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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

21043 results found.

  1. GRB 080613B: GROND Upper Limits
  2. GRB 080613B - NOT optical and IR nondetections
  3. GRB080613B: Swift/UVOT Upper Limits
  4. GRB 080613: Faulkes Telescope North optical candidate
  5. GRB 080603A: Late-time Keck imaging and spectroscopy
  6. Swift observations of BAT Slew Survey event (Trigger=010)
  7. GRB 080603A: final Swift-XRT observations.
  8. GRB080607: RTT150 optical observations
  9. GRB 080603A: optical observations
  10. GRB 080607: Swift-XRT refined analysis
  11. Swift/UVOT Observations of GRB080607
  12. GRB 080605: optical observations
  13. GRB 080607 KAIT observations
  14. GRB 080605: GROND 2nd epoch observations
  15. GRB 080607 - PAIRITEL NIR detection
  16. GRB 080607: Keck/LRIS spectroscopy and redshift
  17. GRB 080607: Super-LOTIS early observations
  18. GRB 080607: ROTSE-III Detection of Optical Counterpart
  19. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  20. GRB 080605: Swift-UVOT refined analysis
  21. GRB 080605: Swift-XRT refined analysis
  22. GRB080605: observation by BOOTES
  23. GRB 080605: GROND detection of the optical afterglow candidate
  24. GRB080605: optical observations
  25. GRB 080604: Xinglong R band observation
  26. GRB 080603A: Xinglong R band observation
  27. GRB 080603B: TLS Afterglow Observation
  28. GRB 080603A: TLS Afterglow Observation
  29. Swift/UVOT observations of GRB080604
  30. GRB 080604: Gemini-North spectroscopy
  31. GRB 080603B : Xinglong EST observations
  32. GRB 080603B : Liverpool Telescope Observations
  33. GRB 080603A: Swift-XRT detection of the afterglow
  34. GRB 080430: optical observations
  35. GRB 080603B: Swift/UVOT detection of the afterglow
  36. GRB 080603A: Swift/UVOT detection of the afterglow
  37. GRB080603B: RTT150 optical observations, break in light curves
  38. GRB 080604: Early Super-LOTIS Observations
  39. GRB 080516: TAROT La Silla observatory optical observations
  40. GRB 080603B: BOOTES2/TELMA optical observations
  41. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  42. GRB080603: Super-LOTIS detection of Optical Counterpart
  43. GRB 080603: Gemini-North redshift
  44. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  45. GRB 080602: Swift-XRT refined analysis
  46. GRB 080602: NOT R-band upper limit
  47. GRB 080523: afterglow confirmation and redshift constraints
  48. GRB 080524: Swift XRT and UVOT analysis
  49. GRB 080503: 2nd Epoch Chandra X-ray Observations
  50. GRB 080523: VLT optical observations
  51. Swift/UVOT observations of GRB 080523
  52. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  53. GRB 80516: Swift/UVOT Observations
  54. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  55. GRB 080514B: UVOT Observations
  56. GRB080520: Swift/UVOT observations
  57. GRB 080520: VLT redshift
  58. GRB 080520, GROND observations
  59. GRB 080514B: Further NIR observations
  60. GRB080517: Liverpool Telescope Optical Observations
  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 080514B: NOT observations
  66. GRB 080514B : redshift estimation
  67. GRB 080514B: KPNO 4m IR observations
  68. GRB 080514B: slow fading behaviour ?
  69. GRB 080514B, GROND observations
  70. GRB 080514B: Afterglow candidate
  71. GRB 080514B: Watcher observations
  72. GRB 080514B: possible AGILE detection at E>50 MeV
  73. GRB 080514B: SuperAGILE/IPN GRB Localization
  74. GRB080514: REM NIR & Optical Observations
  75. GRB 080319B: Further HST observations and underlying host
  76. GRB 080507: Keck photometry
  77. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  78. GRB 080503: Hubble Space Telescope Imaging
  79. GRB080507: Swift/UVOT followup observations
  80. GRB 080506:Optical observations from HCT
  81. GRB 080503: Fading in continued Gemini imaging
  82. GRB080506: Swift/UVOT observations
  83. GRB 080506: Observations from NOT
  84. GRB 080506: Optical observation with KANATA/TRISPEC
  85. GRB 080503: VLA radio upper limit
  86. GRB 080503: Observations from NOT
  87. GRB 080430: TLS imaging one day after the GRB
  88. GRB 080503: No further optical rebrightening
  89. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  90. GRB080503: Swift/UVOT Upper Limits
  91. GRB 080430
  92. GRB 080430
  93. GRB 080430
  94. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  95. GRB 080411: Continued Swift Monitoring
  96. GRB 080430: Optical observations
  97. GRB 080430: Shallow decay
  98. GRB080430: RTT150 Optical Observations
  99. GRB080430: Swift/UVOT observations
  100. GRB 080430 - multicolor observations of the afterglow

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