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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

16029 results found.

  1. GRB020321 optical observations
  2. GRB 020317 : KISO Optical Observations
  3. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  4. GRB 020305: Optical Observations
  5. GRB020317, optical observations
  6. GRB 020317: Optical observations
  7. GRB020305: Properties of the Candidate Optical Afterglow
  8. GRB 011121: HST Observations reveal an intermediate-time multicolor
  9. GRB020305: Subaru Optical Observations
  10. GRB 020305: Optical observations
  11. XRF/GRB 011030: Detection of the Probable Host Galaxy
  12. GRB 020305: Candidate optical afterglow
  13. Type Ic SN2002bl (SN/GRB?) Radio Observations
  14. GRB020305, optical observations
  15. GRB020305: Optical Observations
  16. IPN triangulation of GRB020305 (HETE 1939)
  17. GRB020305 (=H1939): Localization of a GRB by HETE
  18. GRB 020305: Optical observations
  19. HST Imaging of the afterglow and host of GRB 011121
  20. GRB020124 BVRI field photometry
  21. GRB020127: Palomar and VLA Observations of Possible Counterparts
  22. SN2002ap (SN/GRB?) optical spectrographic observations
  23. GRB020127 Optical Observations
  24. Type Ib/c SN2002ap (SN/GRB?)
  25. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  26. GRB020124, optical observations
  27. GRB020127: Optical observations
  28. IPN triangulation of GRB020127 (=H1902)
  29. GRB020127 Optical Observations -- Erratum to GCN 1230
  30. GRB010921 Optical Observations
  31. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  32. GRB020124: Optical observations
  33. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  34. GRB020124: Optical observations
  35. GRB 020124: Optical observations
  36. GRB 020124 Optical Observations
  37. IPN triangulation of GRB020124 (HETE 1896)
  38. GRB 020124: Optical afterglow
  39. GRB020124(=H1896): Localization of a Long GRB by HETE
  40. HETE 1896: Optical observations
  41. GRB optical counterpart candidate in GCN 1217 is M dwarf
  42. Possible optical counterpart to a GRB
  43. GRB011212, Optical Observations
  44. Optical polarization observations for GRB011211
  45. Color indices of the afterglow of GRB011211
  46. GRB011212: Optical observations at Gunma
  47. GRB 011211, spectrum and optical photometry
  48. GRB 011130: Optical Observations of X-ray and Radio Sources
  49. GRB011212: Optical observations
  50. GRB 011212: optical observation at Asiago
  51. GRB 011211: Evidence for an Optical Break
  52. optical follow-up of GRB(XRF) 011211
  53. GRB 011212: optical observation at Oslo (relayed)
  54. GRB 011211: Optical Spectroscopy
  55. GRB 011211, Optical Observations
  56. GRB011212, BVRI field photometry
  57. GRB011211, BVRI field photometry
  58. GRB011212: Optical observations
  59. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  60. Fading of the optical source associated of XRF 011211
  61. GRB 011211 Optical Observations: Likely Afterglow
  62. GRB 011130: Optical Observations of Chandra Sources
  63. GRB 011130: Optical Observations of Chandra sources
  64. GRB 011130: Magellan spectroscopy
  65. GRB011130, optical observations
  66. GRB 011130, K band observations
  67. GRB011130, optical observations
  68. GRB011130 (=XRF011130): Second Revised Localization by HETE
  69. GRB 011130 I-band Observation
  70. GRB011130 (XRF011130) optical observations
  71. XRF011130: Infrared Observations
  72. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  73. GRB011130 (=XRF011130), Optical Observations
  74. XRF011130: NEAT Optical Observations
  75. GRB011130 (=XRF011130): Revised Localization of an X-ray
  76. GRB001109, Radio Monitoring
  77. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  78. GRB 011121: J-band observations
  79. GRB 011121: HST Scheduled
  80. GRB011121: UBRI Observations
  81. GRB 011121: Radio Observations
  82. GRB 011121 J-Band Astrometry
  83. GRB011121: fading behavior
  84. GRB011121: possible optical counterpart
  85. GRB011030, optical observation
  86. GRB 011030 I-band Observation
  87. The X-ray Flash 011030 ('GRB 011030')
  88. Non-triggered burst 011030 ("GRB 011030")
  89. GRB 010921: HST Detection of the Afterglow and Host Galaxy
  90. GRB 970828: HST Observations of the Host Galaxy
  91. GRB 000131: HST Detection of the Host Galaxy
  92. GRB 970828: HST Observations of the Host Galaxy
  93. GRB010921, optical observation
  94. GRB 011019 optical observation
  95. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  96. GRB011019: Subaru Optical Observations
  97. GRB010921, optical observations
  98. GRB 011030, R-band observations
  99. GRB 010921: Possible supernova component
  100. GRB011019: NEAT Optical Observations

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