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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"

26364 results found.

  1. GRB 060202: Swift/UVOT upper limits
  2. GRB 060121: Gemini Late-time Observations
  3. GRB 060130: PROMPT Observations
  4. GRB060130: Further R-band imaging
  5. GRB 060130: Swift/XRT observation
  6. GRB 060123: Gemini spectroscopy of the putative host galaxy
  7. GRB060130: Optical imaging
  8. GRB060130: REM infrared observations
  9. GRB 060130, SMARTS optical observations
  10. GRB 060130: FRAM optical observations
  11. GRB 060130: further INTEGRAL IBIS results
  12. GRB 060121: Confirmation of NIR Afterglow
  13. GRB 060123: Swift refined analysis of an unusual GRB
  14. GRB060124, BVRcIc field calibration
  15. GRB 060121: Probable Detection of NIR Afterglow
  16. GRB 060116 HST observations
  17. GRB 060124: HETE detection and spectrum of the main peak
  18. GRB060124: detailed XRT analysis
  19. GRB 060124: ART optical limits during the burst
  20. GRB060123: Optical and IR Imaging
  21. GRB 060123: P200 Observations
  22. GRB 060124: XRT refined analysis
  23. GRB 060124: R band Observations
  24. GRB 060124 : Optical observation at Xinglong and Kiso
  25. GRB060124: optical observations at Asiago
  26. GRB060123: SDSS pre-burst observations
  27. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  28. GRB 060121: OHP optical limits
  29. GRB 060124: TAROT optical limits
  30. GRB060124, optical observation
  31. GRB 060124: Optical Observations at Tautenburg
  32. GRB 060117: Suzaku WAM observation of the prompt emission
  33. GRB 060111B: Suzaku WAM observation of the prompt emission
  34. GRB 060124: Swift-BAT detection of a burst
  35. GRB 060121: Liverpool Telescopes optical limits
  36. GRB 060121: Swift XRT refined analysis
  37. Konus-Wind observation of GRB 060121
  38. GRB 060121: candidate optical counterpart
  39. GRB 060121: Infrared Observations
  40. GRB 060121: optical observations
  41. GRB 060121: Optical imaging
  42. GRB060121 - SDSS pre-burst observations
  43. HETE Alert 4006: MASTER promt optical limit
  44. GRB060117 - ATCA 3/6cm radio limits - correction
  45. GRB060117 - ATCA 3/6cm radio limits
  46. GRB 060116: photometric redshift - the farthest GRB?
  47. Konus-Wind observation of GRB 060117
  48. GRB 060116: UKIRT IR Observations
  49. GRB 060117: Refined analysis of the Swift-BAT burst
  50. GRB 060117: FRAM optical afterglow candidate
  51. GRB 060117: nearby galaxy
  52. GRB 060116: VLT optical observations
  53. GRB 060116: Refined analysis of the Swift-BAT burst
  54. GRB 060116: XRT refined analysis
  55. GRB 060116: IR Candidate Afterglow
  56. GRB 060116: Swift/UVOT upper limits
  57. GRB060115: REM observations
  58. GRB 060110: XRT position and analysis
  59. GRB 060116 : Lulin optical limit
  60. GRB060116: Faulkes North observation
  61. GRB 060116: Swift-BAT detection of a burst
  62. GRB 060115: Refined analysis of the Swift-BAT burst
  63. GRB 060115: Swift/UVOT upper limits
  64. GRB 060114: REM observations
  65. GRB 060115: Swift XRT refined analysis
  66. GRB 060114: Swift/UVOT Observations
  67. GRB060115, optical observation
  68. GRB 060115: MITSuME optical afterglow candidate
  69. GRB 060115: Swift detection of a burst
  70. GRB060114, optical observation
  71. GRB060114: Faulkes North observation
  72. GRB 060108: IR observations of afterglow
  73. GRB 060108: Evidence for an XRT Position Offset
  74. GRB 060110: KAIT observations
  75. GRB 060111B: Swift XRT refined analysis
  76. GRB 060111B: MITSuME detection of optical afterglow
  77. GRB 060111B: TAROT optical observation
  78. GRB060111A: RTT150 optical observations
  79. GRB060111B: RTT150, possible host galaxy
  80. GRB 060111B: Refined analysis of the Swift-BAT burst
  81. GRB 060111(a): P60 Observations
  82. GRB 060111B: Gualba observatory limit
  83. GRB 060111B: Swift detection of a burst
  84. GRB 060111: Swift-BAT Refined Analysis
  85. GRB060111.2:_MASTER optical limit
  86. GRB 060108: VLT K-band observations
  87. GRB 060111: TAROT optical observation
  88. GRB 060111: Swift detection of a burst
  89. GRB 060110: Mitsume optical observations
  90. GRB 060110: Swift-BAT refined analysis
  91. GRB 060109: Swift-BAT refined analysis
  92. GRB 060108: z-band imaging from Gemini-North
  93. GRB 060110a: RAPTOR detection of early optical emission.
  94. GRB 060110: UKIRT K-band observations
  95. GRB 060110: IR Candidate Afterglow
  96. GRB060110, optical observation
  97. GRB 060110: Correction
  98. Correction to GRB 060109 XRT analysis
  99. GRB 050110: IR Observations
  100. GRB 060109: Refined Swift-XRT analysis

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