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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"

26276 results found.

  1. GRB080506: Swift/UVOT observations
  2. GRB 080506, Swift-BAT refined analysis
  3. GRB080503, RIMOTS optical upper limit
  4. GRB 080506: Observations from NOT
  5. GRB 080506: Enhanced Swift-XRT position
  6. GRB 080506: Swift detection of a burst with optical afterglow
  7. GRB 080503: VLA radio upper limit
  8. GRB 080503: Observations from NOT
  9. GRB 080503: Slow-rise optical AG ?
  10. GRB 080430: TLS imaging one day after the GRB
  11. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  12. GRB080503 XRT refined analysis
  13. GRB 080503, Swift-BAT refined analysis
  14. GRB 080430
  15. GRB 080503: Enhanced Swift-XRT position
  16. GRB 080503: New candidate afterglow/host in Gemini imaging
  17. GRB 080503: Swift detection of a short burst
  18. GRB080430: Swift/UVOT observations
  19. VLA radio upper limit on GRB 080430
  20. GRB 080430, Swift-BAT refined analysis
  21. GRB 080430: Swift-XRT refined analysis
  22. GRB 080430: Enhanced Swift-XRT position
  23. GRB 080430: Spectroscopy from CAHA
  24. GRB 080430 - SDSS Pre-Burst Observations
  25. GRB 080430: Bootes observation
  26. GRB 080430: Swift detection of a burst with optical afterglow
  27. GRB 080430: TAROT Calern observatory optical observations
  28. GRB 080426: Swift-XRT refined analysis
  29. GRB080426: Swift/UVOT upper limits
  30. GRB 080426: Enhanced Swift-XRT position
  31. GRB 080426, Swift-BAT refined analysis
  32. GRB 080426: Swift detection of a possibly short burst
  33. Possible GRB 080315: XRT non-detection of afterglow
  34. GRB 080320 : Faulkes Telescope North Observations
  35. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  36. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  37. GRB080310, BVRcIc field calibration
  38. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  39. Swift XRT and UVOT observations of GRB080414
  40. GRB 080319B: Jet Break, Energetics, Supernova
  41. GRB 080413B: Faulkes Telescope South optical afterglow observations
  42. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  43. GRB 080413A: Suzaku WAM observation of the prompt emission
  44. GRB 080413B: Suzaku WAM observation of the prompt emission
  45. GRB 080414: RTT150 optical observations
  46. GRB 080414: A long GRB detected by INTEGRAL
  47. VLA radio observations of GRB 080413B
  48. VLA radio observations of GRB 080413A
  49. GRB 080413B: Ep,i-Eiso correlation
  50. GRB080413B
  51. Swift-BAT spectral lag analysis of GRB 080413B
  52. GRB 080413a, SMARTS optical/IR afterglow observations
  53. GRB080413A: Swift/UVOT observations
  54. GRB 080413B, Swift-BAT refined analysis
  55. GRB 080413A: Swift-XRT refined analysis
  56. GRB 080413A, Swift-BAT refined analysis
  57. GRB 080413A Bootes observation
  58. GRB080413B: REM NIR & Optical Observation
  59. GRB 080413B: GROND detection of afterglow in all bands
  60. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  61. GRB 080413A: REM detection of the NIR Afterglow
  62. GRB 080413: Enhanced Swift-XRT position
  63. GRB 080413: TAROT Calern observatory optical observations
  64. GRB 080413: Swift detection of a burst with an optical afterglow
  65. GRB 080413: ROTSE-III Detection of Optical Counterpart
  66. GRB 080411: Swift/UVOT refined analysis
  67. GRB 080411, Swift-BAT refined analysis
  68. GRB 080411: Swift-XRT Refined Analysis
  69. GRB 080411: Enhanced Swift-XRT position
  70. GRB 080411: GROND detection of optical afterglow candidate
  71. GRB 080411: Swift detection of a bright burst
  72. GRB 080409: Swift-BAT refined analysis
  73. GRB 080408: GROND detection of optical/NIR afterglow candidate
  74. GRB 080330 optical observations
  75. Swift/UVOT observations of GRB080409
  76. GRB 080409: Swift XRT refined analysis
  77. GRB 080408: Swift-XRT position of a possible afterglow
  78. GRB 080409: Enhanced Swift-XRT position
  79. GRB 080409: REM optical/NIR observations
  80. GRB 080409: Swift detection of a burst
  81. GRB 080408: Analysis of AGILE Gamma-ray data
  82. GRB 080408: GRB Localization by SuperAGILE
  83. GRB 080319A: Early RAPTOR optical limits
  84. GRB 080319B: HST observations
  85. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  86. GRB 080405: Swift-BAT refined analysis
  87. GRB 080405: Swift-XRT position
  88. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  89. GRB 080325: optical upper limit
  90. GRB 080328: GAO 150cm telescope Optical Observation
  91. GRB080330: Improved Swift XRT Position
  92. GRB080330: optical observations
  93. GRB080328, RIMOTS optical upper limit
  94. GRB080330: Swift XRT refined analysis
  95. GRB 080330: REM optical observations
  96. GRB 080330 Swift-UVOT refined analysis
  97. GRB 080328: Suzaku WAM observation of the prompt emission
  98. GRB080330: TNT optical observations
  99. GRB 080330, Swift-BAT refined analysis
  100. Konus-Wind observation of GRB 080328

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