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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

28091 results found.

  1. GRB060204C: optical observation
  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. GRB 060204b: Keck/LRIS Afterglow Confirmation
  10. GRB 060204C: Liverpool Telescopes optical limit
  11. GRB 060204C: Swift-BAT detection of a burst
  12. GRB 060204A: further INTEGRAL results
  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. GRB 060203: IR Counterpart
  20. Possible GRB 060203: optical observations at Asiago
  21. GRB 060202: PROMPT Observations
  22. GRB 060202: GETS observation
  23. GRB 060202: Gemini-N J, H, K_s observations
  24. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  25. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  26. GRB 060202: Refined analysis of the Swift-BAT burst
  27. GRB060202, optical observation
  28. GRB 060202: Swift/UVOT upper limits
  29. GRB 060121: Gemini Late-time Observations
  30. GRB 060130: PROMPT Observations
  31. GRB060130: Further R-band imaging
  32. GRB 060130: Swift/XRT observation
  33. GRB 060123: Gemini spectroscopy of the putative host galaxy
  34. GRB060130: Optical imaging
  35. GRB060130: REM infrared observations
  36. GRB 060130, SMARTS optical observations
  37. GRB 060130: FRAM optical observations
  38. GRB 060130: further INTEGRAL IBIS results
  39. GRB 060121: Confirmation of NIR Afterglow
  40. GRB 060123: Swift refined analysis of an unusual GRB
  41. GRB060124, BVRcIc field calibration
  42. GRB 060121: Probable Detection of NIR Afterglow
  43. GRB 060116 HST observations
  44. GRB 060124: HETE detection and spectrum of the main peak
  45. GRB060124: detailed XRT analysis
  46. GRB 060124: ART optical limits during the burst
  47. GRB060123: Optical and IR Imaging
  48. GRB 060123: P200 Observations
  49. GRB 060124: XRT refined analysis
  50. GRB 060124: R band Observations
  51. GRB 060124 : Optical observation at Xinglong and Kiso
  52. GRB060124: optical observations at Asiago
  53. GRB060123: SDSS pre-burst observations
  54. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  55. GRB 060121: OHP optical limits
  56. GRB 060124: TAROT optical limits
  57. GRB060124, optical observation
  58. GRB 060124: Optical Observations at Tautenburg
  59. GRB 060117: Suzaku WAM observation of the prompt emission
  60. GRB 060111B: Suzaku WAM observation of the prompt emission
  61. GRB 060124: Swift-BAT detection of a burst
  62. GRB 060121: Liverpool Telescopes optical limits
  63. GRB 060121: Swift XRT refined analysis
  64. Konus-Wind observation of GRB 060121
  65. GRB 060121: candidate optical counterpart
  66. GRB 060121: Infrared Observations
  67. GRB 060121: optical observations
  68. GRB 060121: Optical imaging
  69. GRB060121 - SDSS pre-burst observations
  70. HETE Alert 4006: MASTER promt optical limit
  71. GRB060117 - ATCA 3/6cm radio limits - correction
  72. GRB060117 - ATCA 3/6cm radio limits
  73. GRB 060116: photometric redshift - the farthest GRB?
  74. Konus-Wind observation of GRB 060117
  75. GRB 060116: UKIRT IR Observations
  76. GRB 060117: Refined analysis of the Swift-BAT burst
  77. GRB 060117: FRAM optical afterglow candidate
  78. GRB 060117: nearby galaxy
  79. GRB 060116: VLT optical observations
  80. GRB 060116: Refined analysis of the Swift-BAT burst
  81. GRB 060116: XRT refined analysis
  82. GRB 060116: IR Candidate Afterglow
  83. GRB 060116: Swift/UVOT upper limits
  84. GRB060115: REM observations
  85. GRB 060110: XRT position and analysis
  86. GRB 060116 : Lulin optical limit
  87. GRB060116: Faulkes North observation
  88. GRB 060116: Swift-BAT detection of a burst
  89. GRB 060115: Refined analysis of the Swift-BAT burst
  90. GRB 060115: Swift/UVOT upper limits
  91. GRB 060114: REM observations
  92. GRB 060115: Swift XRT refined analysis
  93. GRB 060114: Swift/UVOT Observations
  94. GRB060115, optical observation
  95. GRB 060115: MITSuME optical afterglow candidate
  96. GRB 060115: Swift detection of a burst
  97. GRB060114, optical observation
  98. GRB060114: Faulkes North observation
  99. GRB 060108: IR observations of afterglow
  100. GRB 060108: Evidence for an XRT Position Offset

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