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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

37705 results found.

  1. GRB 071003 Optical observations
  2. GRB 071003: P60 Confirmation of Optical Afterglow
  3. GRB 071003: KAIT optical afterglow observations
  4. GRB 071003: Swift detection of a bright burst
  5. GRB 070714B: host galaxy spectroscopic redshift
  6. GRB 071001: Swift-XRT Team refined analysis
  7. GRB 071001, Swift-BAT refined analysis
  8. Faulkes Telescope South observations of GRB 071001
  9. GRB 071001: Swift detection of a burst
  10. VLA observation of GRB 070923
  11. GRB 070911, SMARTS optical/IR afterglow observations
  12. GRB070925: Swift-XRT Afterglow confirmation
  13. GRB 070925: Gemini South Imaging
  14. GRB070925: Swift-XRT Position
  15. GRB 070920B: ROTSE-III Early Optical Limits
  16. GRB 070925: a long GRB detected by INTEGRAL
  17. Recent SGR1806-20 Activity
  18. GRB 070923, Swift-BAT refined analysis
  19. GRB 070920B: XRT observations
  20. GRB 070923: Galaxies within BAT localization
  21. GRB 070923: Swift detection of a short hard burst
  22. GRB 070917: Suzaku/WAM observation of the prompt emission
  23. GRB 070920B: TAROT La Silla observatory optical observations
  24. GRB 070920b, SMARTS optical observation
  25. GRB 070917: Confirmation of the X-ray afterglow
  26. GRB 070920b: LCO optical observations
  27. GRB 070920B, Swift-BAT refined analysis
  28. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  29. GRB 070920B: NOT optical observations
  30. GRB 070920B: Swift detection of a burst
  31. GRB 070920, Swift-BAT refined analysis
  32. GRB 070920: TAROT Calern observatory optical observations
  33. GRB 070920: Swift detection of a burst
  34. GRB070917: Confirmation of optical afterglow
  35. GRB920925C: search for host galaxy
  36. GRB070917: optical observations
  37. GRB 070917: P60 Observations
  38. GRB 070917: pseudo-z= 2.40 from prompt emission spectrum
  39. Konus-Wind observation of GRB 070917
  40. Swift Status and XRT Calibration Uncertainties
  41. GRB 070917: Swift-XRT observations
  42. GRB 070917: KAIT optical limits
  43. GRB 070917: MITSuME Akeno Ic upper limit
  44. GRB 070917: R band observations
  45. GRB 070917, Swift-BAT refined analysis
  46. GRB 070917: Swift detection of a bright burst
  47. GRB 070911: Suzaku WAM observation of the prompt emission
  48. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  49. GRB 070809: The Swift evidence for the SHB nature of this burst
  50. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  51. GRB 070913: Swift-BAT refined analysis
  52. GRB 070913: Corrected BAT position
  53. GRB 070913: SMARTS optical/IR observations
  54. GRB 070913: TAROT La Silla observatory optical observations
  55. GRB 070913: Swift detection of a burst
  56. GRB 070911: PAIRITEL IR Observations
  57. GRB 070911: Swift XRT refined analysis
  58. GRB 070911, Swift-BAT refined analysis
  59. GRB 070911: Swift detection of a burst
  60. IPN search for a GRB associated with TAROT transient on August 31
  61. Intense burst from SGR 1806-20 detected on September 7
  62. GRB 070809: Confirmation of optical transient
  63. Observations of possible TAROT GRB transient near IC 4779
  64. Candidate Orphan GRB Optical Transient in IC 4779
  65. GRB 070810b: Image Subtraction of Multiple Keck Observations
  66. Las Campanas observations of possible TAROT GRB transient near IC
  67. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  68. Konus-Wind observation of GRB 070824
  69. GRB 070824 - Combined SuperAGILE/IPN Localization
  70. Konus-Wind observation of very bright GRB 070821
  71. GRB 070731: Swift/UVOT Upper Limit
  72. IPN Localization of GRB 070821 (long, very bright)
  73. GRB 070805: UVOT afterglow candidate retraction
  74. GRB070810b: optical candidate
  75. GRB 070810A: ROTSE-III Refined Analysis
  76. GRB 061110A: redshift confirmed
  77. GRB 070810B : Faulkes Telescope South Observations
  78. GRB 070810A: Continued Keck Imaging
  79. GRB 070810B: Keck spectroscopy of possible host galaxies
  80. GRB070810B: Swift/UVOT Upper Limits
  81. GRB 070810B: XRT refined analysis
  82. GRB 070810B, Swift-BAT refined analysis
  83. GRB 070810: MASTER optical observation
  84. GRB 070809: Swift/UVOT Corrected Photometry
  85. Swift Alert 070810.8: MASTER optical observation
  86. Swift Trigger 287421: False trigger due to star tracker loss
  87. GRB 070810A: Swift-BAT refined analysis
  88. GRB 070810B: Xinglong TNT optical Upper Limit
  89. GRB070810B: Optical observations with KANATA
  90. GRB 070809: Swift/UVOT Upper Limits
  91. GRB 070810B: Swift detection of a short burst
  92. VLA upper limit on the short hard burst GRB 070729
  93. GRB 070810: Keck redshift and photometry
  94. No radio detection in superAGILE burst 070724B
  95. GRB 070809: Keck Imaging
  96. GRB 070810: Swift-XRT Team Refined Analysis
  97. GRB 070809: Swift-XRT refined analysis
  98. GRB 070810: enhanced Swift-XRT position
  99. GRB 070810: Swift/UVOT Optical Counterpart
  100. GRB 070810: ROTSE-III Detection of Optical Counterpart

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