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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"

35953 results found.

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

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