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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"

26502 results found.

  1. GRB 071010B, Swift-BAT refined analysis
  2. GRB 071006, Swift-BAT refined analysis
  3. GRB 071010A: Keck/LRIS Photometry
  4. GRB 071010B: Swift detection of a burst
  5. Konus-Wind observation of GRB 071006
  6. GRB071008: Swift-XRT observation
  7. GRB 071010 REM NIR observations
  8. GRB 071010: TAROT La Silla observatory photometry of the afterglow
  9. GRB 071010: Keck Observations of the Afterglow
  10. GRB 071010: TAROT La Silla observatory detection of the afterglow
  11. GRB 071010: Swift detection of a burst
  12. GRB 071006 Swift-BAT detection of a burst
  13. GRB 071003: XRT refined analysis
  14. GRB070920A: MAGIC telescope GeV observation
  15. Radio detection of GRB 071003 with the VLA
  16. GRB 070810B: further XRT analysis
  17. Konus-Wind observation of GRB 071003
  18. GRB071003: Faulkes Telescope North observations
  19. GRB 071003: Possible rebrightening
  20. GRB 071003 : Lulin R-band observations
  21. GRB 071003: Keck HIRES spectroscopy
  22. GRB 071003: P60 Confirmation of Optical Afterglow
  23. GRB 070714B: host galaxy spectroscopic redshift
  24. GRB 071001: Swift-XRT Team refined analysis
  25. GRB 071001, Swift-BAT refined analysis
  26. Faulkes Telescope South observations of GRB 071001
  27. GRB 071001: Swift detection of a burst
  28. VLA observation of GRB 070923
  29. GRB 070911, SMARTS optical/IR afterglow observations
  30. GRB 070925: Gemini South Imaging
  31. GRB070925: Swift-XRT Position
  32. GRB 070920B: ROTSE-III Early Optical Limits
  33. GRB 070925: a long GRB detected by INTEGRAL
  34. GRB 070920B: TAROT La Silla observatory optical observations
  35. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  36. GRB 070920B: NOT optical observations
  37. GRB 070920: TAROT Calern observatory optical observations
  38. SGR1806-20: Swift-BAT detection of enhanced activity
  39. GRB920925C: search for host galaxy
  40. GRB 070917: P60 Observations
  41. Konus-Wind observation of GRB 070917
  42. Swift Status and XRT Calibration Uncertainties
  43. GRB 070917: Swift-XRT observations
  44. GRB 070917: MITSuME Akeno Ic upper limit
  45. GRB 070917: R band observations
  46. GRB 070911: Suzaku WAM observation of the prompt emission
  47. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  48. GRB 070809: The Swift evidence for the SHB nature of this burst
  49. GRB 070913: SMARTS optical/IR observations
  50. GRB 070913: TAROT La Silla observatory optical observations
  51. GRB 070911: PAIRITEL IR Observations
  52. GRB 070911: Swift XRT refined analysis
  53. IPN search for a GRB associated with TAROT transient on August 31
  54. Intense burst from SGR 1806-20 detected on September 7
  55. GRB 070809: Confirmation of optical transient
  56. Candidate Orphan GRB Optical Transient in IC 4779
  57. Las Campanas observations of possible TAROT GRB transient near IC
  58. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  59. Konus-Wind observation of GRB 070824
  60. GRB 070824 - Combined SuperAGILE/IPN Localization
  61. Konus-Wind observation of very bright GRB 070821
  62. GRB 070731: Swift/UVOT Upper Limit
  63. GRB 070805: UVOT afterglow candidate retraction
  64. Swift observatory off line
  65. GRB 070810B : Faulkes Telescope South Observations
  66. GRB 070810A: Continued Keck Imaging
  67. GRB 070810B: Keck spectroscopy of possible host galaxies
  68. GRB070810B: Swift/UVOT Upper Limits
  69. GRB 070810B: XRT refined analysis
  70. GRB 070810B: Xinglong TNT optical Upper Limit
  71. GRB070810B: Optical observations with KANATA
  72. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  73. GRB 070809: Swift/UVOT Upper Limits
  74. VLA upper limit on the short hard burst GRB 070729
  75. No radio detection in superAGILE burst 070724B
  76. GRB 070809: Keck Imaging
  77. GRB 070810: Swift-XRT Team Refined Analysis
  78. GRB 070809: Swift-XRT refined analysis
  79. GRB 070810: enhanced Swift-XRT position
  80. GRB 070810: Swift/UVOT Optical Counterpart
  81. GRB 070808: Swift/UVOT upper limits
  82. GRB 070809: Swift detection of a short burst
  83. GRB 070808 : Faulkes Telescope South Observations
  84. GCN Swift XRT update position notices and enhanced position circulars
  85. GRB 070808: Swift XRT refined analysis
  86. GRB 070808: OPTIMA-Burst optical upper limit
  87. GRB 070808: Xinglong TNT optical Upper Limit
  88. GRB070808: Optical observations with KANATA
  89. GRB070808 - SDSS Pre-Burst Observations
  90. GRB 070808: ROTSE-III Optical Limits
  91. GRB070805 XRT and UVOT afterglow candidate
  92. GRB070612A: Radio upper limit from GMRT
  93. GRB 070721B: correct afterglow position
  94. Swift/UVOT observations of GRB070805
  95. GRB 070805: Swift detection of a burst
  96. UVOT observations of SAXJ1810.8-2609
  97. Swift detection of a outburst from SAX J1810.8-2609
  98. VLA non-detection of GRB 070721B
  99. GRB 070802: REM optical observations
  100. GRB 070802: Swift-XRT refined analysis

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