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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"

23707 results found.

  1. GRB060211B: Swift/XRT position
  2. GRB 060210: Optical Observations
  3. GRB060211: Faulkes North observation
  4. GRB060206, optical observations
  5. GRB 060210 : Xinglong and Lulin optical limit
  6. GRB060210: Optical Observations
  7. GRB060210: Early Optical Observations
  8. GRB060210:Faulkes Telescope North Afterglow Confirmation
  9. GRB 060210: candidate afterglow
  10. GRB060209: RTT150 optical observations
  11. GRB 060209 : TAROT optical observation
  12. GRB060209A: MASTER optical observation
  13. GRB 060206: TTT Observations
  14. GRB 060206: More PROMPT Detections
  15. GRB 060121 : WIDGET Pre-trigger limit
  16. GRB 060206: Tenagra II Observations
  17. GRB 060206: PROMPT Detections
  18. GRB 060206: Subaru/FOCAS optical spectroscopy
  19. GRB 060206: Lick 3m Spectroscopy
  20. GRB 060206: Swift-BAT refined analysis
  21. GRB 060206 : Lulin optical observations
  22. GRB060206: SDSS Pre-Burst Observations
  23. GRB060206: Liverpool Telescope observation
  24. GRB060206: P60 Optical Observations
  25. GRB 060206: KAIT observations
  26. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  27. GRB060204C: optical observation
  28. GRB 060204A: FRAM optical observations
  29. GRB 060204b: Keck/LRIS Afterglow Confirmation
  30. GRB 060204C: BOOTES-IR optical limits
  31. GRB 060204C: Liverpool Telescopes optical limit
  32. GRB060204B: Faulkes OT candidate
  33. GRB060204B, optical observation
  34. GRB060204B - SDSS pre-burst observations
  35. GRB 060203: Swift-BAT refined analysis
  36. GRB 060204B: Swift detection of a burst
  37. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  38. GRB 060203: RTT150 optical observations
  39. GRB060203: Observations with SARA
  40. GRB 060203: P60 Confirmation of Optical Afterglow
  41. Swift BAT Trigger 180151: Swift XRT source detection
  42. GRB 060202: PROMPT Observations
  43. GRB 060202: Gemini-N J, H, K_s observations
  44. GRB 060202 : Kiso B and R band limit
  45. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  46. GRB 060202 : Lulin R and I band limit
  47. GRB060202: Faulkes North observation
  48. GRB 060202: Swift detection of a burst
  49. GRB 060130: PROMPT Observations
  50. GRB 060123: Gemini spectroscopy of the putative host galaxy
  51. GRB 060130, SMARTS optical observations
  52. GRB 060130: a long GRB detected with INTEGRAL
  53. GRB050121: optical observation
  54. GRB050121b: optical observation
  55. GRB 060121: Confirmation of NIR Afterglow
  56. GRB060124: optical observation
  57. GRB060124: optical observations
  58. GRB 060123: Swift refined analysis of an unusual GRB
  59. GRB060124, BVRcIc field calibration
  60. GRB060105: refined analysis of the Suzaku observation
  61. GRB 060121: Probable Detection of NIR Afterglow
  62. GRB060124: optical observation
  63. GRB 060124: HETE detection and spectrum of the main peak
  64. Refined XRT Position for GRB 060123
  65. Konus-Wind observation of GRB 060124
  66. GRB 060124 Optical Observations
  67. GRB 060124: ART optical limits during the burst
  68. GRB 060124: Keck Absorption Redshift
  69. GRB 060124 : Optical observation at Xinglong and Kiso
  70. GRB060124: optical observations at Asiago
  71. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  72. GRB060123: SDSS pre-burst observations
  73. GRB 060123: Swift detection of a very long, faint burst
  74. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  75. GRB 060124: TAROT optical limits
  76. GRB 060124: Confirmation of the Afterglow
  77. GRB 050124 : Kiso Optical limit
  78. GRB 060124: Optical Observations at Tautenburg
  79. GRB060124:MASTER optical observation
  80. GRB 060111B: Suzaku WAM observation of the prompt emission
  81. GRB 060121: Swift/UVOT upper limits
  82. GRB 060121: Swift XRT refined analysis
  83. Konus-Wind observation of GRB 060121
  84. GRB 060121: I-band Limits
  85. GRB 060121: candidate optical counterpart
  86. GRB 060121: Swift XRT refined position
  87. GRB060121: SARA Observations
  88. GRB 060121: optical observations
  89. GRB060121 - SDSS pre-burst observations
  90. GRB 060121 (=H4010): Results of preliminary spectral analysis
  91. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  92. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  93. GRB 060117: PROMPT Observations
  94. GRB 060116: photometric redshift - the farthest GRB?
  95. GRB 060116: possible I-J dropout
  96. GRB 060116: PROMPT Observations
  97. GRB 060117: Swift-BAT detection of a bright burst
  98. GRB 060116: Refined analysis of the Swift-BAT burst
  99. GRB 060115: PROMPT Observations
  100. GRB 060116: XRT refined analysis

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