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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"

32568 results found.

  1. GRB 050520: P200 Observations
  2. GRB050520: Liverpool Telescope follow-up
  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. No Swift-BAT Lightcurves in real-time for next 3 weeks
  8. Swift-BAT trigger 122203 is not a real GRB
  9. XRF 050509C: REM NIR and Optical refined analysis
  10. GRB 050504: Swift XRT afterglow candidate has faded
  11. XRF 050509c optical afterglow
  12. GRB 050509B and short GRB-SN association? (corrected)
  13. GRB 050509B and short GRB-SN association?
  14. GRB 050509B: Subaru Optical Observations
  15. GRB050502b: Early Observation
  16. GRB050509b, Bok telescope B-band imaging
  17. Refined Chandra analysis of GRB 050509b
  18. GRB050509b, SDSS pre-burst observations
  19. GRB 050509b: Keck/Chandra Cross-Correlation
  20. Chandra observation of GRB 050509b
  21. GRB 050509b: RAPTOR deep, early limits.
  22. GRB050509B: Optical/Infared observations
  23. GRB 050509b: Swift/UVOT follow-up measurements
  24. GRB 050509b Milagro GeV/TeV Observations
  25. GRB050509B: Optical observations at the Very Large Telescope
  26. GRB 050509b: No Optical Variability in XRT Error Circle
  27. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  28. GRB 050509a: Swift-BAT refined analysis
  29. GRB 050509c: ROTSE-III Optical Limits
  30. GRB 050509B: WSRT Radio Observations
  31. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  32. GRB 050505, early TAROT observation
  33. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  34. GRB 050509b: Further Analysis of Keck LRIS Images
  35. GRB 050509b: Physical Properties of the Candidate Host galaxy
  36. GRB 050505: SARA Observations
  37. Swift UVOT Follow-up Observations of GRB 050509B
  38. GRB 050509B, Optical Observations
  39. GRB 050509B: Swift/XRT refined analysis
  40. GRB050509a: Swift UVOT observations
  41. GRB 050509b: Optical observations
  42. GRB 050509b: Precision Astrometry
  43. GRB 050509b: Possible Optical Counterpart
  44. GRB 050509A: Optical observations
  45. GRB 050509b: Optical Counterpart Candidate
  46. GRB050509b: Radio Observations
  47. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  48. GRB 050509b: optical observations
  49. GRB 050509b: Swift XRT Position
  50. GRB 050509B: ROTSE-III Optical Limits
  51. GRB 050509a: Swift XRT Position
  52. GRB 050505: Keck I-band Magnitude
  53. GRB 050505: early time observations
  54. GRB 050502a: Swift XRT Upper Limit
  55. GRB 050505, simultaneous optical observation
  56. GRB050505: Infrared observations
  57. GRB 050505: Further Swift UVOT observations.
  58. GRB050505: AAVSO observations
  59. GRB050416A : 1 GHz limit from GMRT
  60. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  61. GRB 050505 UVOT
  62. GRB050505: Optical Afterglow Candidate
  63. GRB 050505: Swift XRT Position
  64. GRB050505 Swift-BAT refined analysis
  65. GRB 050502a: Optical Observations
  66. GRB 050416b:Swift XRT afterglow upper limits
  67. GRB 050416b:Swift XRT afterglow upper limits
  68. Swift-BAT detection of GRB050505
  69. GRB 050504: Swift XRT position
  70. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  71. GRB050502b: Afterglow Confirmation
  72. GRB050502: P200 Observations (Correction)
  73. GRB050502: P200 Observations
  74. GRB 050504 : R band observation at Lulin observatory
  75. Swift UVOT observation of GRB 050504
  76. GRB 050504, R band Observations
  77. GRB050504: P60 Observations
  78. GRB 050502b, Optical observations
  79. GRB050502a: P60 Observations (Correction)
  80. GRB050502a: P60 Observations
  81. GRB 050502a: RBO Observations
  82. GRB 050502A: WSRT Radio Observations
  83. GRB050502A: Optical Observations
  84. GRB050502B Swift-BAT refined analysis
  85. GRB050502B: I band source in XRT error circle
  86. Swift UVOT refined analysis
  87. Retraction of Swift-BAT trigger 116145
  88. GRB 050502a : R band observation at Lulin observatory
  89. GRB 050502b : optical observation at Lulin observatory
  90. GRB 050502b: Swift XRT Position
  91. GRB050502B: Optical Limits from ANU 1m
  92. GRB 050502: INTEGRAL results
  93. GRB050502: ANU 1m optical Observations
  94. GRB 050502: Confirmed variability of the afterglow candidate +
  95. GRB 050502: PAIRITEL IR Observations
  96. GRB 050502: ROTSE-III Detection of Possible Counterpart
  97. Swift-BAT Trigger 115881 is not a real GRB
  98. Swift/BAT possible detection of a weak burst GRB050430
  99. GRB 050401: Rc observation
  100. GRB050416a: Radio Detection

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