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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"

32756 results found.

  1. GRB 050509B and short GRB-SN association?
  2. GRB 050509B: Subaru Optical Observations
  3. GRB050502b: Early Observation
  4. GRB050509b, Bok telescope B-band imaging
  5. Refined Chandra analysis of GRB 050509b
  6. GRB050509b, SDSS pre-burst observations
  7. GRB 050509b: Keck/Chandra Cross-Correlation
  8. Chandra observation of GRB 050509b
  9. GRB 050509b: RAPTOR deep, early limits.
  10. GRB050509B: Optical/Infared observations
  11. GRB 050509b: Swift/UVOT follow-up measurements
  12. GRB 050509b Milagro GeV/TeV Observations
  13. GRB050509B: Optical observations at the Very Large Telescope
  14. GRB 050509b: No Optical Variability in XRT Error Circle
  15. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  16. GRB 050509a: Swift-BAT refined analysis
  17. GRB 050509c: ROTSE-III Optical Limits
  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 (=H3751): An X-Ray Flash Localized By HETE
  22. GRB 050509b: Further Analysis of Keck LRIS Images
  23. GRB 050509b: Physical Properties of the Candidate Host galaxy
  24. GRB 050505: SARA Observations
  25. Swift UVOT Follow-up Observations of GRB 050509B
  26. GRB 050509B, Optical Observations
  27. GRB 050509B: Swift/XRT refined analysis
  28. GRB050509a: Swift UVOT observations
  29. GRB 050509b: Optical observations
  30. GRB 050509b: Precision Astrometry
  31. GRB 050509b: Possible Optical Counterpart
  32. GRB 050509A: Optical observations
  33. GRB 050509b: Optical Counterpart Candidate
  34. GRB050509b: Radio Observations
  35. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  36. GRB 050509b: optical observations
  37. GRB 050509b: Swift XRT Position
  38. GRB 050509B: ROTSE-III Optical Limits
  39. GRB 050509a: Swift XRT Position
  40. GRB 050505: Keck I-band Magnitude
  41. GRB 050505: early time observations
  42. GRB 050502a: Swift XRT Upper Limit
  43. GRB 050505, simultaneous optical observation
  44. GRB050505: Infrared observations
  45. GRB 050505: Further Swift UVOT observations.
  46. GRB050505: AAVSO observations
  47. GRB050416A : 1 GHz limit from GMRT
  48. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  49. GRB 050505 UVOT
  50. GRB050505: Optical Afterglow Candidate
  51. GRB 050505: Swift XRT Position
  52. GRB050505 Swift-BAT refined analysis
  53. GRB 050502a: Optical Observations
  54. GRB 050416b:Swift XRT afterglow upper limits
  55. GRB 050416b:Swift XRT afterglow upper limits
  56. Swift-BAT detection of GRB050505
  57. GRB 050504: Swift XRT position
  58. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  59. GRB050502b: Afterglow Confirmation
  60. GRB050502: P200 Observations (Correction)
  61. GRB050502: P200 Observations
  62. GRB 050504 : R band observation at Lulin observatory
  63. Swift UVOT observation of GRB 050504
  64. GRB 050504, R band Observations
  65. GRB050504: P60 Observations
  66. GRB 050502b, Optical observations
  67. GRB050502a: P60 Observations (Correction)
  68. GRB050502a: P60 Observations
  69. GRB 050502a: RBO Observations
  70. GRB 050502A: WSRT Radio Observations
  71. GRB050502A: Optical Observations
  72. GRB050502B Swift-BAT refined analysis
  73. GRB050502B: I band source in XRT error circle
  74. Swift UVOT refined analysis
  75. Retraction of Swift-BAT trigger 116145
  76. GRB 050502a : R band observation at Lulin observatory
  77. GRB 050502b : optical observation at Lulin observatory
  78. GRB 050502b: Swift XRT Position
  79. GRB050502B: Optical Limits from ANU 1m
  80. GRB 050502: INTEGRAL results
  81. GRB050502: ANU 1m optical Observations
  82. GRB 050502: Confirmed variability of the afterglow candidate +
  83. GRB 050502: PAIRITEL IR Observations
  84. GRB 050502: ROTSE-III Detection of Possible Counterpart
  85. Swift-BAT Trigger 115881 is not a real GRB
  86. Swift/BAT possible detection of a weak burst GRB050430
  87. GRB 050401: Rc observation
  88. GRB050416a: Radio Detection
  89. GRB 050422: Swift-UVOT observation
  90. GRB 050422: Swift-BAT refined analysis
  91. GRB 050422: Swift XRT Position
  92. GRB 050421: NIR observations
  93. GRB 050416: Optical/NIR observations
  94. GRB 050421: SLOTIS observations
  95. GRB 050421: Further Analysis of IR imaging
  96. GRB050421: Radio Observations
  97. GRB050421: Radio Observations
  98. GRB 050421: Swift-UVOT observation
  99. GRB 050421: IR Observations
  100. GRB 050421: Swift-BAT refined analysis

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