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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"

32736 results found.

  1. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  2. GRB 050509b: Further Analysis of Keck LRIS Images
  3. GRB 050509b: Physical Properties of the Candidate Host galaxy
  4. GRB 050505: SARA Observations
  5. Swift UVOT Follow-up Observations of GRB 050509B
  6. GRB 050509B, Optical Observations
  7. GRB 050509B: Swift/XRT refined analysis
  8. GRB050509a: Swift UVOT observations
  9. GRB 050509b: Optical observations
  10. GRB 050509b: Precision Astrometry
  11. GRB 050509b: Possible Optical Counterpart
  12. GRB 050509A: Optical observations
  13. GRB 050509b: Optical Counterpart Candidate
  14. GRB050509b: Radio Observations
  15. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  16. GRB 050509b: optical observations
  17. GRB 050509b: Swift XRT Position
  18. GRB 050509B: ROTSE-III Optical Limits
  19. GRB 050509a: Swift XRT Position
  20. GRB 050505: Keck I-band Magnitude
  21. GRB 050505: early time observations
  22. GRB 050502a: Swift XRT Upper Limit
  23. GRB 050505, simultaneous optical observation
  24. GRB050505: Infrared observations
  25. GRB 050505: Further Swift UVOT observations.
  26. GRB050505: AAVSO observations
  27. GRB050416A : 1 GHz limit from GMRT
  28. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  29. GRB 050505 UVOT
  30. GRB050505: Optical Afterglow Candidate
  31. GRB 050505: Swift XRT Position
  32. GRB050505 Swift-BAT refined analysis
  33. GRB 050502a: Optical Observations
  34. GRB 050416b:Swift XRT afterglow upper limits
  35. GRB 050416b:Swift XRT afterglow upper limits
  36. Swift-BAT detection of GRB050505
  37. GRB 050504: Swift XRT position
  38. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  39. GRB050502b: Afterglow Confirmation
  40. GRB050502: P200 Observations (Correction)
  41. GRB050502: P200 Observations
  42. GRB 050504 : R band observation at Lulin observatory
  43. Swift UVOT observation of GRB 050504
  44. GRB 050504, R band Observations
  45. GRB050504: P60 Observations
  46. GRB 050502b, Optical observations
  47. GRB050502a: P60 Observations (Correction)
  48. GRB050502a: P60 Observations
  49. GRB 050502a: RBO Observations
  50. GRB 050502A: WSRT Radio Observations
  51. GRB050502A: Optical Observations
  52. GRB050502B Swift-BAT refined analysis
  53. GRB050502B: I band source in XRT error circle
  54. Swift UVOT refined analysis
  55. Retraction of Swift-BAT trigger 116145
  56. GRB 050502a : R band observation at Lulin observatory
  57. GRB 050502b : optical observation at Lulin observatory
  58. GRB 050502b: Swift XRT Position
  59. GRB050502B: Optical Limits from ANU 1m
  60. GRB 050502: INTEGRAL results
  61. GRB050502: ANU 1m optical Observations
  62. GRB 050502: Confirmed variability of the afterglow candidate +
  63. GRB 050502: PAIRITEL IR Observations
  64. GRB 050502: ROTSE-III Detection of Possible Counterpart
  65. Swift-BAT Trigger 115881 is not a real GRB
  66. Swift/BAT possible detection of a weak burst GRB050430
  67. GRB 050401: Rc observation
  68. GRB050416a: Radio Detection
  69. GRB 050422: Swift-UVOT observation
  70. GRB 050422: Swift-BAT refined analysis
  71. GRB 050422: Swift XRT Position
  72. GRB 050421: NIR observations
  73. GRB 050416: Optical/NIR observations
  74. GRB 050421: SLOTIS observations
  75. GRB 050421: Further Analysis of IR imaging
  76. GRB050421: Radio Observations
  77. GRB050421: Radio Observations
  78. GRB 050421: Swift-UVOT observation
  79. GRB 050421: IR Observations
  80. GRB 050421: Swift-BAT refined analysis
  81. GRB 050421: ROTSE-III Optical Limits
  82. GRB 050421: NIR observations re-examination
  83. GRB050421
  84. GRB 050421: early Swift XRT analysis results
  85. GRB 050421: NIR observations
  86. GRB050421: P60 Observations
  87. GRB 050421: BOOTES-2 simultaneous optical observations
  88. GRB 050421: Optical observations at the INT
  89. Swift Detection of GRB050421
  90. GRB 050416b: Tentative Swift XRT Position
  91. GRB 050315: potential host galaxy
  92. GRB050418: Null Optical Observations
  93. GRB 050412: Chandra observations
  94. GRB050416A, optical observations
  95. GRB 050418: Swift-BAT refined analysis
  96. GRB 050416: Mitsume optical observation
  97. GRB 050416 : optical observation at Xinglong observatory
  98. GRB 050416B: optical observations
  99. GRB 050416b: Swift-BAT refined analysis
  100. GRB 050416b: LCO observations

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