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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"

11774 results found.

  1. GRB 080413A Bootes observation
  2. GRB 080411: Swift-XRT Refined Analysis
  3. Konus-Wind observation of GRB 080411
  4. GRB 080411: Swift detection of a bright burst
  5. GRB 080330 optical observations
  6. GRB 080408: GRB Localization by SuperAGILE
  7. GRB 080405: Swift-BAT refined analysis
  8. GRB 080330, SMARTS optical/IR afterglow observations
  9. Konus-Wind observation of GRB 080328
  10. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  11. GRB 080325, Swift-BAT refined analysis
  12. GRB 080325: GROND Observations
  13. GRB080319B: optical observations
  14. GRB 080325: Early observations from OSN
  15. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  16. GRB 080319D: optical upper limit
  17. GRB 080319B - CARMA mm Observations
  18. GRB 080320: J detection with FLAMINGOS
  19. GRB 080319D: Swift XRT refined analysis
  20. Konus-Wind observation of GRB 080319C
  21. GRB 080319B: Gemini-South photometry
  22. GRB 080319B: Allen Telescope Array Observations
  23. Konus-Wind observation of GRB 080319B
  24. GRB 080319B: WSRT Radio Observations
  25. GRB 080320: Swift detection of a burst
  26. GRB 080320: ROTSE-III Optical Limits
  27. GRB 080319C: Swift detection of a burst with an optical afterglow
  28. GRB 080319B: Change in power law decay index
  29. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  30. Swift trigger 306323: Swift-BAT/XRT refined analysis
  31. GRB080310: Optical observation by MITSuME telescope
  32. GRB 080310, Swift-BAT refined analysis
  33. GRB080307: optical upper limit
  34. GRB080310 : Lulin optical observation
  35. GRB 080310: RRM optical photometry with the VLT
  36. GRB 080310, SMARTS optical/IR afterglow observations
  37. GRB080307, optical upper limit
  38. GRB080229, optical upper limit
  39. GRB080307: Optical upper limits
  40. GRB 080307, Preliminary Swift-BAT refined analysis
  41. GRB 080303, Swift-BAT refined analysis
  42. GRB 080303A: ROTSE-III Optical Limits
  43. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  44. GRB 080229A: ROTSE-III Optical Limits
  45. GRB 080229: Swift detection of a bright burst
  46. GRB080207: optical observations
  47. Swift-XRT improved positions, and new redshift limits.
  48. GRB 080218B: GROND upper limits
  49. GRB 080218: Swift detection of a burst
  50. Konus-Wind observation of GRB 080211
  51. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  52. GRB 080212: GROND detects afterglow
  53. GRB 080212: Swift detection of a burst
  54. IPN localization of GRB 080211
  55. GRB 080210: GOND detection in all bands and redshift upper limit
  56. GRB 080205: GAO 150cm telescope Optical limit
  57. GRB 080207, Swift-BAT refined analysis
  58. Swift detection of AX J1749.1-2639
  59. GRB 080207, Swift-BAT refined analysis
  60. GRB080207: RTT150 Optical Observations
  61. GRB 080207: TAROT Calern observatory optical observations
  62. GRB 080207: Swift detection of a burst
  63. Konus-Wind observation of GRB 080204
  64. GRB 080205 optical upper limit
  65. GRB 080205: optical observation
  66. IPN localization of very hard GRB 080204
  67. GRB 080205: Swift XRT refined analysis
  68. GRB 080130: further Swift XRT observations confirm fading source
  69. GRB 080130?: Detection of a possible burst by BATSS
  70. GRB 080129: Swift-XRT refined analysis
  71. GRB 080129: KAIT optical limits
  72. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  73. GRB 080129: optical limit by Pi of the Sky
  74. GRB 080129, Swift-BAT refined analysis
  75. A new website of high-level data products for Swift GRBs
  76. GRB 080121: Upper limit on X-ray afterglow
  77. Konus-Wind observation of GRB 080122
  78. SNe 2008D and 2007uy: Chandra Detections
  79. IPN triangulation of GRB080122
  80. GRB 080123, Swift-BAT refined analysis
  81. GRB 080120: Swift-XRT refined analysis
  82. GRB 080120: GROND detection
  83. GRB 080120 : Planned XMM-Newton observation
  84. GRB 080120: a long GRB detected by INTEGRAL
  85. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  86. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  87. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  88. XRF 080109 in NGC2770: Detectable Superluminal Motion
  89. XRF in NGC 2770: Search for X-ray periodicity
  90. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  91. GRB 071227: Suzaku WAM observation of the prompt emission
  92. Konus-Wind observation of GRB 071227
  93. GRB 071227: Swift-XRT refined analysis
  94. GRB 071227: Swift detection of a burst
  95. GRB 071125: Suzaku WAM observation of the prompt emission
  96. Konus-Wind and Konus-A observations of GRB 071125
  97. IPN triangulation of very bright GRB 071125
  98. GRB071122: Swift/UVOT Observations
  99. GRB 071122: ROTSE-III Optical Limits
  100. GRB071118 MITSuME OAO optical observation

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