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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"

28056 results found.

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

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