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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.

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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').
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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.

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subject:"Swift"
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10919 results found.

  1. GRB 020409: Optical Observations
  2. X-ray afterglow of GRB020321
  3. GRB020331: Confirmation of Afterglow Candidate with Magellan
  4. GRB020405: VLT optical observations and V band decay slope
  5. GRB020331 optical observations with RIMOTS
  6. GRB020124 optical observations with RIBOTS/RIMOTS
  7. GRB 020405: Moderate-resolution spectroscopy
  8. GRB020331: Optical Observations of Afterglow Candidate
  9. GRB020405: VLT optical observations
  10. GRB020405: VLT spectroscopy
  11. V band observations of GRB020405
  12. GRB011212: Optical Observations
  13. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  14. Near-Infrared Observations of GRB020322 at TIRGO
  15. GRB 020322: Optical Sources and Improved Astrometry
  16. GRB 020322: Optical candidate
  17. XMM-Newton observation of GRB020322
  18. GRB 020317 : KISO Optical Observations
  19. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  20. GRB011130 (XRF011130) Second Epoch Chandra Observations
  21. GRB020305: Subaru Optical Observations
  22. IPN triangulation of GRB020305 (HETE 1939)
  23. GRB020305 (=H1939): Localization of a GRB by HETE
  24. IPN/HETE Detection of Bursts from SGR1900+14
  25. IPN Upper Limits to a GRB Associated With SN2002ap
  26. IPN triangulation of GRB020127 (=H1902)
  27. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  28. IPN triangulation of GRB020124 (HETE 1896)
  29. GRB020124(=H1896): Localization of a Long GRB by HETE
  30. GRB011212, Optical Observations
  31. Optical polarization observations for GRB011211
  32. Color indices of the afterglow of GRB011211
  33. GRB011212: Optical observations at Gunma
  34. GRB 011130: Optical Observations of X-ray and Radio Sources
  35. GRB 011211: TNG Spectroscopic Observations
  36. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  37. XMM-Newton observation of GRB011211
  38. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  39. GRB 011130: Optical Observations of Chandra Sources
  40. GRB 011130: Optical Observations of Chandra sources
  41. GRB011130 (XRF011130) Chandra Observations
  42. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  43. GRB011130 (=XRF011130): Second Revised Localization by HETE
  44. GRB 011130 I-band Observation
  45. GRB011130 (=XRF011130): Revised Localization of an X-ray
  46. GRB 011121
  47. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  48. GRB 011121: NIR observations, host galaxy?
  49. GRB 011030: TNG K-band observation
  50. XRF011030: J and K band observations
  51. GRB 011030: K-band observations
  52. GRB 011030 I-band Observation
  53. GRB011019: Subaru Optical Observations
  54. GRB 011030 I-band Observations
  55. GRB 011030 K-band Observations
  56. GRB010921, optical observations
  57. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  58. GRB010928(=H1770): Localization of a Long GRB by HETE
  59. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  60. GRB 010921 DPOSS Images Available
  61. IPN triangulation of GRB010921 (=H1761)
  62. H1761: A Bright GRB Detected by HETE
  63. Probable SGR or Short Duration GRB Detected by HETE
  64. BeppoSAX/GRBM detection of GRB010728
  65. GRB 010222 - WHT BVRI images
  66. GRB010629: Optical Observations
  67. SGR1900+14: High Fluence Burst Localized by HETE
  68. GRB010629: A Burst Localized by HETE
  69. SGR1900+14: Second Burst Localized by HETE
  70. SGR1900+14: A Burst Localized by HETE
  71. SGR1806-20: A Second, Intense Burst Localized by HETE
  72. SGR1806-20: Localization by HETE
  73. GRB010214, optical observations
  74. GRB Observation Report
  75. REVISED LOCATION OF GRB010326A
  76. GRB010326B: Localization by HETE (2nd GRB for this date)
  77. GRB010326: Refined Localization by HETE
  78. GRB010326: Localization by HETE
  79. Optical Observations of GRB 010324
  80. GRB 010222 - HEGRA GeV/TeV Observations
  81. GRB010222, possible increase of optical decay slope
  82. GRB 010220: Near-IR Observations
  83. GRB 010222: Near-IR Observations
  84. GRB010214, candidate optical afterglow
  85. GRB010214, optical observations
  86. J-Band Observation of GRB 010214.
  87. Possible InfraRed Transient of GRB 010214.
  88. GRB010214 Optical Observation
  89. GRB010213 detected by HETE
  90. GRB010126, TNG R-band observations
  91. Optical Observations of GRB 001018 at Keck
  92. H band observation of GRB 001212
  93. GRB 001109: deep JHK upper limits
  94. CORRECTION to XMM-Newton observation of GRB001025
  95. XMM-Newton observation of GRB001025
  96. V,R,I band observations of GRB000926
  97. The Likely Optical/Infrared Afterglow of GRB 001011
  98. Public availability of BeppoSAX data of GRB000926
  99. GRB000926: X-ray afterglow by BeppoSAX: revised fluxes (fwd)
  100. GRB 000926, Optical Decay

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