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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"

23687 results found.

  1. GRB 060206 : Lulin optical observations
  2. GRB060206: SDSS Pre-Burst Observations
  3. GRB060206: Liverpool Telescope observation
  4. GRB060206: P60 Optical Observations
  5. GRB 060206: KAIT observations
  6. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  7. GRB060204C: optical observation
  8. GRB 060204A: FRAM optical observations
  9. GRB 060204b: Keck/LRIS Afterglow Confirmation
  10. GRB 060204C: BOOTES-IR optical limits
  11. GRB 060204C: Liverpool Telescopes optical limit
  12. GRB060204B: Faulkes OT candidate
  13. GRB060204B, optical observation
  14. GRB060204B - SDSS pre-burst observations
  15. GRB 060203: Swift-BAT refined analysis
  16. GRB 060204B: Swift detection of a burst
  17. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  18. GRB 060203: RTT150 optical observations
  19. GRB060203: Observations with SARA
  20. GRB 060203: P60 Confirmation of Optical Afterglow
  21. Swift BAT Trigger 180151: Swift XRT source detection
  22. GRB 060202: PROMPT Observations
  23. GRB 060202: Gemini-N J, H, K_s observations
  24. GRB 060202 : Kiso B and R band limit
  25. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  26. GRB 060202 : Lulin R and I band limit
  27. GRB060202: Faulkes North observation
  28. GRB 060202: Swift detection of a burst
  29. GRB 060130: PROMPT Observations
  30. GRB 060123: Gemini spectroscopy of the putative host galaxy
  31. GRB 060130, SMARTS optical observations
  32. GRB 060130: a long GRB detected with INTEGRAL
  33. GRB050121: optical observation
  34. GRB050121b: optical observation
  35. GRB 060121: Confirmation of NIR Afterglow
  36. GRB060124: optical observation
  37. GRB060124: optical observations
  38. GRB 060123: Swift refined analysis of an unusual GRB
  39. GRB060124, BVRcIc field calibration
  40. GRB060105: refined analysis of the Suzaku observation
  41. GRB 060121: Probable Detection of NIR Afterglow
  42. GRB060124: optical observation
  43. GRB 060124: HETE detection and spectrum of the main peak
  44. Refined XRT Position for GRB 060123
  45. Konus-Wind observation of GRB 060124
  46. GRB 060124 Optical Observations
  47. GRB 060124: ART optical limits during the burst
  48. GRB 060124: Keck Absorption Redshift
  49. GRB 060124 : Optical observation at Xinglong and Kiso
  50. GRB060124: optical observations at Asiago
  51. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  52. GRB060123: SDSS pre-burst observations
  53. GRB 060123: Swift detection of a very long, faint burst
  54. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  55. GRB 060124: TAROT optical limits
  56. GRB 060124: Confirmation of the Afterglow
  57. GRB 050124 : Kiso Optical limit
  58. GRB 060124: Optical Observations at Tautenburg
  59. GRB060124:MASTER optical observation
  60. GRB 060111B: Suzaku WAM observation of the prompt emission
  61. GRB 060121: Swift/UVOT upper limits
  62. GRB 060121: Swift XRT refined analysis
  63. Konus-Wind observation of GRB 060121
  64. GRB 060121: I-band Limits
  65. GRB 060121: candidate optical counterpart
  66. GRB 060121: Swift XRT refined position
  67. GRB060121: SARA Observations
  68. GRB 060121: optical observations
  69. GRB060121 - SDSS pre-burst observations
  70. GRB 060121 (=H4010): Results of preliminary spectral analysis
  71. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  72. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  73. GRB 060117: PROMPT Observations
  74. GRB 060116: photometric redshift - the farthest GRB?
  75. GRB 060116: possible I-J dropout
  76. GRB 060116: PROMPT Observations
  77. GRB 060117: Swift-BAT detection of a bright burst
  78. GRB 060116: Refined analysis of the Swift-BAT burst
  79. GRB 060115: PROMPT Observations
  80. GRB 060116: XRT refined analysis
  81. GRB 060116: Swift/UVOT upper limits
  82. GRB 060116 : Lulin optical limit
  83. GRB060116: XRT position
  84. GRB060116: Faulkes North observation
  85. GRB 060116: Swift-BAT detection of a burst
  86. GRB 060115: Refined analysis of the Swift-BAT burst
  87. GRB 060115: Swift/UVOT upper limits
  88. GRB 060114: REM observations
  89. GRB 060115: Swift XRT refined analysis
  90. GRB 060115: MITSuME optical afterglow candidate
  91. GRB 060115: Swift detection of a burst
  92. GRB 060114: Swift XRT upper limit
  93. GRB 060114: A long GRB detected by INTEGRAL
  94. GRB060114: Faulkes North observation
  95. GRB060108: Faulkes North afterglow evidence
  96. GRB 060110: KAIT observations
  97. GRB 060111B: Swift XRT refined analysis
  98. GRB 060111A: refined UVOT anaysis
  99. GRB 060111B: TAROT optical observation
  100. GRB060111A: RTT150 optical observations

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