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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"

36313 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. Update on Swift Status
  16. GRB 070920B: ROTSE-III Early Optical Limits
  17. GRB 070925: a long GRB detected by INTEGRAL
  18. Recent SGR1806-20 Activity
  19. GRB 070923, Swift-BAT refined analysis
  20. GRB 070920B: XRT observations
  21. GRB 070923: Galaxies within BAT localization
  22. GRB 070923: Swift detection of a short hard burst
  23. GRB 070917: Suzaku/WAM observation of the prompt emission
  24. GRB 070920B: TAROT La Silla observatory optical observations
  25. GRB 070920b, SMARTS optical observation
  26. GRB 070917: Confirmation of the X-ray afterglow
  27. GRB 070920b: LCO optical observations
  28. GRB 070920B, Swift-BAT refined analysis
  29. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  30. GRB 070920B: NOT optical observations
  31. GRB 070920B: Swift detection of a burst
  32. GRB 070920, Swift-BAT refined analysis
  33. GRB 070920: TAROT Calern observatory optical observations
  34. GRB 070920: Swift detection of a burst
  35. GRB070917: Confirmation of optical afterglow
  36. GRB920925C: search for host galaxy
  37. GRB070917: optical observations
  38. GRB 070917: P60 Observations
  39. GRB 070917: pseudo-z= 2.40 from prompt emission spectrum
  40. Konus-Wind observation of GRB 070917
  41. Swift Status and XRT Calibration Uncertainties
  42. GRB 070917: Swift-XRT observations
  43. GRB 070917: KAIT optical limits
  44. GRB 070917: MITSuME Akeno Ic upper limit
  45. GRB 070917: R band observations
  46. GRB 070917, Swift-BAT refined analysis
  47. GRB 070917: Swift detection of a bright burst
  48. GRB 070911: Suzaku WAM observation of the prompt emission
  49. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  50. GRB 070809: The Swift evidence for the SHB nature of this burst
  51. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  52. GRB 070913: Swift-BAT refined analysis
  53. GRB 070913: Corrected BAT position
  54. GRB 070913: SMARTS optical/IR observations
  55. GRB 070913: TAROT La Silla observatory optical observations
  56. GRB 070913: Swift detection of a burst
  57. GRB 070911: PAIRITEL IR Observations
  58. GRB 070911: Swift XRT refined analysis
  59. GRB 070911, Swift-BAT refined analysis
  60. GRB 070911: Swift detection of a burst
  61. IPN search for a GRB associated with TAROT transient on August 31
  62. Intense burst from SGR 1806-20 detected on September 7
  63. GRB 070809: Confirmation of optical transient
  64. Observations of possible TAROT GRB transient near IC 4779
  65. Candidate Orphan GRB Optical Transient in IC 4779
  66. GRB 070810b: Image Subtraction of Multiple Keck Observations
  67. Las Campanas observations of possible TAROT GRB transient near IC
  68. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  69. Konus-Wind observation of GRB 070824
  70. GRB 070824 - Combined SuperAGILE/IPN Localization
  71. Konus-Wind observation of very bright GRB 070821
  72. GRB 070731: Swift/UVOT Upper Limit
  73. IPN Localization of GRB 070821 (long, very bright)
  74. GRB 070805: UVOT afterglow candidate retraction
  75. GRB070810b: optical candidate
  76. GRB 070810A: ROTSE-III Refined Analysis
  77. GRB 061110A: redshift confirmed
  78. GRB 070810B : Faulkes Telescope South Observations
  79. GRB 070810A: Continued Keck Imaging
  80. GRB 070810B: Keck spectroscopy of possible host galaxies
  81. GRB070810B: Swift/UVOT Upper Limits
  82. GRB 070810B: XRT refined analysis
  83. GRB 070810B, Swift-BAT refined analysis
  84. GRB 070810: MASTER optical observation
  85. GRB 070809: Swift/UVOT Corrected Photometry
  86. Swift Alert 070810.8: MASTER optical observation
  87. Swift Trigger 287421: False trigger due to star tracker loss
  88. GRB 070810A: Swift-BAT refined analysis
  89. GRB 070810B: Xinglong TNT optical Upper Limit
  90. GRB070810B: Optical observations with KANATA
  91. GRB 070809: Swift/UVOT Upper Limits
  92. GRB 070810B: Swift detection of a short burst
  93. VLA upper limit on the short hard burst GRB 070729
  94. GRB 070810: Keck redshift and photometry
  95. No radio detection in superAGILE burst 070724B
  96. GRB 070809: Keck Imaging
  97. GRB 070810: Swift-XRT Team Refined Analysis
  98. GRB 070809: Swift-XRT refined analysis
  99. GRB 070810: enhanced Swift-XRT position
  100. GRB 070810: Swift/UVOT Optical Counterpart

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