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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"

32764 results found.

  1. GRB 050520: VLT/ULTRACAM observations
  2. GRB 050520: OSN optical observations
  3. No Swift-BAT Lightcurves in real-time for next 3 weeks
  4. Swift-BAT trigger 122203 is not a real GRB
  5. XRF 050509C: REM NIR and Optical refined analysis
  6. GRB 050504: Swift XRT afterglow candidate has faded
  7. XRF 050509c optical afterglow
  8. GRB 050509B and short GRB-SN association? (corrected)
  9. GRB 050509B and short GRB-SN association?
  10. GRB 050509B: Subaru Optical Observations
  11. GRB050502b: Early Observation
  12. GRB050509b, Bok telescope B-band imaging
  13. Refined Chandra analysis of GRB 050509b
  14. GRB050509b, SDSS pre-burst observations
  15. GRB 050509b: Keck/Chandra Cross-Correlation
  16. Chandra observation of GRB 050509b
  17. GRB 050509b: RAPTOR deep, early limits.
  18. GRB050509B: Optical/Infared observations
  19. GRB 050509b: Swift/UVOT follow-up measurements
  20. GRB 050509b Milagro GeV/TeV Observations
  21. GRB050509B: Optical observations at the Very Large Telescope
  22. GRB 050509b: No Optical Variability in XRT Error Circle
  23. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  24. GRB 050509a: Swift-BAT refined analysis
  25. GRB 050509c: ROTSE-III Optical Limits
  26. GRB 050509B: WSRT Radio Observations
  27. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  28. GRB 050505, early TAROT observation
  29. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  30. GRB 050509b: Further Analysis of Keck LRIS Images
  31. GRB 050509b: Physical Properties of the Candidate Host galaxy
  32. GRB 050505: SARA Observations
  33. Swift UVOT Follow-up Observations of GRB 050509B
  34. GRB 050509B, Optical Observations
  35. GRB 050509B: Swift/XRT refined analysis
  36. GRB050509a: Swift UVOT observations
  37. GRB 050509b: Optical observations
  38. GRB 050509b: Precision Astrometry
  39. GRB 050509b: Possible Optical Counterpart
  40. GRB 050509A: Optical observations
  41. GRB 050509b: Optical Counterpart Candidate
  42. GRB050509b: Radio Observations
  43. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  44. GRB 050509b: optical observations
  45. GRB 050509b: Swift XRT Position
  46. GRB 050509B: ROTSE-III Optical Limits
  47. GRB 050509a: Swift XRT Position
  48. GRB 050505: Keck I-band Magnitude
  49. GRB 050505: early time observations
  50. GRB 050502a: Swift XRT Upper Limit
  51. GRB 050505, simultaneous optical observation
  52. GRB050505: Infrared observations
  53. GRB 050505: Further Swift UVOT observations.
  54. GRB050505: AAVSO observations
  55. GRB050416A : 1 GHz limit from GMRT
  56. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  57. GRB 050505 UVOT
  58. GRB050505: Optical Afterglow Candidate
  59. GRB 050505: Swift XRT Position
  60. GRB050505 Swift-BAT refined analysis
  61. GRB 050502a: Optical Observations
  62. GRB 050416b:Swift XRT afterglow upper limits
  63. GRB 050416b:Swift XRT afterglow upper limits
  64. Swift-BAT detection of GRB050505
  65. GRB 050504: Swift XRT position
  66. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  67. GRB050502b: Afterglow Confirmation
  68. GRB050502: P200 Observations (Correction)
  69. GRB050502: P200 Observations
  70. GRB 050504 : R band observation at Lulin observatory
  71. Swift UVOT observation of GRB 050504
  72. GRB 050504, R band Observations
  73. GRB050504: P60 Observations
  74. GRB 050502b, Optical observations
  75. GRB050502a: P60 Observations (Correction)
  76. GRB050502a: P60 Observations
  77. GRB 050502a: RBO Observations
  78. GRB 050502A: WSRT Radio Observations
  79. GRB050502A: Optical Observations
  80. GRB050502B Swift-BAT refined analysis
  81. GRB050502B: I band source in XRT error circle
  82. Swift UVOT refined analysis
  83. Retraction of Swift-BAT trigger 116145
  84. GRB 050502a : R band observation at Lulin observatory
  85. GRB 050502b : optical observation at Lulin observatory
  86. GRB 050502b: Swift XRT Position
  87. GRB050502B: Optical Limits from ANU 1m
  88. GRB 050502: INTEGRAL results
  89. GRB050502: ANU 1m optical Observations
  90. GRB 050502: Confirmed variability of the afterglow candidate +
  91. GRB 050502: PAIRITEL IR Observations
  92. GRB 050502: ROTSE-III Detection of Possible Counterpart
  93. Swift-BAT Trigger 115881 is not a real GRB
  94. Swift/BAT possible detection of a weak burst GRB050430
  95. GRB 050401: Rc observation
  96. GRB050416a: Radio Detection
  97. GRB 050422: Swift-UVOT observation
  98. GRB 050422: Swift-BAT refined analysis
  99. GRB 050422: Swift XRT Position
  100. GRB 050421: NIR observations

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