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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').

18051 results found.

  1. GRB 080603A: Swift-XRT detection of the afterglow
  2. GRB 080603B: Swift/UVOT detection of the afterglow
  3. GRB 080604: Enhanced Swift-XRT position
  4. GRB 080603B, Swift-BAT refined analysis
  5. GRB 080603A: Swift/UVOT detection of the afterglow
  6. GRB080603B: RTT150 optical observations, break in light curves
  7. GRB 080604: Early Super-LOTIS Observations
  8. GRB 080604: Swift detection of a burst with an optical afterglow
  9. GRB 080516: TAROT La Silla observatory optical observations
  10. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  11. GRB 080603B: Swift detection of a burst with optical afterglow
  12. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  13. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  14. GRB 080602, Swift-BAT refined analysis
  15. GRB 080602: Swift-XRT refined analysis
  16. Konus-Wind observation of GRB 080602
  17. GRB 080602: Enhanced Swift-XRT position
  18. GRB 080602: Swift detection of a burst
  19. Swift analysis of BAT Slew Survey event (Trigger=009)
  20. Konus-Wind observation of reactivation of SGR 1627-41
  21. Reactivation of SGR 1627-41
  22. GRB 080524: Swift XRT and UVOT analysis
  23. GRB 080524: Swift-BAT detection of a burst in ground analysis
  24. GRB 080523: Swift-XRT refined analysis
  25. GRB 080523, Swift-BAT refined analysis
  26. Swift/UVOT observations of GRB 080523
  27. GRB 080523: Enhanced Swift-XRT position
  28. GRB 080523: Swift detection of a burst
  29. GRB 80516: Swift/UVOT Observations
  30. GRB 080515: Swift-XRT position and analysis
  31. GRB 080520, Swift-BAT refined analysis
  32. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  33. GRB 080514B: UVOT Observations
  34. GRB080520: Swift/UVOT observations
  35. GRB 080520, GROND observations
  36. GRB 080520: Enhanced Swift-XRT position
  37. GRB 080520: Swift XRT Refined Analysis
  38. GRB 080520: Swift detection of a burst with optical afterglow
  39. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  40. GRB 080517, Swift-BAT refined analysis
  41. GRB 080517: Swift-XRT refined analysis
  42. GRB 080517: Enhanced Swift-XRT position
  43. GRB 080517: Swift detection of a burst
  44. GRB 080516, SMARTS optical/IR observations
  45. GRB 080516: Swift-XRT Team refined analysis
  46. GRB 080516, Swift-BAT refined analysis
  47. GRB 080516: Enhanced Swift-XRT position
  48. GRB 080516: Swift detection of a burst
  49. Errartum: VLA upper limit on GRB 080507
  50. VLA upper limit on GRB 080705
  51. IPN triangulation of bright GRB 080513
  52. Swift-BAT refined analysis for Trigger 311603: Galactic source
  53. GRB 080515, Swift-BAT refined analysis
  54. GRB 080514B: Swift-XRT analysis
  55. GRB 080515: Swift detection of a burst
  56. GRB 080514B: possible AGILE detection at E>50 MeV
  57. Swift detection of a possible galactic transient
  58. GRB 080507: Suzaku WAM observation of the prompt emission
  59. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  60. GRB 080507: Keck photometry
  61. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  62. GRB080507: Swift/UVOT followup observations
  63. GRB 080507: Swift-XRT position of a possible afterglow
  64. GRB 080506: VLA radio upper limit
  65. GRB 080506: TLS 2nd Epoch - possible light curve break
  66. GRB 080506: Swift XRT refined analysis
  67. GRB080506: Swift/UVOT observations
  68. GRB 080506, Swift-BAT refined analysis
  69. GRB080503, RIMOTS optical upper limit
  70. GRB 080506: TLS afterglow detection in VRIZ
  71. GRB 080506: Enhanced Swift-XRT position
  72. GRB 080506: Swift detection of a burst with optical afterglow
  73. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  74. GRB080503: Swift/UVOT Upper Limits
  75. GRB080503 XRT refined analysis
  76. GRB 080503, Swift-BAT refined analysis
  77. GRB 080430
  78. GRB 080503: Enhanced Swift-XRT position
  79. GRB 080503: Swift detection of a short burst
  80. GRB 080411: Continued Swift Monitoring
  81. GRB 080430: Optical observations
  82. GRB080430: Swift/UVOT observations
  83. GRB 080430 optical observations
  84. GRB 080430, Swift-BAT refined analysis
  85. GRB 080430: Swift-XRT refined analysis
  86. GRB 080430: Enhanced Swift-XRT position
  87. GRB 080430 - SDSS Pre-Burst Observations
  88. GRB 080430: Swift detection of a burst with optical afterglow
  89. GRB 080430: TAROT Calern observatory optical observations
  90. GRB 080426: Swift-XRT refined analysis
  91. GRB080426: Swift/UVOT upper limits
  92. GRB 080426: Enhanced Swift-XRT position
  93. GRB 080426, Swift-BAT refined analysis
  94. GRB 080426: Swift detection of a possibly short burst
  95. Possible GRB 080315: XRT non-detection of afterglow
  96. Swift-BAT trigger 309665 is not a GRB
  97. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  98. GRB 080420?: Swift detection of a possible short burst
  99. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  100. Swift XRT and UVOT observations of GRB080414

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