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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"

27392 results found.

  1. VLA non-detection of GRB 071010A
  2. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  3. GRB 071011: Confirmation of P60 optical afterglow
  4. GRB 071010B: Optical Detection
  5. GRB 071011: Kanazawa Optical limits
  6. GRB 071011: P60 Optical Afterglow Candidate
  7. GRB 071011: MARGE Optical Limits
  8. GRB 071010B: Super-LOTIS upper limit
  9. GRB 071010B optical photometry
  10. GRB 071011: XRT afterglow detection
  11. GRB 071011, Swift-BAT refined analysis
  12. GRB 071010B: Gemini Spectroscopic Observations
  13. GRB 071011: NAYUTA Optical Observation
  14. GRB 071010A: Continued Keck Imaging
  15. GRB 071010B: Bright OT confirmed with TLS
  16. GRB 071011: Swift detection of a burst
  17. Optical Observation: GRB 071010
  18. Optical observations: GRB 071010A
  19. Konus-Wind observation of GRB 071010B
  20. GRB071010B: Swift/XRT detection
  21. GRB 071010B, Swift-BAT refined analysis
  22. GRB 071010A: bright NIR afterglow
  23. GRB 071006, Swift-BAT refined analysis
  24. GRB 071010A: Keck/LRIS Photometry
  25. GRB 071008, Swift-BAT refined analysis
  26. GRB 071010, Swift-BAT refined analysis
  27. GRB 071010 REM NIR observations
  28. GRB 071010: TAROT La Silla observatory detection of the afterglow
  29. GRB 071008: Swift detection of a burst
  30. GRB 071003: XRT refined analysis
  31. GRB070920A: MAGIC telescope GeV observation
  32. Radio detection of GRB 071003 with the VLA
  33. GRB 070810B: further XRT analysis
  34. GRB 071003: Possible rebrightening
  35. GRB 071003 : Lulin R-band observations
  36. GRB 071003: Keck HIRES spectroscopy
  37. GRB 071003, Swift-BAT refined analysis
  38. GRB 071003: P60 Confirmation of Optical Afterglow
  39. GRB 071001: Swift-XRT Team refined analysis
  40. GRB 071001, Swift-BAT refined analysis
  41. Faulkes Telescope South observations of GRB 071001
  42. GRB 071001: Swift detection of a burst
  43. VLA observation of GRB 070923
  44. GRB 070911, SMARTS optical/IR afterglow observations
  45. GRB 070925: Gemini South Imaging
  46. GRB070925: Swift-XRT Position
  47. GRB 070920B: ROTSE-III Early Optical Limits
  48. GRB 070925: a long GRB detected by INTEGRAL
  49. GRB 070923, Swift-BAT refined analysis
  50. GRB 070920B: XRT observations
  51. GRB 070917: Suzaku/WAM observation of the prompt emission
  52. GRB 070920B: TAROT La Silla observatory optical observations
  53. GRB 070920B, Swift-BAT refined analysis
  54. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  55. GRB 070920B: NOT optical observations
  56. GRB 070920, Swift-BAT refined analysis
  57. GRB 070920: TAROT Calern observatory optical observations
  58. GRB 070917: P60 Observations
  59. Konus-Wind observation of GRB 070917
  60. Swift Status and XRT Calibration Uncertainties
  61. GRB 070917: Swift-XRT observations
  62. GRB 070917: MITSuME Akeno Ic upper limit
  63. GRB 070917: R band observations
  64. GRB 070917, Swift-BAT refined analysis
  65. GRB 070911: Suzaku WAM observation of the prompt emission
  66. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  67. GRB 070809: The Swift evidence for the SHB nature of this burst
  68. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  69. GRB 070913: Swift-BAT refined analysis
  70. GRB 070913: SMARTS optical/IR observations
  71. GRB 070913: TAROT La Silla observatory optical observations
  72. GRB 070911: PAIRITEL IR Observations
  73. GRB 070911: Swift XRT refined analysis
  74. GRB 070911, Swift-BAT refined analysis
  75. Intense burst from SGR 1806-20 detected on September 7
  76. GRB 070809: Confirmation of optical transient
  77. Candidate Orphan GRB Optical Transient in IC 4779
  78. Las Campanas observations of possible TAROT GRB transient near IC
  79. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  80. GRB 070824 - Combined SuperAGILE/IPN Localization
  81. GRB 070731: Swift/UVOT Upper Limit
  82. GRB 070805: UVOT afterglow candidate retraction
  83. GRB 070810B : Faulkes Telescope South Observations
  84. GRB 070810A: Continued Keck Imaging
  85. GRB 070810B: Keck spectroscopy of possible host galaxies
  86. GRB070810B: Swift/UVOT Upper Limits
  87. GRB 070810B: XRT refined analysis
  88. GRB 070810B, Swift-BAT refined analysis
  89. Swift Trigger 287421: False trigger due to star tracker loss
  90. GRB 070810A: Swift-BAT refined analysis
  91. GRB 070810B: Xinglong TNT optical Upper Limit
  92. GRB070810B: Optical observations with KANATA
  93. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  94. GRB 070809: Swift/UVOT Upper Limits
  95. VLA upper limit on the short hard burst GRB 070729
  96. No radio detection in superAGILE burst 070724B
  97. GRB 070809: Keck Imaging
  98. GRB 070810: Swift-XRT Team Refined Analysis
  99. GRB 070809: Swift-XRT refined analysis
  100. GRB 070810: enhanced Swift-XRT position

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