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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"

37562 results found.

  1. GRB 020127, I-band observations starting 3.14-hr after the event
  2. IPN detection of further activity from SGR1806-20
  3. IPN triangulation of GRB020127 (=H1902)
  4. GRB010921 Optical Observations
  5. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  6. GRB020124: Optical observations
  7. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  8. GRB020124: Optical observations
  9. GRB 020124: Optical observations
  10. GRB 020124 Optical Observations
  11. IPN triangulation of GRB020124 (HETE 1896)
  12. IPN observations of SGR1806-20
  13. GRB 020124: Optical afterglow
  14. GRB020124(=H1896): Localization of a Long GRB by HETE
  15. GRB optical counterpart candidate in GCN 1217 is M dwarf
  16. Possible optical counterpart to a GRB
  17. GRB011212, Optical Observations
  18. GRB 011211: Detection of the Probable Host Galaxy
  19. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  20. GRB 011211, spectrum and optical photometry
  21. GRB 011130: Optical Observations of X-ray and Radio Sources
  22. GRB 011130, Radio/X-ray Comparison
  23. GRB 011212: optical observation at Asiago
  24. GRB 011211: Evidence for an Optical Break
  25. GRB 011211: TNG Spectroscopic Observations
  26. optical follow-up of GRB(XRF) 011211
  27. GRB 011212: optical observation at Oslo (relayed)
  28. GRB 011211: Optical Spectroscopy
  29. GRB 011211, Optical Observations
  30. GRB011212, BVRI field photometry
  31. GRB011211, BVRI field photometry
  32. GRB011212: Optical observations
  33. GRB 011211: BVRi-band photometry
  34. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  35. Fading of the optical source associated of XRF 011211
  36. GRB 011211 Optical Observations: Likely Afterglow
  37. BeppoSAX Alert: GRB011211(=XRF011211)
  38. GRB 011130: Optical Observations of Chandra Sources
  39. GRB 011130: Optical Observations of Chandra sources
  40. GRB 011130: Magellan spectroscopy
  41. Sub-mm and Centimeter Detections of the Host Galaxy of GRB000418
  42. GRB011130, optical observations
  43. GRB 011130, K band observations
  44. GRB011130, optical observations
  45. GRB 011130 I-band Observation
  46. GRB011130 (XRF011130) optical observations
  47. GRB011130 (XRF011130) SDSS PT i-band observations
  48. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  49. XRF011130: NEAT Optical Observations
  50. GRB011130 (=XRF011130): Revised Localization of an X-ray
  51. GRB001109, Radio Monitoring
  52. GRB 011121: Errata URL
  53. GRB 011121
  54. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  55. GRB 011121: J-band observations
  56. GRB 011121: NIR observations, host galaxy?
  57. GRB 011121: HST Scheduled
  58. GRB011121: fainter still
  59. Correction: GCN1157 (GRB 011121)
  60. GRB 011121: Radio Observations
  61. GRB 011121 J-Band Astrometry
  62. GRB011121: continued decay
  63. GRB 011121: Detection of Bright IR Counterpart
  64. GRB011121: possible redshift, continued decay
  65. IPN triangulation of GRB011121
  66. BEPPOSAX GRB011121
  67. GRB 011030: TNG K-band observation
  68. XRF011030: Chandra Observations
  69. GRB 011030: K-band observations
  70. GRB 011030 R band observations
  71. GRB 011030 I-band Observation
  72. The X-ray Flash 011030 ('GRB 011030')
  73. Non-triggered burst 011030 ("GRB 011030")
  74. The Radio Afterglow from the X-ray Rich GRB 011030
  75. GRB 010921: HST Detection of the Afterglow and Host Galaxy
  76. GRB 970828: HST Observations of the Host Galaxy
  77. GRB 000131: HST Detection of the Host Galaxy
  78. GRB 970828: HST Observations of the Host Galaxy
  79. GRB010921, optical observation
  80. GRB 011019 optical observation
  81. GRB011019: Subaru Optical Observations
  82. GRB 011030 I-band Observations
  83. GRB 011030 K-band Observations
  84. GRB010921, optical observations
  85. GRB 011030, WSRT radio observations
  86. GRB011030 - further refinement WFC position
  87. GRB 011030, Radio observations
  88. GRB 011030, R-band observations
  89. BeppoSAX ALERT: Possible X-ray rich GRB011030
  90. GRB 010921: Possible supernova component
  91. GRB011019: NEAT Optical Observations
  92. GRB010921, optical observation at early time
  93. GRB 010921, I-band observations
  94. GRB011019: Optical observations
  95. GRB011019, optical observations
  96. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  97. GRB010921: Spectroscopy of the Host Galaxy
  98. GRB 010921: The afterglow of HETE #1761
  99. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  100. Optical Observations of the field of HETE trigger #1793/GRB 011012?

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