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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"

31730 results found.

  1. GRB 051111: Radio afterglow
  2. GRB 051113: Swift-BAT refined analysis
  3. GRB051103: Radio Observations
  4. GRB 051109A Milagro GeV/TeV Observations
  5. GRB/SGR 050925: XMM-Newton ToO observation
  6. GRB051111: Swift/UVOT Observations
  7. GRB 051111A : R-band temporal decay index based on Lulin
  8. GRB051111: XRT preliminary analysis
  9. GRB 051111: Swift-BAT refined analysis
  10. GRB 051109A Optical Observations
  11. GRB051111a: SARA Observations
  12. GRB 051111a: IR photometry
  13. GRB 051111A: KAIT optical observations
  14. GRB 051111a: Afterglow fading in Ic
  15. GRB051111: Super-LOTIS Early Detection
  16. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  17. GRB 051103 Milagro GeV/TeV Observations
  18. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  19. GRB 051008 Tautenburg Supernova Search
  20. GRB 051109B. Radio Observations
  21. GRB 051109A
  22. GRB051109A - radio observations
  23. GRB 051105a: GETS optical limit
  24. GRB 051109b: GETS observation
  25. GRB 051109A: KAIT optical observations
  26. Early RAPTOR measurements of GRB 051109a - the movie.
  27. Konus-Wind observation of GRB 051109A
  28. GRB 051109B: Swift-BAT refined analysis
  29. GRB 051109B: ROTSE-III Optical Limits
  30. GRB 051109A: Swift-UVOT Observations
  31. GRB051109B: no UVOT source detected
  32. GRB051109B: XRT refined analysis
  33. GRB 051109B : Lulin Optical Observations
  34. GRB051109A: further steepening in the X-ray light curve
  35. GRB051109A: XRT refined analysis
  36. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  37. GRB051109B: XRT position
  38. GRB 051109B Kiso optical follow-up observation
  39. GRB 051109: HET Optical Spectrum and Absorption Redshift
  40. GRB 051109: PROMPT Detections
  41. GRB 051109: Rc and Ic observations
  42. GRB051109: Early Super-LOTIS Detection
  43. GRB 051109: Swift-BAT refined analysis
  44. GRB 051109a: MDM Observations
  45. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  46. GRB051109: Swift detection of a burst
  47. GRB 051109a: IR Detections
  48. GRB 051109: ROTSE-III Detection of Possible Counterpart
  49. GRB051105B: Swift/XRT upper limit
  50. GRB051105B: Swift/UVOT upper limit
  51. GRB051103: optical observations
  52. GRB 051103, optical observations
  53. GRB051103: MASTER: OT limit and host galaxy candidates
  54. GRB051028: Swift-XRT refined analysis
  55. GRB 051105a, observation from Naini Tal and OSN
  56. GRB 051105A, 2nd epoch optical observations
  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. GRB 051105A, optical observations
  63. XRT observations of GRB 051105A
  64. GRB 051105: Swift-BAT improved refined analysis
  65. GRB 051105: Swift-BAT refined analysis
  66. GRB 051105: Optical limit
  67. GRB 051016B host spectroscopy and redshift
  68. GRB051016B: optical observation
  69. Konus-Wind observation of GRB 051028
  70. GRB051028:MASTER correction and final results
  71. GRB 051022: RTT150 optical observations
  72. GRB 051021A: RTT150 optical observations
  73. GRB051028 SARA Observation
  74. GRB051028: optical observations
  75. GRB051028: Swift/UVOT upper limits
  76. GRB051028: WHT optical candidate
  77. GRB051028: Swift XRT Position
  78. GRB051028:MASTER observations
  79. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  80. GRB051022: Swift XRT measurement of jet break
  81. GRB051021B: Swift/UVOT Upper limits
  82. GRB 051022: XRT Refined Spectral and Temporal Analysis
  83. GRB 051022, refined optical astrometry
  84. Chandra Observations of GRB 051022
  85. GRB051012: Swift-XRT analysis
  86. GRB051021B: Swift XRT refined analysis
  87. GRB051021a: optical observations
  88. GRB 051022: WSRT Radio Detection
  89. GRB 051022, mm counterpart
  90. GRB051022: host galaxy redshift
  91. GRB 051022: Swift/UVOT Upper Limits
  92. GRB051022: Radio Counterpart
  93. GRB051022: IR observations
  94. GRB 051022: SOAR JKs Observations
  95. GRB051021A: Swift XRT refined analysis
  96. Konus-Wind observation of GRB 051022
  97. GRB051022: Optical Observations
  98. GRB 051022: Magellan NIR imaging
  99. GRB 051021: PROMPT RcIc Observations
  100. GRB051021b: Magellan IR Imaging

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