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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"

35254 results found.

  1. GRB051103: Radio Observations
  2. GRB 051109A Milagro GeV/TeV Observations
  3. GRB/SGR 050925: XMM-Newton ToO observation
  4. GRB051111: Swift/UVOT Observations
  5. GRB 051111A : R-band temporal decay index based on Lulin
  6. GRB 051111: Swift-BAT refined analysis
  7. GRB 051109A Optical Observations
  8. GRB 051111A : Lulin BVRI multi band afterglow observation
  9. GRB051111a: SARA Observations
  10. GRB 051111a: IR photometry
  11. GRB 051111: Keck HIRES redshift
  12. GRB 051111A: KAIT optical observations
  13. GRB 051111a: Afterglow fading in Ic
  14. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  15. GRB 051103 Milagro GeV/TeV Observations
  16. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  17. GRB 051008 Tautenburg Supernova Search
  18. GRB 051109B. Radio Observations
  19. GRB 051109A
  20. GRB051109A - radio observations
  21. GRB 051105a: GETS optical limit
  22. GRB 051109b: GETS observation
  23. GRB 051109A: KAIT optical observations
  24. Early RAPTOR measurements of GRB 051109a - the movie.
  25. Konus-Wind observation of GRB 051109A
  26. GRB 051109B: Swift-BAT refined analysis
  27. GRB 051109B: ROTSE-III Optical Limits
  28. GRB 051109A: Swift-UVOT Observations
  29. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  30. GRB 051109B : Lulin Optical Observations
  31. GRB 051109A : Lulin BVRI Optical afterglow observation
  32. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  33. GRB051109B: XRT position
  34. GRB 051109B: Super-LOTIS Observations
  35. GRB 051109B Kiso optical follow-up observation
  36. GRB 051109B: Swift detection of a burst
  37. GRB 051109: HET Optical Spectrum and Absorption Redshift
  38. GRB 051109: PROMPT Detections
  39. GRB 051109: Rc and Ic observations
  40. GRB 051109: Swift-BAT refined analysis
  41. GRB 051109a: IR Photometry and Astrometry
  42. GRB 051109a: MDM Observations
  43. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  44. GRB 051109a: IR Detections
  45. GRB 051109: ROTSE-III Detection of Possible Counterpart
  46. GRB051105B: Swift/XRT upper limit
  47. GRB051105B: Swift/UVOT upper limit
  48. GRB051103: optical observations
  49. GRB 051103, optical observations
  50. GRB051103: MASTER: OT limit and host galaxy candidates
  51. GRB 051105a, observation from Naini Tal and OSN
  52. GRB 051105A, 2nd epoch optical observations
  53. GRB 051105a: MDM Observations
  54. GRB 051105A: TNG optical observations
  55. GRB051105A: Swift/UVOT Observations
  56. GRB 051105A, radio observations
  57. GRB051103:_MASTER_optical_observations
  58. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  59. GRB 051105A, optical observations
  60. XRT observations of GRB 051105A
  61. GRB 051105: Swift-BAT improved refined analysis
  62. GRB 051105b: ART optical limits
  63. GRB051105B - A long GRB detected by INTEGRAL
  64. GRB 051105B (INTEGRAL 2701): Optical observation
  65. GRB 051105: Swift-BAT refined analysis
  66. GRB 051105: Optical limit
  67. GRB 051105: Swift detection of a short burst
  68. IBAS Alert 2700: Not a GRB
  69. GRB 051016B host spectroscopy and redshift
  70. GRB051016B: optical observation
  71. Recent GRB UBVRcIc field photometry
  72. Konus-Wind observation of GRB 051028
  73. GRB051028:MASTER correction and final results
  74. GRB 051022: RTT150 optical observations
  75. GRB 051021A: RTT150 optical observations
  76. GRB051028 SARA Observation
  77. GRB051028: optical observations
  78. GRB051028: Swift/UVOT upper limits
  79. GRB051028: confirmation of the afterglow
  80. GRB051028: WHT optical candidate
  81. GRB051028: Swift XRT Position
  82. GRB051028:MASTER observations
  83. GRB 051028 (=H3951): A GRB localized by HETE
  84. GRB051028:MASTER optical observations
  85. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  86. GRB051022: Swift XRT measurement of jet break
  87. GRB051021B: Swift/UVOT Upper limits
  88. GRB 051021, Optical Observations
  89. GRB 051022: XRT Refined Spectral and Temporal Analysis
  90. GRB 051022, refined optical astrometry
  91. Chandra Observations of GRB 051022
  92. GRB 051022 Chandra Observations scheduled
  93. GRB051021a: optical observations
  94. GRB 051022: WSRT Radio Detection
  95. GRB 051022, mm counterpart
  96. GRB051022: host galaxy redshift
  97. GRB 051022: Swift/UVOT Upper Limits
  98. GRB051022: Radio Counterpart
  99. GRB 051022: SOAR JKs Observations
  100. Konus-Wind observation of GRB 051022

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