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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"

26499 results found.

  1. GRB 060114: Swift/UVOT Observations
  2. GRB060115, optical observation
  3. GRB 060115: MITSuME optical afterglow candidate
  4. GRB 060115: Swift detection of a burst
  5. GRB060114, optical observation
  6. GRB060114: Faulkes North observation
  7. GRB 060108: IR observations of afterglow
  8. GRB 060108: Evidence for an XRT Position Offset
  9. GRB 060110: KAIT observations
  10. GRB 060111B: Swift XRT refined analysis
  11. GRB 060111B: MITSuME detection of optical afterglow
  12. GRB 060111B: TAROT optical observation
  13. GRB060111A: RTT150 optical observations
  14. GRB060111B: RTT150, possible host galaxy
  15. GRB 060111B: Refined analysis of the Swift-BAT burst
  16. GRB 060111(a): P60 Observations
  17. GRB 060111B: Gualba observatory limit
  18. GRB 060111B: Swift detection of a burst
  19. GRB 060111: Swift-BAT Refined Analysis
  20. GRB060111.2:_MASTER optical limit
  21. GRB 060108: VLT K-band observations
  22. GRB 060111: TAROT optical observation
  23. GRB 060111: Swift detection of a burst
  24. GRB 060110: Mitsume optical observations
  25. GRB 060110: Swift-BAT refined analysis
  26. GRB 060109: Swift-BAT refined analysis
  27. GRB 060108: z-band imaging from Gemini-North
  28. GRB 060110a: RAPTOR detection of early optical emission.
  29. GRB 060110: UKIRT K-band observations
  30. GRB 060110: IR Candidate Afterglow
  31. GRB060110, optical observation
  32. GRB 060110: Correction
  33. Correction to GRB 060109 XRT analysis
  34. GRB 050110: IR Observations
  35. GRB 060109: Refined Swift-XRT analysis
  36. GRB 060109: Swift/UVOT upper limits
  37. GRB060109, optical observation
  38. GRB 060108: ISAS early observations and near IR upper limit
  39. GRB060108: P200 Ks Observations
  40. GRB 060108: early UKIRT K-band observations
  41. GRB 060108: a dark burst?
  42. GRB 060108: Refined XRT analysis
  43. GRB 060108: VLT J-band observations
  44. GRB 060108: Mitsume optical observations
  45. GRB 060108: Swift/UVOT upper limits
  46. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  47. GRB060108: SDSS pre-burst observations
  48. GRB060108: Faulkes Telescope observation
  49. GRB060108, optical observation
  50. GRB 060108: Refined analysis of the Swift-BAT burst
  51. GRB060108: Swift detection of its 100th GRB
  52. GRB 060105: ISAS observations and near IR upper limit
  53. GRB 060105: Swift/UVOT upper limits
  54. GRB 060105: Mitsume optical observations
  55. GRB 060105: BAT refined analysis
  56. GRB 060105: XRT refined analysis
  57. GRB060105: Suzaku-XIS and -HXD observation plan
  58. GRB060105, optical observation
  59. GRB060105: Swift detection of a bright long burst
  60. Swift-BAT trigger 175653 is probably not a GRB
  61. GRB 060102: Swift-BAT refined analysis
  62. GRB 060102: Swift-BAT detection of a burst
  63. GRB 051221B: Optical Observations with Kuiper 1.54m
  64. GRB 051227: Likely host galaxy underlying afterglow position
  65. GRB 051227: optical observation
  66. GRB 051227: optical afterglow
  67. GRB 051227: Magellan r'-band Imaging/Astrometry
  68. GRB 051227: refined analysis of VLT images
  69. GRB 051227: P60 Observations
  70. GRB 051227: MDM Observation
  71. GRB 051227: R-band object in the XRT error circle
  72. GRB 051227: XRT refined analysis
  73. GRB 051227: Further analysis of the Swift-BAT burst
  74. GRB 051227: Refined analysis of the Swift-BAT burst
  75. GRB051227: SDSS pre-burst observations
  76. GRB 051227, optical observation
  77. GRB051117B: optical observation
  78. Konus-Wind observation of GRB 051221A
  79. GRB051221A: Suzaku WAM observation of the prompt emission
  80. GRB 051221A: MDM Optical Observations
  81. GRB051016: analysis of the XMM-Newton observation
  82. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  83. GRB 051221B: TAROT optical limits
  84. GRB 051221B: Refined analysis of the Swift-BAT burst
  85. GRB 051221B: BOOTES optical observations.
  86. Swift-BAT detection of a possible burst
  87. GRB 051221: Swift XRT refined analysis
  88. GRB 051221: Swift/UVOT upper limits
  89. GRB 051221: No variability in Gemini data
  90. GRB 051221: Improved astrometry of the IR counterpart
  91. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  92. GRB 051221: Swift detection of a bright short burst
  93. Swift detection of an RS CVn flare star
  94. GRB051211A: possible optical candidate
  95. GRB 051215: near-infrared observations
  96. GRB051215 - SDSS pre-burst observations
  97. GRB 051215: Swift detection of a possible burst
  98. GRB051105: optical observations
  99. GRB 051213: Swift-BAT refined analysis
  100. GRB051211B: XRT refined analysis

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