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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"

32718 results found.

  1. GRB 050509a: Swift XRT Position
  2. GRB 050505: Keck I-band Magnitude
  3. GRB 050505: early time observations
  4. GRB 050502a: Swift XRT Upper Limit
  5. GRB 050505, simultaneous optical observation
  6. GRB050505: Infrared observations
  7. GRB 050505: Further Swift UVOT observations.
  8. GRB050505: AAVSO observations
  9. GRB050416A : 1 GHz limit from GMRT
  10. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  11. GRB 050505 UVOT
  12. GRB050505: Optical Afterglow Candidate
  13. GRB 050505: Swift XRT Position
  14. GRB050505 Swift-BAT refined analysis
  15. GRB 050502a: Optical Observations
  16. GRB 050416b:Swift XRT afterglow upper limits
  17. GRB 050416b:Swift XRT afterglow upper limits
  18. Swift-BAT detection of GRB050505
  19. GRB 050504: Swift XRT position
  20. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  21. GRB050502b: Afterglow Confirmation
  22. GRB050502: P200 Observations (Correction)
  23. GRB050502: P200 Observations
  24. GRB 050504 : R band observation at Lulin observatory
  25. Swift UVOT observation of GRB 050504
  26. GRB 050504, R band Observations
  27. GRB050504: P60 Observations
  28. GRB 050502b, Optical observations
  29. GRB050502a: P60 Observations (Correction)
  30. GRB050502a: P60 Observations
  31. GRB 050502a: RBO Observations
  32. GRB 050502A: WSRT Radio Observations
  33. GRB050502A: Optical Observations
  34. GRB050502B Swift-BAT refined analysis
  35. GRB050502B: I band source in XRT error circle
  36. Swift UVOT refined analysis
  37. Retraction of Swift-BAT trigger 116145
  38. GRB 050502a : R band observation at Lulin observatory
  39. GRB 050502b : optical observation at Lulin observatory
  40. GRB 050502b: Swift XRT Position
  41. GRB050502B: Optical Limits from ANU 1m
  42. GRB 050502: INTEGRAL results
  43. GRB050502: ANU 1m optical Observations
  44. GRB 050502: Confirmed variability of the afterglow candidate +
  45. GRB 050502: PAIRITEL IR Observations
  46. GRB 050502: ROTSE-III Detection of Possible Counterpart
  47. Swift-BAT Trigger 115881 is not a real GRB
  48. Swift/BAT possible detection of a weak burst GRB050430
  49. GRB 050401: Rc observation
  50. GRB050416a: Radio Detection
  51. GRB 050422: Swift-UVOT observation
  52. GRB 050422: Swift-BAT refined analysis
  53. GRB 050422: Swift XRT Position
  54. GRB 050421: NIR observations
  55. GRB 050416: Optical/NIR observations
  56. GRB 050421: SLOTIS observations
  57. GRB 050421: Further Analysis of IR imaging
  58. GRB050421: Radio Observations
  59. GRB050421: Radio Observations
  60. GRB 050421: Swift-UVOT observation
  61. GRB 050421: IR Observations
  62. GRB 050421: Swift-BAT refined analysis
  63. GRB 050421: ROTSE-III Optical Limits
  64. GRB 050421: NIR observations re-examination
  65. GRB050421
  66. GRB 050421: early Swift XRT analysis results
  67. GRB 050421: NIR observations
  68. GRB050421: P60 Observations
  69. GRB 050421: BOOTES-2 simultaneous optical observations
  70. GRB 050421: Optical observations at the INT
  71. Swift Detection of GRB050421
  72. GRB 050416b: Tentative Swift XRT Position
  73. GRB 050315: potential host galaxy
  74. GRB050418: Null Optical Observations
  75. GRB 050412: Chandra observations
  76. GRB050416A, optical observations
  77. GRB 050418: Swift-BAT refined analysis
  78. GRB 050416: Mitsume optical observation
  79. GRB 050416 : optical observation at Xinglong observatory
  80. GRB 050416B: optical observations
  81. GRB 050416b: Swift-BAT refined analysis
  82. GRB 050416b: LCO observations
  83. GRB 050416b: LCO observations
  84. GRB050416B: IR observations
  85. GRB 050416: Swift/UVOT refined analysis
  86. GRB050412: Radio Observations
  87. GRB 050416: Swift/UVOT detection of afterglow emission
  88. GRB050416: Refined Swift-XRT analysis
  89. GRB 050416: Swift-BAT refined analysis
  90. GRB 050416: ART observations
  91. GRB 050416: KAIT observations
  92. GRB050416: P200 NIR Observations
  93. GRB 050416: Swift XRT Position
  94. GRB 050416: Radio observations
  95. GRB 050412: Subaru observations
  96. GRB 050408: RTT150 optical observations
  97. GRB050408: optical observation
  98. GRB 050412: PROMPT VRcIc Observations
  99. GRB 050408: Kuiper 1.5m observations
  100. GRB 050412: optical limit

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