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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"

7309 results found.

  1. Swift UVOT observations of GRB060213
  2. GRB 060213: optical afterglow candidate
  3. GRB060213: Swift XRT observations and possible afterglow candidate
  4. GRB060213: MASTER final result
  5. GRB060213:_MASTER_optical_observation
  6. GRB 050826: Optical Afterglow and Host Galaxy
  7. GRB 060210: Optical Observations
  8. GRB060211.7: MASTER_optical_observation under the snow
  9. GRB 060211B: Swift-BAT detection of a burst
  10. GRB 060211: Swift detection of a long burst
  11. GRB060210:Faulkes Telescope North Afterglow Confirmation
  12. GRB 060210: candidate afterglow
  13. GRB 060210: Swift detection of a burst
  14. GRB060209A: MASTER optical observation
  15. GRB 060209(?): Swift-BAT detection of a possible burst
  16. GRB 060203: Swift/UVOT upper limits
  17. Retraction of orphan GRB afterglow candidate
  18. Orphan GRB Afterglow candidate
  19. GRB 060204A: ROSAT Pointing
  20. GRB060206: Liverpool Telescope observation
  21. GRB 060206: RAPTOR observations of afterglow candidate variability.
  22. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  23. GRB060206: Swift-BAT detection of a burst
  24. GRB 060204b: Keck/LRIS Afterglow Confirmation
  25. GRB 060204C: Liverpool Telescopes optical limit
  26. GRB 060204C: Swift-BAT detection of a burst
  27. GRB060204B: Faulkes OT candidate
  28. GRB 060204B: Swift detection of a burst
  29. GRB 060203: P60 Confirmation of Optical Afterglow
  30. Possible GRB 060203: candidate optical counterpart
  31. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  32. GRB 060202: Swift/UVOT upper limits
  33. GRB060202: Faulkes North observation
  34. GRB 060202: Swift detection of a burst
  35. GRB 051211A: MDM Observations
  36. GRB050121b: optical observation
  37. GRB 060124: Confirmation of the Afterglow
  38. GRB 060124: XRT position
  39. GRB 060124: Optical Afterglow Candidate from Tautenburg
  40. GRB 060124: Optical Observations at Tautenburg
  41. GRB060124:MASTER optical observation
  42. GRB 060121: Liverpool Telescopes optical limits
  43. GRB 060121: candidate optical counterpart
  44. GRB 060116: PROMPT Observations
  45. GRB 060117: FRAM refined analysis
  46. GRB 060117: FRAM optical afterglow candidate
  47. GRB 060117: nearby galaxy
  48. GRB 060116: VLT optical observations
  49. GRB 060116: IR Candidate Afterglow
  50. GRB060116: Faulkes North observation
  51. GRB 060116: Swift-BAT detection of a burst
  52. GRB 060115: OT photometry with MITSuME
  53. GRB 060115: Swift/UVOT upper limits
  54. GRB 060115: MITSuME optical afterglow candidate
  55. GRB 060115: Swift detection of a burst
  56. GRB060114: Faulkes North observation
  57. GRB060108: Faulkes North afterglow evidence
  58. GRB 060111A: refined UVOT anaysis
  59. GRB 060111B: MITSuME detection of optical afterglow
  60. GRB060111A: RTT150 optical observations
  61. GRB 060111B: Swift detection of a burst
  62. GRB060111.2:_MASTER optical limit
  63. GRB 060111: possible UVOT counterpart
  64. GRB 060111: Swift detection of a burst
  65. GRB 060110: Mitsume optical observations
  66. GRB 060110: IR Candidate Afterglow
  67. GRB 060110: Super-LOTIS observations
  68. GRB 060110: Optical observation
  69. GRB 060110: Correction
  70. GRB 060110: Optical limit
  71. GRB 060109: Swift Detection of a long burst
  72. GRB060108: Faulkes Telescope observation
  73. GRB060108: Swift detection of its 100th GRB
  74. GRB 060105: Swift/UVOT upper limits
  75. GRB 060102 - no XRT afterglow
  76. GRB060105 : Kiso optical observation
  77. GRB060105: Swift detection of a bright long burst
  78. Swift-BAT trigger 175653 is not an astrophysical source
  79. GRB051211B: optical observations
  80. GRB 051221B: Optical Observations with Kuiper 1.54m
  81. GRB 051227: optical observation
  82. GRB 051227: P60 Observations
  83. GRB 051227: R-band object in the XRT error circle
  84. GRB 051227: Swift detection of a burst
  85. GRB051117B: optical observation
  86. GRB 051221: Continued fading of optical afterglow
  87. GRB 051221A: RAPTOR Fading Counterpart Constraint
  88. Swift-BAT detection of a possible burst
  89. GRB 051221: Swift/UVOT upper limits
  90. GRB 051221: Swift detection of a bright short burst
  91. GRB051211A: possible optical candidate
  92. GRB 051215: A short GRB in a cluster?
  93. GRB 051211B: Swift XRT confirmation of the afterglow
  94. GRB051211B: Liverpool Telescope observation
  95. GRB 051211b: RTT150 optical observations
  96. GRB 051211B: Swift XRT Observations
  97. GRB 051211B: a possible optical detection by TAROT
  98. GRB051111: Rc optical observations
  99. GRB 051117B: Swift detection of a burst
  100. Faulkes Telescope R-band detection of GRB051111

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