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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"

38581 results found.

  1. GRB 050505: SARA Observations
  2. Swift UVOT Follow-up Observations of GRB 050509B
  3. GRB 050509B, Optical Observations
  4. GRB 050509B: Swift/XRT refined analysis
  5. GRB050509a: Swift UVOT observations
  6. GRB 050509b: Possible Optical Counterpart
  7. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  8. GRB 050509A: Optical observations
  9. GRB 050509b: Optical Counterpart Candidate
  10. GRB050509b: Radio Observations
  11. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  12. GRB 050509b: Swift XRT Position
  13. GRB 050509B: ROTSE-III Optical Limits
  14. Swift Detection of GRB050509b: A short duration burst
  15. GRB 050509a: Swift XRT Position
  16. Swift Detection of the Burst GRB050509
  17. Swift-BAT detection of GRB 050507
  18. GRB 050505: Keck I-band Magnitude
  19. GRB 050505: early time observations
  20. GRB 050505 - Faulkes Telescope North observations
  21. GRB 050502a: Swift XRT Upper Limit
  22. GRB050505: Infrared observations
  23. GRB 050505: Further Swift UVOT observations.
  24. GRB050505: AAVSO observations
  25. GRB050416A : 1 GHz limit from GMRT
  26. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  27. GRB 050505 UVOT
  28. GRB050505: Optical Afterglow Candidate
  29. GRB 050505: Swift XRT Position
  30. GRB050505 Swift-BAT refined analysis
  31. GRB 050502a: Optical Observations
  32. GRB 050416b:Swift XRT afterglow upper limits
  33. GRB 050416b:Swift XRT afterglow upper limits
  34. Swift-BAT detection of GRB050505
  35. GRB 050504: Swift XRT position
  36. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  37. GRB050502b: Afterglow Confirmation
  38. GRB050502: P200 Observations (Correction)
  39. GRB050502: P200 Observations
  40. GRB 050504 : R band observation at Lulin observatory
  41. Swift UVOT observation of GRB 050504
  42. GRB 050504, R band Observations
  43. GRB050504: Faulkes North optical robotic limit
  44. GRB 050502b, V band Observations
  45. GRB050504: P60 Observations
  46. GRB 050504: A long GRB detected with INTEGRAL
  47. GRB 050502b, Optical observations
  48. GRB050502a: P60 Observations (Correction)
  49. GRB050502a: P60 Observations
  50. Renewal of SGR 1806-20 activity
  51. GRB 050502a: RBO Observations
  52. GRB 050502A: WSRT Radio Observations
  53. GRB050502A: Optical Observations
  54. GRB050502B Swift-BAT refined analysis
  55. GRB050502B: I band source in XRT error circle
  56. Swift UVOT refined analysis
  57. Retraction of Swift-BAT trigger 116145
  58. GRB 050502a : R band observation at Lulin observatory
  59. GRB 050502b : optical observation at Lulin observatory
  60. GRB 050502b: Swift XRT Position
  61. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  62. GRB050502B: Optical Limits from ANU 1m
  63. Swift Detection of the Bright Burst GRB050502b
  64. GRB 050502: INTEGRAL results
  65. GRB050502: ANU 1m optical Observations
  66. GRB 050502: Confirmed variability of the afterglow candidate +
  67. GRB 050502: PAIRITEL IR Observations
  68. GRB050502 - Correction on the Optical Candidate from the Liverpool
  69. GRB 050502 - A long GRB detected with INTEGRAL
  70. GRB 050502: ROTSE-III Detection of Possible Counterpart
  71. Swift-BAT Trigger 115881 is not a real GRB
  72. Swift/BAT possible detection of a weak burst GRB050430
  73. GRB 050401: Rc observation
  74. GRB050416a: Radio Detection
  75. GRB 050422: Swift-UVOT observation
  76. GRB 050422: Swift-BAT refined analysis
  77. GRB 050422: Swift XRT Position
  78. Swift Detection of GRB 050422
  79. GRB 050421: NIR observations
  80. GRB 050416: Optical/NIR observations
  81. GRB 050421: SLOTIS observations
  82. GRB 050421: Further Analysis of IR imaging
  83. GRB050421: Radio Observations
  84. GRB050421: Radio Observations
  85. GRB 050421: Swift-UVOT observation
  86. GRB 050421: IR Observations
  87. GRB 050421: Swift-BAT refined analysis
  88. GRB 050421: ROTSE-III Optical Limits
  89. GRB 050421: NIR observations re-examination
  90. GRB050421
  91. GRB 050421: early Swift XRT analysis results
  92. GRB 050421: NIR observations
  93. GRB050421: P60 Observations
  94. GRB 050421: Optical observations at the INT
  95. Swift Detection of GRB050421
  96. GRB 050416b: Tentative Swift XRT Position
  97. GRB 050315: potential host galaxy
  98. GRB050326: analysis of the XMM-Newton observation
  99. GRB050418: Null Optical Observations
  100. GRB 050412: Chandra observations

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