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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"

28066 results found.

  1. GRB080514: REM NIR & Optical Observations
  2. GRB 080319B: Further HST observations and underlying host
  3. GRB 080506: NAYUTA Optical Observation
  4. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  5. GRB 080507: Keck photometry
  6. GRB 080507: E Pur Si Muove!
  7. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  8. GRB 080503: Hubble Space Telescope Imaging
  9. GRB080507: Swift/UVOT followup observations
  10. GRB 080507: Optical Afterglow
  11. GRB 080507: Swift-XRT position of a possible afterglow
  12. GRB 080506: VLA radio upper limit
  13. GRB 080507: GRB localization by SuperAGILE
  14. GRB 080506: TLS 2nd Epoch - possible light curve break
  15. GRB 080506: Swift XRT refined analysis
  16. GRB080506: Swift/UVOT observations
  17. GRB 080506: TLS afterglow detection in VRIZ
  18. GRB 080506: Enhanced Swift-XRT position
  19. GRB 080506: Swift detection of a burst with optical afterglow
  20. GRB 080503: VLA radio upper limit
  21. GRB 080503: Slow-rise optical AG ?
  22. GRB 080430: TLS imaging one day after the GRB
  23. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  24. GRB 080503: MITSuME Ishigakijima optical upper limits
  25. GRB080503: Swift/UVOT Upper Limits
  26. GRB080503 XRT refined analysis
  27. GRB 080430
  28. GRB 080430
  29. GRB 080503: Enhanced Swift-XRT position
  30. GRB 080503: MITSuME Akeno optical upper limits
  31. GRB 080503: New candidate afterglow/host in Gemini imaging
  32. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  33. GRB 080503: Swift detection of a short burst
  34. GRB 080411: Continued Swift Monitoring
  35. GRB 080430: Shallow decay
  36. GRB080430: RTT150 Optical Observations
  37. GRB080430: Swift/UVOT observations
  38. VLA radio upper limit on GRB 080430
  39. GRB 080430 - multicolor observations of the afterglow
  40. GRB 080430 optical observations
  41. GRB080430: optical observations
  42. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  43. GRB 080430: Swift-XRT refined analysis
  44. GRB 080430: Enhanced Swift-XRT position
  45. GRB 080430: Swift detection of a burst with optical afterglow
  46. GRB080426: Observations from CAHA
  47. GRB 080426: Swift-XRT refined analysis
  48. GRB080426: Swift/UVOT upper limits
  49. GRB 080426: Enhanced Swift-XRT position
  50. GRB 080426: Swift detection of a possibly short burst
  51. Possible GRB 080315: XRT non-detection of afterglow
  52. GRB 080320 : Faulkes Telescope North Observations
  53. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  54. GRB 080420?: Swift detection of a possible short burst
  55. GRB 080413B: Rapid PROMPT Observations
  56. Swift XRT and UVOT observations of GRB080414
  57. GRB 080319B: Jet Break, Energetics, Supernova
  58. GRB 080413B: Faulkes Telescope South optical afterglow observations
  59. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  60. GRB 080413A: MOA-II optical afterglow observations
  61. GRB 080319B: Continued Gemini-N monitoring
  62. VLA radio observations of GRB 080413B
  63. VLA radio observations of GRB 080413A
  64. GRB080413B
  65. GRB 080413a, SMARTS optical/IR afterglow observations
  66. GRB 080413B: Swift XRT refined analysis
  67. GRB080413A: Swift/UVOT observations
  68. GRB 080413A: Swift-XRT refined analysis
  69. GRB 080413A: VLT/UVES redshift
  70. GRB 080413B: VLT redshift
  71. GRB080413B: REM NIR & Optical Observation
  72. GRB 080413B: GROND detection of afterglow in all bands
  73. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  74. GRB 080413A: REM detection of the NIR Afterglow
  75. GRB 080413: Enhanced Swift-XRT position
  76. GRB 080413: Swift detection of a burst with an optical afterglow
  77. GRB 080413: ROTSE-III Detection of Optical Counterpart
  78. GRB 080411: Swift/UVOT refined analysis
  79. GRB 080411: Swift-XRT Refined Analysis
  80. GRB 080411: Enhanced Swift-XRT position
  81. GRB 080411: VLT redshift
  82. GRB 080411: GROND detection of optical afterglow candidate
  83. GRB 080411: Swift detection of a bright burst
  84. GRB 080330: Swift-XRT refined position retraction
  85. GRB 080408: GROND detection of optical/NIR afterglow candidate
  86. GRB 080330 optical observations
  87. Swift/UVOT observations of GRB080409
  88. GRB 080409: Swift XRT refined analysis
  89. UVOT/Swift Observations of GRB080408
  90. GRB 080408: Swift-XRT position of a possible afterglow
  91. GRB 080409: Enhanced Swift-XRT position
  92. GRB 080409: REM optical/NIR observations
  93. GRB 080409: Swift detection of a burst
  94. GRB 080319B: HST observations
  95. GRB 080330: RAPTOR detection of prompt optical flash
  96. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  97. GRB 080405: Swift-XRT position
  98. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  99. GRB 080325: optical upper limit
  100. GRB080330: Improved Swift XRT Position

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