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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"

20417 results found.

  1. GRB 060115: Swift detection of a burst
  2. GRB060114, optical observation
  3. GRB060114: Faulkes North observation
  4. GRB 060108: IR observations of afterglow
  5. GRB 060108: Evidence for an XRT Position Offset
  6. GRB 060110: KAIT observations
  7. GRB 060111B: MITSuME detection of optical afterglow
  8. GRB 060111B: TAROT optical observation
  9. GRB060111A: RTT150 optical observations
  10. GRB060111B: RTT150, possible host galaxy
  11. GRB 060111B: Refined analysis of the Swift-BAT burst
  12. GRB 060111(a): P60 Observations
  13. GRB 060111B: Gualba observatory limit
  14. GRB 060111B: Swift detection of a burst
  15. GRB 060108: VLT K-band observations
  16. GRB 060111: TAROT optical observation
  17. GRB 060111: Swift detection of a burst
  18. GRB 060110: Mitsume optical observations
  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. GRB 050110: IR Observations
  26. GRB 060109: Swift/UVOT upper limits
  27. GRB060109, optical observation
  28. GRB 060108: ISAS early observations and near IR upper limit
  29. GRB060108: P200 Ks Observations
  30. GRB 060108: early UKIRT K-band observations
  31. GRB 060108: VLT J-band observations
  32. GRB 060108: Mitsume optical observations
  33. GRB 060108: Swift/UVOT upper limits
  34. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  35. GRB060108: SDSS pre-burst observations
  36. GRB060108: Faulkes Telescope observation
  37. GRB060108, optical observation
  38. GRB 060108: Refined analysis of the Swift-BAT burst
  39. GRB060108: Swift detection of its 100th GRB
  40. GRB 060105: ISAS observations and near IR upper limit
  41. GRB 060105: Swift/UVOT upper limits
  42. GRB 060105: Mitsume optical observations
  43. GRB 060105: XRT refined analysis
  44. GRB060105: Suzaku-XIS and -HXD observation plan
  45. GRB060105, optical observation
  46. GRB060105: Swift detection of a bright long burst
  47. Swift-BAT trigger 175653 is probably not a GRB
  48. GRB 051221B: Optical Observations with Kuiper 1.54m
  49. GRB 051227: optical observation
  50. GRB 051227: optical afterglow
  51. GRB 051227: Magellan r'-band Imaging/Astrometry
  52. GRB 051227: refined analysis of VLT images
  53. GRB 051227: P60 Observations
  54. GRB 051227: MDM Observation
  55. GRB 051227: R-band object in the XRT error circle
  56. GRB051227: SDSS pre-burst observations
  57. GRB 051227, optical observation
  58. GRB 051227: Swift detection of a burst
  59. GRB051117B: optical observation
  60. Konus-Wind observation of GRB 051221A
  61. GRB 051221A: MDM Optical Observations
  62. GRB 051221B: TAROT optical limits
  63. Swift-BAT detection of a possible burst
  64. GRB 051221: Swift/UVOT upper limits
  65. GRB 051221: Improved astrometry of the IR counterpart
  66. GRB 051221: Swift detection of a bright short burst
  67. Swift detection of an RS CVn flare star
  68. GRB051211A: possible optical candidate
  69. GRB 051215: near-infrared observations
  70. GRB051215 - SDSS pre-burst observations
  71. GRB 051215: Swift detection of a possible burst
  72. GRB 051211B, optical observation
  73. GRB 051211A: Swift/UVOT upper limits
  74. GRB 051211B: Swift/UVOT upper limits
  75. GRB 051211A,optical observation
  76. GRB051211B: Liverpool Telescope observation
  77. GRB051211b: P60 Observations
  78. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  79. GRB 051210: Swift/UVOT upper limits
  80. GRB 051210: Magellan Imaging
  81. GRB 051211: TAROT optical limits
  82. GRB 051211B: a possible optical detection by TAROT
  83. GRB 051211:IAC80 optical observations
  84. GRB 051210: SALT detection limit
  85. GRB 051210: Swift XRT refined analysis
  86. GRB 051210: FRAM early limit
  87. GRB051210: Swift UVOT Observation
  88. GRB 051210: Swift detection of a burst
  89. Swift XRT positions
  90. An extraordinary long burst on December 3 from SGR1806-20
  91. GRB051117B: Swift XRT refined analysis
  92. GRB051117b: No Swift/UVOT Detection
  93. GRB 051117A: Swift/UVOT Detection of an Afterglow
  94. GRB 051117B: R and I observations of possible host galaxy
  95. GRB 051117B,optical observation
  96. GRB051114: results of the Swift-XRT observation
  97. GRB 051109B : Nainital upper limits
  98. GRB 051114: Radio Observations
  99. GRB 051114: Swift-BAT refined analysis
  100. GRB050925: analysis of the XMM-Newton observation

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