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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"

28097 results found.

  1. GRB 050509a: Swift-BAT refined analysis
  2. GRB 050509c: ROTSE-III Optical Limits
  3. GRB 050505, early TAROT observation
  4. GRB050509c: REM NIR and Optical observations
  5. GRB 050509b: Physical Properties of the Candidate Host galaxy
  6. GRB 050505: SARA Observations
  7. GRB 050509B, Optical Observations
  8. GRB 050509B: Swift/XRT refined analysis
  9. GRB 050509b: Optical observations
  10. GRB 050509A: Optical observations
  11. GRB050509b: Radio Observations
  12. GRB 050509b: PAIRITEL and WIYN Observations
  13. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  14. Swift Detection of GRB050509b: A short duration burst
  15. Swift Detection of the Burst GRB050509
  16. GRB 050505: early time observations
  17. GRB 050505, simultaneous optical observation
  18. GRB050505: AAVSO observations
  19. GRB050416A : 1 GHz limit from GMRT
  20. GRB050505: Optical Afterglow Candidate
  21. GRB050505 Swift-BAT refined analysis
  22. GRB 050416b:Swift XRT afterglow upper limits
  23. GRB 050416b:Swift XRT afterglow upper limits
  24. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  25. GRB050502b: Afterglow Confirmation
  26. GRB050502: P200 Observations (Correction)
  27. GRB050502: P200 Observations
  28. GRB 050504 : R band observation at Lulin observatory
  29. Swift UVOT observation of GRB 050504
  30. GRB 050504, R band Observations
  31. GRB 050502b, V band Observations
  32. GRB050504: P60 Observations
  33. GRB 050504: A long GRB detected with INTEGRAL
  34. GRB (?) 050504: IR Observations, Intriguing Source
  35. GRB 050502b, Optical observations
  36. GRB050502a: P60 Observations (Correction)
  37. GRB050502a: P60 Observations
  38. Renewal of SGR 1806-20 activity
  39. GRB050502B Swift-BAT refined analysis
  40. Swift UVOT refined analysis
  41. GRB 050502a : R band observation at Lulin observatory
  42. GRB 050502b : optical observation at Lulin observatory
  43. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  44. Swift Detection of the Bright Burst GRB050502b
  45. GRB 050502: INTEGRAL results
  46. GRB 050502: ROTSE-III Detection of Possible Counterpart
  47. Swift/BAT possible detection of a weak burst GRB050430
  48. GRB050416a: Radio Detection
  49. GRB 050422: Swift-UVOT observation
  50. GRB 050422: Swift-BAT refined analysis
  51. Swift Detection of GRB 050422
  52. GRB 050421: SLOTIS observations
  53. GRB 050421: Further Analysis of IR imaging
  54. GRB050421: Radio Observations
  55. GRB050421: Radio Observations
  56. GRB 050421: IR Observations
  57. GRB 050421: Swift-BAT refined analysis
  58. GRB050421
  59. GRB 050421: early Swift XRT analysis results
  60. GRB 050421: NIR observations
  61. GRB050421: P60 Observations
  62. GRB 050421: BOOTES-2 simultaneous optical observations
  63. GRB 050416b: Tentative Swift XRT Position
  64. GRB 050315: potential host galaxy
  65. GRB050326: analysis of the XMM-Newton observation
  66. GRB050418: Null Optical Observations
  67. GRB050416A, optical observations
  68. GRB 050418: Swift-BAT refined analysis
  69. GRB 050416: Mitsume optical observation
  70. GRB050416B: IR observations
  71. GRB050412: Radio Observations
  72. GRB 050416: Swift/UVOT detection of afterglow emission
  73. GRB050416: Refined Swift-XRT analysis
  74. GRB 050416,optical observation
  75. GRB050416: P200 NIR Observations
  76. GRB 050416: Radio observations
  77. Swift BAT/XRT Detection of GRB 050416
  78. GRB 050412: PROMPT VRcIc Observations
  79. GRB 050408: Kuiper 1.5m observations
  80. GRB 050412: early Swift XRT analysis results
  81. GRB 050412: Early Optical/Ultraviolet Observations with
  82. GRB 050408: SDSS Field Calibration
  83. GRB050412: P60 Observations
  84. GRB 050412: Swift XRT Position
  85. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  86. GRB 050412: IR and Optical observations
  87. GRB 050412: IR Observations
  88. GRB050408: Radio Observations
  89. GRB 050401: Optical limit
  90. GRB050410: P60 Observations
  91. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  92. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  93. GRB050410: Radio Observations
  94. GRB050410: MASTER optical observations
  95. GRB 050410: Early observations with Swift-UVOT
  96. Swift-BAT detection of GRB 050410
  97. GRB 050408: Inconsistency of host galaxy identification
  98. GRB 050408: Subaru Observations
  99. GRB 050408: WIDGET simultaneous optical observations
  100. GRB 050408: Properties of the Host Galaxy

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