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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"

22212 results found.

  1. GRB 050520: TAROT optical limit
  2. GRB 050520: Swift XRT position
  3. GRB 050520: VLT/ULTRACAM observations
  4. GRB 050520: OSN optical observations
  5. GRB 050504: Swift XRT afterglow candidate has faded
  6. XRF 050509c optical afterglow
  7. GRB 050509B and short GRB-SN association? (corrected)
  8. GRB 050509B and short GRB-SN association?
  9. GRB 050509B: Subaru Optical Observations
  10. GRB050509b, Bok telescope B-band imaging
  11. GRB050509b, SDSS pre-burst observations
  12. GRB 050509b: Keck/Chandra Cross-Correlation
  13. Chandra observation of GRB 050509b
  14. GRB050509B: Optical/Infared observations
  15. GRB 050509b Milagro GeV/TeV Observations
  16. GRB050509B: Optical observations at the Very Large Telescope
  17. GRB 050509b: No Optical Variability in XRT Error Circle
  18. GRB 050509B: WSRT Radio Observations
  19. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  20. GRB 050505, early TAROT observation
  21. GRB050509c: REM NIR and Optical observations
  22. GRB 050505: SARA Observations
  23. Swift UVOT Follow-up Observations of GRB 050509B
  24. GRB 050509B, Optical Observations
  25. GRB050509a: Swift UVOT observations
  26. GRB 050509b: Optical observations
  27. GRB 050509b: Possible Optical Counterpart
  28. GRB 050509A: Optical observations
  29. GRB050509b: Radio Observations
  30. GRB 050509b: PAIRITEL and WIYN Observations
  31. GRB 050509b: optical observations
  32. GRB 050509b: Swift XRT Position
  33. Swift Detection of GRB050509b: A short duration burst
  34. Swift Detection of the Burst GRB050509
  35. GRB 050505: early time observations
  36. GRB 050505 - Faulkes Telescope North observations
  37. GRB 050502a: Swift XRT Upper Limit
  38. GRB050505: Infrared observations
  39. GRB 050505: Further Swift UVOT observations.
  40. GRB050505: AAVSO observations
  41. GRB 050505 UVOT
  42. GRB050505: Optical Afterglow Candidate
  43. GRB050505 Swift-BAT refined analysis
  44. GRB 050502a: Optical Observations
  45. GRB 050416b:Swift XRT afterglow upper limits
  46. GRB 050416b:Swift XRT afterglow upper limits
  47. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  48. GRB050502b: Afterglow Confirmation
  49. GRB050502: P200 Observations (Correction)
  50. GRB050502: P200 Observations
  51. GRB 050504 : R band observation at Lulin observatory
  52. GRB 050504, R band Observations
  53. GRB050504: Faulkes North optical robotic limit
  54. GRB 050502b, V band Observations
  55. GRB050504: P60 Observations
  56. GRB (?) 050504: IR Observations, Intriguing Source
  57. GRB 050502b, Optical observations
  58. GRB050502a: P60 Observations (Correction)
  59. GRB050502a: P60 Observations
  60. Renewal of SGR 1806-20 activity
  61. GRB 050502a: RBO Observations
  62. GRB 050502A: WSRT Radio Observations
  63. GRB050502A: Optical Observations
  64. GRB050502B Swift-BAT refined analysis
  65. GRB 050502b : optical observation at Lulin observatory
  66. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  67. Swift Detection of the Bright Burst GRB050502b
  68. GRB050502: ANU 1m optical Observations
  69. GRB 050502: PAIRITEL IR Observations
  70. GRB 050502: ROTSE-III Detection of Possible Counterpart
  71. Swift/BAT possible detection of a weak burst GRB050430
  72. GRB050416a: Radio Detection
  73. Swift Detection of GRB 050422
  74. GRB 050421: NIR observations
  75. GRB 050416: Optical/NIR observations
  76. GRB 050421: SLOTIS observations
  77. GRB 050421: Further Analysis of IR imaging
  78. GRB050421: Radio Observations
  79. GRB050421: Radio Observations
  80. GRB 050421: IR Observations
  81. GRB 050421: ROTSE-III Optical Limits
  82. GRB 050421: NIR observations re-examination
  83. GRB 050421: NIR observations
  84. GRB050421: P60 Observations
  85. GRB 050421: BOOTES-2 simultaneous optical observations
  86. GRB 050421: Optical observations at the INT
  87. Swift Detection of GRB050421
  88. GRB 050416b: Tentative Swift XRT Position
  89. GRB 050315: potential host galaxy
  90. GRB050418: Null Optical Observations
  91. GRB 050412: Chandra observations
  92. GRB050416A, optical observations
  93. GRB 050416 : optical observation at Xinglong observatory
  94. GRB 050416B: optical observations
  95. GRB 050416b: LCO observations
  96. GRB 050416b: LCO observations
  97. GRB050416B: IR observations
  98. GRB050412: Radio Observations
  99. GRB 050416: Swift/UVOT detection of afterglow emission
  100. GRB050416: Maidanak optical observations

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