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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"

21263 results found.

  1. GRB 080503: Swift detection of a short burst
  2. GRB080430: Swift/UVOT observations
  3. VLA radio upper limit on GRB 080430
  4. GRB 080430: Swift-XRT refined analysis
  5. GRB 080430: Enhanced Swift-XRT position
  6. GRB 080430 - SDSS Pre-Burst Observations
  7. GRB 080430: Swift detection of a burst with optical afterglow
  8. GRB 080430: TAROT Calern observatory optical observations
  9. GRB080426: Swift/UVOT upper limits
  10. GRB 080426: Enhanced Swift-XRT position
  11. GRB 080426: Swift detection of a possibly short burst
  12. GRB 080320 : Faulkes Telescope North Observations
  13. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  14. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  15. GRB080310, BVRcIc field calibration
  16. Swift XRT and UVOT observations of GRB080414
  17. GRB 080319B: Jet Break, Energetics, Supernova
  18. GRB 080413B: Faulkes Telescope South optical afterglow observations
  19. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  20. GRB 080413A: Suzaku WAM observation of the prompt emission
  21. GRB 080413B: Suzaku WAM observation of the prompt emission
  22. GRB 080413A: MOA-II optical afterglow observations
  23. GRB 080414: RTT150 optical observations
  24. VLA radio observations of GRB 080413B
  25. GRB 080413B: Gemini-South Spectroscopy
  26. VLA radio observations of GRB 080413A
  27. GRB080413B
  28. GRB 080413a, SMARTS optical/IR afterglow observations
  29. GRB080413A: Swift/UVOT observations
  30. GRB080413B: REM NIR & Optical Observation
  31. GRB 080413B: GROND detection of afterglow in all bands
  32. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  33. GRB 080413A: REM detection of the NIR Afterglow
  34. GRB 080413: Enhanced Swift-XRT position
  35. GRB 080413: TAROT Calern observatory optical observations
  36. GRB 080413: Swift detection of a burst with an optical afterglow
  37. GRB 080411: Swift/UVOT refined analysis
  38. GRB 080411, Swift-BAT refined analysis
  39. GRB 080411: Swift-XRT Refined Analysis
  40. Konus-Wind observation of GRB 080411
  41. GRB 080411: Enhanced Swift-XRT position
  42. GRB 080411: GROND detection of optical afterglow candidate
  43. GRB 080411: Swift detection of a bright burst
  44. GRB 080408: GROND detection of optical/NIR afterglow candidate
  45. GRB 080330 optical observations
  46. Swift/UVOT observations of GRB080409
  47. GRB 080409: Swift XRT refined analysis
  48. GRB 080409: Enhanced Swift-XRT position
  49. GRB 080409: REM optical/NIR observations
  50. GRB 080409: Swift detection of a burst
  51. GRB 080319A: Early RAPTOR optical limits
  52. GRB 080319B: HST observations
  53. GRB 080330: RAPTOR detection of prompt optical flash
  54. GRB 080405: Swift-BAT refined analysis
  55. GRB 080405: Swift-XRT position
  56. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  57. GRB 080325: optical upper limit
  58. GRB 080328: GAO 150cm telescope Optical Observation
  59. GRB080330: Improved Swift XRT Position
  60. GRB080328, RIMOTS optical upper limit
  61. GRB 080330: REM optical observations
  62. GRB 080330 Swift-UVOT refined analysis
  63. GRB 080328: Suzaku WAM observation of the prompt emission
  64. GRB080330: TNT optical observations
  65. Konus-Wind observation of GRB 080328
  66. GRB 080330: GROND Observations
  67. GRB 080330: TAROT Calern observatory optical observations
  68. GRB 080330A: PAIRITEL Infrared Detections
  69. GRB 080330: error in reported XRT position
  70. GRB080330 - SDSS Pre-Burst Observations
  71. GRB 080330: Swift detection of a burst with an optical counterpart
  72. GRB 080330: TAROT Calern observatory optical detection
  73. Swift/UVOT observations of GRB080328
  74. GRB080319B, BVRcIc field calibration
  75. GRB 080328: Enhanced Swift-XRT position
  76. GRB 080328: Swift detection of a burst with an optical counterpart
  77. GRB 080325: Subaru detection of NIR afterglow candidate
  78. GRB 080325: GROND Observations
  79. GRB 080325: Swift/UVOT Upper Limits
  80. GRB 080325: Early observations from OSN
  81. GRB 080325: NIR afterglow candidate
  82. GRB 080319D: GROND Detection of the Optical Counterpart
  83. GRB 080325: Enhanced Swift-XRT position
  84. GRB 080325: Swift detection of a burst
  85. GRB 080319B: Spitzer Mid-infrared Observations
  86. GRB 080319C: Suzaku WAM observation of the prompt emission
  87. Radio Detection of GRB 080319B
  88. GRB 080320, Swift-BAT refined analysis
  89. GRB 080319D: GROND Observations
  90. GRB 080319B: TORTORA light curve
  91. GRB 080319B: optical upper limit
  92. GRB 080319D: optical upper limit
  93. GRB 080319C: UVOT Observations
  94. GRB 080319B: UVOT Observations
  95. GRB 080319A: UVOT Observations
  96. GRB 080320: Swift XRT refined analysis
  97. GRB 080320: Early Super-LOTIS Observations
  98. GRB 080320: J detection with FLAMINGOS
  99. GRB 080319D: Swift XRT refined analysis
  100. GRB 080320: optical limit

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