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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"

11778 results found.

  1. GRB 080414: A long GRB detected by INTEGRAL
  2. GRB 080413B: Swift XRT refined analysis
  3. GRB 080413B, Swift-BAT refined analysis
  4. GRB 080413A: Swift-XRT refined analysis
  5. GRB 080413A Bootes observation
  6. GRB 080411: Swift-XRT Refined Analysis
  7. Konus-Wind observation of GRB 080411
  8. GRB 080411: Swift detection of a bright burst
  9. GRB 080330 optical observations
  10. GRB 080408: GRB Localization by SuperAGILE
  11. GRB 080405: Swift-BAT refined analysis
  12. GRB 080330, SMARTS optical/IR afterglow observations
  13. Konus-Wind observation of GRB 080328
  14. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  15. GRB 080325, Swift-BAT refined analysis
  16. GRB 080325: GROND Observations
  17. GRB080319B: optical observations
  18. GRB 080325: Early observations from OSN
  19. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  20. GRB 080319D: optical upper limit
  21. GRB 080319B - CARMA mm Observations
  22. GRB 080320: J detection with FLAMINGOS
  23. GRB 080319D: Swift XRT refined analysis
  24. Konus-Wind observation of GRB 080319C
  25. GRB 080319B: Gemini-South photometry
  26. GRB 080319B: Allen Telescope Array Observations
  27. Konus-Wind observation of GRB 080319B
  28. GRB 080319B: WSRT Radio Observations
  29. GRB 080320: Swift detection of a burst
  30. GRB 080320: ROTSE-III Optical Limits
  31. GRB 080319C: Swift detection of a burst with an optical afterglow
  32. GRB 080319B: Change in power law decay index
  33. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  34. Swift trigger 306323: Swift-BAT/XRT refined analysis
  35. GRB080310: Optical observation by MITSuME telescope
  36. GRB 080310, Swift-BAT refined analysis
  37. GRB080307: optical upper limit
  38. GRB080310 : Lulin optical observation
  39. GRB 080310: RRM optical photometry with the VLT
  40. GRB 080310, SMARTS optical/IR afterglow observations
  41. GRB080307, optical upper limit
  42. GRB080229, optical upper limit
  43. GRB080307: Optical upper limits
  44. GRB 080307, Preliminary Swift-BAT refined analysis
  45. GRB 080303, Swift-BAT refined analysis
  46. GRB 080303A: ROTSE-III Optical Limits
  47. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  48. GRB 080229A: ROTSE-III Optical Limits
  49. GRB 080229: Swift detection of a bright burst
  50. GRB080207: optical observations
  51. Swift-XRT improved positions, and new redshift limits.
  52. GRB 080218B: GROND upper limits
  53. GRB 080218: Swift detection of a burst
  54. Konus-Wind observation of GRB 080211
  55. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  56. GRB 080212: GROND detects afterglow
  57. GRB 080212: Swift detection of a burst
  58. IPN localization of GRB 080211
  59. GRB 080210: GOND detection in all bands and redshift upper limit
  60. GRB 080205: GAO 150cm telescope Optical limit
  61. GRB 080207, Swift-BAT refined analysis
  62. Swift detection of AX J1749.1-2639
  63. GRB 080207, Swift-BAT refined analysis
  64. GRB080207: RTT150 Optical Observations
  65. GRB 080207: TAROT Calern observatory optical observations
  66. GRB 080207: Swift detection of a burst
  67. Konus-Wind observation of GRB 080204
  68. GRB 080205 optical upper limit
  69. GRB 080205: optical observation
  70. IPN localization of very hard GRB 080204
  71. GRB 080205: Swift XRT refined analysis
  72. GRB 080130: further Swift XRT observations confirm fading source
  73. GRB 080130?: Detection of a possible burst by BATSS
  74. GRB 080129: Swift-XRT refined analysis
  75. GRB 080129: KAIT optical limits
  76. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  77. GRB 080129: optical limit by Pi of the Sky
  78. GRB 080129, Swift-BAT refined analysis
  79. A new website of high-level data products for Swift GRBs
  80. GRB 080121: Upper limit on X-ray afterglow
  81. Konus-Wind observation of GRB 080122
  82. SNe 2008D and 2007uy: Chandra Detections
  83. IPN triangulation of GRB080122
  84. GRB 080123, Swift-BAT refined analysis
  85. GRB 080120: Swift-XRT refined analysis
  86. GRB 080120: GROND detection
  87. GRB 080120 : Planned XMM-Newton observation
  88. GRB 080120: a long GRB detected by INTEGRAL
  89. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  90. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  91. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  92. XRF 080109 in NGC2770: Detectable Superluminal Motion
  93. XRF in NGC 2770: Search for X-ray periodicity
  94. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  95. GRB 071227: Suzaku WAM observation of the prompt emission
  96. Konus-Wind observation of GRB 071227
  97. GRB 071227: Swift-XRT refined analysis
  98. GRB 071227: Swift detection of a burst
  99. GRB 071125: Suzaku WAM observation of the prompt emission
  100. Konus-Wind and Konus-A observations of GRB 071125

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