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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"

26359 results found.

  1. GRB 060123: Gemini spectroscopy of the putative host galaxy
  2. GRB060130: Optical imaging
  3. GRB060130: REM infrared observations
  4. GRB 060130, SMARTS optical observations
  5. GRB 060130: FRAM optical observations
  6. GRB 060130: further INTEGRAL IBIS results
  7. GRB 060121: Confirmation of NIR Afterglow
  8. GRB 060123: Swift refined analysis of an unusual GRB
  9. GRB060124, BVRcIc field calibration
  10. GRB 060121: Probable Detection of NIR Afterglow
  11. GRB 060116 HST observations
  12. GRB 060124: HETE detection and spectrum of the main peak
  13. GRB060124: detailed XRT analysis
  14. GRB 060124: ART optical limits during the burst
  15. GRB060123: Optical and IR Imaging
  16. GRB 060123: P200 Observations
  17. GRB 060124: XRT refined analysis
  18. GRB 060124: R band Observations
  19. GRB 060124 : Optical observation at Xinglong and Kiso
  20. GRB060124: optical observations at Asiago
  21. GRB060123: SDSS pre-burst observations
  22. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  23. GRB 060121: OHP optical limits
  24. GRB 060124: TAROT optical limits
  25. GRB060124, optical observation
  26. GRB 060124: Optical Observations at Tautenburg
  27. GRB 060117: Suzaku WAM observation of the prompt emission
  28. GRB 060111B: Suzaku WAM observation of the prompt emission
  29. GRB 060124: Swift-BAT detection of a burst
  30. GRB 060121: Liverpool Telescopes optical limits
  31. GRB 060121: Swift XRT refined analysis
  32. Konus-Wind observation of GRB 060121
  33. GRB 060121: candidate optical counterpart
  34. GRB 060121: Infrared Observations
  35. GRB 060121: optical observations
  36. GRB 060121: Optical imaging
  37. GRB060121 - SDSS pre-burst observations
  38. HETE Alert 4006: MASTER promt optical limit
  39. GRB060117 - ATCA 3/6cm radio limits - correction
  40. GRB060117 - ATCA 3/6cm radio limits
  41. GRB 060116: photometric redshift - the farthest GRB?
  42. Konus-Wind observation of GRB 060117
  43. GRB 060116: UKIRT IR Observations
  44. GRB 060117: Refined analysis of the Swift-BAT burst
  45. GRB 060117: FRAM optical afterglow candidate
  46. GRB 060117: nearby galaxy
  47. GRB 060116: VLT optical observations
  48. GRB 060116: Refined analysis of the Swift-BAT burst
  49. GRB 060116: XRT refined analysis
  50. GRB 060116: IR Candidate Afterglow
  51. GRB 060116: Swift/UVOT upper limits
  52. GRB060115: REM observations
  53. GRB 060110: XRT position and analysis
  54. GRB 060116 : Lulin optical limit
  55. GRB060116: Faulkes North observation
  56. GRB 060116: Swift-BAT detection of a burst
  57. GRB 060115: Refined analysis of the Swift-BAT burst
  58. GRB 060115: Swift/UVOT upper limits
  59. GRB 060114: REM observations
  60. GRB 060115: Swift XRT refined analysis
  61. GRB 060114: Swift/UVOT Observations
  62. GRB060115, optical observation
  63. GRB 060115: MITSuME optical afterglow candidate
  64. GRB 060115: Swift detection of a burst
  65. GRB060114, optical observation
  66. GRB060114: Faulkes North observation
  67. GRB 060108: IR observations of afterglow
  68. GRB 060108: Evidence for an XRT Position Offset
  69. GRB 060110: KAIT observations
  70. GRB 060111B: Swift XRT refined analysis
  71. GRB 060111B: MITSuME detection of optical afterglow
  72. GRB 060111B: TAROT optical observation
  73. GRB060111A: RTT150 optical observations
  74. GRB060111B: RTT150, possible host galaxy
  75. GRB 060111B: Refined analysis of the Swift-BAT burst
  76. GRB 060111(a): P60 Observations
  77. GRB 060111B: Gualba observatory limit
  78. GRB 060111B: Swift detection of a burst
  79. GRB 060111: Swift-BAT Refined Analysis
  80. GRB060111.2:_MASTER optical limit
  81. GRB 060108: VLT K-band observations
  82. GRB 060111: TAROT optical observation
  83. GRB 060111: Swift detection of a burst
  84. GRB 060110: Mitsume optical observations
  85. GRB 060110: Swift-BAT refined analysis
  86. GRB 060109: Swift-BAT refined analysis
  87. GRB 060108: z-band imaging from Gemini-North
  88. GRB 060110a: RAPTOR detection of early optical emission.
  89. GRB 060110: UKIRT K-band observations
  90. GRB 060110: IR Candidate Afterglow
  91. GRB060110, optical observation
  92. GRB 060110: Correction
  93. Correction to GRB 060109 XRT analysis
  94. GRB 050110: IR Observations
  95. GRB 060109: Refined Swift-XRT analysis
  96. GRB 060109: Swift/UVOT upper limits
  97. GRB060109, optical observation
  98. GRB 060108: ISAS early observations and near IR upper limit
  99. GRB060108: P200 Ks Observations
  100. GRB 060108: early UKIRT K-band observations

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