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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"

32762 results found.

  1. GRB 060204B: BVRi-band detections of optical afterglow
  2. GRB 060204A: Swift XRT upper limit
  3. GRB 060204A: FRAM optical observations
  4. GRB060204B: Swift/UVOT refined analysis
  5. GRB 060204C: optical observations
  6. Swift XRT Observation of GRB 060204C
  7. GRB 060204B: Swift-BAT refined analysis
  8. GRB 060204B: ART early limit
  9. GRB060204B: Swift XRT Team Refined Analysis
  10. GRB 060204C: OSN limits
  11. GRB 060204b: Keck/LRIS Afterglow Confirmation
  12. GRB 060204C: BOOTES-IR optical limits
  13. GRB 060204C: Liverpool Telescopes optical limit
  14. GRB 060204C: ROTSE-III Optical Limits
  15. GRB 060124: Radio Observations
  16. GRB060204B: Faulkes OT candidate
  17. GRB 060204B: ART optical limit
  18. GRB 060204A: further INTEGRAL results
  19. GRB060204B, optical observation
  20. GRB 060203: Swift-BAT refined analysis
  21. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  22. GRB 060203: RTT150 optical observations
  23. GRB060203 - Swift UVOT observation
  24. Swift-BAT trigger is GRB 060203
  25. GRB 060203: IR Counterpart
  26. GRB060203: Observations with SARA
  27. GRB 060203: P60 Confirmation of Optical Afterglow
  28. Possible GRB 060203: candidate optical counterpart
  29. Swift BAT Trigger 180151: Swift XRT source detection
  30. Possible GRB 060203: optical observations at Asiago
  31. GRB 060202: PROMPT Observations
  32. GRB 060202: GETS observation
  33. GRB 060202: Gemini-N J, H, K_s observations
  34. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  35. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  36. GRB 060202: Refined analysis of the Swift-BAT burst
  37. GRB060202, optical observation
  38. GRB 060202: Swift/UVOT upper limits
  39. GRB 060202: Swift XRT Team Refined Analysis
  40. GRB 060202 : Lulin R and I band limit
  41. GRB060202: Faulkes North observation
  42. GRB 060121: Gemini Late-time Observations
  43. GRB 060130: PROMPT Observations
  44. GRB060130: Further R-band imaging
  45. GRB 060130: Swift/XRT observation
  46. GRB 051211A: MDM Observations
  47. GRB 060123: VLA Radio Observations
  48. GRB060130: Optical imaging
  49. GRB060130: REM infrared observations
  50. GRB 060130, SMARTS optical observations
  51. GRB 060130: FRAM optical observations
  52. Possible GRB 051221B: MDM Correction
  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. GRB060124 optical observations
  61. GRB 060121: Probable Detection of NIR Afterglow
  62. GRB060124: optical observation
  63. GRB 060116 HST observations
  64. GRB 060124: HETE detection and spectrum of the main peak
  65. Refined XRT Position for GRB 060123
  66. Konus-Wind observation of GRB 060124
  67. GRB060124: detailed XRT analysis
  68. GRB 060124 Optical Observations
  69. GRB 060124: ART optical limits during the burst
  70. GRB060123: Optical and IR Imaging
  71. GRB 060123: P200 Observations
  72. GRB 060124: Keck optical spectrum
  73. GRB 060124: Keck Absorption Redshift
  74. GRB 060124: XRT refined analysis
  75. GRB 060124: R band Observations
  76. GRB060124: optical observations at Asiago
  77. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  78. GRB060123: SDSS pre-burst observations
  79. GRB 060123: Swift detection of a very long, faint burst
  80. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  81. GRB 060121: OHP optical limits
  82. GRB 060124: TAROT optical limits
  83. GRB 060124: Swift/UVOT Observation
  84. GRB 060124: Confirmation of the Afterglow
  85. GRB 060124: XRT position
  86. GRB 060124: Optical Afterglow Candidate from Tautenburg
  87. GRB060124, optical observation
  88. GRB 060124: Optical Observations at Tautenburg
  89. GRB 060117: Suzaku WAM observation of the prompt emission
  90. GRB 060111B: Suzaku WAM observation of the prompt emission
  91. GRB 060116: Radio Detection
  92. GRB 060116: MARGE optical observations
  93. GRB 060121: Swift/UVOT upper limits
  94. GRB 060121: Liverpool Telescopes optical limits
  95. GRB 060121: Swift XRT refined analysis
  96. Konus-Wind observation of GRB 060121
  97. GRB 060121: I-band Limits
  98. GRB 060121: Confirmation of Afterglow
  99. GRB 060121: candidate optical counterpart
  100. GRB 060121: Swift XRT refined position

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