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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"

3283 results found.

  1. GRB071008: Swift-XRT observation
  2. GRB 071003: XRT refined analysis
  3. GRB 070810B: further XRT analysis
  4. GRB 071003: Swift XRT position
  5. GRB 071001: Swift-XRT Team refined analysis
  6. GRB070925: Swift-XRT Position
  7. GRB 070920B: XRT observations
  8. GRB 070923: Galaxies within BAT localization
  9. INTEGRAL ToO observations of SGR1806-20
  10. GRB 070917: Confirmation of the X-ray afterglow
  11. GRB 070917: Swift-XRT observations
  12. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  13. GRB 070911: PAIRITEL IR Observations
  14. GRB 070911: Swift XRT refined analysis
  15. GRB 070731: Swift/UVOT Upper Limit
  16. GRB 070810B: XRT refined analysis
  17. GRB 070810: Swift-XRT Team Refined Analysis
  18. GRB 070809: Swift-XRT refined analysis
  19. GRB 070805: Swift XRT initial analysis.
  20. GRB 070724B: Swift-XRT afterglow confirmation
  21. GRB 070802: Swift-XRT refined analysis
  22. GRB 070802: GROND J band candidate
  23. GRB 070729: Swift-XRT refined analysis
  24. GRB 070729: Magellan NIR Observations
  25. GRB 070724: P60 and Gemini Observations
  26. GRB 070724: Swift-XRT Team refined analysis
  27. GRB 070721A: Swift/XRT refined analysis
  28. GRB 070714A: Swift XRT refined analysis
  29. GRB070714B: Swift-XRT refined analysis
  30. GRB 070707: Swift-XRT follow-up observations
  31. Swift XRT observation of GRB 070707
  32. GRB 070628: Swift XRT refined analysis
  33. GRB070621: Swift XRT refined analysis
  34. GRB 070616: Swift XRT refined circular
  35. GRB 070612B: Swift-XRT refined analysis
  36. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  37. GRB 070610: Swift-XRT refined analysis
  38. GRB 070611: Swift-XRT refined analysis
  39. GRB 070611; Swift-XRT position
  40. GRB 070610; Swift-XRT position
  41. GRB 070529: Swift-XRT refined analysis
  42. GRB 070521: Swift-XRT refined analysis
  43. GRB070521: Gemini Observations
  44. GROND upper limits of GRB 070521
  45. GRB 070520B: Swift-XRT refined analysis
  46. GRB 070520A: Swift-XRT refined analysis
  47. GRB 070518: Swift-XRT refined analysis
  48. GRB 070508: Swift-XRT refined analysis
  49. GRB 070429A: Swift XRT further analysis
  50. GRB 070420: Swift XRT refined analysis
  51. GBR 070419A: Swift/XRT refined analysis
  52. GRB 070419B: Swift XRT refined analysis
  53. GRB 070419A: Optical and IR observations with KANATA
  54. GRB 070418: Optical and IR observations with KANATA
  55. GRB 070406: Swift XRT refined analysis
  56. GRB 070411: Swift-XRT refined analysis
  57. GRB 070406: Swift XRT team further analysis
  58. Suzaku ToO observation of SGR 1806-20
  59. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  60. GRB 070406: Gemini South Imaging and XRT analysis
  61. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  62. GRB 070330: Swift-XRT refined analysis
  63. GRB 070328: Swift/XRT Refined Analysis
  64. GRB070318: Swift-XRT refined analysis
  65. GRB 070311: Swift-XRT refined analysis
  66. GRB 070125: Chandra X-ray Confirmation of Jet Break
  67. GRB 070125: X-ray light curve analysis
  68. GRB 070306: XRT Team Refined Analysis
  69. GRB 070306: Optical and IR observations with KANATA
  70. GRB070224: Swift-XRT Refined Analysis
  71. GRB 070223: Optical-IR observation with KANATA
  72. GRB 070223: Swift-XRT Refined Analysis
  73. GRB 070209: Swift XRT refined analysis
  74. GRB 070219: XRT Refined Analysis
  75. GRB 070209: Swift XRT analysis
  76. GRB 070201: clarification on localization and Konus-Wind spectra
  77. GRB 070208: Swift XRT refined analysis
  78. GRB 070208: Early IR detection and afterglow astrometry
  79. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  80. GRB070124: Swift-XRT Observation
  81. GRB070125: Swift-XRT Refined Analysis
  82. GRB 070110: Ep,i - Eiso correlation
  83. GRB 070110 declared a "Burst of Interest" by Swift team
  84. GRB070110: Swift XRT Team refined analysis
  85. GRB070107: Swift/XRT refined analysis
  86. GRB070103: Swift XRT refined analysis
  87. GRB061222a: optical observations
  88. GRB 061210: Swift/XRT Astrometry Correction
  89. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  90. GRB 061222A: Gemini Afterglow Candidate
  91. GRB061210: Swift/UVOT observations
  92. GRB061126: update on the Swift-XRT afterglow light curve
  93. GRB 061201: Swift XRT Team refined analysis
  94. GRB061126: Optical afterglow observations from MIRO
  95. GRB 061126: Swift-XRT refined analysis
  96. GRB 061126: Early Detection of the IR Afterglow
  97. GRB061122: Swift-XRT position
  98. GRB 061028: Swift/XRT Astrometry Correction
  99. GRB 061004: Swift/XRT Astrometry Correction
  100. GRB 060801: Swift/XRT Astrometry Correction

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