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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"

45493 results found.

  1. Color indices of the afterglow of GRB011211
  2. GRB011212: Optical observations at Gunma
  3. GRB 011211, spectrum and optical photometry
  4. GRB 011130: Optical Observations of X-ray and Radio Sources
  5. GRB 011130, Radio/X-ray Comparison
  6. GRB011212: Optical observations
  7. GRB 011212: optical observation at Asiago
  8. GRB 011211: Evidence for an Optical Break
  9. GRB 011211: TNG Spectroscopic Observations
  10. optical follow-up of GRB(XRF) 011211
  11. GRB 011212: optical observation at Oslo (relayed)
  12. GRB 011211: Optical Spectroscopy
  13. GRB 011211, Optical Observations
  14. GRB011212, BVRI field photometry
  15. GRB011211, BVRI field photometry
  16. GRB011212: Optical observations
  17. GRB 011211: BVRi-band photometry
  18. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  19. Fading of the optical source associated of XRF 011211
  20. XMM-Newton observation of GRB011211
  21. GRB 011211 Optical Observations: Likely Afterglow
  22. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  23. GRB011211(=XRF011211): BeppoSAX refined positions
  24. BeppoSAX Alert: GRB011211(=XRF011211)
  25. GRB 011130: Optical Observations of Chandra Sources
  26. GRB 011130: Optical Observations of Chandra sources
  27. GRB011130 (XRF011130) Chandra Observations
  28. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  29. GRB 011130: Magellan spectroscopy
  30. Sub-mm and Centimeter Detections of the Host Galaxy of GRB000418
  31. GRB011130, optical observations
  32. GRB 011130, K band observations
  33. GRB011130, optical observations
  34. GRB011130 (=XRF011130): Second Revised Localization by HETE
  35. GRB 011130 I-band Observation
  36. GRB011130 (XRF011130) optical observations
  37. GRB011130 (XRF011130) SDSS PT i-band observations
  38. XRF011130: Infrared Observations
  39. GRB011130, Radio Observations
  40. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  41. GRB011130 (=XRF011130), Optical Observations
  42. XRF011130: NEAT Optical Observations
  43. GRB011130 (=XRF011130): Revised Localization of an X-ray
  44. GRB001109, Radio Monitoring
  45. GRB 011121
  46. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  47. GRB 011121: J-band observations
  48. GRB 011121: NIR observations, host galaxy?
  49. GRB010921 - Milagro GeV/TeV Observations
  50. GRB 011121: HST Scheduled
  51. GRB011121: fainter still
  52. Correction: GCN1157 (GRB 011121)
  53. GRB011121: UBRI Observations
  54. GRB011121
  55. GRB 011121: Radio Observations
  56. GRB 011121 J-Band Astrometry
  57. GRB011121: continued decay
  58. GRB 011121: Detection of Bright IR Counterpart
  59. GRB011121: possible redshift, continued decay
  60. GRB011121: fading behavior
  61. GRB011121: possible optical counterpart
  62. IPN triangulation of GRB011121
  63. BEPPOSAX GRB011121
  64. GRB 011030: TNG K-band observation
  65. XRF011030: J and K band observations
  66. GRB011030, optical observation
  67. XRF011030: Chandra Observations
  68. GRB 011030: K-band observations
  69. GRB011030: Z-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. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  82. GRB011019: Subaru Optical Observations
  83. GRB 011030 I-band Observations
  84. GRB 011030 K-band Observations
  85. GRB010921, optical observations
  86. GRB 011030, WSRT radio observations
  87. GRB011030 - further refinement WFC position
  88. GRB 011030, Radio observations
  89. GRB011030: radio search
  90. GRB 011030, R-band observations
  91. X-ray rich GRB011030: BeppoSAX refined positions
  92. BeppoSAX ALERT: Possible X-ray rich GRB011030
  93. GRB 010921: Possible supernova component
  94. GRB011019: NEAT Optical Observations
  95. GRB011019: ROTSE-III optical observations
  96. GRB010921, optical observation at early time
  97. GRB 010921, I-band observations
  98. GRB011019: Optical observations
  99. GRB011019, optical observations
  100. GRB011019: A Faint, X-ray Rich GRB localized by HETE

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