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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"

19770 results found.

  1. GRB051111: Suzaku WAM observation of the prompt emission
  2. GRB051008: Suzaku WAM observation of the prompt emission
  3. GRB 051109B: GAO 150cm telescope Optical limit
  4. GRB 051117B: R and I observations of possible host galaxy
  5. GRB 051117B,optical observation
  6. GRB 051117B: ROTSE-III Optical Limits
  7. GRB051114: results of the Swift-XRT observation
  8. GRB 051109B : Nainital upper limits
  9. GRB 051114: Radio Observations
  10. GRB050925: analysis of the XMM-Newton observation
  11. GRB 051111: Radio afterglow
  12. GRB051103: Radio Observations
  13. GRB051111: Swift/UVOT Observations
  14. GRB051111: XRT preliminary analysis
  15. GRB 051109A Optical Observations
  16. GRB 051111a: IR photometry
  17. GRB 051109B. Radio Observations
  18. GRB 051109A
  19. GRB051109A - radio observations
  20. Early RAPTOR measurements of GRB 051109a - the movie.
  21. GRB 051109B: ROTSE-III Optical Limits
  22. GRB 051109A: Swift-UVOT Observations
  23. GRB051109B: no UVOT source detected
  24. GRB 051109B: Super-LOTIS Observations
  25. GRB051105B: REM Optical observation
  26. GRB 051109: PROMPT Detections
  27. GRB 051109: Rc and Ic observations
  28. GRB 051109: Swift-BAT refined analysis
  29. GRB 051109a: IR Photometry and Astrometry
  30. GRB051109: Swift detection of a burst
  31. GRB 051109a: IR Detections
  32. GRB051105B: Swift/XRT upper limit
  33. GRB051105B: Swift/UVOT upper limit
  34. GRB 051105a, observation from Naini Tal and OSN
  35. GRB 051105a: MDM Observations
  36. GRB 051105A: TNG optical observations
  37. GRB051105A: Swift/UVOT Observations
  38. GRB 051105A, radio observations
  39. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  40. XRT observations of GRB 051105A
  41. GRB 051105b: ART optical limits
  42. GRB051105B - A long GRB detected by INTEGRAL
  43. GRB 051105: Optical limit
  44. GRB 051105: Swift detection of a short burst
  45. Recent GRB UBVRcIc field photometry
  46. GRB051028 SARA Observation
  47. GRB051028: Swift/UVOT upper limits
  48. GRB051028: Swift XRT Position
  49. GRB051021B: Swift/UVOT Upper limits
  50. GRB 051021, Optical Observations
  51. GRB 051022, refined optical astrometry
  52. GRB051012: Swift-XRT analysis
  53. GRB 051022: Swift/UVOT Upper Limits
  54. GRB051022: Radio Counterpart
  55. GRB051022: IR observations
  56. GRB051021A: Swift XRT refined analysis
  57. Konus-Wind observation of GRB 051022
  58. GRB051022: Optical Observations
  59. GRB 051021: PROMPT RcIc Observations
  60. GRB051021b: Magellan IR Imaging
  61. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  62. GRB051022: Swift XRT Position
  63. GRB 051021: P200 Ks Observations
  64. GRB 051021: MDM Upper Limit
  65. GRB 051022 (=H3950): SXC Flight Localization is Valid
  66. GRB051021: Swift/UVOT Upper Limits
  67. GRB 051022: SSO40 Optical Observations
  68. GRB051022,optical observation
  69. GRB 051022A: ROTSE-III Optical Limits
  70. GRB 051022: Optical observations
  71. GRB 051021,optical observation
  72. GRB 051021B: Swift detection of a burst
  73. Swift-BAT triggered on a posible CR Shower or possible GRB
  74. Afterglow candidate of GRB 051016B observed at Lulin
  75. GRB 051016A: Swift/UVOT upper limits
  76. GRB 051016B: Swift/UVOT detection
  77. GRB 051016B,optical observation
  78. GRB 051016B: Swift detection of a soft burst
  79. GRB051016 XMM-Newton observation
  80. GRB 051016: PROMPT Observations
  81. GRB051016: Swift detection of a burst
  82. GRB051006: optical observations
  83. GRB 051012: Swift-BAT detection of burst yesterday
  84. GRB 051006: Swift/UVOT Upper Limits
  85. GRB051011: MASTER optical observation
  86. Konus-Wind observation of GRB 051008
  87. GRB051008: Radio Observation
  88. GRB 051008, optical observations
  89. GRB 051008: early Swift XRT analysis
  90. GRB 051008: Swift UVOT Candidate
  91. GRB 051006: P60 Observations
  92. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  93. GRB051006: Refined analysis of the Swift-BAT burst
  94. GRB051006: Swift detection of a burst
  95. GRB 050906, summary of radio observations
  96. GRB051001: Swift UVOT Upper Limits
  97. GRB 051001: AAT infra-red observations
  98. GRB 051001: Swift Detection of a Burst
  99. GRB 051001: ROTSE-III Optical Limits
  100. GRB 050820A: NIR photometry at the TNG

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