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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"

26052 results found.

  1. GRB 060121: Confirmation of NIR Afterglow
  2. GRB060124: optical observation
  3. GRB060124: optical observations
  4. GRB 060123: Swift refined analysis of an unusual GRB
  5. GRB060124, BVRcIc field calibration
  6. GRB060105: refined analysis of the Suzaku observation
  7. GRB 060121: Probable Detection of NIR Afterglow
  8. GRB060124: optical observation
  9. GRB 060116 HST observations
  10. GRB 060124: HETE detection and spectrum of the main peak
  11. Refined XRT Position for GRB 060123
  12. Konus-Wind observation of GRB 060124
  13. GRB060124: detailed XRT analysis
  14. GRB 060124 Optical Observations
  15. GRB 060124: ART optical limits during the burst
  16. GRB060123: Optical and IR Imaging
  17. GRB 060123: P200 Observations
  18. GRB 060124: Keck optical spectrum
  19. GRB 060124: MDM Optical Spectrum
  20. GRB 060124: XRT refined analysis
  21. GRB 060124: R band Observations
  22. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  23. GRB 060123: Swift detection of a very long, faint burst
  24. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  25. GRB 060124: TAROT optical limits
  26. GRB 060124: Swift/UVOT Observation
  27. GRB 060124: Confirmation of the Afterglow
  28. GRB 060124: XRT position
  29. GRB 060124: Optical Afterglow Candidate from Tautenburg
  30. GRB 060124: Optical Observations at Tautenburg
  31. GRB 060117: Suzaku WAM observation of the prompt emission
  32. GRB060124:MASTER optical observation
  33. GRB 060111B: Suzaku WAM observation of the prompt emission
  34. GRB 060124: Swift-BAT detection of a burst
  35. GRB 060116: Radio Detection
  36. GRB 060116: MARGE optical observations
  37. GRB 060121: Swift/UVOT upper limits
  38. GRB 060121: Liverpool Telescopes optical limits
  39. GRB 060121: Swift XRT refined analysis
  40. GRB 060121: I-band Limits
  41. GRB 060121: Confirmation of Afterglow
  42. GRB 060121: candidate optical counterpart
  43. GRB 060121: Swift XRT refined position
  44. GRB 060117: PROMPT Observations
  45. GRB060117 - ATCA 3/6cm radio limits
  46. GRB 060116: photometric redshift - the farthest GRB?
  47. GRB 060117: pseudo-z from spectral parameters of the prompt emission
  48. Konus-Wind observation of GRB 060117
  49. GRB 060116: possible I-J dropout
  50. GRB060108: photometric redshift determination
  51. GRB 060117: Refined analysis of the Swift-BAT burst
  52. GRB 060116: PROMPT Observations
  53. GRB 060117: FRAM refined analysis
  54. GRB 060117: FRAM optical afterglow candidate
  55. GRB 060117: Swift-BAT detection of a bright burst
  56. GRB 060116: VLT optical observations
  57. GRB 060116: Refined analysis of the Swift-BAT burst
  58. GRB 060115: PROMPT Observations
  59. GRB 060116: XRT refined analysis
  60. GRB 060116: IR Candidate Afterglow
  61. GRB 060116: Swift/UVOT upper limits
  62. GRB060115: REM observations
  63. GRB 060110: XRT position and analysis
  64. GRB 060116 : Lulin optical limit
  65. GRB 060116: ROTSE-III Optical Limits
  66. GRB060116: XRT position
  67. GRB060116: Faulkes North observation
  68. GRB 060116: Swift-BAT detection of a burst
  69. GRB 060115: Refined analysis of the Swift-BAT burst
  70. GRB 060115: OT photometry with MITSuME
  71. GRB 060115: Swift/UVOT upper limits
  72. GRB 060115: Swift XRT refined analysis
  73. GRB 060115: OT finding chart
  74. GRB 060114: Swift/UVOT Observations
  75. GRB 060115: MITSuME optical afterglow candidate
  76. GRB 060115: Swift detection of a burst
  77. GRB 060114: Swift XRT upper limit
  78. GRB060114: Faulkes North observation
  79. GRB 060108: IR observations of afterglow
  80. GRB060108: Faulkes North afterglow evidence
  81. GRB 060108: further analysis of VLT images
  82. GRB 060108: Evidence for an XRT Position Offset
  83. GRB 060110: KAIT observations
  84. GRB 060111B: Swift XRT refined analysis
  85. GRB 060111A: refined UVOT anaysis
  86. GRB 060111B: MITSuME detection of optical afterglow
  87. GRB 060111B: TAROT optical observation
  88. GRB060111A: RTT150 optical observations
  89. GRB060111B: RTT150, possible host galaxy
  90. GRB 060111B: Refined analysis of the Swift-BAT burst
  91. GRB 060110: MARGE observations
  92. GRB 060111(a): P60 Observations
  93. GRB 060111B: Gualba observatory limit
  94. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  95. GRB 060111B: Swift detection of a burst
  96. GRB 060111: Swift-BAT Refined Analysis
  97. GRB 060108: VLT K-band observations
  98. GRB 060111: TAROT optical observation
  99. GRB 060111: possible UVOT counterpart
  100. GRB060111 : XRT refined analysis

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