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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

21093 results found.

  1. Swift autonomous slewing re-enabled
  2. GRB071010b: optical observations
  3. GRB 071018: SARA observations
  4. GRB 071018: Swift-XRT observation
  5. GRB 071017 - Swift XRT observations
  6. GRB 071018: Possible OT from Xinglong TNT observation
  7. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  8. GRB 071018?: Swift detection of a possible burst
  9. GRB071013: optical observations
  10. GRB 071010B: Optical observations of EST
  11. GRB 071011: MITSuME Optical Observations
  12. GRB 070920A: deep optical observations at the NOT
  13. GRB 071010B: Photometry after 1.6 days
  14. GRB 071010B: Keck/LRIS Photometry
  15. GRB 071010B: TLS 2nd Epoch, refined analysis
  16. GRB 071013: Optical observations
  17. GRB 071013: optical observations at NOT
  18. GRB071010B, BVRcIc field calibration
  19. GRB 071011: Xinglong TNT Optical afterglow observations
  20. GRB 071010B correction to GCN 6892 optical observations
  21. GRB 071011: Swift-XRT refined analysis
  22. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  23. GRB 071011, Optical afterglow
  24. GRB 071011: P60 Optical Afterglow Candidate
  25. GRB 071010B optical photometry
  26. GRB 071010B: Gemini Spectroscopic Observations
  27. GRB 071011: Early Super-LOTIS Observations
  28. GRB 071010A: Continued Keck Imaging
  29. GRB 071011: Optical afterglow candidate
  30. Optical Observation: GRB 071010
  31. Optical observations: GRB 071010A
  32. GRB 071010A: bright NIR afterglow
  33. GRB071008: optical observations
  34. GRB 071010B possible optical transient
  35. GRB 071010B: Swift detection of a burst
  36. GRB071008: Swift-XRT observation
  37. GRB 071010 REM NIR observations
  38. GRB 071010: TAROT La Silla observatory photometry of the afterglow
  39. GRB 071010: Keck Observations of the Afterglow
  40. GRB 071010: TAROT La Silla observatory detection of the afterglow
  41. GRB 071010: Swift detection of a burst
  42. GRB 071008: Swift detection of a burst
  43. GRB 071003: XRT refined analysis
  44. Radio detection of GRB 071003 with the VLA
  45. GRB 070810B: further XRT analysis
  46. GRB 071003: VLT spectroscopy
  47. GRB071003: Faulkes Telescope North observations
  48. GRB 071003: Possible rebrightening
  49. GRB 071003 : Lulin R-band observations
  50. GRB 071003: OA power-law decay indices from KAIT
  51. GRB 071003: Keck HIRES spectroscopy
  52. GRB 071003: MARGE Observations
  53. GRB 071003 Optical observations
  54. GRB 071003: P60 Confirmation of Optical Afterglow
  55. GRB 071003: KAIT optical afterglow observations
  56. GRB 071003: Swift detection of a bright burst
  57. GRB 070714B: host galaxy spectroscopic redshift
  58. GRB 071001: Swift-XRT Team refined analysis
  59. Faulkes Telescope South observations of GRB 071001
  60. GRB 070911, SMARTS optical/IR afterglow observations
  61. GRB070925: Swift-XRT Afterglow confirmation
  62. GRB070925: Swift-XRT Position
  63. Update on Swift Status
  64. Recent SGR1806-20 Activity
  65. GRB 070920B: XRT observations
  66. GRB 070923: Swift detection of a short hard burst
  67. GRB 070920B: TAROT La Silla observatory optical observations
  68. INTEGRAL ToO observations of SGR1806-20
  69. GRB 070917: Confirmation of the X-ray afterglow
  70. GRB 070920b: LCO optical observations
  71. GRB 070920B: NOT optical observations
  72. GRB 070920B: Swift detection of a burst
  73. GRB 070920: TAROT Calern observatory optical observations
  74. GRB 070920: Swift detection of a burst
  75. GRB070917: Confirmation of optical afterglow
  76. GRB070917: optical observations
  77. GRB 070917: P60 Observations
  78. Swift Status and XRT Calibration Uncertainties
  79. GRB 070917: Swift-XRT observations
  80. GRB 070917: R band observations
  81. GRB 070917: Swift detection of a bright burst
  82. GRB 070913: SMARTS optical/IR observations
  83. GRB 070913: TAROT La Silla observatory optical observations
  84. GRB 070913: Swift detection of a burst
  85. GRB 070911: PAIRITEL IR Observations
  86. GRB 070809: Confirmation of optical transient
  87. Observations of possible TAROT GRB transient near IC 4779
  88. GRB 070810b: Image Subtraction of Multiple Keck Observations
  89. Las Campanas observations of possible TAROT GRB transient near IC
  90. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  91. GRB 070731: Swift/UVOT Upper Limit
  92. GRB 070805: UVOT afterglow candidate retraction
  93. GRB070810b: optical candidate
  94. GRB 070810B : Faulkes Telescope South Observations
  95. GRB 070810A: Continued Keck Imaging
  96. GRB 070810B: Keck spectroscopy of possible host galaxies
  97. GRB070810B: Swift/UVOT Upper Limits
  98. GRB070810B: Optical observations with KANATA
  99. GRB 070809: Swift/UVOT Upper Limits
  100. GRB 070810: ROTSE-III Detection of Optical Counterpart

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