XRT refined Analysis
  30. GRB 120118B : Lulin Optical limit
  31. GRB 120119A: GROND Detection of the Optical/NIR Afterglow
  32. GRB 120118B: Swift/UVOT Upper Limits
  33. GRB 120119A: Liverpool Telescope afterglow detection
  34. GRB 120119A: PAIRITEL NIR Detection
  35. GRB 120119A: Swift detection of a burst with an optical counterpart
  36. GRB 120118B: NOT observations
  37. GRB 120118B: Enhanced Swift-XRT position
  38. GRB 120118B: Faulkes Telescope South observations
  39. GRB 120118B: Swift-XRT position
  40. GRB 120118B: MASTER optical observations
  41. GRB 120118B: Swift detection of a burst
  42. GRB 120116A: Swift/UVOT Upper Limits
  43. GRB 120116A: Swift-XRT refined Analysis
  44. GRB 120116A: Enhanced Swift-XRT position
  45. AXP 4U 1042+61: Mondy optical observations
  46. GRB 120116A: Mondy optical observations
  47. GRB 120116A: EVLA observations
  48. GRB 120116A: Optical observations at Crni Vrh
  49. GRB 120116A: Swift-BAT refined analysis
  50. GRB 120116A: NOT observations
  51. GRB 120116A: Bassano Bresciano Observatory optical observations
  52. GRB 120116A: MASTER Early optical limit
  53. GRB 120116A: Swift detection of a burst
  54. GRB 120114A found in ground analysis of BAT data
  55. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  56. GRB 120106A: optical upper limit
  57. Swift detection of an SGR burst from AXP 4U 0142+61
  58. IPN Triangulation of GRB 120107A
  59. GRB 120106A: Swift/UVOT Upper Limits
  60. GRB 120106A: Bassano Bresciano Observatory optical observations
  61. GRB 120106A: MASTER Early OT marginally detection
  62. GRB 120106A: Swift-XRT refined Analysis
  63. GRB 120106A: Swift-BAT refined analysis
  64. GRB 120106A: Enhanced Swift-XRT position
  65. GRB 120106A: TAROT Calern observatory optical observations
  66. GRB 120106A: MASTER-Tunka optical observations
  67. GRB 120106A: Swift detection of a burst
  68. GRB 111222A: Second Swift observation
  69. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  70. GRB 120102A: Fermi GBM observation
  71. Konus-Wind observation of GRB 120102A
  72. GRB 120102A: Swift-BAT refined analysis
  73. GRB 120102A: Swift-XRT refined Analysis
  74. GRB 120102A: Swift/UVOT Detection
  75. GRB 120102A: Enhanced Swift-XRT position
  76. GRB 120102A: Swift detection of a burst with an optical counterpart
  77. GRB 111228A, optical observations
  78. Konus-Wind observation of GRB 111228A
  79. GRB 111229A: Swift/UVOT Detection
  80. GRB 111229A: Faulkes Telescope South observations
  81. GRB 111229A: Swift-XRT refined Analysis
  82. GRB 111229A: Enhanced Swift-XRT position
  83. GRB 111229A: Swift-BAT refined analysis
  84. GRB 111229A: Swift detection of a burst
  85. GRB 111225A: Lightbuckets Optical Observations
  86. GRB 111228A: P60 Observations
  87. GRB 111228A: T100 observations
  88. GRB 111228A: Swift-XRT refined Analysis
  89. GRB 111228A: PAIRITEL NIR Detection
  90. GRB 111228A: TAROT La Silla observatory observations
  91. GRB 111228A: MASTER OT observations
  92. GRB 111228A: Swift/UVOT Detection
  93. GRB 111228A, Swift-BAT refined analysis
  94. GRB 111228A: Enhanced Swift-XRT position
  95. GRB 111228A: TAROT Calern observatory. OT decay stopped
  96. GRB 111228A: Fermi GBM observation
  97. GRB 111228A: TAROT Calern observatory. OT seems still bright
  98. GRB 111228A: Swift detection of a burst with an optical counterpart
  99. GRB 111225A: Swift/UVOT Observations
  100. GRB 111215A: Keck/LRIS Imaging

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