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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"

28082 results found.

  1. GRB 051210: Swift detection of a burst
  2. An extraordinary long burst on December 3 from SGR1806-20
  3. Possible resuming of the SGR 1806-20 activity
  4. GRB051117B: Swift XRT refined analysis
  5. GRB051117b: No Swift/UVOT Detection
  6. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  7. GRB 051117A: Swift/UVOT Detection of an Afterglow
  8. GRB051111: Suzaku WAM observation of the prompt emission
  9. GRB051008: Suzaku WAM observation of the prompt emission
  10. GRB 051117B: R and I observations of possible host galaxy
  11. GRB 051117A: Refined analysis of the Swift-BAT burst
  12. GRB 051117B: Refined analysis of the Swift-BAT burst
  13. GRB 051117B,optical observation
  14. GRB 051117B: Lulin R and I band observation
  15. GRB051114: results of the Swift-XRT observation
  16. GRB 051109B : Nainital upper limits
  17. GRB 051114: Radio Observations
  18. GRB 051114: Swift-BAT refined analysis
  19. GRB050925: analysis of the XMM-Newton observation
  20. GRB 051114: Swift-BAT detection of a short burst
  21. GRB 051111: Further spectroscopic analysis
  22. GRB 051111: Radio afterglow
  23. GRB 051113: Swift-BAT refined analysis
  24. GRB051103: Radio Observations
  25. GRB/SGR 050925: XMM-Newton ToO observation
  26. GRB051111: Swift/UVOT Observations
  27. GRB051111: XRT preliminary analysis
  28. GRB 051111: Swift-BAT refined analysis
  29. GRB 051109A Optical Observations
  30. GRB 051111A : Lulin BVRI multi band afterglow observation
  31. GRB051111a: SARA Observations
  32. GRB 051111a: IR photometry
  33. GRB 051109B. Radio Observations
  34. GRB 051109A
  35. GRB051109A - radio observations
  36. GRB 051109B: Swift-BAT refined analysis
  37. GRB 051109A: Swift-UVOT Observations
  38. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  39. GRB051109B: no UVOT source detected
  40. GRB051109B: XRT refined analysis
  41. GRB 051109B : Lulin Optical Observations
  42. GRB 051109A : Lulin BVRI Optical afterglow observation
  43. GRB051109A: further steepening in the X-ray light curve
  44. GRB051109A: XRT refined analysis
  45. GRB 051109B: Super-LOTIS Observations
  46. GRB051105B: REM Optical observation
  47. GRB 051109B: Swift detection of a burst
  48. GRB 051109: Rc and Ic observations
  49. GRB 051109: Swift-BAT refined analysis
  50. GRB 051109a: IR Photometry and Astrometry
  51. GRB051109: Swift detection of a burst
  52. GRB 051109a: IR Detections
  53. GRB051105B: Swift/XRT upper limit
  54. GRB051105B: Swift/UVOT upper limit
  55. GRB051103: MASTER: OT limit and host galaxy candidates
  56. GRB051028: Swift-XRT refined analysis
  57. GRB 051105a, observation from Naini Tal and OSN
  58. GRB 051105a: MDM Observations
  59. GRB 051105A: TNG optical observations
  60. GRB051105A: Swift/UVOT Observations
  61. GRB 051105A, radio observations
  62. GRB051103:_MASTER_optical_observations
  63. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  64. GRB 051105A, optical observations
  65. XRT observations of GRB 051105A
  66. GRB 051105b: ART optical limits
  67. GRB 051105B (INTEGRAL 2701): Optical observation
  68. GRB 051105: Swift detection of a short burst
  69. Recent GRB UBVRcIc field photometry
  70. GRB051028 SARA Observation
  71. GRB051028: optical observations
  72. GRB051028: Swift/UVOT upper limits
  73. GRB051028: Swift XRT Position
  74. GRB051028:MASTER observations
  75. GRB051021B: Swift/UVOT Upper limits
  76. GRB 051021, Optical Observations
  77. GRB 051022: XRT Refined Spectral and Temporal Analysis
  78. GRB051012: Swift-XRT analysis
  79. GRB051021B: Swift XRT refined analysis
  80. GRB 051022, mm counterpart
  81. GRB 051022: Swift/UVOT Upper Limits
  82. GRB051022: Radio Counterpart
  83. GRB051022: IR observations
  84. GRB051021A: Swift XRT refined analysis
  85. GRB051022: Optical Observations
  86. GRB051021b: Magellan IR Imaging
  87. GRB 051021, SMARTS optical/IR observations
  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 051021,optical observation
  96. GRB 051021B: Swift detection of a burst
  97. GRB 051021 : optical afterglow observation at Lulin
  98. GRB 051021: Optical observations and candidate afterglow
  99. GRB051021.63
  100. GRB051021.6: MASTER optical observation

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