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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. GRB 070610; Swift-XRT position
  2. GRB 070529: Swift-XRT refined analysis
  3. GRB 070521: Swift-XRT refined analysis
  4. GRB070521: Gemini Observations
  5. GROND upper limits of GRB 070521
  6. GRB 070520B: Swift-XRT refined analysis
  7. GRB 070520A: Swift-XRT refined analysis
  8. GRB 070518: Swift-XRT refined analysis
  9. GRB 070508: Swift-XRT refined analysis
  10. GRB 070429A: Swift XRT further analysis
  11. GRB 070420: Swift XRT refined analysis
  12. GBR 070419A: Swift/XRT refined analysis
  13. GRB 070419B: Swift XRT refined analysis
  14. GRB 070419A: Optical and IR observations with KANATA
  15. GRB 070418: Optical and IR observations with KANATA
  16. GRB 070406: Swift XRT refined analysis
  17. GRB 070411: Swift-XRT refined analysis
  18. GRB 070406: Swift XRT team further analysis
  19. Suzaku ToO observation of SGR 1806-20
  20. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  21. GRB 070406: Gemini South Imaging and XRT analysis
  22. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  23. GRB 070330: Swift-XRT refined analysis
  24. GRB 070328: Swift/XRT Refined Analysis
  25. GRB070318: Swift-XRT refined analysis
  26. GRB 070311: Swift-XRT refined analysis
  27. GRB 070125: Chandra X-ray Confirmation of Jet Break
  28. GRB 070125: X-ray light curve analysis
  29. GRB 070306: XRT Team Refined Analysis
  30. GRB 070306: Optical and IR observations with KANATA
  31. GRB070224: Swift-XRT Refined Analysis
  32. GRB 070223: Optical-IR observation with KANATA
  33. GRB 070223: Swift-XRT Refined Analysis
  34. GRB 070209: Swift XRT refined analysis
  35. GRB 070219: XRT Refined Analysis
  36. GRB 070209: Swift XRT analysis
  37. GRB 070201: clarification on localization and Konus-Wind spectra
  38. GRB 070208: Swift XRT refined analysis
  39. GRB 070208: Early IR detection and afterglow astrometry
  40. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  41. GRB070124: Swift-XRT Observation
  42. GRB070125: Swift-XRT Refined Analysis
  43. GRB 070110: Ep,i - Eiso correlation
  44. GRB 070110 declared a "Burst of Interest" by Swift team
  45. GRB070110: Swift XRT Team refined analysis
  46. GRB070107: Swift/XRT refined analysis
  47. GRB070103: Swift XRT refined analysis
  48. GRB061222a: optical observations
  49. GRB 061210: Swift/XRT Astrometry Correction
  50. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  51. GRB 061222A: Gemini Afterglow Candidate
  52. GRB061210: Swift/UVOT observations
  53. GRB061126: update on the Swift-XRT afterglow light curve
  54. GRB 061201: Swift XRT Team refined analysis
  55. GRB061126: Optical afterglow observations from MIRO
  56. GRB 061126: Swift-XRT refined analysis
  57. GRB 061126: Early Detection of the IR Afterglow
  58. GRB061122: Swift-XRT position
  59. GRB 061028: Swift/XRT Astrometry Correction
  60. GRB 061004: Swift/XRT Astrometry Correction
  61. GRB 060801: Swift/XRT Astrometry Correction
  62. GRB061028: XRT refined analysis
  63. GRB 061027, Swift refined analysis of a possible burst
  64. GRB061025: Swift XRT refined analysis
  65. GRB 061021: Swift-XRT refined analysis
  66. GRB061019: Swift XRT refined analysis
  67. GRB 061006: astrometry-corrected XRT position
  68. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  69. GRB 061006: Swift-XRT Team Refined Analysis
  70. GRB 061004: Swift-XRT Team Refined Analysis
  71. GRB 061004: Nearby 2MASS Galaxy
  72. GRB 060928: Swift observations
  73. GRB 061002: Swift-XRT Team Refined Analysis
  74. GRB 060927: Swift XRT Team refined analysis
  75. GRB 060926: Swift XRT refined analysis
  76. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  77. GRB 060923C: Swift XRT refined analysis
  78. GRB 060923A: Keck and Gemini Observations
  79. GRB060919: XRT refined analysis
  80. GRB 060912: Swift XRT Team Refined Analysis
  81. GRB 060908, Swift/XRT refined analysis
  82. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  83. GRB 060904A: Subaru NIR observation
  84. GRB 060904B: Swift-XRT refined analysis
  85. GRB 060904A: Swift-XRT refined analysis
  86. GRB 060901: Swift/XRT Refined Analysis
  87. GRB060826 - SDSS Pre-Burst Observations
  88. GRB060729: analysis of XMM-Newton observation
  89. GRB060814: Break in the XRT light curve
  90. GRB060813: Break in the XRT light curve
  91. GRB 060814: P200 NIR Observations
  92. GRB 060814: Swift XRT refined analysis
  93. GRB 060813: Swift XRT refined analysis
  94. A dust-scattering halo detected around SGR 1806-20
  95. GRB 060729: An update on the Swift XRT and UVOT observations
  96. GRB 060805B: XRT Team Analysis
  97. GRB 060807: XRT Team refined analysis
  98. GRB 060805: XRT Team Refined Analysis
  99. GRB 060801: Swift XRT refined analysis
  100. GRB 060729: Swift-XRT refined analysis

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