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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

38396 results found.

  1. GRB 080603B : Xinglong EST observations
  2. GRB 080603B : Liverpool Telescope Observations
  3. Konus-Wind observation of GRB 080603B
  4. GRB 080603B: Swift-XRT refined analysis
  5. GRB 080603A: Swift-XRT detection of the afterglow
  6. GRB 080603B: Swift/UVOT detection of the afterglow
  7. GRB 080604: Enhanced Swift-XRT position
  8. GRB 080604: Hobby-Eberly Telescope spectroscopy
  9. GRB 080603A: Swift/UVOT detection of the afterglow
  10. GRB080603B: RTT150 optical observations, break in light curves
  11. GRB 080604: Early Super-LOTIS Observations
  12. GRB 080604: Swift detection of a burst with an optical afterglow
  13. GRB080603B: NOT redshift
  14. GRB 080603B: BOOTES2/TELMA optical observations
  15. GRB 080603B: Swift detection of a burst with optical afterglow
  16. GRB080603: Super-LOTIS detection of Optical Counterpart
  17. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  18. GRB 080603: Gemini-North redshift
  19. GRB 080603: A long GRB detected by INTEGRAL
  20. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  21. GRB 080602: Swift-XRT refined analysis
  22. Konus-Wind observation of GRB 080602
  23. GRB 080602: NOT R-band upper limit
  24. GRB 080602: Enhanced Swift-XRT position
  25. GRB 080602: Swift detection of a burst
  26. Swift analysis of BAT Slew Survey event (Trigger=009)
  27. GRB 080523: afterglow confirmation and redshift constraints
  28. Konus-Wind observation of reactivation of SGR 1627-41
  29. Reactivation of SGR 1627-41
  30. GRB 080524: Swift XRT and UVOT analysis
  31. GRB 080524: Swift-BAT detection of a burst in ground analysis
  32. GRB 080523: Swift-XRT refined analysis
  33. GRB 080523, Swift-BAT refined analysis
  34. GRB 080520: VLT host detection
  35. GRB 080523: VLT optical observations
  36. Swift/UVOT observations of GRB 080523
  37. GRB 080523: Enhanced Swift-XRT position
  38. GRB 080523: Swift detection of a burst
  39. GRB 080515: NIR magnitude correction
  40. GRB 080515: KPNO 4m NIR afterglow detection
  41. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  42. GRB 80516: Swift/UVOT Observations
  43. GRB 080515: Swift-XRT position and analysis
  44. GRB 080514B: UVOT Observations
  45. GRB080520: Swift/UVOT observations
  46. GRB 080520: VLT redshift
  47. GRB 080520, GROND observations
  48. GRB 080520: Enhanced Swift-XRT position
  49. GRB 080520: Swift XRT Refined Analysis
  50. GRB 080520: Swift detection of a burst with optical afterglow
  51. GRB 080514B: Suzaku WAM observation of the prompt emission
  52. Konus-Wind observation of GRB 080514B
  53. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  54. GRB 080503: Further HST imaging
  55. GRB 080517, Swift-BAT refined analysis
  56. GRB 080516, GROND further analysis
  57. GRB 080517: Swift-XRT refined analysis
  58. GRB 080514B: Further NIR observations
  59. GRB 080517: Enhanced Swift-XRT position
  60. GRB 080517: Swift detection of a burst
  61. GRB 080516, GROND 2nd epoch observations
  62. GRB 080516, GROND observations
  63. GRB080430: optical observations
  64. GRB 080516, SMARTS optical/IR observations
  65. GRB 080516: Swift-XRT Team refined analysis
  66. GRB 080516: Enhanced Swift-XRT position
  67. GRB 080514B: NOT observations
  68. GRB 080516: Swift detection of a burst
  69. Errartum: VLA upper limit on GRB 080507
  70. VLA upper limit on GRB 080705
  71. GRB 080514B : redshift estimation
  72. Konus-Wind observation of GRB 080513
  73. IPN triangulation of bright GRB 080513
  74. Swift-BAT refined analysis for Trigger 311603: Galactic source
  75. GRB 080514B: KPNO 4m IR observations
  76. GRB 080514B: slow fading behaviour ?
  77. GRB 080514B: Swift-XRT analysis
  78. GRB 080514B, GROND observations
  79. GRB 080515: Swift detection of a burst
  80. GRB 080514B: Finding chart
  81. GRB 080514B: Afterglow candidate
  82. GRB 080514B: Watcher observations
  83. GRB 080514B: possible AGILE detection at E>50 MeV
  84. GRB 080514B: SuperAGILE/IPN GRB Localization
  85. Swift detection of a possible galactic transient
  86. GRB080514: REM NIR & Optical Observations
  87. Konus-Wind observation of GRB 080507
  88. GRB 080319B: Further HST observations and underlying host
  89. GRB 080506: NAYUTA Optical Observation
  90. GRB 080507: Suzaku WAM observation of the prompt emission
  91. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  92. GRB 080507: Keck photometry
  93. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  94. GRB080507: Swift/UVOT followup observations
  95. GRB 080506:Optical observations from HCT
  96. GRB 080507: Swift-XRT position of a possible afterglow
  97. GRB 080506: VLA radio upper limit
  98. GRB 080507: GRB localization by SuperAGILE
  99. GRB 080503: Fading in continued Gemini imaging
  100. GRB080506: Swift/UVOT observations

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