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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"

36243 results found.

  1. GRB 050509B: WSRT Radio Observations
  2. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  3. GRB 050505, early TAROT observation
  4. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  5. GRB 050509b: Further Analysis of Keck LRIS Images
  6. GRB050509c: REM NIR and Optical observations
  7. GRB 050509b: Physical Properties of the Candidate Host galaxy
  8. GRB 050505: SARA Observations
  9. Swift UVOT Follow-up Observations of GRB 050509B
  10. GRB 050509B, Optical Observations
  11. GRB 050509B: Swift/XRT refined analysis
  12. GRB 050509b: Optical observations
  13. GRB 050509b: Precision Astrometry
  14. GRB 050509b: Possible Optical Counterpart
  15. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  16. GRB 050509A: Optical observations
  17. GRB 050509b: Optical Counterpart Candidate
  18. GRB 050509b: PAIRITEL and WIYN Observations
  19. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  20. GRB 050509b: optical observations
  21. GRB 050509b: Swift XRT Position
  22. GRB 050509B: ROTSE-III Optical Limits
  23. GRB 050509a: Swift XRT Position
  24. Swift-BAT detection of GRB 050507
  25. GRB 050505: Keck I-band Magnitude
  26. GRB 050505: early time observations
  27. GRB 050505 - Faulkes Telescope North observations
  28. GRB 050502a: Swift XRT Upper Limit
  29. GRB 050505, simultaneous optical observation
  30. GRB 050505: Further Swift UVOT observations.
  31. GRB050505: AAVSO observations
  32. GRB050416A : 1 GHz limit from GMRT
  33. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  34. GRB 050505 UVOT
  35. GRB050505: Optical Afterglow Candidate
  36. GRB 050505: Swift XRT Position
  37. GRB 050502a: Optical Observations
  38. GRB 050416b:Swift XRT afterglow upper limits
  39. GRB 050416b:Swift XRT afterglow upper limits
  40. GRB 050504: Swift XRT position
  41. GRB050502: P200 Observations (Correction)
  42. GRB050502: P200 Observations
  43. GRB 050504 : R band observation at Lulin observatory
  44. Swift UVOT observation of GRB 050504
  45. GRB 050504, R band Observations
  46. GRB 050502b, V band Observations
  47. GRB050504: P60 Observations
  48. GRB 050504: A long GRB detected with INTEGRAL
  49. GRB (?) 050504: IR Observations, Intriguing Source
  50. GRB 050502b, Optical observations
  51. GRB050502a: P60 Observations (Correction)
  52. GRB050502a: P60 Observations
  53. Renewal of SGR 1806-20 activity
  54. GRB 050502a: RBO Observations
  55. GRB 050502A: WSRT Radio Observations
  56. GRB050502A: Optical Observations
  57. Swift UVOT refined analysis
  58. Retraction of Swift-BAT trigger 116145
  59. GRB 050502a : R band observation at Lulin observatory
  60. GRB 050502b : optical observation at Lulin observatory
  61. GRB 050502b: Swift XRT Position
  62. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  63. GRB 050502: INTEGRAL results
  64. GRB050502: ANU 1m optical Observations
  65. GRB 050502: Confirmed variability of the afterglow candidate +
  66. GRB 050502: PAIRITEL IR Observations
  67. GRB050502 - Correction on the Optical Candidate from the Liverpool
  68. GRB 050502 - A long GRB detected with INTEGRAL
  69. GRB 050502: ROTSE-III Detection of Possible Counterpart
  70. Swift-BAT Trigger 115881 is not a real GRB
  71. Swift/BAT possible detection of a weak burst GRB050430
  72. GRB 050401: Rc observation
  73. GRB050416a: Radio Detection
  74. GRB 050422: Swift-UVOT observation
  75. GRB 050422: Swift-BAT refined analysis
  76. GRB 050422: Swift XRT Position
  77. Swift Detection of GRB 050422
  78. GRB 050421: NIR observations
  79. GRB 050416: Optical/NIR observations
  80. GRB 050421: SLOTIS observations
  81. GRB 050421: Further Analysis of IR imaging
  82. GRB050421: Radio Observations
  83. GRB050421: Radio Observations
  84. GRB 050421: Swift-UVOT observation
  85. GRB 050421: IR Observations
  86. GRB 050421: Swift-BAT refined analysis
  87. GRB 050421: ROTSE-III Optical Limits
  88. GRB 050421: NIR observations re-examination
  89. GRB 050421: early Swift XRT analysis results
  90. GRB 050421: NIR observations
  91. GRB050421: P60 Observations
  92. GRB 050421: BOOTES-2 simultaneous optical observations
  93. GRB 050421: Optical observations at the INT
  94. GRB 050416b: Tentative Swift XRT Position
  95. GRB 050315: potential host galaxy
  96. GRB 050412: Chandra observations
  97. GRB050416A, optical observations
  98. GRB 050418: Swift-BAT refined analysis
  99. Swift-BAT detection of the bright and long GRB 050418
  100. GRB 050416: Mitsume optical observation

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