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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"

26515 results found.

  1. GRB 051221B: BOOTES optical observations.
  2. Swift-BAT detection of a possible burst
  3. GRB 051221: Swift XRT refined analysis
  4. GRB 051221: Swift/UVOT upper limits
  5. GRB 051221: No variability in Gemini data
  6. GRB 051221: Improved astrometry of the IR counterpart
  7. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  8. GRB 051221: Swift detection of a bright short burst
  9. Swift detection of an RS CVn flare star
  10. GRB051211A: possible optical candidate
  11. GRB 051215: near-infrared observations
  12. GRB051215 - SDSS pre-burst observations
  13. GRB 051215: Swift detection of a possible burst
  14. GRB051105: optical observations
  15. GRB 051213: Swift-BAT refined analysis
  16. GRB051211B: XRT refined analysis
  17. GRB 051211B, optical observation
  18. GRB 051211A: Swift/UVOT upper limits
  19. GRB 051211B: Swift/UVOT upper limits
  20. GRB 051211A,optical observation
  21. GRB051211B: Liverpool Telescope observation
  22. GRB051211b: P60 Observations
  23. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  24. GRB 051210: Swift/UVOT upper limits
  25. GRB 051210: Magellan Imaging
  26. GRB 051211: TAROT optical limits
  27. GRB 051211B: a possible optical detection by TAROT
  28. GRB 051211:IAC80 optical observations
  29. GRB 051210: SALT detection limit
  30. GRB 051210: Swift XRT refined analysis
  31. GRB 051210: FRAM early limit
  32. GRB 051210: Swift-BAT refined analysis of a short burst
  33. GRB051210: Swift UVOT Observation
  34. GRB 051210: Swift detection of a burst
  35. An extraordinary long burst on December 3 from SGR1806-20
  36. Possible resuming of the SGR 1806-20 activity
  37. GRB051117B: Swift XRT refined analysis
  38. GRB051117b: No Swift/UVOT Detection
  39. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  40. GRB 051117A: Swift/UVOT Detection of an Afterglow
  41. GRB051111: Suzaku WAM observation of the prompt emission
  42. GRB051008: Suzaku WAM observation of the prompt emission
  43. GRB 051117B: R and I observations of possible host galaxy
  44. GRB 051117A: Refined analysis of the Swift-BAT burst
  45. GRB 051117B: Refined analysis of the Swift-BAT burst
  46. GRB 051117B,optical observation
  47. GRB 051117B: Lulin R and I band observation
  48. GRB051114: results of the Swift-XRT observation
  49. GRB 051109B : Nainital upper limits
  50. GRB 051114: Radio Observations
  51. GRB 051114: Swift-BAT refined analysis
  52. GRB050925: analysis of the XMM-Newton observation
  53. GRB 051114: Swift-BAT detection of a short burst
  54. GRB 051111: Further spectroscopic analysis
  55. GRB 051111: Radio afterglow
  56. GRB 051113: Swift-BAT refined analysis
  57. GRB051103: Radio Observations
  58. GRB/SGR 050925: XMM-Newton ToO observation
  59. GRB051111: Swift/UVOT Observations
  60. GRB051111: XRT preliminary analysis
  61. GRB 051111: Swift-BAT refined analysis
  62. GRB 051109A Optical Observations
  63. GRB 051111A : Lulin BVRI multi band afterglow observation
  64. GRB051111a: SARA Observations
  65. GRB 051111a: IR photometry
  66. GRB 051109B. Radio Observations
  67. GRB 051109A
  68. GRB051109A - radio observations
  69. GRB 051109B: Swift-BAT refined analysis
  70. GRB 051109A: Swift-UVOT Observations
  71. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  72. GRB051109B: no UVOT source detected
  73. GRB051109B: XRT refined analysis
  74. GRB 051109B : Lulin Optical Observations
  75. GRB 051109A : Lulin BVRI Optical afterglow observation
  76. GRB051109A: further steepening in the X-ray light curve
  77. GRB051109A: XRT refined analysis
  78. GRB 051109B: Super-LOTIS Observations
  79. GRB051105B: REM Optical observation
  80. GRB 051109B: Swift detection of a burst
  81. GRB 051109: Rc and Ic observations
  82. GRB 051109: Swift-BAT refined analysis
  83. GRB 051109a: IR Photometry and Astrometry
  84. GRB051109: Swift detection of a burst
  85. GRB 051109a: IR Detections
  86. GRB051105B: Swift/XRT upper limit
  87. GRB051105B: Swift/UVOT upper limit
  88. GRB051103: MASTER: OT limit and host galaxy candidates
  89. GRB051028: Swift-XRT refined analysis
  90. GRB 051105a, observation from Naini Tal and OSN
  91. GRB 051105a: MDM Observations
  92. GRB 051105A: TNG optical observations
  93. GRB051105A: Swift/UVOT Observations
  94. GRB 051105A, radio observations
  95. GRB051103:_MASTER_optical_observations
  96. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  97. GRB 051105A, optical observations
  98. XRT observations of GRB 051105A
  99. GRB 051105b: ART optical limits
  100. GRB 051105B (INTEGRAL 2701): Optical observation

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