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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"

25050 results found.

  1. GRB051008: Suzaku WAM observation of the prompt emission
  2. GRB 051021 Optical Observations
  3. GRB 051117B: R and I observations of possible host galaxy
  4. GRB 051117A: Refined analysis of the Swift-BAT burst
  5. GRB 051117B: Refined analysis of the Swift-BAT burst
  6. GRB051117A : XRT refined analysis
  7. GRB 051117B,optical observation
  8. GRB 051117B: Swift detection of a burst
  9. GRB 051117: Swift detection of a bright burst
  10. GRB051114: results of the Swift-XRT observation
  11. GRB 051028 Optical Observations
  12. GRB 051109B : Nainital upper limits
  13. GRB 051114: Radio Observations
  14. GRB 051114: Swift-BAT refined analysis
  15. GRB050925: analysis of the XMM-Newton observation
  16. GRB 051114: Swift-BAT detection of a short burst
  17. GRB 051111: Further spectroscopic analysis
  18. GRB 051111: Radio afterglow
  19. GRB 051113: Swift-BAT refined analysis
  20. GRB 051113: Swift-BAT detection of a burst
  21. GRB051103: Radio Observations
  22. GRB 051109A Milagro GeV/TeV Observations
  23. GRB/SGR 050925: XMM-Newton ToO observation
  24. GRB051111: Swift/UVOT Observations
  25. GRB051111: XRT preliminary analysis
  26. GRB 051109A Optical Observations
  27. GRB 051111a: IR photometry
  28. Faulkes Telescope R-band detection of GRB051111
  29. GRB 051103 Milagro GeV/TeV Observations
  30. GRB 051109B. Radio Observations
  31. GRB 051109A
  32. GRB051109A - radio observations
  33. Konus-Wind observation of GRB 051109A
  34. GRB 051109A: Swift-UVOT Observations
  35. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  36. GRB051109B: no UVOT source detected
  37. GRB051109B: XRT refined analysis
  38. GRB051109A: further steepening in the X-ray light curve
  39. GRB051109A: XRT refined analysis
  40. GRB 051109B: Super-LOTIS Observations
  41. GRB051105B: REM Optical observation
  42. GRB 051109: Rc and Ic observations
  43. GRB 051109: Swift-BAT refined analysis
  44. GRB 051109a: IR Photometry and Astrometry
  45. GRB051109: Swift detection of a burst
  46. GRB 051109a: IR Detections
  47. GRB051105B: Swift/XRT upper limit
  48. GRB051105B: Swift/UVOT upper limit
  49. GRB051103: MASTER: OT limit and host galaxy candidates
  50. GRB051028: Swift-XRT refined analysis
  51. GRB 051105a, observation from Naini Tal and OSN
  52. GRB 051105a: MDM Observations
  53. GRB 051105A: TNG optical observations
  54. GRB051105A: Swift/UVOT Observations
  55. GRB 051105A, radio observations
  56. GRB051103:_MASTER_optical_observations
  57. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  58. XRT observations of GRB 051105A
  59. GRB 051105b: ART optical limits
  60. GRB051105B - A long GRB detected by INTEGRAL
  61. GRB 051105B (INTEGRAL 2701): Optical observation
  62. GRB 051105: Swift detection of a short burst
  63. Recent GRB UBVRcIc field photometry
  64. Konus-Wind observation of GRB 051028
  65. GRB051028 SARA Observation
  66. GRB051028: Swift/UVOT upper limits
  67. GRB051028: Swift XRT Position
  68. GRB 051028 (=H3951): A GRB localized by HETE
  69. GRB051022: Swift XRT measurement of jet break
  70. SGR 1806-20: continued moderate activity seen with INTEGRAL
  71. GRB051021B: Swift/UVOT Upper limits
  72. GRB 051021, Optical Observations
  73. GRB 051022: XRT Refined Spectral and Temporal Analysis
  74. GRB051012: Swift-XRT analysis
  75. GRB 051022 Chandra Observations scheduled
  76. GRB051021B: Swift XRT refined analysis
  77. GRB051021a: optical observations
  78. GRB 051022, mm counterpart
  79. GRB 051022: Swift/UVOT Upper Limits
  80. GRB051022: Radio Counterpart
  81. GRB051022: IR observations
  82. GRB051021A: Swift XRT refined analysis
  83. Konus-Wind observation of GRB 051022
  84. GRB051022: Optical Observations
  85. GRB051021b: Magellan IR Imaging
  86. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  87. GRB 051022, J & K-band observation
  88. GRB051022: Swift XRT Position
  89. GRB 051021: P200 Ks Observations
  90. GRB 051022 (=H3950): SXC Flight Localization is Valid
  91. GRB051021: Swift/UVOT Upper Limits
  92. GRB 051021B: Refined analysis of the Swift-BAT burst
  93. GRB 051022: SSO40 Optical Observations
  94. GRB051022,optical observation
  95. GRB 051022: Optical observations
  96. GRB 051021,optical observation
  97. GRB051021B: Swift XRT Position
  98. GRB 051021B: Swift detection of a burst
  99. GRB051021: Swift XRT analysis
  100. GRB051021 (=H3947): Refined Analysis

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