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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.

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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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subject:"Swift"
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10955 results found.

  1. K band observation of GRB 020819
  2. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  3. IPN triangulation of GRB020819 (HETE 2275)
  4. GRB 020813: addendum to GCN 1498
  5. GRB020813: V-band decay slope
  6. Polarimetry of GRB020813: evidence for variability
  7. GRB020813: High-Resolution Optical Observations
  8. GRB020813(=H2262): Revised Localization with HETE SXC
  9. GRB020813, optical observations
  10. IPN error box for GRB020813
  11. IPN triangulation of GRB020813
  12. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  13. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  14. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  15. GRB020801: Candidate OT present in DSS
  16. HST Imaging of the Host of GRB 011121
  17. Further refinement to IPN error box for GRB020531
  18. GRB020625 (=H2081): A Long Burst Localized by HETE
  19. GRB/XRF 020427, detection of an underlying system with the VLT
  20. AXP 1E2259+586 optical observations
  21. Fading Optical Source in the Field of GRB020531
  22. GRB020405: polarimetric observations
  23. GRB 020531/Candidate Redshift
  24. GRB020531: Second epoch Chandra observations
  25. GRB020531 Optical Observations
  26. GRB020531: Observations with the Chandra X-ray Observatory
  27. GRB020531: Upper Limit for Detection of Two TAROT Sources
  28. Refined IPN error box for GRB020531
  29. GRB020531(=H2042): Optical Observations
  30. IPN triangulation of the short, hard GRB020531 (=H2042)
  31. GRB020531(=H2042): Optical Observations
  32. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  33. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  34. GRB020405 field photometry at ESO
  35. GRB020331: Third Epoch and Revised Second Epoch Optical
  36. GRB020405: VLT observations of the OT environment
  37. GRB 020409: Optical Observations
  38. X-ray afterglow of GRB020321
  39. GRB020331: Confirmation of Afterglow Candidate with Magellan
  40. GRB020405: VLT optical observations and V band decay slope
  41. GRB020331 optical observations with RIMOTS
  42. GRB020124 optical observations with RIBOTS/RIMOTS
  43. GRB 020405: Moderate-resolution spectroscopy
  44. GRB020331: Optical Observations of Afterglow Candidate
  45. GRB020405: VLT optical observations
  46. GRB020405: VLT spectroscopy
  47. V band observations of GRB020405
  48. GRB011212: Optical Observations
  49. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  50. Near-Infrared Observations of GRB020322 at TIRGO
  51. GRB 020322: Optical Sources and Improved Astrometry
  52. GRB 020322: Optical candidate
  53. XMM-Newton observation of GRB020322
  54. GRB 020317 : KISO Optical Observations
  55. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  56. GRB011130 (XRF011130) Second Epoch Chandra Observations
  57. GRB020305: Subaru Optical Observations
  58. IPN triangulation of GRB020305 (HETE 1939)
  59. GRB020305 (=H1939): Localization of a GRB by HETE
  60. IPN/HETE Detection of Bursts from SGR1900+14
  61. IPN Upper Limits to a GRB Associated With SN2002ap
  62. IPN triangulation of GRB020127 (=H1902)
  63. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  64. IPN triangulation of GRB020124 (HETE 1896)
  65. GRB020124(=H1896): Localization of a Long GRB by HETE
  66. GRB011212, Optical Observations
  67. Optical polarization observations for GRB011211
  68. Color indices of the afterglow of GRB011211
  69. GRB011212: Optical observations at Gunma
  70. GRB 011130: Optical Observations of X-ray and Radio Sources
  71. GRB 011211: TNG Spectroscopic Observations
  72. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  73. XMM-Newton observation of GRB011211
  74. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  75. GRB 011130: Optical Observations of Chandra Sources
  76. GRB 011130: Optical Observations of Chandra sources
  77. GRB011130 (XRF011130) Chandra Observations
  78. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  79. GRB011130 (=XRF011130): Second Revised Localization by HETE
  80. GRB 011130 I-band Observation
  81. GRB011130 (=XRF011130): Revised Localization of an X-ray
  82. GRB 011121
  83. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  84. GRB 011121: NIR observations, host galaxy?
  85. GRB 011030: TNG K-band observation
  86. XRF011030: J and K band observations
  87. GRB 011030: K-band observations
  88. GRB 011030 I-band Observation
  89. GRB011019: Subaru Optical Observations
  90. GRB 011030 I-band Observations
  91. GRB 011030 K-band Observations
  92. GRB010921, optical observations
  93. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  94. GRB010928(=H1770): Localization of a Long GRB by HETE
  95. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  96. GRB 010921 DPOSS Images Available
  97. IPN triangulation of GRB010921 (=H1761)
  98. H1761: A Bright GRB Detected by HETE
  99. Probable SGR or Short Duration GRB Detected by HETE
  100. BeppoSAX/GRBM detection of GRB010728

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