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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

41972 results found.

  1. GRB 060110: Correction
  2. GRB 050110: IR Observations
  3. GRB 060110: Swift-BAT detection of a burst
  4. GRB 060109: Refined Swift-XRT analysis
  5. GRB 060109: Swift/UVOT upper limits
  6. GRB060109, optical observation
  7. GRB 060108: ISAS early observations and near IR upper limit
  8. GRB060108: P200 Ks Observations
  9. GRB 060108: early UKIRT K-band observations
  10. GRB 060109: Swift Detection of a long burst
  11. GRB 060108: a dark burst?
  12. GRB 060108: Refined XRT analysis
  13. GRB 060108: VLT J-band observations
  14. GRB 060108: Mitsume optical observations
  15. GRB 060108: Swift/UVOT upper limits
  16. GRB060108: SDSS pre-burst observations
  17. GRB060108: Faulkes Telescope observation
  18. GRB060108, optical observation
  19. GRB 060108: Refined analysis of the Swift-BAT burst
  20. GRB 060108: Swift XRT position
  21. GRB060108: Swift detection of its 100th GRB
  22. GRB 060105: Radio observations
  23. GRB 060105: MDM Observation
  24. Konus-Wind observation of GRB 060105
  25. GRB 060105: ISAS observations and near IR upper limit
  26. GRB 060105: Mitsume optical observations
  27. GRB 060105: BAT refined analysis
  28. GRB 060102 - no XRT afterglow
  29. GRB 060105: XRT refined analysis
  30. GRB060105: Suzaku-XIS and -HXD observation plan
  31. GRB060105, optical observation
  32. GRB060105 : Kiso optical observation
  33. GRB060105: Swift detection of a bright long burst
  34. GRB 060102: MDM Observation
  35. Swift-BAT trigger 175653 is probably not a GRB
  36. GRB 060102: Swift-BAT refined analysis
  37. GRB 060102: Swift-BAT detection of a burst
  38. GRB051211B: optical observations
  39. GRB051227: SARA Observations
  40. GRB 051221B: Optical Observations with Kuiper 1.54m
  41. GRB 051227: Likely host galaxy underlying afterglow position
  42. GRB 051227: optical observation
  43. GRB051221B: Radio observations
  44. GRB 051221A: VLA Radio Observations
  45. GRB051227: Radio Observations
  46. GRB 051227: Confirmed fading from Gemini observations
  47. GRB051227: further analysis of VLT images
  48. GRB 051227: optical afterglow
  49. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  50. GRB 051227: Gemini observations
  51. GRB 051227: Keck Spectroscopy
  52. GRB 051227: Magellan r'-band Imaging/Astrometry
  53. GRB 051227: refined analysis of VLT images
  54. GRB 051227: P60 Observations
  55. GRB 051227: MDM Observation
  56. GRB 051227: R-band object in the XRT error circle
  57. GRB 051227: Joint Swift-HETE Spectral Analysis
  58. GRB 051227: XRT refined analysis
  59. GRB 051227: Further analysis of the Swift-BAT burst
  60. GRB 051227: Refined analysis of the Swift-BAT burst
  61. GRB051227: SDSS pre-burst observations
  62. GRB 051227, optical observation
  63. GRB 051227: Swift detection of a burst
  64. GRB051117B: optical observation
  65. Konus-Wind observation of GRB 051221A
  66. GRB051221A: Suzaku WAM observation of the prompt emission
  67. GRB 051221A: MDM Optical Observations
  68. GRB051016: analysis of the XMM-Newton observation
  69. GRB 051221A: Detection at 251nm with Swift UVOT
  70. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  71. GRB 051221B: TAROT optical limits
  72. GRB 051221A: WSRT Radio Observations
  73. GRB 051221: Redshift from Gemini
  74. GRB 051221: Continued fading of optical afterglow
  75. GRB 051221B: Refined analysis of the Swift-BAT burst
  76. Possible GRB 051221B: MDM Optical Detection
  77. GRB 051221A: RAPTOR Fading Counterpart Constraint
  78. GRB 051221B: BOOTES optical observations.
  79. Possible GRB 051221B: Swift XRT position
  80. Swift-BAT detection of a possible burst
  81. GRB 051221: Discovery of fading optical afterglow
  82. GRB 051221: Swift XRT refined analysis
  83. GRB 051221: Possible nearby cluster
  84. GRB 051221: Gemini observations
  85. GRB051221: K-band source
  86. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  87. GRB 051221: IR Observations at GRB+1hr
  88. GRB 051221: Swift detection of a bright short burst
  89. Refined analysis of the SWIFT J1626.6-5156
  90. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  91. GRB051211A (=H3979): Refined Analysis
  92. GRB 051211B: optical afterglow
  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. GRB051211B: Probable radio afterglow
  99. GRB051105: optical observations
  100. GRB 051213: Swift-BAT refined analysis

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