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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"

26070 results found.

  1. GRB 060202: GETS observation
  2. GRB 060202: Gemini-N J, H, K_s observations
  3. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  4. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  5. GRB 060202: Refined analysis of the Swift-BAT burst
  6. GRB060202, optical observation
  7. GRB 060202: Swift/UVOT upper limits
  8. GRB 060121: Gemini Late-time Observations
  9. GRB 060130: PROMPT Observations
  10. GRB060130: Further R-band imaging
  11. GRB 060130: Swift/XRT observation
  12. GRB 060123: Gemini spectroscopy of the putative host galaxy
  13. GRB060130: Optical imaging
  14. GRB060130: REM infrared observations
  15. GRB 060130, SMARTS optical observations
  16. GRB 060130: FRAM optical observations
  17. GRB 060130: further INTEGRAL IBIS results
  18. GRB 060121: Confirmation of NIR Afterglow
  19. GRB 060123: Swift refined analysis of an unusual GRB
  20. GRB060124, BVRcIc field calibration
  21. GRB 060121: Probable Detection of NIR Afterglow
  22. GRB 060116 HST observations
  23. GRB 060124: HETE detection and spectrum of the main peak
  24. GRB060124: detailed XRT analysis
  25. GRB 060124: ART optical limits during the burst
  26. GRB060123: Optical and IR Imaging
  27. GRB 060123: P200 Observations
  28. GRB 060124: XRT refined analysis
  29. GRB 060124: R band Observations
  30. GRB 060124 : Optical observation at Xinglong and Kiso
  31. GRB060124: optical observations at Asiago
  32. GRB060123: SDSS pre-burst observations
  33. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  34. GRB 060121: OHP optical limits
  35. GRB 060124: TAROT optical limits
  36. GRB060124, optical observation
  37. GRB 060124: Optical Observations at Tautenburg
  38. GRB 060117: Suzaku WAM observation of the prompt emission
  39. GRB 060111B: Suzaku WAM observation of the prompt emission
  40. GRB 060124: Swift-BAT detection of a burst
  41. GRB 060121: Liverpool Telescopes optical limits
  42. GRB 060121: Swift XRT refined analysis
  43. Konus-Wind observation of GRB 060121
  44. GRB 060121: candidate optical counterpart
  45. GRB 060121: Infrared Observations
  46. GRB 060121: optical observations
  47. GRB 060121: Optical imaging
  48. GRB060121 - SDSS pre-burst observations
  49. HETE Alert 4006: MASTER promt optical limit
  50. GRB060117 - ATCA 3/6cm radio limits - correction
  51. GRB060117 - ATCA 3/6cm radio limits
  52. GRB 060116: photometric redshift - the farthest GRB?
  53. Konus-Wind observation of GRB 060117
  54. GRB 060116: UKIRT IR Observations
  55. GRB 060117: Refined analysis of the Swift-BAT burst
  56. GRB 060117: FRAM optical afterglow candidate
  57. GRB 060117: nearby galaxy
  58. GRB 060116: VLT optical observations
  59. GRB 060116: Refined analysis of the Swift-BAT burst
  60. GRB 060116: XRT refined analysis
  61. GRB 060116: IR Candidate Afterglow
  62. GRB 060116: Swift/UVOT upper limits
  63. GRB060115: REM observations
  64. GRB 060110: XRT position and analysis
  65. GRB 060116 : Lulin optical limit
  66. GRB060116: Faulkes North observation
  67. GRB 060116: Swift-BAT detection of a burst
  68. GRB 060115: Refined analysis of the Swift-BAT burst
  69. GRB 060115: Swift/UVOT upper limits
  70. GRB 060114: REM observations
  71. GRB 060115: Swift XRT refined analysis
  72. GRB 060114: Swift/UVOT Observations
  73. GRB060115, optical observation
  74. GRB 060115: MITSuME optical afterglow candidate
  75. GRB 060115: Swift detection of a burst
  76. GRB060114, optical observation
  77. GRB060114: Faulkes North observation
  78. GRB 060108: IR observations of afterglow
  79. GRB 060108: Evidence for an XRT Position Offset
  80. GRB 060110: KAIT observations
  81. GRB 060111B: Swift XRT refined analysis
  82. GRB 060111B: MITSuME detection of optical afterglow
  83. GRB 060111B: TAROT optical observation
  84. GRB060111A: RTT150 optical observations
  85. GRB060111B: RTT150, possible host galaxy
  86. GRB 060111B: Refined analysis of the Swift-BAT burst
  87. GRB 060111(a): P60 Observations
  88. GRB 060111B: Gualba observatory limit
  89. GRB 060111B: Swift detection of a burst
  90. GRB 060111: Swift-BAT Refined Analysis
  91. GRB060111.2:_MASTER optical limit
  92. GRB 060108: VLT K-band observations
  93. GRB 060111: TAROT optical observation
  94. GRB 060111: Swift detection of a burst
  95. GRB 060110: Mitsume optical observations
  96. GRB 060110: Swift-BAT refined analysis
  97. GRB 060109: Swift-BAT refined analysis
  98. GRB 060108: z-band imaging from Gemini-North
  99. GRB 060110a: RAPTOR detection of early optical emission.
  100. GRB 060110: UKIRT K-band observations

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