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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"

28081 results found.

  1. An extraordinary long burst on December 3 from SGR1806-20
  2. Possible resuming of the SGR 1806-20 activity
  3. GRB051117B: Swift XRT refined analysis
  4. GRB051117b: No Swift/UVOT Detection
  5. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  6. GRB 051117A: Swift/UVOT Detection of an Afterglow
  7. GRB051111: Suzaku WAM observation of the prompt emission
  8. GRB051008: Suzaku WAM observation of the prompt emission
  9. GRB 051117B: R and I observations of possible host galaxy
  10. GRB 051117A: Refined analysis of the Swift-BAT burst
  11. GRB 051117B: Refined analysis of the Swift-BAT burst
  12. GRB 051117B,optical observation
  13. GRB 051117B: Lulin R and I band observation
  14. GRB051114: results of the Swift-XRT observation
  15. GRB 051109B : Nainital upper limits
  16. GRB 051114: Radio Observations
  17. GRB 051114: Swift-BAT refined analysis
  18. GRB050925: analysis of the XMM-Newton observation
  19. GRB 051114: Swift-BAT detection of a short burst
  20. GRB 051111: Further spectroscopic analysis
  21. GRB 051111: Radio afterglow
  22. GRB 051113: Swift-BAT refined analysis
  23. GRB051103: Radio Observations
  24. GRB/SGR 050925: XMM-Newton ToO observation
  25. GRB051111: Swift/UVOT Observations
  26. GRB051111: XRT preliminary analysis
  27. GRB 051111: Swift-BAT refined analysis
  28. GRB 051109A Optical Observations
  29. GRB 051111A : Lulin BVRI multi band afterglow observation
  30. GRB051111a: SARA Observations
  31. GRB 051111a: IR photometry
  32. GRB 051109B. Radio Observations
  33. GRB 051109A
  34. GRB051109A - radio observations
  35. GRB 051109B: Swift-BAT refined analysis
  36. GRB 051109A: Swift-UVOT Observations
  37. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  38. GRB051109B: no UVOT source detected
  39. GRB051109B: XRT refined analysis
  40. GRB 051109B : Lulin Optical Observations
  41. GRB 051109A : Lulin BVRI Optical afterglow observation
  42. GRB051109A: further steepening in the X-ray light curve
  43. GRB051109A: XRT refined analysis
  44. GRB 051109B: Super-LOTIS Observations
  45. GRB051105B: REM Optical observation
  46. GRB 051109B: Swift detection of a burst
  47. GRB 051109: Rc and Ic observations
  48. GRB 051109: Swift-BAT refined analysis
  49. GRB 051109a: IR Photometry and Astrometry
  50. GRB051109: Swift detection of a burst
  51. GRB 051109a: IR Detections
  52. GRB051105B: Swift/XRT upper limit
  53. GRB051105B: Swift/UVOT upper limit
  54. GRB051103: MASTER: OT limit and host galaxy candidates
  55. GRB051028: Swift-XRT refined analysis
  56. GRB 051105a, observation from Naini Tal and OSN
  57. GRB 051105a: MDM Observations
  58. GRB 051105A: TNG optical observations
  59. GRB051105A: Swift/UVOT Observations
  60. GRB 051105A, radio observations
  61. GRB051103:_MASTER_optical_observations
  62. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  63. GRB 051105A, optical observations
  64. XRT observations of GRB 051105A
  65. GRB 051105b: ART optical limits
  66. GRB 051105B (INTEGRAL 2701): Optical observation
  67. GRB 051105: Swift detection of a short burst
  68. Recent GRB UBVRcIc field photometry
  69. GRB051028 SARA Observation
  70. GRB051028: optical observations
  71. GRB051028: Swift/UVOT upper limits
  72. GRB051028: Swift XRT Position
  73. GRB051028:MASTER observations
  74. GRB051021B: Swift/UVOT Upper limits
  75. GRB 051021, Optical Observations
  76. GRB 051022: XRT Refined Spectral and Temporal Analysis
  77. GRB051012: Swift-XRT analysis
  78. GRB051021B: Swift XRT refined analysis
  79. GRB 051022, mm counterpart
  80. GRB 051022: Swift/UVOT Upper Limits
  81. GRB051022: Radio Counterpart
  82. GRB051022: IR observations
  83. GRB051021A: Swift XRT refined analysis
  84. GRB051022: Optical Observations
  85. GRB051021b: Magellan IR Imaging
  86. GRB 051021, SMARTS optical/IR observations
  87. GRB051022: Swift XRT Position
  88. GRB 051021: P200 Ks Observations
  89. GRB 051022 (=H3950): SXC Flight Localization is Valid
  90. GRB051021: Swift/UVOT Upper Limits
  91. GRB 051021B: Refined analysis of the Swift-BAT burst
  92. GRB 051022: SSO40 Optical Observations
  93. GRB051022,optical observation
  94. GRB 051021,optical observation
  95. GRB 051021B: Swift detection of a burst
  96. GRB 051021 : optical afterglow observation at Lulin
  97. GRB 051021: Optical observations and candidate afterglow
  98. GRB051021.63
  99. GRB051021.6: MASTER optical observation
  100. GRB051021: A GRB Localized by HETE

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