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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"

19543 results found.

  1. GRB 060111B: Swift detection of a burst
  2. GRB 060111: Swift-BAT Refined Analysis
  3. GRB 060108: VLT K-band observations
  4. GRB 060111: TAROT optical observation
  5. GRB 060111: possible UVOT counterpart
  6. GRB 060111: Swift detection of a burst
  7. GRB 060110: Mitsume optical observations
  8. GRB 060108: z-band imaging from Gemini-North
  9. GRB 060110a: RAPTOR detection of early optical emission.
  10. GRB 060110: UKIRT K-band observations
  11. GRB 060110: IR Candidate Afterglow
  12. GRB060110, optical observation
  13. GRB 060110: Correction
  14. GRB 050110: IR Observations
  15. GRB 060109: Swift/UVOT upper limits
  16. GRB060109, optical observation
  17. GRB 060108: ISAS early observations and near IR upper limit
  18. GRB060108: P200 Ks Observations
  19. GRB 060108: early UKIRT K-band observations
  20. GRB 060109: Swift Detection of a long burst
  21. GRB 060108: VLT J-band observations
  22. GRB 060108: Mitsume optical observations
  23. GRB 060108: Swift/UVOT upper limits
  24. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  25. GRB060108: SDSS pre-burst observations
  26. GRB060108: Faulkes Telescope observation
  27. GRB060108, optical observation
  28. GRB060108: Swift detection of its 100th GRB
  29. GRB 060105: ISAS observations and near IR upper limit
  30. GRB 060105: Swift/UVOT upper limits
  31. GRB 060105: Mitsume optical observations
  32. GRB060105: Suzaku-XIS and -HXD observation plan
  33. GRB060105, optical observation
  34. GRB060105: Swift detection of a bright long burst
  35. Swift-BAT trigger 175653 is probably not a GRB
  36. GRB 051221B: Optical Observations with Kuiper 1.54m
  37. GRB 051227: optical observation
  38. GRB 051227: optical afterglow
  39. GRB 051227: Magellan r'-band Imaging/Astrometry
  40. GRB 051227: refined analysis of VLT images
  41. GRB 051227: P60 Observations
  42. GRB 051227: MDM Observation
  43. GRB 051227: R-band object in the XRT error circle
  44. GRB 051227: Refined analysis of the Swift-BAT burst
  45. GRB051227: SDSS pre-burst observations
  46. GRB 051227, optical observation
  47. GRB 051227: Swift detection of a burst
  48. GRB051117B: optical observation
  49. GRB 051221A: MDM Optical Observations
  50. GRB051016: analysis of the XMM-Newton observation
  51. GRB 051221B: TAROT optical limits
  52. Swift-BAT detection of a possible burst
  53. GRB 051221: Swift/UVOT upper limits
  54. GRB 051221: Improved astrometry of the IR counterpart
  55. GRB 051221: Swift detection of a bright short burst
  56. Swift detection of an RS CVn flare star
  57. GRB051211A: possible optical candidate
  58. GRB 051215: near-infrared observations
  59. GRB051215 - SDSS pre-burst observations
  60. GRB 051215: Swift detection of a possible burst
  61. GRB 051211B, optical observation
  62. GRB 051211A: Swift/UVOT upper limits
  63. GRB 051211B: Swift/UVOT upper limits
  64. GRB 051211A,optical observation
  65. GRB 051211B: Swift XRT confirmation of the afterglow
  66. GRB051211B: Liverpool Telescope observation
  67. GRB051211b: P60 Observations
  68. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  69. GRB 051210: Swift/UVOT upper limits
  70. GRB 051210: Magellan Imaging
  71. GRB 051211: TAROT optical limits
  72. GRB 051211B: a possible optical detection by TAROT
  73. GRB 051211B: a long GRB detected by INTEGRAL
  74. GRB 051211:IAC80 optical observations
  75. GRB 051210: SALT detection limit
  76. GRB 051210: FRAM early limit
  77. GRB 051210: Swift-BAT refined analysis of a short burst
  78. GRB051210: Swift UVOT Observation
  79. GRB 051210: A short GRB in a cluster?
  80. GRB 051210: Swift detection of a burst
  81. An extraordinary long burst on December 3 from SGR1806-20
  82. GRB051117b: No Swift/UVOT Detection
  83. GRB 051117A: Swift/UVOT Detection of an Afterglow
  84. GRB 051117B: R and I observations of possible host galaxy
  85. GRB 051117B: Refined analysis of the Swift-BAT burst
  86. GRB 051117B,optical observation
  87. GRB 051117: Swift detection of a bright burst
  88. GRB051114: results of the Swift-XRT observation
  89. GRB 051109B : Nainital upper limits
  90. GRB 051114: Radio Observations
  91. GRB050925: analysis of the XMM-Newton observation
  92. GRB 051111: Radio afterglow
  93. GRB051103: Radio Observations
  94. GRB 051109A Milagro GeV/TeV Observations
  95. GRB051111: Swift/UVOT Observations
  96. GRB 051109A Optical Observations
  97. GRB 051111a: IR photometry
  98. GRB 051109B. Radio Observations
  99. GRB 051109A
  100. GRB051109A - radio observations

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