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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"

27886 results found.

  1. GRB 051210: Swift XRT refined analysis
  2. GRB 051210: FRAM early limit
  3. GRB 051210: Swift-BAT refined analysis of a short burst
  4. GRB051210: Swift UVOT Observation
  5. GRB 051210: Swift detection of a burst
  6. An extraordinary long burst on December 3 from SGR1806-20
  7. Possible resuming of the SGR 1806-20 activity
  8. GRB051117B: Swift XRT refined analysis
  9. GRB051117b: No Swift/UVOT Detection
  10. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  11. GRB 051117A: Swift/UVOT Detection of an Afterglow
  12. GRB051111: Suzaku WAM observation of the prompt emission
  13. GRB051008: Suzaku WAM observation of the prompt emission
  14. GRB 051117B: R and I observations of possible host galaxy
  15. GRB 051117A: Refined analysis of the Swift-BAT burst
  16. GRB 051117B: Refined analysis of the Swift-BAT burst
  17. GRB 051117B,optical observation
  18. GRB 051117B: Lulin R and I band observation
  19. GRB051114: results of the Swift-XRT observation
  20. GRB 051109B : Nainital upper limits
  21. GRB 051114: Radio Observations
  22. GRB 051114: Swift-BAT refined analysis
  23. GRB050925: analysis of the XMM-Newton observation
  24. GRB 051114: Swift-BAT detection of a short burst
  25. GRB 051111: Further spectroscopic analysis
  26. GRB 051111: Radio afterglow
  27. GRB 051113: Swift-BAT refined analysis
  28. GRB051103: Radio Observations
  29. GRB/SGR 050925: XMM-Newton ToO observation
  30. GRB051111: Swift/UVOT Observations
  31. GRB051111: XRT preliminary analysis
  32. GRB 051111: Swift-BAT refined analysis
  33. GRB 051109A Optical Observations
  34. GRB 051111A : Lulin BVRI multi band afterglow observation
  35. GRB051111a: SARA Observations
  36. GRB 051111a: IR photometry
  37. GRB 051109B. Radio Observations
  38. GRB 051109A
  39. GRB051109A - radio observations
  40. GRB 051109B: Swift-BAT refined analysis
  41. GRB 051109A: Swift-UVOT Observations
  42. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  43. GRB051109B: no UVOT source detected
  44. GRB051109B: XRT refined analysis
  45. GRB 051109B : Lulin Optical Observations
  46. GRB 051109A : Lulin BVRI Optical afterglow observation
  47. GRB051109A: further steepening in the X-ray light curve
  48. GRB051109A: XRT refined analysis
  49. GRB 051109B: Super-LOTIS Observations
  50. GRB051105B: REM Optical observation
  51. GRB 051109B: Swift detection of a burst
  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. GRB051103: MASTER: OT limit and host galaxy candidates
  60. GRB051028: Swift-XRT refined analysis
  61. GRB 051105a, observation from Naini Tal and OSN
  62. GRB 051105a: MDM Observations
  63. GRB 051105A: TNG optical observations
  64. GRB051105A: Swift/UVOT Observations
  65. GRB 051105A, radio observations
  66. GRB051103:_MASTER_optical_observations
  67. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  68. GRB 051105A, optical observations
  69. XRT observations of GRB 051105A
  70. GRB 051105b: ART optical limits
  71. GRB 051105B (INTEGRAL 2701): Optical observation
  72. GRB 051105: Swift detection of a short burst
  73. Recent GRB UBVRcIc field photometry
  74. GRB051028 SARA Observation
  75. GRB051028: optical observations
  76. GRB051028: Swift/UVOT upper limits
  77. GRB051028: Swift XRT Position
  78. GRB051028:MASTER observations
  79. GRB051021B: Swift/UVOT Upper limits
  80. GRB 051021, Optical Observations
  81. GRB 051022: XRT Refined Spectral and Temporal Analysis
  82. GRB051012: Swift-XRT analysis
  83. GRB051021B: Swift XRT refined analysis
  84. GRB 051022, mm counterpart
  85. GRB 051022: Swift/UVOT Upper Limits
  86. GRB051022: Radio Counterpart
  87. GRB051022: IR observations
  88. GRB051021A: Swift XRT refined analysis
  89. GRB051022: Optical Observations
  90. GRB051021b: Magellan IR Imaging
  91. GRB 051021, SMARTS optical/IR observations
  92. GRB051022: Swift XRT Position
  93. GRB 051021: P200 Ks Observations
  94. GRB 051022 (=H3950): SXC Flight Localization is Valid
  95. GRB051021: Swift/UVOT Upper Limits
  96. GRB 051021B: Refined analysis of the Swift-BAT burst
  97. GRB 051022: SSO40 Optical Observations
  98. GRB051022,optical observation
  99. GRB 051021,optical observation
  100. GRB 051021B: Swift detection of a burst

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