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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"

26683 results found.

  1. GRB 100111A: Swift detection of a burst with an optical afterglow
  2. Swift/BAT Detects an Outburst from XTE J1901+014
  3. GRB 100103A: GROND Upper Limits
  4. GRB 100103A: Swift-XRT team refined analysis
  5. GRB 100103A - UVOT-enhanced XRT position
  6. Konus-Wind observation of GRB 100103A
  7. GRB 100103A: Swift/XRT position
  8. GRB 091231: GROND NIR observations
  9. Swift Trigger 381591: Uncatalogued UVOT Source
  10. GRB 091230: Swift/UVOT Observations
  11. Trigger 381591: Swift detection of a possible burst
  12. GRB 091230: Swift-XRT observation
  13. GRB 091230: GROND optical/NIR afterglow candidate
  14. Swift Trigger 381434 is not a GRB
  15. Trigger 381434: Swift detection of a possible burst
  16. GRB 091221: Fermi GBM Observation
  17. GRB 091117: Swift-XRT late time observations
  18. GRB 091221: Swift/UVOT refined analysis
  19. GRB 091221: Swift-XRT refined analysis
  20. GRB 091221: Enhanced Swift-XRT position
  21. GRB 091221: UVOT Confirmation of an Optical Afterglow
  22. GRB 091221: Swift detection of a burst
  23. Swift trigger 379449 (possible GRB) is not a burst
  24. GRB 091215: Faulkes Telescope North observations
  25. Trigger 379449: Swift detection of a possible burst
  26. GRB 091208A: Suzaku WAM observation of the prompt emission
  27. GRB 091208A: GAO 150cm telescope Optical Observation
  28. Konus-Wind observation of GRB 091208A
  29. GRB 091208B: GAO 150cm telescope Optical Observation
  30. GRB091208A: Swift/UVOT refined analysis
  31. GRB 091208B: optical observations
  32. GRB 091208B: GROND observations
  33. GRB 091208A: Swift-XRT observations
  34. GRB091208B: NOT optical observations
  35. GRB 091208B: Swift-XRT refined analysis
  36. GRB 091208B: Fermi GBM observation
  37. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  38. GRB 091208A, RIMOTS optical upper limits
  39. GRB 091208B: MITSuME Akeno Optical Observation
  40. GRB 091208B: Enhanced Swift-XRT position
  41. GRB 091208B: MITSuME Okayama Optical Observation
  42. GRB 091208B, RIMOTS optical upper limits
  43. GRB 091208B: Swift detection of a burst with an optical afterglow
  44. GRB 091208B: BOOTES-3 optical afterglow
  45. GRB 091123: Suzaku WAM observation of the prompt emission
  46. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  47. GRB 091109A: GROND confirmation of redshift z = 3.5
  48. GRB 091127, SMARTS optical/IR afterglow observations
  49. GRB091202: Swift-XRT refined analysis
  50. GRB 091202: Swift/UVOT Upper Limits
  51. GRB 091202: Liverpool Telescope observations
  52. GRB 091202 - UVOT-enhanced XRT position
  53. GRB 091127: Zadko Telescope Observations
  54. GRB 091126A: Suzaku WAM observation of the prompt emission
  55. GRB 091202: TAROT Calern observatory optical observations
  56. GRB 091202: Liverpool Telescope Observations
  57. GRB 091127: redshift confirmation with X-shooter
  58. GRB 091117: Chandra Observations
  59. Short X-ray Transient Detection by MAXI/GSC
  60. Konus-Wind observation of very long GRB 091123
  61. GRB 091123: Fermi GBM detection of a very long burst
  62. GRB 091126B: Fermi GBM detection
  63. GRB 091127: Suzaku WAM observation of the prompt emission
  64. GRB 091126: Fermi GBM detection
  65. GRB 091130B: Swift-XRT team refined analysis
  66. GRB 091130B: Swift/UVOT Upper Limits
  67. GRB 091130B: Enhanced Swift-XRT position
  68. Swift trigger 377436 (possible GRB 091130A) is not a burst
  69. GRB 091130B: Swift detection of a burst
  70. GRB 091127: Radio observations
  71. GRB 091128: Fermi GBM detection
  72. Konus-Wind observation of GRB 091127
  73. GRB 091127: TAROT La Silla observatory optical observations
  74. GRB 091127: LABOCA/APEX submm observations
  75. GRB 091127: Further NOT optical observations
  76. GRB 091127: Fermi GBM detection
  77. GRB 091127: MASTER early optical transient polarimetry
  78. GRB 091127: Gemini-N redshift
  79. GRB 091127: Swift-XRT afterglow detection and analysis
  80. GRB 091127: TAROT La Silla observatory optical decay
  81. GRB 091127: Swift/UVOT observations
  82. GRB 091127: NOT observations
  83. GRB 091127 : GROND observations
  84. GRB 091127: REM NIR afterglow detection
  85. GRB 091127: Liverpool Telescope afterglow candidate
  86. Konus-Wind observation of GRB 091120
  87. GRB 091120: Fermi GBM observation
  88. GRB 091117A: Suzaku WAM observation of the prompt emission
  89. GRB 091117: TNG optical observations
  90. GRB 091117A: Swift/UVOT followup observations
  91. GRB 091117: VLA radio observations
  92. GRB 091117: Swift-XRT observations
  93. GRB 091117: Evidence for Variability of XRT Source #1
  94. GRB091117: Gemini South Observations
  95. GRB 091117: Swift XRT refined analysis
  96. Konus-Wind observations of GRB 091117A
  97. GRB 091112: Suzaku WAM observation of the prompt emission
  98. GRB 091102A: Suzaku WAM observation of the prompt emission
  99. GRB 091109B: Suzaku WAM observation of the prompt emission
  100. GRB091111: Swift XRT refined analysis

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