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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"

22214 results found.

  1. GRB 050520: P200 Observations
  2. RBO Observations of GRB050520
  3. GRB 050520: TAROT optical limit
  4. GRB 050520: Swift XRT position
  5. GRB 050520: VLT/ULTRACAM observations
  6. GRB 050520: OSN optical observations
  7. GRB 050504: Swift XRT afterglow candidate has faded
  8. XRF 050509c optical afterglow
  9. GRB 050509B and short GRB-SN association? (corrected)
  10. GRB 050509B and short GRB-SN association?
  11. GRB 050509B: Subaru Optical Observations
  12. GRB050509b, Bok telescope B-band imaging
  13. GRB050509b, SDSS pre-burst observations
  14. GRB 050509b: Keck/Chandra Cross-Correlation
  15. Chandra observation of GRB 050509b
  16. GRB050509B: Optical/Infared observations
  17. GRB 050509b Milagro GeV/TeV Observations
  18. GRB050509B: Optical observations at the Very Large Telescope
  19. GRB 050509b: No Optical Variability in XRT Error Circle
  20. GRB 050509B: WSRT Radio Observations
  21. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  22. GRB 050505, early TAROT observation
  23. GRB050509c: REM NIR and Optical observations
  24. GRB 050505: SARA Observations
  25. Swift UVOT Follow-up Observations of GRB 050509B
  26. GRB 050509B, Optical Observations
  27. GRB050509a: Swift UVOT observations
  28. GRB 050509b: Optical observations
  29. GRB 050509b: Possible Optical Counterpart
  30. GRB 050509A: Optical observations
  31. GRB050509b: Radio Observations
  32. GRB 050509b: PAIRITEL and WIYN Observations
  33. GRB 050509b: optical observations
  34. GRB 050509b: Swift XRT Position
  35. Swift Detection of GRB050509b: A short duration burst
  36. Swift Detection of the Burst GRB050509
  37. GRB 050505: early time observations
  38. GRB 050505 - Faulkes Telescope North observations
  39. GRB 050502a: Swift XRT Upper Limit
  40. GRB050505: Infrared observations
  41. GRB 050505: Further Swift UVOT observations.
  42. GRB050505: AAVSO observations
  43. GRB 050505 UVOT
  44. GRB050505: Optical Afterglow Candidate
  45. GRB050505 Swift-BAT refined analysis
  46. GRB 050502a: Optical Observations
  47. GRB 050416b:Swift XRT afterglow upper limits
  48. GRB 050416b:Swift XRT afterglow upper limits
  49. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  50. GRB050502b: Afterglow Confirmation
  51. GRB050502: P200 Observations (Correction)
  52. GRB050502: P200 Observations
  53. GRB 050504 : R band observation at Lulin observatory
  54. GRB 050504, R band Observations
  55. GRB050504: Faulkes North optical robotic limit
  56. GRB 050502b, V band Observations
  57. GRB050504: P60 Observations
  58. GRB (?) 050504: IR Observations, Intriguing Source
  59. GRB 050502b, Optical observations
  60. GRB050502a: P60 Observations (Correction)
  61. GRB050502a: P60 Observations
  62. Renewal of SGR 1806-20 activity
  63. GRB 050502a: RBO Observations
  64. GRB 050502A: WSRT Radio Observations
  65. GRB050502A: Optical Observations
  66. GRB050502B Swift-BAT refined analysis
  67. GRB 050502b : optical observation at Lulin observatory
  68. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  69. Swift Detection of the Bright Burst GRB050502b
  70. GRB050502: ANU 1m optical Observations
  71. GRB 050502: PAIRITEL IR Observations
  72. GRB 050502: ROTSE-III Detection of Possible Counterpart
  73. Swift/BAT possible detection of a weak burst GRB050430
  74. GRB050416a: Radio Detection
  75. Swift Detection of GRB 050422
  76. GRB 050421: NIR observations
  77. GRB 050416: Optical/NIR observations
  78. GRB 050421: SLOTIS observations
  79. GRB 050421: Further Analysis of IR imaging
  80. GRB050421: Radio Observations
  81. GRB050421: Radio Observations
  82. GRB 050421: IR Observations
  83. GRB 050421: ROTSE-III Optical Limits
  84. GRB 050421: NIR observations re-examination
  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 050416 : optical observation at Xinglong observatory
  96. GRB 050416B: optical observations
  97. GRB 050416b: LCO observations
  98. GRB 050416b: LCO observations
  99. GRB050416B: IR observations
  100. GRB050412: Radio Observations

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