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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

27406 results found.

  1. GRB 071011: MITSuME Optical Observations
  2. GRB 070920A: deep optical observations at the NOT
  3. GRB 071010B: Keck/LRIS Photometry
  4. GRB 071013: TLS Upper Limit
  5. VLA non-detection of GRB 071011
  6. GRB 071013: Optical observations
  7. GRB 071013: optical observations at NOT
  8. GRB 071013, Swift-BAT refined analysis
  9. GRB071010B, BVRcIc field calibration
  10. GRB 20071013: Xinglong TNT optical Upper Limit
  11. GRB 071010C Swift-BAT detection of a burst
  12. GRB 071011: Optical Limit after 13.95hrs
  13. GRB 071010B correction to GCN 6892 optical observations
  14. GRB 071011: Swift-XRT refined analysis
  15. VLA non-detection of GRB 071010A
  16. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  17. GRB 071011: Confirmation of P60 optical afterglow
  18. GRB 071010B: Optical Detection
  19. GRB 071011: Kanazawa Optical limits
  20. GRB 071011: P60 Optical Afterglow Candidate
  21. GRB 071011: MARGE Optical Limits
  22. GRB 071010B: Super-LOTIS upper limit
  23. GRB 071010B optical photometry
  24. GRB 071011: XRT afterglow detection
  25. GRB 071011, Swift-BAT refined analysis
  26. GRB 071010B: Gemini Spectroscopic Observations
  27. GRB 071011: NAYUTA Optical Observation
  28. GRB 071010A: Continued Keck Imaging
  29. GRB 071010B: Bright OT confirmed with TLS
  30. GRB 071011: Swift detection of a burst
  31. Optical Observation: GRB 071010
  32. Optical observations: GRB 071010A
  33. Konus-Wind observation of GRB 071010B
  34. GRB071010B: Swift/XRT detection
  35. GRB 071010B, Swift-BAT refined analysis
  36. GRB 071010A: bright NIR afterglow
  37. GRB 071006, Swift-BAT refined analysis
  38. GRB 071010A: Keck/LRIS Photometry
  39. GRB 071008, Swift-BAT refined analysis
  40. GRB 071010, Swift-BAT refined analysis
  41. GRB 071010 REM NIR observations
  42. GRB 071010: TAROT La Silla observatory detection of the afterglow
  43. GRB 071008: Swift detection of a burst
  44. GRB 071003: XRT refined analysis
  45. GRB070920A: MAGIC telescope GeV observation
  46. Radio detection of GRB 071003 with the VLA
  47. GRB 070810B: further XRT analysis
  48. GRB 071003: Possible rebrightening
  49. GRB 071003 : Lulin R-band observations
  50. GRB 071003: Keck HIRES spectroscopy
  51. GRB 071003, Swift-BAT refined analysis
  52. GRB 071003: P60 Confirmation of Optical Afterglow
  53. GRB 071001: Swift-XRT Team refined analysis
  54. GRB 071001, Swift-BAT refined analysis
  55. Faulkes Telescope South observations of GRB 071001
  56. GRB 071001: Swift detection of a burst
  57. VLA observation of GRB 070923
  58. GRB 070911, SMARTS optical/IR afterglow observations
  59. GRB 070925: Gemini South Imaging
  60. GRB070925: Swift-XRT Position
  61. GRB 070920B: ROTSE-III Early Optical Limits
  62. GRB 070925: a long GRB detected by INTEGRAL
  63. GRB 070923, Swift-BAT refined analysis
  64. GRB 070920B: XRT observations
  65. GRB 070917: Suzaku/WAM observation of the prompt emission
  66. GRB 070920B: TAROT La Silla observatory optical observations
  67. GRB 070920B, Swift-BAT refined analysis
  68. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  69. GRB 070920B: NOT optical observations
  70. GRB 070920, Swift-BAT refined analysis
  71. GRB 070920: TAROT Calern observatory optical observations
  72. GRB 070917: P60 Observations
  73. Konus-Wind observation of GRB 070917
  74. Swift Status and XRT Calibration Uncertainties
  75. GRB 070917: Swift-XRT observations
  76. GRB 070917: MITSuME Akeno Ic upper limit
  77. GRB 070917: R band observations
  78. GRB 070917, Swift-BAT refined analysis
  79. GRB 070911: Suzaku WAM observation of the prompt emission
  80. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  81. GRB 070809: The Swift evidence for the SHB nature of this burst
  82. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  83. GRB 070913: Swift-BAT refined analysis
  84. GRB 070913: SMARTS optical/IR observations
  85. GRB 070913: TAROT La Silla observatory optical observations
  86. GRB 070911: PAIRITEL IR Observations
  87. GRB 070911: Swift XRT refined analysis
  88. GRB 070911, Swift-BAT refined analysis
  89. Intense burst from SGR 1806-20 detected on September 7
  90. GRB 070809: Confirmation of optical transient
  91. Candidate Orphan GRB Optical Transient in IC 4779
  92. Las Campanas observations of possible TAROT GRB transient near IC
  93. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  94. GRB 070824 - Combined SuperAGILE/IPN Localization
  95. GRB 070731: Swift/UVOT Upper Limit
  96. GRB 070805: UVOT afterglow candidate retraction
  97. GRB 070810B : Faulkes Telescope South Observations
  98. GRB 070810A: Continued Keck Imaging
  99. GRB 070810B: Keck spectroscopy of possible host galaxies
  100. GRB070810B: Swift/UVOT Upper Limits

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