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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"

45520 results found.

  1. Type Ib/c SN2002ap (SN/GRB?)
  2. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  3. GRB020124, optical observations
  4. GRB020127: Optical observations
  5. GRB 020127, I-band observations starting 3.14-hr after the event
  6. IPN detection of further activity from SGR1806-20
  7. IPN triangulation of GRB020127 (=H1902)
  8. GRB020127 Optical Observations -- Erratum to GCN 1230
  9. GRB010921 Optical Observations
  10. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  11. GRB020124: Optical observations
  12. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  13. GRB020124: Optical observations
  14. GRB 020124: Optical observations
  15. GRB 020124 Optical Observations
  16. IPN triangulation of GRB020124 (HETE 1896)
  17. IPN observations of SGR1806-20
  18. GRB 020124: Optical afterglow
  19. GRB020124(=H1896): Localization of a Long GRB by HETE
  20. HETE 1896: Optical observations
  21. GRB optical counterpart candidate in GCN 1217 is M dwarf
  22. Possible optical counterpart to a GRB
  23. GRB011212, Optical Observations
  24. GRB011211: BeppoSAX/GRBM data
  25. Optical polarization observations for GRB011211
  26. GRB 011211: Detection of the Probable Host Galaxy
  27. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  28. Color indices of the afterglow of GRB011211
  29. GRB011212: Optical observations at Gunma
  30. GRB 011211, spectrum and optical photometry
  31. GRB 011130: Optical Observations of X-ray and Radio Sources
  32. GRB 011130, Radio/X-ray Comparison
  33. GRB011212: Optical observations
  34. GRB 011212: optical observation at Asiago
  35. GRB 011211: Evidence for an Optical Break
  36. GRB 011211: TNG Spectroscopic Observations
  37. optical follow-up of GRB(XRF) 011211
  38. GRB 011212: optical observation at Oslo (relayed)
  39. GRB 011211: Optical Spectroscopy
  40. GRB 011211, Optical Observations
  41. GRB011212, BVRI field photometry
  42. GRB011211, BVRI field photometry
  43. GRB011212: Optical observations
  44. GRB 011211: BVRi-band photometry
  45. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  46. Fading of the optical source associated of XRF 011211
  47. XMM-Newton observation of GRB011211
  48. GRB 011211 Optical Observations: Likely Afterglow
  49. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  50. GRB011211(=XRF011211): BeppoSAX refined positions
  51. BeppoSAX Alert: GRB011211(=XRF011211)
  52. GRB 011130: Optical Observations of Chandra Sources
  53. GRB 011130: Optical Observations of Chandra sources
  54. GRB011130 (XRF011130) Chandra Observations
  55. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  56. GRB 011130: Magellan spectroscopy
  57. Sub-mm and Centimeter Detections of the Host Galaxy of GRB000418
  58. GRB011130, optical observations
  59. GRB 011130, K band observations
  60. GRB011130, optical observations
  61. GRB011130 (=XRF011130): Second Revised Localization by HETE
  62. GRB 011130 I-band Observation
  63. GRB011130 (XRF011130) optical observations
  64. GRB011130 (XRF011130) SDSS PT i-band observations
  65. XRF011130: Infrared Observations
  66. GRB011130, Radio Observations
  67. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  68. GRB011130 (=XRF011130), Optical Observations
  69. XRF011130: NEAT Optical Observations
  70. GRB011130 (=XRF011130): Revised Localization of an X-ray
  71. GRB001109, Radio Monitoring
  72. GRB 011121
  73. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  74. GRB 011121: J-band observations
  75. GRB 011121: NIR observations, host galaxy?
  76. GRB010921 - Milagro GeV/TeV Observations
  77. GRB 011121: HST Scheduled
  78. GRB011121: fainter still
  79. Correction: GCN1157 (GRB 011121)
  80. GRB011121: UBRI Observations
  81. GRB011121
  82. GRB 011121: Radio Observations
  83. GRB 011121 J-Band Astrometry
  84. GRB011121: continued decay
  85. GRB 011121: Detection of Bright IR Counterpart
  86. GRB011121: possible redshift, continued decay
  87. GRB011121: fading behavior
  88. GRB011121: possible optical counterpart
  89. IPN triangulation of GRB011121
  90. BEPPOSAX GRB011121
  91. GRB 011030: TNG K-band observation
  92. XRF011030: J and K band observations
  93. GRB011030, optical observation
  94. XRF011030: Chandra Observations
  95. GRB 011030: K-band observations
  96. GRB011030: Z-band observations
  97. GRB 011030 R band observations
  98. GRB 011030 I-band Observation
  99. The X-ray Flash 011030 ('GRB 011030')
  100. Non-triggered burst 011030 ("GRB 011030")

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