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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"

32511 results found.

  1. GRB 080523: VLT optical observations
  2. Swift/UVOT observations of GRB 080523
  3. GRB 080515: KPNO 4m NIR afterglow detection
  4. GRB 80516: Swift/UVOT Observations
  5. GRB 080515: Swift-XRT position and analysis
  6. GRB 080520, Swift-BAT refined analysis
  7. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  8. GRB 080514B: UVOT Observations
  9. GRB080520: Swift/UVOT observations
  10. GRB 080520: VLT redshift
  11. GRB 080520, GROND observations
  12. GRB 080520: Swift XRT Refined Analysis
  13. Konus-Wind observation of GRB 080514B
  14. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  15. GRB 080503: Further HST imaging
  16. GRB 080517, Swift-BAT refined analysis
  17. GRB 080516, GROND further analysis
  18. GRB 080517: Swift-XRT refined analysis
  19. GRB 080514B: Further NIR observations
  20. GRB080517: Liverpool Telescope Optical Observations
  21. GRB 080516, GROND 2nd epoch observations
  22. GRB 080516, GROND observations
  23. GRB080430: optical observations
  24. GRB 080516, SMARTS optical/IR observations
  25. GRB 080516: Swift-XRT Team refined analysis
  26. GRB 080516, Swift-BAT refined analysis
  27. GRB 080514B: NOT observations
  28. Errartum: VLA upper limit on GRB 080507
  29. VLA upper limit on GRB 080705
  30. GRB 080514B : redshift estimation
  31. Konus-Wind observation of GRB 080513
  32. Swift-BAT refined analysis for Trigger 311603: Galactic source
  33. GRB 080515, Swift-BAT refined analysis
  34. GRB 080514B: KPNO 4m IR observations
  35. GRB 080514B: slow fading behaviour ?
  36. GRB 080514B: Swift-XRT analysis
  37. GRB 080514B, GROND observations
  38. GRB 080514B: Finding chart
  39. GRB 080514B: Afterglow candidate
  40. GRB 080514B: Watcher observations
  41. GRB 080514B: possible AGILE detection at E>50 MeV
  42. procesure for GRB Circular
  43. Konus-Wind observation of GRB 080507
  44. GRB 080506: NAYUTA Optical Observation
  45. GRB 080507: Suzaku WAM observation of the prompt emission
  46. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  47. GRB 080507: Keck photometry
  48. GRB 080507: E Pur Si Muove!
  49. GRB 080503: Hubble Space Telescope Imaging
  50. GRB080507: Swift/UVOT followup observations
  51. GRB 080507: Optical Afterglow
  52. GRB 080506:Optical observations from HCT
  53. GRB 080507: Swift-XRT position of a possible afterglow
  54. GRB 080506: VLA radio upper limit
  55. GRB 080506: TLS 2nd Epoch - possible light curve break
  56. GRB 080503: Fading in continued Gemini imaging
  57. GRB 080506: Swift XRT refined analysis
  58. GRB080506: Swift/UVOT observations
  59. GRB 080506, Swift-BAT refined analysis
  60. GRB080503, RIMOTS optical upper limit
  61. GRB 080506: Observations from NOT
  62. GRB 080506: optical observation from Ondrejov
  63. GRB 080506: TLS afterglow detection in VRIZ
  64. GRB 080506: Optical observation with KANATA/TRISPEC
  65. GRB 080503: VLA radio upper limit
  66. GRB 080503: Observations from NOT
  67. GRB 080503: Slow-rise optical AG ?
  68. GRB 080430: TLS imaging one day after the GRB
  69. GRB 080503: No further optical rebrightening
  70. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  71. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  72. GRB 080503: MITSuME Ishigakijima optical upper limits
  73. GRB080503: Swift/UVOT Upper Limits
  74. GRB080503 XRT refined analysis
  75. GRB 080503, Swift-BAT refined analysis
  76. GRB 080430
  77. GRB 080430
  78. GRB 080503: MITSuME Akeno optical upper limits
  79. GRB 080503: New candidate afterglow/host in Gemini imaging
  80. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  81. GRB 080411: Continued Swift Monitoring
  82. GRB 080430: Optical observations
  83. GRB 080430: Shallow decay
  84. GRB080430: RTT150 Optical Observations
  85. GRB080430: Swift/UVOT observations
  86. VLA radio upper limit on GRB 080430
  87. GRB 080430 - multicolor observations of the afterglow
  88. GRB 080430 optical observations
  89. GRB 080430, Swift-BAT refined analysis
  90. GRB080430: optical observations
  91. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  92. GRB 080430: Swift-XRT refined analysis
  93. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  94. GRB080426: Observations from CAHA
  95. GRB 080426: Swift-XRT refined analysis
  96. GRB080426: Swift/UVOT upper limits
  97. GRB 080426, Swift-BAT refined analysis
  98. Possible GRB 080315: XRT non-detection of afterglow
  99. GRB 080320 : Faulkes Telescope North Observations
  100. GRB 080319A : Liverpool and Faulkes Telescopes Observations

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