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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"

3402 results found.

  1. GRB 071109: further Swift-XRT analysis
  2. GRB 071109: Swift-XRT possible X-ray counterpart
  3. GRB 071104: Swift-XRT Team Refined Analysis
  4. GRB 071104: Possible Swift UVOT Afterglow Candidate
  5. GRB 071104: Swift-XRT position
  6. Swift XRT and UVOT observations of GRB071028B
  7. GRB071101: Optical and NIR upper limits by KANATA
  8. GRB 071101: Swift XRT position
  9. GRB 071031: Swift-XRT Team refined analysis
  10. GRB 071028: Swift-XRT Team refined analysis
  11. GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays
  12. GRB 071025: Swift-XRT Team refined analysis
  13. GRB071021 : CFHT Ks-band observation
  14. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  15. GRB 071021: Swift-XRT Team refined analysis
  16. GRB 071018: Swift-XRT observation
  17. GRB 071017 - Swift XRT observations
  18. GRB 071011: Swift-XRT refined analysis
  19. GRB 071010: Swift-XRT observation
  20. GRB071008: Swift-XRT observation
  21. GRB 071003: XRT refined analysis
  22. GRB 070810B: further XRT analysis
  23. GRB 071003: Swift XRT position
  24. GRB 071001: Swift-XRT Team refined analysis
  25. GRB070925: Swift-XRT Position
  26. GRB 070920B: XRT observations
  27. GRB 070923: Galaxies within BAT localization
  28. INTEGRAL ToO observations of SGR1806-20
  29. GRB 070917: Confirmation of the X-ray afterglow
  30. GRB 070917: Swift-XRT observations
  31. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  32. GRB 070911: PAIRITEL IR Observations
  33. GRB 070911: Swift XRT refined analysis
  34. GRB 070731: Swift/UVOT Upper Limit
  35. GRB 070810B: XRT refined analysis
  36. GRB 070810: Swift-XRT Team Refined Analysis
  37. GRB 070809: Swift-XRT refined analysis
  38. GRB 070805: Swift XRT initial analysis.
  39. GRB 070724B: Swift-XRT afterglow confirmation
  40. GRB 070802: Swift-XRT refined analysis
  41. GRB 070802: GROND J band candidate
  42. GRB 070729: Swift-XRT refined analysis
  43. GRB 070729: Magellan NIR Observations
  44. GRB 070724: P60 and Gemini Observations
  45. GRB 070724: Swift-XRT Team refined analysis
  46. GRB 070721A: Swift/XRT refined analysis
  47. GRB 070714A: Swift XRT refined analysis
  48. GRB070714B: Swift-XRT refined analysis
  49. GRB 070707: Swift-XRT follow-up observations
  50. Swift XRT observation of GRB 070707
  51. GRB 070628: Swift XRT refined analysis
  52. GRB070621: Swift XRT refined analysis
  53. GRB 070616: Swift XRT refined circular
  54. GRB 070612B: Swift-XRT refined analysis
  55. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  56. GRB 070610: Swift-XRT refined analysis
  57. GRB 070611: Swift-XRT refined analysis
  58. GRB 070611; Swift-XRT position
  59. GRB 070610; Swift-XRT position
  60. GRB 070529: Swift-XRT refined analysis
  61. GRB 070521: Swift-XRT refined analysis
  62. GRB070521: Gemini Observations
  63. GROND upper limits of GRB 070521
  64. GRB 070520B: Swift-XRT refined analysis
  65. GRB 070520A: Swift-XRT refined analysis
  66. GRB 070518: Swift-XRT refined analysis
  67. GRB 070508: Swift-XRT refined analysis
  68. GRB 070429A: Swift XRT further analysis
  69. GRB 070420: Swift XRT refined analysis
  70. GBR 070419A: Swift/XRT refined analysis
  71. GRB 070419B: Swift XRT refined analysis
  72. GRB 070419A: Optical and IR observations with KANATA
  73. GRB 070418: Optical and IR observations with KANATA
  74. GRB 070406: Swift XRT refined analysis
  75. GRB 070411: Swift-XRT refined analysis
  76. GRB 070406: Swift XRT team further analysis
  77. Suzaku ToO observation of SGR 1806-20
  78. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  79. GRB 070406: Gemini South Imaging and XRT analysis
  80. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  81. GRB 070330: Swift-XRT refined analysis
  82. GRB 070328: Swift/XRT Refined Analysis
  83. GRB070318: Swift-XRT refined analysis
  84. GRB 070311: Swift-XRT refined analysis
  85. GRB 070125: Chandra X-ray Confirmation of Jet Break
  86. GRB 070125: X-ray light curve analysis
  87. GRB 070306: XRT Team Refined Analysis
  88. GRB 070306: Optical and IR observations with KANATA
  89. GRB070224: Swift-XRT Refined Analysis
  90. GRB 070223: Optical-IR observation with KANATA
  91. GRB 070223: Swift-XRT Refined Analysis
  92. GRB 070209: Swift XRT refined analysis
  93. GRB 070219: XRT Refined Analysis
  94. GRB 070209: Swift XRT analysis
  95. GRB 070201: clarification on localization and Konus-Wind spectra
  96. GRB 070208: Swift XRT refined analysis
  97. GRB 070208: Early IR detection and afterglow astrometry
  98. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  99. GRB070124: Swift-XRT Observation
  100. GRB070125: Swift-XRT Refined Analysis

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