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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"

21795 results found.

  1. GRB051215 - SDSS pre-burst observations
  2. GRB 051215: Swift detection of a possible burst
  3. GRB051105: optical observations
  4. GRB 051213: Swift-BAT refined analysis
  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: Optical imaging from Las Campanas
  18. GRB 051210: SALT detection limit
  19. GRB 051210: FRAM early limit
  20. GRB051210: Swift UVOT Observation
  21. GRB 051210: Swift detection of a burst
  22. An extraordinary long burst on December 3 from SGR1806-20
  23. Possible resuming of the SGR 1806-20 activity
  24. GRB051117b: No Swift/UVOT Detection
  25. GRB 051117A: Swift/UVOT Detection of an Afterglow
  26. GRB051111: Suzaku WAM observation of the prompt emission
  27. GRB051008: Suzaku WAM observation of the prompt emission
  28. GRB 051109B: GAO 150cm telescope Optical limit
  29. GRB 051117B: R and I observations of possible host galaxy
  30. GRB 051117B,optical observation
  31. GRB 051117B: ROTSE-III Optical Limits
  32. GRB051114: results of the Swift-XRT observation
  33. GRB 051109B : Nainital upper limits
  34. GRB 051114: Radio Observations
  35. GRB050925: analysis of the XMM-Newton observation
  36. GRB 051111: Radio afterglow
  37. GRB051103: Radio Observations
  38. GRB051111: Swift/UVOT Observations
  39. GRB051111: XRT preliminary analysis
  40. GRB 051109A Optical Observations
  41. GRB 051111a: IR photometry
  42. GRB 051109B. Radio Observations
  43. GRB 051109A
  44. GRB051109A - radio observations
  45. Early RAPTOR measurements of GRB 051109a - the movie.
  46. GRB 051109B: ROTSE-III Optical Limits
  47. GRB 051109A: Swift-UVOT Observations
  48. GRB051109B: no UVOT source detected
  49. GRB 051109B: Super-LOTIS Observations
  50. GRB051105B: REM Optical observation
  51. GRB 051109: PROMPT Detections
  52. GRB 051109: Rc and Ic observations
  53. GRB 051109: Swift-BAT refined analysis
  54. GRB 051109a: IR Photometry and Astrometry
  55. GRB051109: Swift detection of a burst
  56. GRB 051109a: IR Detections
  57. GRB051105B: Swift/XRT upper limit
  58. GRB051105B: Swift/UVOT upper limit
  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 051105b: ART optical limits
  67. GRB051105B - A long GRB detected by INTEGRAL
  68. GRB 051105: Optical limit
  69. GRB 051105: Swift detection of a short burst
  70. Recent GRB UBVRcIc field photometry
  71. GRB051028 SARA Observation
  72. GRB051028: Swift/UVOT upper limits
  73. GRB051028: Swift XRT Position
  74. GRB051021B: Swift/UVOT Upper limits
  75. GRB 051021, Optical Observations
  76. GRB 051022, refined optical astrometry
  77. GRB051012: Swift-XRT analysis
  78. GRB 051022: Swift/UVOT Upper Limits
  79. GRB051022: Radio Counterpart
  80. GRB051022: IR observations
  81. GRB051021A: Swift XRT refined analysis
  82. Konus-Wind observation of GRB 051022
  83. GRB051022: Optical Observations
  84. GRB 051021: PROMPT RcIc Observations
  85. GRB051021b: Magellan IR Imaging
  86. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  87. GRB051022: Swift XRT Position
  88. GRB 051021: P200 Ks Observations
  89. GRB 051021: MDM Upper Limit
  90. GRB 051022 (=H3950): SXC Flight Localization is Valid
  91. GRB051021: Swift/UVOT Upper Limits
  92. GRB 051022: SSO40 Optical Observations
  93. GRB051022,optical observation
  94. GRB 051022A: ROTSE-III Optical Limits
  95. GRB 051022: Optical observations
  96. GRB 051021,optical observation
  97. GRB 051021B: Swift detection of a burst
  98. Swift-BAT triggered on a posible CR Shower or possible GRB
  99. Afterglow candidate of GRB 051016B observed at Lulin
  100. GRB 051016A: Swift/UVOT upper limits

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