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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"

26329 results found.

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

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