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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"

26364 results found.

  1. GRB050925: analysis of the XMM-Newton observation
  2. GRB 051114: Swift-BAT detection of a short burst
  3. GRB 051111: Further spectroscopic analysis
  4. GRB 051111: Radio afterglow
  5. GRB 051113: Swift-BAT refined analysis
  6. GRB051103: Radio Observations
  7. GRB/SGR 050925: XMM-Newton ToO observation
  8. GRB051111: Swift/UVOT Observations
  9. GRB051111: XRT preliminary analysis
  10. GRB 051111: Swift-BAT refined analysis
  11. GRB 051109A Optical Observations
  12. GRB 051111A : Lulin BVRI multi band afterglow observation
  13. GRB051111a: SARA Observations
  14. GRB 051111a: IR photometry
  15. GRB 051109B. Radio Observations
  16. GRB 051109A
  17. GRB051109A - radio observations
  18. GRB 051109B: Swift-BAT refined analysis
  19. GRB 051109A: Swift-UVOT Observations
  20. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  21. GRB051109B: no UVOT source detected
  22. GRB051109B: XRT refined analysis
  23. GRB 051109B : Lulin Optical Observations
  24. GRB 051109A : Lulin BVRI Optical afterglow observation
  25. GRB051109A: further steepening in the X-ray light curve
  26. GRB051109A: XRT refined analysis
  27. GRB 051109B: Super-LOTIS Observations
  28. GRB051105B: REM Optical observation
  29. GRB 051109B: Swift detection of a burst
  30. GRB 051109: Rc and Ic observations
  31. GRB 051109: Swift-BAT refined analysis
  32. GRB 051109a: IR Photometry and Astrometry
  33. GRB051109: Swift detection of a burst
  34. GRB 051109a: IR Detections
  35. GRB051105B: Swift/XRT upper limit
  36. GRB051105B: Swift/UVOT upper limit
  37. GRB051103: MASTER: OT limit and host galaxy candidates
  38. GRB051028: Swift-XRT refined analysis
  39. GRB 051105a, observation from Naini Tal and OSN
  40. GRB 051105a: MDM Observations
  41. GRB 051105A: TNG optical observations
  42. GRB051105A: Swift/UVOT Observations
  43. GRB 051105A, radio observations
  44. GRB051103:_MASTER_optical_observations
  45. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  46. GRB 051105A, optical observations
  47. XRT observations of GRB 051105A
  48. GRB 051105b: ART optical limits
  49. GRB 051105B (INTEGRAL 2701): Optical observation
  50. GRB 051105: Swift detection of a short burst
  51. Recent GRB UBVRcIc field photometry
  52. GRB051028 SARA Observation
  53. GRB051028: optical observations
  54. GRB051028: Swift/UVOT upper limits
  55. GRB051028: Swift XRT Position
  56. GRB051028:MASTER observations
  57. GRB051021B: Swift/UVOT Upper limits
  58. GRB 051021, Optical Observations
  59. GRB 051022: XRT Refined Spectral and Temporal Analysis
  60. GRB051012: Swift-XRT analysis
  61. GRB051021B: Swift XRT refined analysis
  62. GRB 051022, mm counterpart
  63. GRB 051022: Swift/UVOT Upper Limits
  64. GRB051022: Radio Counterpart
  65. GRB051022: IR observations
  66. GRB051021A: Swift XRT refined analysis
  67. GRB051022: Optical Observations
  68. GRB051021b: Magellan IR Imaging
  69. GRB 051021, SMARTS optical/IR observations
  70. GRB051022: Swift XRT Position
  71. GRB 051021: P200 Ks Observations
  72. GRB 051022 (=H3950): SXC Flight Localization is Valid
  73. GRB051021: Swift/UVOT Upper Limits
  74. GRB 051021B: Refined analysis of the Swift-BAT burst
  75. GRB 051022: SSO40 Optical Observations
  76. GRB051022,optical observation
  77. GRB 051021,optical observation
  78. GRB 051021B: Swift detection of a burst
  79. GRB 051021 : optical afterglow observation at Lulin
  80. GRB 051021: Optical observations and candidate afterglow
  81. GRB051021.63
  82. GRB051021.6: MASTER optical observation
  83. GRB051021: A GRB Localized by HETE
  84. Swift-BAT triggered on a posible CR Shower or possible GRB
  85. GRB 051016b: Optical limit
  86. Afterglow candidate of GRB 051016B observed at Lulin
  87. GRB 051016A: Swift/UVOT upper limits
  88. GRB 051016B: refined analysis of the Swift/XRT data
  89. GRB 051016B: Swift/UVOT detection
  90. GRB 051016B,optical observation
  91. GRB 051016B : Optical follow-up at Lulin
  92. GRB 051016B: Refined analysis of the Swift-BAT burst
  93. GRB 051016B: Swift detection of a soft burst
  94. GRB 051016: Swift-BAT refined analysis
  95. GRB051016 XMM-Newton observation
  96. GRB051016: Swift XRT refined analysis.
  97. GRB 051016: PROMPT Observations
  98. GRB051016: Swift detection of a burst
  99. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  100. GRB 051012: Swift-BAT detection of burst yesterday

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