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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"

18334 results found.

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

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