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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"

28091 results found.

  1. GRB 060110: KAIT observations
  2. GRB 060111B: Swift XRT refined analysis
  3. GRB 060111B: MITSuME detection of optical afterglow
  4. GRB 060111B: TAROT optical observation
  5. GRB060111A: RTT150 optical observations
  6. GRB060111B: RTT150, possible host galaxy
  7. GRB 060111B: Refined analysis of the Swift-BAT burst
  8. GRB 060111(a): P60 Observations
  9. GRB 060111B: Gualba observatory limit
  10. GRB 060111B: Swift detection of a burst
  11. GRB 060111: Swift-BAT Refined Analysis
  12. GRB060111.2:_MASTER optical limit
  13. GRB 060108: VLT K-band observations
  14. GRB 060111: TAROT optical observation
  15. GRB 060111: Swift detection of a burst
  16. GRB 060110: Mitsume optical observations
  17. GRB 060110: Swift-BAT refined analysis
  18. GRB 060109: Swift-BAT refined analysis
  19. GRB 060108: z-band imaging from Gemini-North
  20. GRB 060110a: RAPTOR detection of early optical emission.
  21. GRB 060110: UKIRT K-band observations
  22. GRB 060110: IR Candidate Afterglow
  23. GRB060110, optical observation
  24. GRB 060110: Correction
  25. Correction to GRB 060109 XRT analysis
  26. GRB 050110: IR Observations
  27. GRB 060109: Refined Swift-XRT analysis
  28. GRB 060109: Swift/UVOT upper limits
  29. GRB060109, optical observation
  30. GRB 060108: ISAS early observations and near IR upper limit
  31. GRB060108: P200 Ks Observations
  32. GRB 060108: early UKIRT K-band observations
  33. GRB 060108: a dark burst?
  34. GRB 060108: Refined XRT analysis
  35. GRB 060108: VLT J-band observations
  36. GRB 060108: Mitsume optical observations
  37. GRB 060108: Swift/UVOT upper limits
  38. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  39. GRB060108: SDSS pre-burst observations
  40. GRB060108: Faulkes Telescope observation
  41. GRB060108, optical observation
  42. GRB 060108: Refined analysis of the Swift-BAT burst
  43. GRB060108: Swift detection of its 100th GRB
  44. GRB 060105: ISAS observations and near IR upper limit
  45. GRB 060105: Swift/UVOT upper limits
  46. GRB 060105: Mitsume optical observations
  47. GRB 060105: BAT refined analysis
  48. GRB 060105: XRT refined analysis
  49. GRB060105: Suzaku-XIS and -HXD observation plan
  50. GRB060105, optical observation
  51. GRB060105: Swift detection of a bright long burst
  52. Swift-BAT trigger 175653 is probably not a GRB
  53. GRB 060102: Swift-BAT refined analysis
  54. GRB 060102: Swift-BAT detection of a burst
  55. GRB 051221B: Optical Observations with Kuiper 1.54m
  56. GRB 051227: Likely host galaxy underlying afterglow position
  57. GRB 051227: optical observation
  58. GRB 051227: optical afterglow
  59. GRB 051227: Magellan r'-band Imaging/Astrometry
  60. GRB 051227: refined analysis of VLT images
  61. GRB 051227: P60 Observations
  62. GRB 051227: MDM Observation
  63. GRB 051227: R-band object in the XRT error circle
  64. GRB 051227: XRT refined analysis
  65. GRB 051227: Further analysis of the Swift-BAT burst
  66. GRB 051227: Refined analysis of the Swift-BAT burst
  67. GRB051227: SDSS pre-burst observations
  68. GRB 051227, optical observation
  69. GRB051117B: optical observation
  70. Konus-Wind observation of GRB 051221A
  71. GRB051221A: Suzaku WAM observation of the prompt emission
  72. GRB 051221A: MDM Optical Observations
  73. GRB051016: analysis of the XMM-Newton observation
  74. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  75. GRB 051221B: TAROT optical limits
  76. GRB 051221B: Refined analysis of the Swift-BAT burst
  77. GRB 051221B: BOOTES optical observations.
  78. Swift-BAT detection of a possible burst
  79. GRB 051221: Swift XRT refined analysis
  80. GRB 051221: Swift/UVOT upper limits
  81. GRB 051221: No variability in Gemini data
  82. GRB 051221: Improved astrometry of the IR counterpart
  83. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  84. GRB 051221: Swift detection of a bright short burst
  85. Swift detection of an RS CVn flare star
  86. GRB051211A: possible optical candidate
  87. GRB 051215: near-infrared observations
  88. GRB051215 - SDSS pre-burst observations
  89. GRB 051215: Swift detection of a possible burst
  90. GRB051105: optical observations
  91. GRB 051213: Swift-BAT refined analysis
  92. GRB051211B: XRT refined analysis
  93. GRB 051211B, optical observation
  94. GRB 051211A: Swift/UVOT upper limits
  95. GRB 051211B: Swift/UVOT upper limits
  96. GRB 051211A,optical observation
  97. GRB051211B: Liverpool Telescope observation
  98. GRB051211b: P60 Observations
  99. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  100. GRB 051210: Swift/UVOT upper limits

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