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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"

20350 results found.

  1. GRB051211A: possible optical candidate
  2. GRB 051215: near-infrared observations
  3. GRB051215 - SDSS pre-burst observations
  4. GRB 051215: Swift detection of a possible burst
  5. GRB 051211B, optical observation
  6. GRB 051211A: Swift/UVOT upper limits
  7. GRB 051211B: Swift/UVOT upper limits
  8. GRB 051211A,optical observation
  9. GRB051211B: Liverpool Telescope observation
  10. GRB051211b: P60 Observations
  11. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  12. GRB 051210: Swift/UVOT upper limits
  13. GRB 051210: Magellan Imaging
  14. GRB 051211: TAROT optical limits
  15. GRB 051211B: a possible optical detection by TAROT
  16. GRB 051211:IAC80 optical observations
  17. GRB 051210: SALT detection limit
  18. GRB 051210: Swift XRT refined analysis
  19. GRB 051210: FRAM early limit
  20. GRB051210: Swift UVOT Observation
  21. GRB 051210: Swift detection of a burst
  22. Swift XRT positions
  23. An extraordinary long burst on December 3 from SGR1806-20
  24. GRB051117B: Swift XRT refined analysis
  25. GRB051117b: No Swift/UVOT Detection
  26. GRB 051117A: Swift/UVOT Detection of an Afterglow
  27. GRB 051117B: R and I observations of possible host galaxy
  28. GRB 051117B,optical observation
  29. GRB051114: results of the Swift-XRT observation
  30. GRB 051109B : Nainital upper limits
  31. GRB 051114: Radio Observations
  32. GRB 051114: Swift-BAT refined analysis
  33. GRB050925: analysis of the XMM-Newton observation
  34. GRB 051111: Further spectroscopic analysis
  35. GRB 051111: Radio afterglow
  36. GRB051103: Radio Observations
  37. GRB 051109A Milagro GeV/TeV Observations
  38. GRB051111: Swift/UVOT Observations
  39. GRB051111: XRT preliminary analysis
  40. GRB 051109A Optical Observations
  41. GRB 051111a: IR photometry
  42. GRB 051103 Milagro GeV/TeV Observations
  43. GRB 051109B. Radio Observations
  44. GRB 051109A
  45. GRB051109A - radio observations
  46. GRB 051109A: Swift-UVOT Observations
  47. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  48. GRB051109B: no UVOT source detected
  49. GRB051109B: XRT position
  50. GRB 051109B: Super-LOTIS Observations
  51. GRB051105B: REM Optical observation
  52. GRB 051109: Rc and Ic observations
  53. GRB 051109a: IR Photometry and Astrometry
  54. GRB051109: Swift detection of a burst
  55. GRB 051109a: IR Detections
  56. GRB051105B: Swift/XRT upper limit
  57. GRB051105B: Swift/UVOT upper limit
  58. GRB051103: MASTER: OT limit and host galaxy candidates
  59. GRB 051105a, observation from Naini Tal and OSN
  60. GRB 051105a: MDM Observations
  61. GRB 051105A: TNG optical observations
  62. GRB051105A: Swift/UVOT Observations
  63. GRB 051105A, radio observations
  64. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  65. XRT observations of GRB 051105A
  66. GRB 051105: Swift detection of a short burst
  67. Recent GRB UBVRcIc field photometry
  68. GRB051028 SARA Observation
  69. GRB051028: Swift/UVOT upper limits
  70. GRB051028: Swift XRT Position
  71. GRB051028:MASTER observations
  72. GRB051022: Swift XRT measurement of jet break
  73. GRB051021B: Swift/UVOT Upper limits
  74. GRB 051021, Optical Observations
  75. GRB051012: Swift-XRT analysis
  76. GRB 051022, mm counterpart
  77. GRB 051022: Swift/UVOT Upper Limits
  78. GRB051022: Radio Counterpart
  79. GRB051022: IR observations
  80. GRB051021A: Swift XRT refined analysis
  81. Konus-Wind observation of GRB 051022
  82. GRB051022: Optical Observations
  83. GRB051021b: Magellan IR Imaging
  84. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  85. GRB051022: Swift XRT Position
  86. GRB 051021: P200 Ks Observations
  87. GRB 051022 (=H3950): SXC Flight Localization is Valid
  88. GRB051021: Swift/UVOT Upper Limits
  89. GRB 051022: SSO40 Optical Observations
  90. GRB051022,optical observation
  91. GRB 051021,optical observation
  92. GRB051021B: Swift XRT Position
  93. GRB 051021B: Swift detection of a burst
  94. GRB051021: Swift XRT analysis
  95. Swift-BAT triggered on a posible CR Shower or possible GRB
  96. Afterglow candidate of GRB 051016B observed at Lulin
  97. GRB 051016b: Gemini Near IR Observations
  98. GRB 051016A: Swift/UVOT upper limits
  99. GRB 051016B: Swift/UVOT detection
  100. GRB 051016B,optical observation

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