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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.

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"

3344 results found.

  1. Swift XRT and UVOT observations of GRB080414
  2. GRB 080413B: Swift XRT refined analysis
  3. GRB 080413A: Swift-XRT refined analysis
  4. GRB 080411: Swift-XRT Refined Analysis
  5. GRB 080409: Swift XRT refined analysis
  6. GRB 080408: Swift-XRT position of a possible afterglow
  7. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  8. GRB080330: Swift XRT refined analysis
  9. GRB 080328: Swift XRT refined analysis
  10. GRB 080325: Subaru detection of NIR afterglow candidate
  11. GRB080325: XRT Refined Analysis
  12. GRB 080319D: Swift XRT refined analysis
  13. GRB 080319B: Swift-XRT Team Refined Analysis
  14. Swift trigger 306323: Swift-BAT/XRT refined analysis
  15. GRB 080310: Swift/UVOT Refined Analysis
  16. GRB 080307: Swift-XRT Team refined analysis
  17. Swift UVOT observations of GRB080229B
  18. GRB080229B: Swift XRT afterglow observation
  19. GRB080229: Swift XRT refined analysis
  20. ESO optical and NIR observations of GRB 080218B
  21. GRB 080218B: Swift-XRT refined analysis
  22. GRB 080212: Swift-XRT Team refined analysis
  23. GRB 080207: Swift-XRT Refined Analysis
  24. GRB 080205: Swift XRT refined analysis
  25. GRB 080130: further Swift XRT observations confirm fading source
  26. GRB 080129: Swift-XRT refined analysis
  27. GRB 080121: Upper limit on X-ray afterglow
  28. SNe 2008D and 2007uy: Chandra Detections
  29. GRB 080123: Swift-XRT refined analysis
  30. GRB 080120: Swift-XRT refined analysis
  31. GRB080120: Swift XRT position
  32. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  33. Refined Swift-XRT analysis of the transient in NGC 2770
  34. GRB 071122 Swift-XRT refined analysis
  35. GRB 071117: Swift-XRT revised position
  36. Swift XRT follow-up observations of GRB071008
  37. GRB071118: Swift XRT refined analysis
  38. GRB 071117: Swift-XRT refined analysis
  39. GRB 071112C: Optical and NIR data observed with KANATA
  40. GRB 071112C: Swift XRT refined analysis
  41. GRB 071112B: Swift-XRT preliminary analysis
  42. Swift XRT follow-up observations of GRB071028B
  43. GRB 071109: further Swift-XRT analysis
  44. GRB 071109: Swift-XRT possible X-ray counterpart
  45. GRB 071104: Swift-XRT Team Refined Analysis
  46. GRB 071104: Possible Swift UVOT Afterglow Candidate
  47. GRB 071104: Swift-XRT position
  48. Swift XRT and UVOT observations of GRB071028B
  49. GRB071101: Optical and NIR upper limits by KANATA
  50. GRB 071101: Swift XRT position
  51. GRB 071031: Swift-XRT Team refined analysis
  52. GRB 071028: Swift-XRT Team refined analysis
  53. GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays
  54. GRB 071025: Swift-XRT Team refined analysis
  55. GRB071021 : CFHT Ks-band observation
  56. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  57. GRB 071021: Swift-XRT Team refined analysis
  58. GRB 071018: Swift-XRT observation
  59. GRB 071017 - Swift XRT observations
  60. GRB 071011: Swift-XRT refined analysis
  61. GRB 071010: Swift-XRT observation
  62. GRB071008: Swift-XRT observation
  63. GRB 071003: XRT refined analysis
  64. GRB 070810B: further XRT analysis
  65. GRB 071003: Swift XRT position
  66. GRB 071001: Swift-XRT Team refined analysis
  67. GRB070925: Swift-XRT Position
  68. GRB 070920B: XRT observations
  69. GRB 070923: Galaxies within BAT localization
  70. INTEGRAL ToO observations of SGR1806-20
  71. GRB 070917: Confirmation of the X-ray afterglow
  72. GRB 070917: Swift-XRT observations
  73. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  74. GRB 070911: PAIRITEL IR Observations
  75. GRB 070911: Swift XRT refined analysis
  76. GRB 070731: Swift/UVOT Upper Limit
  77. GRB 070810B: XRT refined analysis
  78. GRB 070810: Swift-XRT Team Refined Analysis
  79. GRB 070809: Swift-XRT refined analysis
  80. GRB 070805: Swift XRT initial analysis.
  81. GRB 070724B: Swift-XRT afterglow confirmation
  82. GRB 070802: Swift-XRT refined analysis
  83. GRB 070802: GROND J band candidate
  84. GRB 070729: Swift-XRT refined analysis
  85. GRB 070729: Magellan NIR Observations
  86. GRB 070724: P60 and Gemini Observations
  87. GRB 070724: Swift-XRT Team refined analysis
  88. GRB 070721A: Swift/XRT refined analysis
  89. GRB 070714A: Swift XRT refined analysis
  90. GRB070714B: Swift-XRT refined analysis
  91. GRB 070707: Swift-XRT follow-up observations
  92. Swift XRT observation of GRB 070707
  93. GRB 070628: Swift XRT refined analysis
  94. GRB070621: Swift XRT refined analysis
  95. GRB 070616: Swift XRT refined circular
  96. GRB 070612B: Swift-XRT refined analysis
  97. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  98. GRB 070610: Swift-XRT refined analysis
  99. GRB 070611: Swift-XRT refined analysis
  100. GRB 070611; Swift-XRT position

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