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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"

10822 results found.

  1. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  2. GRB 080325, Swift-BAT refined analysis
  3. GRB 080325: GROND Observations
  4. GRB080319B: optical observations
  5. GRB 080325: Early observations from OSN
  6. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  7. GRB 080319D: optical upper limit
  8. GRB 080319B - CARMA mm Observations
  9. GRB 080320: J detection with FLAMINGOS
  10. GRB 080319D: Swift XRT refined analysis
  11. Konus-Wind observation of GRB 080319C
  12. GRB 080319B: Gemini-South photometry
  13. GRB 080319B: Allen Telescope Array Observations
  14. Konus-Wind observation of GRB 080319B
  15. GRB 080319B: WSRT Radio Observations
  16. GRB 080320: Swift detection of a burst
  17. GRB 080320: ROTSE-III Optical Limits
  18. GRB 080319C: Swift detection of a burst with an optical afterglow
  19. GRB 080319B: Change in power law decay index
  20. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  21. Swift trigger 306323: Swift-BAT/XRT refined analysis
  22. GRB080310: Optical observation by MITSuME telescope
  23. GRB 080310, Swift-BAT refined analysis
  24. GRB080307: optical upper limit
  25. GRB080310 : Lulin optical observation
  26. GRB 080310: RRM optical photometry with the VLT
  27. GRB 080310, SMARTS optical/IR afterglow observations
  28. GRB080307, optical upper limit
  29. GRB080229, optical upper limit
  30. GRB080307: Optical upper limits
  31. GRB 080307, Preliminary Swift-BAT refined analysis
  32. GRB 080303, Swift-BAT refined analysis
  33. GRB 080303A: ROTSE-III Optical Limits
  34. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  35. GRB 080229A: ROTSE-III Optical Limits
  36. GRB 080229: Swift detection of a bright burst
  37. GRB080207: optical observations
  38. Swift-XRT improved positions, and new redshift limits.
  39. GRB 080218B: GROND upper limits
  40. GRB 080218: Swift detection of a burst
  41. Konus-Wind observation of GRB 080211
  42. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  43. GRB 080212: GROND detects afterglow
  44. GRB 080212: Swift detection of a burst
  45. IPN localization of GRB 080211
  46. GRB 080210: GOND detection in all bands and redshift upper limit
  47. GRB 080205: GAO 150cm telescope Optical limit
  48. GRB 080207, Swift-BAT refined analysis
  49. Swift detection of AX J1749.1-2639
  50. GRB 080207, Swift-BAT refined analysis
  51. GRB080207: RTT150 Optical Observations
  52. GRB 080207: TAROT Calern observatory optical observations
  53. GRB 080207: Swift detection of a burst
  54. Konus-Wind observation of GRB 080204
  55. GRB 080205 optical upper limit
  56. GRB 080205: optical observation
  57. IPN localization of very hard GRB 080204
  58. GRB 080205: Swift XRT refined analysis
  59. GRB 080130: further Swift XRT observations confirm fading source
  60. GRB 080130?: Detection of a possible burst by BATSS
  61. GRB 080129: Swift-XRT refined analysis
  62. GRB 080129: KAIT optical limits
  63. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  64. GRB 080129: optical limit by Pi of the Sky
  65. GRB 080129, Swift-BAT refined analysis
  66. A new website of high-level data products for Swift GRBs
  67. GRB 080121: Upper limit on X-ray afterglow
  68. Konus-Wind observation of GRB 080122
  69. SNe 2008D and 2007uy: Chandra Detections
  70. IPN triangulation of GRB080122
  71. GRB 080123, Swift-BAT refined analysis
  72. GRB 080120: Swift-XRT refined analysis
  73. GRB 080120: GROND detection
  74. GRB 080120 : Planned XMM-Newton observation
  75. GRB 080120: a long GRB detected by INTEGRAL
  76. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  77. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  78. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  79. XRF 080109 in NGC2770: Detectable Superluminal Motion
  80. XRF in NGC 2770: Search for X-ray periodicity
  81. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  82. GRB 071227: Suzaku WAM observation of the prompt emission
  83. Konus-Wind observation of GRB 071227
  84. GRB 071227: Swift-XRT refined analysis
  85. GRB 071227: Swift detection of a burst
  86. GRB 071125: Suzaku WAM observation of the prompt emission
  87. Konus-Wind and Konus-A observations of GRB 071125
  88. IPN triangulation of very bright GRB 071125
  89. Disregard the "GRB 071126" position
  90. GRB071122: Swift/UVOT Observations
  91. GRB 071122: ROTSE-III Optical Limits
  92. GRB071118 MITSuME OAO optical observation
  93. GRB 071117: Swift-XRT revised position
  94. Konus-Wind and Konus-A observations of GRB 071117
  95. Swift/UVOT upper limits for GRB 071117
  96. GRB 071117: Gemini Optical Afterglow Discovery
  97. GRB 071118, Swift-BAT refined analysis
  98. GRB 071117: TAROT La Silla observatory optical observations
  99. GRB 071118: Swift detection of a burst
  100. GRB 071117: Gemini Observations

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