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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"

28284 results found.

  1. GRB 080507: Keck photometry
  2. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  3. GRB 080503: Hubble Space Telescope Imaging
  4. GRB 080507: Optical Afterglow
  5. GRB 080506:Optical observations from HCT
  6. GRB 080506: VLA radio upper limit
  7. GRB 080507: GRB localization by SuperAGILE
  8. GRB 080506: Swift XRT refined analysis
  9. GRB080506: Swift/UVOT observations
  10. GRB 080506, Swift-BAT refined analysis
  11. GRB080503, RIMOTS optical upper limit
  12. GRB 080506: Observations from NOT
  13. GRB 080506: Enhanced Swift-XRT position
  14. GRB 080506: Swift detection of a burst with optical afterglow
  15. GRB 080503: VLA radio upper limit
  16. GRB 080503: Observations from NOT
  17. GRB 080503: Slow-rise optical AG ?
  18. GRB 080430: TLS imaging one day after the GRB
  19. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  20. GRB080503 XRT refined analysis
  21. GRB 080503, Swift-BAT refined analysis
  22. GRB 080430
  23. GRB 080503: Enhanced Swift-XRT position
  24. GRB 080503: New candidate afterglow/host in Gemini imaging
  25. GRB 080503: Swift detection of a short burst
  26. GRB080430: Swift/UVOT observations
  27. VLA radio upper limit on GRB 080430
  28. GRB 080430, Swift-BAT refined analysis
  29. GRB 080430: Swift-XRT refined analysis
  30. GRB 080430: Enhanced Swift-XRT position
  31. GRB 080430: Spectroscopy from CAHA
  32. GRB 080430 - SDSS Pre-Burst Observations
  33. GRB 080430: Bootes observation
  34. GRB 080430: Swift detection of a burst with optical afterglow
  35. GRB 080430: TAROT Calern observatory optical observations
  36. GRB 080426: Swift-XRT refined analysis
  37. GRB080426: Swift/UVOT upper limits
  38. GRB 080426: Enhanced Swift-XRT position
  39. GRB 080426, Swift-BAT refined analysis
  40. GRB 080426: Swift detection of a possibly short burst
  41. Possible GRB 080315: XRT non-detection of afterglow
  42. GRB 080320 : Faulkes Telescope North Observations
  43. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  44. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  45. GRB080310, BVRcIc field calibration
  46. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  47. Swift XRT and UVOT observations of GRB080414
  48. GRB 080319B: Jet Break, Energetics, Supernova
  49. GRB 080413B: Faulkes Telescope South optical afterglow observations
  50. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  51. GRB 080413A: Suzaku WAM observation of the prompt emission
  52. GRB 080413B: Suzaku WAM observation of the prompt emission
  53. GRB 080414: RTT150 optical observations
  54. GRB 080414: A long GRB detected by INTEGRAL
  55. VLA radio observations of GRB 080413B
  56. VLA radio observations of GRB 080413A
  57. GRB 080413B: Ep,i-Eiso correlation
  58. GRB080413B
  59. Swift-BAT spectral lag analysis of GRB 080413B
  60. GRB 080413a, SMARTS optical/IR afterglow observations
  61. GRB080413A: Swift/UVOT observations
  62. GRB 080413B, Swift-BAT refined analysis
  63. GRB 080413A: Swift-XRT refined analysis
  64. GRB 080413A, Swift-BAT refined analysis
  65. GRB 080413A Bootes observation
  66. GRB080413B: REM NIR & Optical Observation
  67. GRB 080413B: GROND detection of afterglow in all bands
  68. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  69. GRB 080413A: REM detection of the NIR Afterglow
  70. GRB 080413: Enhanced Swift-XRT position
  71. GRB 080413: TAROT Calern observatory optical observations
  72. GRB 080413: Swift detection of a burst with an optical afterglow
  73. GRB 080413: ROTSE-III Detection of Optical Counterpart
  74. GRB 080411: Swift/UVOT refined analysis
  75. GRB 080411, Swift-BAT refined analysis
  76. GRB 080411: Swift-XRT Refined Analysis
  77. GRB 080411: Enhanced Swift-XRT position
  78. GRB 080411: GROND detection of optical afterglow candidate
  79. GRB 080411: Swift detection of a bright burst
  80. GRB 080409: Swift-BAT refined analysis
  81. GRB 080408: GROND detection of optical/NIR afterglow candidate
  82. GRB 080330 optical observations
  83. Swift/UVOT observations of GRB080409
  84. GRB 080409: Swift XRT refined analysis
  85. GRB 080408: Swift-XRT position of a possible afterglow
  86. GRB 080409: Enhanced Swift-XRT position
  87. GRB 080409: REM optical/NIR observations
  88. GRB 080409: Swift detection of a burst
  89. GRB 080408: Analysis of AGILE Gamma-ray data
  90. GRB 080408: GRB Localization by SuperAGILE
  91. GRB 080319A: Early RAPTOR optical limits
  92. GRB 080319B: HST observations
  93. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  94. GRB 080405: Swift-BAT refined analysis
  95. GRB 080405: Swift-XRT position
  96. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  97. GRB 080325: optical upper limit
  98. GRB 080328: GAO 150cm telescope Optical Observation
  99. GRB080330: Improved Swift XRT Position
  100. GRB080330: optical observations

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