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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"

26327 results found.

  1. GRB 060121: candidate optical counterpart
  2. GRB 060121: Infrared Observations
  3. GRB 060121: optical observations
  4. GRB 060121: Optical imaging
  5. GRB060121 - SDSS pre-burst observations
  6. HETE Alert 4006: MASTER promt optical limit
  7. GRB060117 - ATCA 3/6cm radio limits - correction
  8. GRB060117 - ATCA 3/6cm radio limits
  9. GRB 060116: photometric redshift - the farthest GRB?
  10. Konus-Wind observation of GRB 060117
  11. GRB 060116: UKIRT IR Observations
  12. GRB 060117: Refined analysis of the Swift-BAT burst
  13. GRB 060117: FRAM optical afterglow candidate
  14. GRB 060117: nearby galaxy
  15. GRB 060116: VLT optical observations
  16. GRB 060116: Refined analysis of the Swift-BAT burst
  17. GRB 060116: XRT refined analysis
  18. GRB 060116: IR Candidate Afterglow
  19. GRB 060116: Swift/UVOT upper limits
  20. GRB060115: REM observations
  21. GRB 060110: XRT position and analysis
  22. GRB 060116 : Lulin optical limit
  23. GRB060116: Faulkes North observation
  24. GRB 060116: Swift-BAT detection of a burst
  25. GRB 060115: Refined analysis of the Swift-BAT burst
  26. GRB 060115: Swift/UVOT upper limits
  27. GRB 060114: REM observations
  28. GRB 060115: Swift XRT refined analysis
  29. GRB 060114: Swift/UVOT Observations
  30. GRB060115, optical observation
  31. GRB 060115: MITSuME optical afterglow candidate
  32. GRB 060115: Swift detection of a burst
  33. GRB060114, optical observation
  34. GRB060114: Faulkes North observation
  35. GRB 060108: IR observations of afterglow
  36. GRB 060108: Evidence for an XRT Position Offset
  37. GRB 060110: KAIT observations
  38. GRB 060111B: Swift XRT refined analysis
  39. GRB 060111B: MITSuME detection of optical afterglow
  40. GRB 060111B: TAROT optical observation
  41. GRB060111A: RTT150 optical observations
  42. GRB060111B: RTT150, possible host galaxy
  43. GRB 060111B: Refined analysis of the Swift-BAT burst
  44. GRB 060111(a): P60 Observations
  45. GRB 060111B: Gualba observatory limit
  46. GRB 060111B: Swift detection of a burst
  47. GRB 060111: Swift-BAT Refined Analysis
  48. GRB060111.2:_MASTER optical limit
  49. GRB 060108: VLT K-band observations
  50. GRB 060111: TAROT optical observation
  51. GRB 060111: Swift detection of a burst
  52. GRB 060110: Mitsume optical observations
  53. GRB 060110: Swift-BAT refined analysis
  54. GRB 060109: Swift-BAT refined analysis
  55. GRB 060108: z-band imaging from Gemini-North
  56. GRB 060110a: RAPTOR detection of early optical emission.
  57. GRB 060110: UKIRT K-band observations
  58. GRB 060110: IR Candidate Afterglow
  59. GRB060110, optical observation
  60. GRB 060110: Correction
  61. Correction to GRB 060109 XRT analysis
  62. GRB 050110: IR Observations
  63. GRB 060109: Refined Swift-XRT analysis
  64. GRB 060109: Swift/UVOT upper limits
  65. GRB060109, optical observation
  66. GRB 060108: ISAS early observations and near IR upper limit
  67. GRB060108: P200 Ks Observations
  68. GRB 060108: early UKIRT K-band observations
  69. GRB 060108: a dark burst?
  70. GRB 060108: Refined XRT analysis
  71. GRB 060108: VLT J-band observations
  72. GRB 060108: Mitsume optical observations
  73. GRB 060108: Swift/UVOT upper limits
  74. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  75. GRB060108: SDSS pre-burst observations
  76. GRB060108: Faulkes Telescope observation
  77. GRB060108, optical observation
  78. GRB 060108: Refined analysis of the Swift-BAT burst
  79. GRB060108: Swift detection of its 100th GRB
  80. GRB 060105: ISAS observations and near IR upper limit
  81. GRB 060105: Swift/UVOT upper limits
  82. GRB 060105: Mitsume optical observations
  83. GRB 060105: BAT refined analysis
  84. GRB 060105: XRT refined analysis
  85. GRB060105: Suzaku-XIS and -HXD observation plan
  86. GRB060105, optical observation
  87. GRB060105: Swift detection of a bright long burst
  88. Swift-BAT trigger 175653 is probably not a GRB
  89. GRB 060102: Swift-BAT refined analysis
  90. GRB 060102: Swift-BAT detection of a burst
  91. GRB 051221B: Optical Observations with Kuiper 1.54m
  92. GRB 051227: Likely host galaxy underlying afterglow position
  93. GRB 051227: optical observation
  94. GRB 051227: optical afterglow
  95. GRB 051227: Magellan r'-band Imaging/Astrometry
  96. GRB 051227: refined analysis of VLT images
  97. GRB 051227: P60 Observations
  98. GRB 051227: MDM Observation
  99. GRB 051227: R-band object in the XRT error circle
  100. GRB 051227: XRT refined analysis

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