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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"

26366 results found.

  1. GRB 060202: Refined analysis of the Swift-BAT burst
  2. GRB060202, optical observation
  3. GRB 060202: Swift/UVOT upper limits
  4. GRB 060121: Gemini Late-time Observations
  5. GRB 060130: PROMPT Observations
  6. GRB060130: Further R-band imaging
  7. GRB 060130: Swift/XRT observation
  8. GRB 060123: Gemini spectroscopy of the putative host galaxy
  9. GRB060130: Optical imaging
  10. GRB060130: REM infrared observations
  11. GRB 060130, SMARTS optical observations
  12. GRB 060130: FRAM optical observations
  13. GRB 060130: further INTEGRAL IBIS results
  14. GRB 060121: Confirmation of NIR Afterglow
  15. GRB 060123: Swift refined analysis of an unusual GRB
  16. GRB060124, BVRcIc field calibration
  17. GRB 060121: Probable Detection of NIR Afterglow
  18. GRB 060116 HST observations
  19. GRB 060124: HETE detection and spectrum of the main peak
  20. GRB060124: detailed XRT analysis
  21. GRB 060124: ART optical limits during the burst
  22. GRB060123: Optical and IR Imaging
  23. GRB 060123: P200 Observations
  24. GRB 060124: XRT refined analysis
  25. GRB 060124: R band Observations
  26. GRB 060124 : Optical observation at Xinglong and Kiso
  27. GRB060124: optical observations at Asiago
  28. GRB060123: SDSS pre-burst observations
  29. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  30. GRB 060121: OHP optical limits
  31. GRB 060124: TAROT optical limits
  32. GRB060124, optical observation
  33. GRB 060124: Optical Observations at Tautenburg
  34. GRB 060117: Suzaku WAM observation of the prompt emission
  35. GRB 060111B: Suzaku WAM observation of the prompt emission
  36. GRB 060124: Swift-BAT detection of a burst
  37. GRB 060121: Liverpool Telescopes optical limits
  38. GRB 060121: Swift XRT refined analysis
  39. Konus-Wind observation of GRB 060121
  40. GRB 060121: candidate optical counterpart
  41. GRB 060121: Infrared Observations
  42. GRB 060121: optical observations
  43. GRB 060121: Optical imaging
  44. GRB060121 - SDSS pre-burst observations
  45. HETE Alert 4006: MASTER promt optical limit
  46. GRB060117 - ATCA 3/6cm radio limits - correction
  47. GRB060117 - ATCA 3/6cm radio limits
  48. GRB 060116: photometric redshift - the farthest GRB?
  49. Konus-Wind observation of GRB 060117
  50. GRB 060116: UKIRT IR Observations
  51. GRB 060117: Refined analysis of the Swift-BAT burst
  52. GRB 060117: FRAM optical afterglow candidate
  53. GRB 060117: nearby galaxy
  54. GRB 060116: VLT optical observations
  55. GRB 060116: Refined analysis of the Swift-BAT burst
  56. GRB 060116: XRT refined analysis
  57. GRB 060116: IR Candidate Afterglow
  58. GRB 060116: Swift/UVOT upper limits
  59. GRB060115: REM observations
  60. GRB 060110: XRT position and analysis
  61. GRB 060116 : Lulin optical limit
  62. GRB060116: Faulkes North observation
  63. GRB 060116: Swift-BAT detection of a burst
  64. GRB 060115: Refined analysis of the Swift-BAT burst
  65. GRB 060115: Swift/UVOT upper limits
  66. GRB 060114: REM observations
  67. GRB 060115: Swift XRT refined analysis
  68. GRB 060114: Swift/UVOT Observations
  69. GRB060115, optical observation
  70. GRB 060115: MITSuME optical afterglow candidate
  71. GRB 060115: Swift detection of a burst
  72. GRB060114, optical observation
  73. GRB060114: Faulkes North observation
  74. GRB 060108: IR observations of afterglow
  75. GRB 060108: Evidence for an XRT Position Offset
  76. GRB 060110: KAIT observations
  77. GRB 060111B: Swift XRT refined analysis
  78. GRB 060111B: MITSuME detection of optical afterglow
  79. GRB 060111B: TAROT optical observation
  80. GRB060111A: RTT150 optical observations
  81. GRB060111B: RTT150, possible host galaxy
  82. GRB 060111B: Refined analysis of the Swift-BAT burst
  83. GRB 060111(a): P60 Observations
  84. GRB 060111B: Gualba observatory limit
  85. GRB 060111B: Swift detection of a burst
  86. GRB 060111: Swift-BAT Refined Analysis
  87. GRB060111.2:_MASTER optical limit
  88. GRB 060108: VLT K-band observations
  89. GRB 060111: TAROT optical observation
  90. GRB 060111: Swift detection of a burst
  91. GRB 060110: Mitsume optical observations
  92. GRB 060110: Swift-BAT refined analysis
  93. GRB 060109: Swift-BAT refined analysis
  94. GRB 060108: z-band imaging from Gemini-North
  95. GRB 060110a: RAPTOR detection of early optical emission.
  96. GRB 060110: UKIRT K-band observations
  97. GRB 060110: IR Candidate Afterglow
  98. GRB060110, optical observation
  99. GRB 060110: Correction
  100. Correction to GRB 060109 XRT analysis

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