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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"

32495 results found.

  1. GRB 080516, GROND further analysis
  2. GRB 080517: Swift-XRT refined analysis
  3. GRB 080514B: Further NIR observations
  4. GRB080517: Liverpool Telescope Optical Observations
  5. GRB 080516, GROND 2nd epoch observations
  6. GRB 080516, GROND observations
  7. GRB080430: optical observations
  8. GRB 080516, SMARTS optical/IR observations
  9. GRB 080516: Swift-XRT Team refined analysis
  10. GRB 080516, Swift-BAT refined analysis
  11. GRB 080514B: NOT observations
  12. Errartum: VLA upper limit on GRB 080507
  13. VLA upper limit on GRB 080705
  14. GRB 080514B : redshift estimation
  15. Konus-Wind observation of GRB 080513
  16. Swift-BAT refined analysis for Trigger 311603: Galactic source
  17. GRB 080515, Swift-BAT refined analysis
  18. GRB 080514B: KPNO 4m IR observations
  19. GRB 080514B: slow fading behaviour ?
  20. GRB 080514B: Swift-XRT analysis
  21. GRB 080514B, GROND observations
  22. GRB 080514B: Finding chart
  23. GRB 080514B: Afterglow candidate
  24. GRB 080514B: Watcher observations
  25. GRB 080514B: possible AGILE detection at E>50 MeV
  26. procesure for GRB Circular
  27. Konus-Wind observation of GRB 080507
  28. GRB 080506: NAYUTA Optical Observation
  29. GRB 080507: Suzaku WAM observation of the prompt emission
  30. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  31. GRB 080507: Keck photometry
  32. GRB 080507: E Pur Si Muove!
  33. GRB 080503: Hubble Space Telescope Imaging
  34. GRB080507: Swift/UVOT followup observations
  35. GRB 080507: Optical Afterglow
  36. GRB 080506:Optical observations from HCT
  37. GRB 080507: Swift-XRT position of a possible afterglow
  38. GRB 080506: VLA radio upper limit
  39. GRB 080506: TLS 2nd Epoch - possible light curve break
  40. GRB 080503: Fading in continued Gemini imaging
  41. GRB 080506: Swift XRT refined analysis
  42. GRB080506: Swift/UVOT observations
  43. GRB 080506, Swift-BAT refined analysis
  44. GRB080503, RIMOTS optical upper limit
  45. GRB 080506: Observations from NOT
  46. GRB 080506: optical observation from Ondrejov
  47. GRB 080506: TLS afterglow detection in VRIZ
  48. GRB 080506: Optical observation with KANATA/TRISPEC
  49. GRB 080503: VLA radio upper limit
  50. GRB 080503: Observations from NOT
  51. GRB 080503: Slow-rise optical AG ?
  52. GRB 080430: TLS imaging one day after the GRB
  53. GRB 080503: No further optical rebrightening
  54. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  55. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  56. GRB 080503: MITSuME Ishigakijima optical upper limits
  57. GRB080503: Swift/UVOT Upper Limits
  58. GRB080503 XRT refined analysis
  59. GRB 080503, Swift-BAT refined analysis
  60. GRB 080430
  61. GRB 080430
  62. GRB 080503: MITSuME Akeno optical upper limits
  63. GRB 080503: New candidate afterglow/host in Gemini imaging
  64. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  65. GRB 080411: Continued Swift Monitoring
  66. GRB 080430: Optical observations
  67. GRB 080430: Shallow decay
  68. GRB080430: RTT150 Optical Observations
  69. GRB080430: Swift/UVOT observations
  70. VLA radio upper limit on GRB 080430
  71. GRB 080430 - multicolor observations of the afterglow
  72. GRB 080430 optical observations
  73. GRB 080430, Swift-BAT refined analysis
  74. GRB080430: optical observations
  75. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  76. GRB 080430: Swift-XRT refined analysis
  77. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  78. GRB080426: Observations from CAHA
  79. GRB 080426: Swift-XRT refined analysis
  80. GRB080426: Swift/UVOT upper limits
  81. GRB 080426, Swift-BAT refined analysis
  82. Possible GRB 080315: XRT non-detection of afterglow
  83. GRB 080320 : Faulkes Telescope North Observations
  84. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  85. GRB080319A: MAGIC telescope GeV observation
  86. Swift-BAT trigger 309665 is not a GRB
  87. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  88. GRB 080420?: Swift detection of a possible short burst
  89. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  90. GRB 080413B: Rapid PROMPT Observations
  91. Swift XRT and UVOT observations of GRB080414
  92. GRB 080319B: Jet Break, Energetics, Supernova
  93. GRB 080413B: Faulkes Telescope South optical afterglow observations
  94. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  95. GRB 080413A: Suzaku WAM observation of the prompt emission
  96. GRB 080413B: Suzaku WAM observation of the prompt emission
  97. GRB 080413A: MOA-II optical afterglow observations
  98. GRB 080319B: Continued Gemini-N monitoring
  99. GRB 080414: RTT150 optical observations
  100. GRB 080414 Watcher observations

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