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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"

32770 results found.

  1. GRB 060206: High redshift burst
  2. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  3. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  4. GRB060206: Optical afterglow
  5. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  6. GRB060203: WHT Z-band observations
  7. BAT GRB 060204C is probably not a GRB
  8. GRB060204C: optical observation
  9. GRB 060204B: BVRi-band detections of optical afterglow
  10. GRB 060204A: Swift XRT upper limit
  11. GRB 060204A: FRAM optical observations
  12. GRB060204B: Swift/UVOT refined analysis
  13. GRB 060204C: optical observations
  14. Swift XRT Observation of GRB 060204C
  15. GRB 060204B: Swift-BAT refined analysis
  16. GRB 060204B: ART early limit
  17. GRB060204B: Swift XRT Team Refined Analysis
  18. GRB 060204C: OSN limits
  19. GRB 060204b: Keck/LRIS Afterglow Confirmation
  20. GRB 060204C: BOOTES-IR optical limits
  21. GRB 060204C: Liverpool Telescopes optical limit
  22. GRB 060204C: ROTSE-III Optical Limits
  23. GRB 060124: Radio Observations
  24. GRB060204B: Faulkes OT candidate
  25. GRB 060204B: ART optical limit
  26. GRB 060204A: further INTEGRAL results
  27. GRB060204B, optical observation
  28. GRB 060203: Swift-BAT refined analysis
  29. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  30. GRB 060203: RTT150 optical observations
  31. GRB060203 - Swift UVOT observation
  32. Swift-BAT trigger is GRB 060203
  33. GRB 060203: IR Counterpart
  34. GRB060203: Observations with SARA
  35. GRB 060203: P60 Confirmation of Optical Afterglow
  36. Possible GRB 060203: candidate optical counterpart
  37. Swift BAT Trigger 180151: Swift XRT source detection
  38. Possible GRB 060203: optical observations at Asiago
  39. GRB 060202: PROMPT Observations
  40. GRB 060202: GETS observation
  41. GRB 060202: Gemini-N J, H, K_s observations
  42. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  43. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  44. GRB 060202: Refined analysis of the Swift-BAT burst
  45. GRB060202, optical observation
  46. GRB 060202: Swift/UVOT upper limits
  47. GRB 060202: Swift XRT Team Refined Analysis
  48. GRB 060202 : Lulin R and I band limit
  49. GRB060202: Faulkes North observation
  50. GRB 060121: Gemini Late-time Observations
  51. GRB 060130: PROMPT Observations
  52. GRB060130: Further R-band imaging
  53. GRB 060130: Swift/XRT observation
  54. GRB 051211A: MDM Observations
  55. GRB 060123: VLA Radio Observations
  56. GRB060130: Optical imaging
  57. GRB060130: REM infrared observations
  58. GRB 060130, SMARTS optical observations
  59. GRB 060130: FRAM optical observations
  60. Possible GRB 051221B: MDM Correction
  61. GRB050121: optical observation
  62. GRB050121b: optical observation
  63. GRB 060121: Confirmation of NIR Afterglow
  64. GRB060124: optical observation
  65. GRB060124: optical observations
  66. GRB 060123: Swift refined analysis of an unusual GRB
  67. GRB060124, BVRcIc field calibration
  68. GRB060124 optical observations
  69. GRB 060121: Probable Detection of NIR Afterglow
  70. GRB060124: optical observation
  71. GRB 060116 HST observations
  72. GRB 060124: HETE detection and spectrum of the main peak
  73. Refined XRT Position for GRB 060123
  74. Konus-Wind observation of GRB 060124
  75. GRB060124: detailed XRT analysis
  76. GRB 060124 Optical Observations
  77. GRB 060124: ART optical limits during the burst
  78. GRB060123: Optical and IR Imaging
  79. GRB 060123: P200 Observations
  80. GRB 060124: Keck optical spectrum
  81. GRB 060124: Keck Absorption Redshift
  82. GRB 060124: XRT refined analysis
  83. GRB 060124: R band Observations
  84. GRB060124: optical observations at Asiago
  85. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  86. GRB060123: SDSS pre-burst observations
  87. GRB 060123: Swift detection of a very long, faint burst
  88. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  89. GRB 060121: OHP optical limits
  90. GRB 060124: TAROT optical limits
  91. GRB 060124: Swift/UVOT Observation
  92. GRB 060124: Confirmation of the Afterglow
  93. GRB 060124: XRT position
  94. GRB 060124: Optical Afterglow Candidate from Tautenburg
  95. GRB060124, optical observation
  96. GRB 060124: Optical Observations at Tautenburg
  97. GRB 060117: Suzaku WAM observation of the prompt emission
  98. GRB 060111B: Suzaku WAM observation of the prompt emission
  99. GRB 060116: Radio Detection
  100. GRB 060116: MARGE optical observations

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