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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"

5814 results found.

  1. GRB 060211: Swift detection of a long burst
  2. GRB060210: Swift XRT Refined Analysis
  3. GRB 060210: Swift detection of a burst
  4. Swift-BAT trigger 180931 is not a GRB
  5. GRB060209: RTT150 optical observations
  6. GRB 060209 : TAROT optical observation
  7. GRB060209A: MASTER optical observation
  8. GRB 060206: TTT Observations
  9. GRB 060206: Super-LOTIS observations
  10. GRB060204C: optical observation
  11. GRB060204B, optical observation
  12. GRB 060202: GETS observation
  13. GRB060202, optical observation
  14. GRB 060202: Swift/UVOT upper limits
  15. GRB 060121: Gemini Late-time Observations
  16. GRB 060130, SMARTS optical observations
  17. GRB 060130: FRAM optical observations
  18. GRB060124: detailed XRT analysis
  19. GRB 060116: MARGE optical observations
  20. GRB 060121: candidate optical counterpart
  21. GRB060121 - SDSS pre-burst observations
  22. GRB 060116: IR Candidate Afterglow
  23. GRB 060116: Swift-BAT detection of a burst
  24. GRB 060115: Swift/UVOT upper limits
  25. GRB 060115: Swift detection of a burst
  26. GRB060108: Faulkes North afterglow evidence
  27. GRB 060110: MARGE observations
  28. GRB 060111B: Swift detection of a burst
  29. GRB060110, optical observation
  30. GRB 060109: Swift/UVOT upper limits
  31. GRB060109, optical observation
  32. GRB 060109: Swift Detection of a long burst
  33. GRB060108: SDSS pre-burst observations
  34. GRB 060105: Mitsume optical observations
  35. GRB060105, optical observation
  36. GRB060105 : Kiso optical observation
  37. GRB051211B: optical observations
  38. GRB 051221B: ROTSE-III Optical Limits
  39. Refined analysis of the SWIFT J1626.6-5156
  40. Swift detection of an RS CVn flare star
  41. GRB051105: optical observations
  42. Possible resuming of the SGR 1806-20 activity
  43. GRB051117A : XRT refined analysis
  44. GRB 051117B: Swift detection of a burst
  45. GRB 051109B : Nainital upper limits
  46. GRB 051114: Swift-BAT refined analysis
  47. GRB 051114: Swift-BAT detection of a short burst
  48. GRB 051105a: GETS optical limit
  49. GRB 051109b: GETS observation
  50. GRB 051109A: KAIT optical observations
  51. GRB 051109A: Swift-UVOT Observations
  52. GRB 051109B Kiso optical follow-up observation
  53. GRB 051109a: IR Photometry and Astrometry
  54. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  55. GRB 051109a: IR Detections
  56. GRB051103: MASTER: OT limit and host galaxy candidates
  57. GRB051103:_MASTER_optical_observations
  58. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  59. GRB 051105: Optical limit
  60. GRB051028:MASTER observations
  61. GRB051021a: optical observations
  62. GRB051021A: Swift XRT refined analysis
  63. GRB051022,optical observation
  64. GRB 051022: Optical observations
  65. GRB 051021B: Swift detection of a burst
  66. GRB051021: Swift XRT analysis
  67. GRB 051016B: Swift detection of a soft burst
  68. GRB051006: optical observations
  69. GRB050805A: Rc optical observations
  70. GRB 051006: XRT refined analysis
  71. GRB 051006: optical observations at Sierra Nevada
  72. GRB 051006: XRT position
  73. GRB/SGR 050925: IR Observations
  74. GRB050922C - Swift UVOT preliminary analysis
  75. GRB050925: Swift UVOT upper limits
  76. GRB050925: Swift-BAT detection of a short burst
  77. GRB050922C: Optical Observations
  78. GRB 050922C: Swift XRT refined analysis
  79. GRB 050922C: Swift-BAT refined analysis
  80. GRB 050922B: Swift-BAT refined analysis
  81. GRB 050922C: NOT optical observations
  82. GRB 050922C: Swift detection of a bright burst
  83. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  84. GRB050916: Swift/UVOT Upper Limits
  85. GRB 050916: XRT position
  86. GRB 050915b, SMARTS optical/IR observations of the XRT position
  87. GRB 050915a: IR Transient
  88. GRB 050915b, SMARTS optical/IR observations
  89. GRB 050915: IR Observations
  90. GRB 050915: Swift detection of a GRB
  91. GRB 050910a: TAROT early optical limits
  92. GRB 050908: Optical observations
  93. GRB050904: Optical Observations
  94. GRB 050904: TAROT optical limits
  95. GRB 050827: P200 NIR Observations
  96. GRB 050827: Optical Limit
  97. GRB050824: MASTER final analysis of the OT observations
  98. GRB050820A: RTT150 optical observations
  99. GRB050820a: PROMPT RcIc Observations
  100. GRB050815: Optical afterglow detection by Swift UVOT

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