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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').

18036 results found.

  1. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  2. GRB 080130: Swift-BAT refined analysis
  3. GRB 080130: further Swift XRT observations confirm fading source
  4. GRB 080129: Swift/UVOT Refined Upper Limits
  5. Swift/UVOT observations of GRB080130
  6. GRB 080130(?): Swift XRT observation
  7. GRB 080129: Swift-XRT refined analysis
  8. GRB 080129: KAIT optical limits
  9. GRB 080129, Swift-BAT refined analysis
  10. GRB 080129: TAROT La Silla observatory optical observations
  11. GRB 080129: Gemini-South photometry
  12. GRB 080129: GROND detection in all bands, and fading
  13. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  14. GRB 080129: Enhanced Swift-XRT position
  15. GRB 080129: Swift XRT position
  16. GRB 080129 (?): UVOT Upper Limits
  17. GRB 080129 (?): Swift detection of a possible burst
  18. A new website of high-level data products for Swift GRBs
  19. GRB 080121: Upper limit on X-ray afterglow
  20. GRB 080123 : Suzaku WAM observation of the prompt emission
  21. Swift trigger(=301779) is not a GRB
  22. GRB 080121: Swift/UVOT upper limits
  23. SNe 2008D and 2007uy: Chandra Detections
  24. GRB 080121: Enhanced Swift-XRT position
  25. Two non-burst Swift SubThreshold triggers
  26. IPN triangulation of GRB080122
  27. GRB 080121: Nearby SDSS galaxies
  28. GRB 080121: Swift-BAT detection of a very weak, short burst
  29. GRB 080123: Swift-XRT refined analysis
  30. GRB 080123: Swift/UVOT refined analysis
  31. GRB 080123, Swift-BAT refined analysis
  32. GRB 080123: Enhanced Swift-XRT position
  33. GRB 080123: Swift detection of a short burst
  34. VLA radio upper limit on GRB 080120
  35. GRB 080120: Swift-XRT refined analysis
  36. UVOT detection of GRB080120
  37. GRB 080120: GROND detection
  38. GRB080120: Swift XRT position
  39. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  40. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  41. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  42. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  43. XRF 080109 in NGC2770: Detectable Superluminal Motion
  44. XRF in NGC 2770: Search for X-ray periodicity
  45. Refined Swift-XRT analysis of the transient in NGC 2770
  46. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  47. Swift UVOT Observations of the X-ray transient in NGC 2770
  48. Early OT detection of XRF in NGC 2770 in Asiago frames
  49. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  50. GRB 071227: Suzaku WAM observation of the prompt emission
  51. Further Swift-BAT analysis of GRB 071227
  52. Konus-Wind observation of GRB 071227
  53. GRB 071227: Swift-XRT refined analysis
  54. GRB071227: Swift/UVOT refined analysis
  55. Swift-BAT refined analysis of short GRB 071227
  56. GRB 071227: Swift detection of a burst
  57. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  58. Swift-BAT trigger 298308 is not a GRB
  59. GRB 071208?: Swift detection of a possible burst
  60. GRB 071129, Swift-BAT refined analysis
  61. GRB 071129: Swift detection of a burst
  62. GRB 071126: Enhanced Swift-XRT position
  63. VLA radio detection of GRB 071122
  64. GRB071122: Swift/UVOT Observations
  65. GRB 071122, Swift-BAT refined analysis
  66. GRB 071122 Swift XRT position update sent in error.
  67. GRB 071122 Swift-XRT refined analysis
  68. GRB 071122: ROTSE-III Optical Limits
  69. GRB 071122: Swift detection of a burst
  70. Swift/UVOT observations of GRB071118
  71. GRB 071117: Swift-XRT revised position
  72. Konus-Wind and Konus-A observations of GRB 071117
  73. Swift XRT follow-up observations of GRB071008
  74. Swift/UVOT upper limits for GRB 071117
  75. GRB071118: Swift XRT refined analysis
  76. GRB 071118, Swift-BAT refined analysis
  77. GRB 071117: TAROT La Silla observatory optical observations
  78. GRB 071118: Swift detection of a burst
  79. GRB 071117: Swift-XRT refined analysis
  80. GRB 071117, Swift-BAT refined analysis
  81. GRB 071117: Swift/XRT position
  82. GRB 071117: Initial Swift/UVOT observations
  83. GRB 071117: Swift detection of a bright burst
  84. Swift detection of MXB 0656-072
  85. VLA radio upper limit on GRB 071112C
  86. ATCA radio observations of short hard burst GRB 071112B
  87. Correction to the Swift-BAT Transient Identification (trigger=296683)
  88. GRB 071112C: Swift-BAT refined analysis
  89. GRB 071112C: Swift/UVOT observations
  90. GRB 071112C: Swift XRT refined analysis
  91. Swift UVOT upper limits of GRB071112B
  92. GRB 071112B: Swift-XRT preliminary analysis
  93. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  94. Swift-BAT trigger 296491 is not a GRB
  95. GRB 071112C: TAROT Calern observatory optical observations
  96. Swift XRT follow-up observations of GRB071028B
  97. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  98. GRB 071112B: ROTSE-III Rapid Optical Limits
  99. GRB 071112C: Swift detection of a burst with an optical counterpart
  100. GRB 071112B: Swift detection of a short hard burst

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