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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"

28058 results found.

  1. GRB 080605: Enhanced Swift-XRT position
  2. GRB 080605: GROND detection of the optical afterglow candidate
  3. GRB080605: optical observations
  4. GRB 080605: VLT redshift
  5. GRB 080605: Liverpool Telescope optical afterglow candidate
  6. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  7. GRB 080605: TLS RRM Afterglow
  8. GRB 080605: Swift detection of a burst with an optical afterglow
  9. GRB 080603B: PAIRITEL infrared detection
  10. GRB 080603A: PAIRITEL infrared detection
  11. GRB 080603B: TLS Afterglow Observation
  12. GRB 080603A: TLS Afterglow Observation
  13. Swift/UVOT observations of GRB080604
  14. GRB080604: HET redshift retraction
  15. GRB 080604: Gemini-North spectroscopy
  16. GRB 080604: Swift-XRT refined analysis
  17. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  18. GRB 080603B : Liverpool Telescope Observations
  19. GRB 080603B: Swift-XRT refined analysis
  20. GRB 080603A: Swift-XRT detection of the afterglow
  21. GRB 080603B: Swift/UVOT detection of the afterglow
  22. GRB 080604: Enhanced Swift-XRT position
  23. GRB 080604: Hobby-Eberly Telescope spectroscopy
  24. GRB 080603A: Swift/UVOT detection of the afterglow
  25. GRB080603B: RTT150 optical observations, break in light curves
  26. GRB 080604: Early Super-LOTIS Observations
  27. GRB080604: confirmation of optical afterglow
  28. GRB 080604: Swift detection of a burst with an optical afterglow
  29. GRB080603B: NOT redshift
  30. GRB 080603B: BOOTES2/TELMA optical observations
  31. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  32. GRB 080603B: Swift detection of a burst with optical afterglow
  33. GRB080603: Super-LOTIS detection of Optical Counterpart
  34. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  35. GRB 080603: Gemini-North redshift
  36. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  37. GRB 080602: Swift-XRT refined analysis
  38. GRB 080602: NOT R-band upper limit
  39. GRB 080602: Enhanced Swift-XRT position
  40. GRB 080602: Swift detection of a burst
  41. Swift analysis of BAT Slew Survey event (Trigger=009)
  42. GRB 080523: afterglow confirmation and redshift constraints
  43. Reactivation of SGR 1627-41
  44. GRB 080524: Swift XRT and UVOT analysis
  45. GRB 080503: 2nd Epoch Chandra X-ray Observations
  46. GRB 080524: Swift-BAT detection of a burst in ground analysis
  47. GRB 080523: Swift-XRT refined analysis
  48. GRB 080520: VLT host detection
  49. GRB 080523: VLT optical observations
  50. Swift/UVOT observations of GRB 080523
  51. GRB 080523: Enhanced Swift-XRT position
  52. GRB 080523: Swift detection of a burst
  53. GRB 080515: KPNO 4m NIR afterglow detection
  54. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  55. GRB 80516: Swift/UVOT Observations
  56. GRB 080515: Swift-XRT position and analysis
  57. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  58. GRB 080514B: UVOT Observations
  59. GRB080520: Swift/UVOT observations
  60. GRB 080520: VLT redshift
  61. GRB 080520, GROND observations
  62. GRB 080520: Enhanced Swift-XRT position
  63. GRB 080520: Swift XRT Refined Analysis
  64. GRB 080520: Swift detection of a burst with optical afterglow
  65. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  66. GRB 080503: Further HST imaging
  67. GRB 080516, GROND further analysis
  68. GRB 080517: Swift-XRT refined analysis
  69. GRB 080514B: Further NIR observations
  70. GRB 080517: Enhanced Swift-XRT position
  71. GRB080517: Liverpool Telescope Optical Observations
  72. GRB 080517: Swift detection of a burst
  73. GRB 080516, GROND 2nd epoch observations
  74. GRB 080516, GROND observations
  75. GRB080430: optical observations
  76. GRB 080516, SMARTS optical/IR observations
  77. GRB 080516: Swift-XRT Team refined analysis
  78. GRB 080516: Enhanced Swift-XRT position
  79. GRB 080514B: NOT observations
  80. GRB 080516: Swift detection of a burst
  81. Errartum: VLA upper limit on GRB 080507
  82. VLA upper limit on GRB 080705
  83. GRB 080514B : redshift estimation
  84. GRB 080514B: KPNO 4m IR observations
  85. GRB 080514B: slow fading behaviour ?
  86. GRB 080514B: Swift-XRT analysis
  87. GRB 080514B, GROND observations
  88. GRB 080515: Swift detection of a burst
  89. GRB 080514B: Afterglow candidate
  90. GRB 080430
  91. GRB 080514B: possible AGILE detection at E>50 MeV
  92. Swift detection of a possible galactic transient
  93. GRB080514: REM NIR & Optical Observations
  94. GRB 080319B: Further HST observations and underlying host
  95. GRB 080506: NAYUTA Optical Observation
  96. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  97. GRB 080507: Keck photometry
  98. GRB 080507: E Pur Si Muove!
  99. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  100. GRB 080503: Hubble Space Telescope Imaging

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