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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"

6473 results found.

  1. GRB070110: Swift XRT Team refined analysis
  2. GRB070107: Swift/XRT refined analysis
  3. GRB070103: Swift XRT refined analysis
  4. GRB061222a: optical observations
  5. GRB 061210: Swift/XRT Astrometry Correction
  6. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  7. GRB 061222A: Gemini Afterglow Candidate
  8. GRB 061217: Extended object in the revised XRT error circle
  9. GRB061210: Swift/UVOT observations
  10. Optical Afterglow observations of GRB 061126
  11. GRB061126: optical observations
  12. GRB061126: update on the Swift-XRT afterglow light curve
  13. GRB 061201: Swift XRT Team refined analysis
  14. GRB 061201, Swift-BAT refined analysis of the SHB
  15. GRB061126: Optical afterglow observations from MIRO
  16. GRB 061126: Swift-XRT refined analysis
  17. GRB 061126: SARA Observations
  18. GRB 061126: Early Detection of the IR Afterglow
  19. GRB 061121: MDM Optical Decay
  20. GRB061122: Swift-XRT position
  21. GRB 061121: MDM Optical Observations
  22. GRB061028: MAGIC telescope GeV observation
  23. GRB 061028: Swift/XRT Astrometry Correction
  24. GRB 061004: Further VLT/NTT observations
  25. GRB 061028: Optical R passband observations
  26. GRB 061004: Swift/XRT Astrometry Correction
  27. GRB 060801: Swift/XRT Astrometry Correction
  28. GRB 061028: SARA upper limit
  29. GRB061028: XRT refined analysis
  30. GRB 061028, Swift-BAT refined analysis
  31. GRB 061027, Swift refined analysis of a possible burst
  32. GRB061025: Swift XRT refined analysis
  33. GRB 061021: Swift-XRT refined analysis
  34. GRB061019: Swift XRT refined analysis
  35. GRB 061006: astrometry-corrected XRT position
  36. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  37. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  38. GRB 061006: Swift-XRT Team Refined Analysis
  39. GRB 061004: Swift-XRT Team Refined Analysis
  40. GRB 061004: Nearby 2MASS Galaxy
  41. GRB 060928: Swift observations
  42. GRB 061002: Swift-XRT Team Refined Analysis
  43. GRB 060927: Early color
  44. GRB 060927: Swift XRT Team refined analysis
  45. GRB 060926: Swift XRT refined analysis
  46. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  47. GRB 060923C: Swift XRT refined analysis
  48. GRB 060923A: Keck and Gemini Observations
  49. GRB 060919, Swift-BAT refined analysis
  50. GRB060919: XRT refined analysis
  51. GRB 060919: Swift detection of a burst
  52. GRB060825: MAGIC telescope GeV observation
  53. GRB 060912: Swift XRT Team Refined Analysis
  54. GRB 060908, Swift/XRT refined analysis
  55. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  56. GRB 060904A : Optical limit
  57. GRB 060904A: Subaru NIR observation
  58. GRB 060904B: Swift-XRT refined analysis
  59. GRB 060904A: Swift-XRT refined analysis
  60. GRB 060901: Swift/XRT Refined Analysis
  61. GRB 060605, observations using an Integral Field Unit
  62. GRB060729: analysis of XMM-Newton observation
  63. GRB060814: Break in the XRT light curve
  64. GRB060813: Break in the XRT light curve
  65. GRB 060814: P200 NIR Observations
  66. GRB 060814: Swift XRT refined analysis
  67. GRB060813: Swift/UVOT upper limits
  68. GRB 060813: Swift XRT refined analysis
  69. A dust-scattering halo detected around SGR 1806-20
  70. GRB 060729: An update on the Swift XRT and UVOT observations
  71. GRB 060805B: XRT Team Analysis
  72. GRB 060807: XRT Team refined analysis
  73. GRB 060807: Kanazawa R-band observation
  74. GRB060805 Liverpool Telescope observations
  75. GRB 060805: XRT Team Refined Analysis
  76. GRB 060801: Swift XRT refined analysis
  77. GRB 060801: Kanazawa Optical Observation
  78. GRB 060729: Swift-XRT refined analysis
  79. GRB 060719: near-infrared afterglow
  80. GRB 060719: VLT/ISAAC observations
  81. GRB 060719: XRT refined analysis
  82. GRB 060719: LCO optical observations
  83. GRB 060717: Swift XRT refined analysis
  84. GRB 060714: OA fading and a possible host detection
  85. GRB 060714: Swift XRT refined analysis
  86. GRB 060712: XRT refined analysis
  87. GRB 060712: XRT refined position
  88. GRB 060708: Swift-XRT refined analysis
  89. GRB 060707: Swift-XRT refined analysis
  90. GRB050326: Host Galaxy Candidates
  91. GRB050124: Possible Host Galaxy
  92. GRB050223: Host Galaxy
  93. GRB060512: near IR observations
  94. GRB060614: Swift-XRT refined analysis
  95. GRB 060602A: Swift/XRT analysis
  96. GRB 060605: Swift-XRT Team refined analysis
  97. GRB 060604: Swift-XRT Team refined analysis
  98. GRB 060602B: RTT150 optical observations
  99. GRB 060502A: Optical afterglow observations
  100. GRB 060526: Break in X-ray light curve

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