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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"

15560 results found.

  1. GRB 080613A: Swift-XRT detection of the afterglow
  2. GRB080613A: Swift/UVOT Upper Limits
  3. GRB 080613B - NOT optical and IR nondetections
  4. GRB080613B: Swift/UVOT Upper Limits
  5. GRB 080613: Faulkes Telescope North optical candidate
  6. GRB 080603A: Late-time Keck imaging and spectroscopy
  7. GRB 080603b: optical observation
  8. GRB080605: optical observation with the MITSuME-OAO telescope
  9. GRB080607: RTT150 optical observations
  10. GRB 080603A: optical observations
  11. Swift/UVOT Observations of GRB080607
  12. GRB 080605: optical observations
  13. GRB 080607 KAIT observations
  14. VLA detection of INTEGRAL burst GRB 080603A
  15. GRB 080605: GROND 2nd epoch observations
  16. GRB 080607 - PAIRITEL NIR detection
  17. GRB 080607: Keck/LRIS spectroscopy and redshift
  18. GRB 080607: Swift detection of a burst with optical afterglow
  19. GRB 080607: ROTSE-III Detection of Optical Counterpart
  20. GRB 080605: Swift-UVOT refined analysis
  21. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  22. GRB080605: observation by BOOTES
  23. GRB 080605: GROND detection of the optical afterglow candidate
  24. GRB080605: optical observations
  25. GRB 080605: VLT redshift
  26. GRB 080605: Liverpool Telescope optical afterglow candidate
  27. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  28. GRB 080605: Swift detection of a burst with an optical afterglow
  29. GRB 080603B: PAIRITEL infrared detection
  30. GRB 080603A: PAIRITEL infrared detection
  31. Swift/UVOT observations of GRB080604
  32. GRB 080604: Gemini-North spectroscopy
  33. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  34. GRB 080603B : Liverpool Telescope Observations
  35. GRB 080430: optical observations
  36. GRB 080603B: Swift/UVOT detection of the afterglow
  37. GRB 080604: Hobby-Eberly Telescope spectroscopy
  38. GRB 080603A: Swift/UVOT detection of the afterglow
  39. GRB080603B: RTT150 optical observations, break in light curves
  40. GRB080604: confirmation of optical afterglow
  41. GRB 080604: Swift detection of a burst with an optical afterglow
  42. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  43. GRB 080516: TAROT La Silla observatory optical observations
  44. GRB 080603B: BOOTES2/TELMA optical observations
  45. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  46. GRB 080603B: Swift detection of a burst with optical afterglow
  47. GRB080603: Super-LOTIS detection of Optical Counterpart
  48. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  49. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  50. GRB 080523: afterglow confirmation and redshift constraints
  51. GRB 080503: 2nd Epoch Chandra X-ray Observations
  52. GRB 080523: VLT optical observations
  53. Swift/UVOT observations of GRB 080523
  54. GRB 80516: Swift/UVOT Observations
  55. GRB 080514B: UVOT Observations
  56. GRB 080520: VLT redshift
  57. GRB 080520: Swift detection of a burst with optical afterglow
  58. GRB080517: Liverpool Telescope Optical Observations
  59. GRB 080517: Swift detection of a burst
  60. GRB080430: optical observations
  61. GRB 080516, SMARTS optical/IR observations
  62. GRB 080514B: Finding chart
  63. GRB080514: REM NIR & Optical Observations
  64. GRB 080506: NAYUTA Optical Observation
  65. GRB 080507: Keck photometry
  66. GRB 080507: E Pur Si Muove!
  67. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  68. GRB 080503: Hubble Space Telescope Imaging
  69. GRB080507: Swift/UVOT followup observations
  70. GRB 080507: Optical Afterglow
  71. GRB 080506:Optical observations from HCT
  72. GRB 080503: Fading in continued Gemini imaging
  73. GRB080503, RIMOTS optical upper limit
  74. GRB 080506: optical observation from Ondrejov
  75. GRB 080506: Optical observation with KANATA/TRISPEC
  76. GRB 080506: Swift detection of a burst with optical afterglow
  77. GRB 080503: Slow-rise optical AG ?
  78. GRB 080503: No further optical rebrightening
  79. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  80. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  81. GRB 080503: MITSuME Ishigakijima optical upper limits
  82. GRB080503: Swift/UVOT Upper Limits
  83. GRB 080503: MITSuME Akeno optical upper limits
  84. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  85. GRB 080411: Continued Swift Monitoring
  86. GRB 080430: Optical observations
  87. GRB080430: RTT150 Optical Observations
  88. GRB 080430 optical observations
  89. GRB080430: optical observations
  90. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  91. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  92. GRB 080430: Bootes observation
  93. GRB 080430: Swift detection of a burst with optical afterglow
  94. GRB 080430: TAROT Calern observatory optical observations
  95. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  96. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  97. Swift XRT and UVOT observations of GRB080414
  98. GRB 080319B: Jet Break, Energetics, Supernova
  99. GRB 080413B: Faulkes Telescope South optical afterglow observations
  100. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations

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