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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"

28051 results found.

  1. GRB 080430: Swift detection of a burst with optical afterglow
  2. GRB 080430: TAROT Calern observatory optical observations
  3. GRB 080426: Swift-XRT refined analysis
  4. GRB080426: Swift/UVOT upper limits
  5. GRB 080426: Enhanced Swift-XRT position
  6. GRB 080426, Swift-BAT refined analysis
  7. GRB 080426: Swift detection of a possibly short burst
  8. Possible GRB 080315: XRT non-detection of afterglow
  9. GRB 080320 : Faulkes Telescope North Observations
  10. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  11. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  12. GRB080310, BVRcIc field calibration
  13. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  14. Swift XRT and UVOT observations of GRB080414
  15. GRB 080319B: Jet Break, Energetics, Supernova
  16. GRB 080413B: Faulkes Telescope South optical afterglow observations
  17. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  18. GRB 080413A: Suzaku WAM observation of the prompt emission
  19. GRB 080413B: Suzaku WAM observation of the prompt emission
  20. GRB 080414: RTT150 optical observations
  21. GRB 080414: A long GRB detected by INTEGRAL
  22. VLA radio observations of GRB 080413B
  23. VLA radio observations of GRB 080413A
  24. GRB 080413B: Ep,i-Eiso correlation
  25. GRB080413B
  26. Swift-BAT spectral lag analysis of GRB 080413B
  27. GRB 080413a, SMARTS optical/IR afterglow observations
  28. GRB080413A: Swift/UVOT observations
  29. GRB 080413B, Swift-BAT refined analysis
  30. GRB 080413A: Swift-XRT refined analysis
  31. GRB 080413A, Swift-BAT refined analysis
  32. GRB 080413A Bootes observation
  33. GRB080413B: REM NIR & Optical Observation
  34. GRB 080413B: GROND detection of afterglow in all bands
  35. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  36. GRB 080413A: REM detection of the NIR Afterglow
  37. GRB 080413: Enhanced Swift-XRT position
  38. GRB 080413: TAROT Calern observatory optical observations
  39. GRB 080413: Swift detection of a burst with an optical afterglow
  40. GRB 080413: ROTSE-III Detection of Optical Counterpart
  41. GRB 080411: Swift/UVOT refined analysis
  42. GRB 080411, Swift-BAT refined analysis
  43. GRB 080411: Swift-XRT Refined Analysis
  44. GRB 080411: Enhanced Swift-XRT position
  45. GRB 080411: GROND detection of optical afterglow candidate
  46. GRB 080411: Swift detection of a bright burst
  47. GRB 080409: Swift-BAT refined analysis
  48. GRB 080408: GROND detection of optical/NIR afterglow candidate
  49. GRB 080330 optical observations
  50. Swift/UVOT observations of GRB080409
  51. GRB 080409: Swift XRT refined analysis
  52. GRB 080408: Swift-XRT position of a possible afterglow
  53. GRB 080409: Enhanced Swift-XRT position
  54. GRB 080409: REM optical/NIR observations
  55. GRB 080409: Swift detection of a burst
  56. GRB 080408: Analysis of AGILE Gamma-ray data
  57. GRB 080408: GRB Localization by SuperAGILE
  58. GRB 080319A: Early RAPTOR optical limits
  59. GRB 080319B: HST observations
  60. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  61. GRB 080405: Swift-BAT refined analysis
  62. GRB 080405: Swift-XRT position
  63. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  64. GRB 080325: optical upper limit
  65. GRB 080328: GAO 150cm telescope Optical Observation
  66. GRB080330: Improved Swift XRT Position
  67. GRB080330: optical observations
  68. GRB080328, RIMOTS optical upper limit
  69. GRB080330: Swift XRT refined analysis
  70. GRB 080330: REM optical observations
  71. GRB 080330 Swift-UVOT refined analysis
  72. GRB 080328: Suzaku WAM observation of the prompt emission
  73. GRB080330: TNT optical observations
  74. GRB 080330, Swift-BAT refined analysis
  75. Konus-Wind observation of GRB 080328
  76. GRB 080330: GROND Observations
  77. GRB 080330: TAROT Calern observatory optical observations
  78. GRB 080330A: PAIRITEL Infrared Detections
  79. GRB 080330: error in reported XRT position
  80. GRB080330 - SDSS Pre-Burst Observations
  81. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  82. GRB 080330: Swift detection of a burst with an optical counterpart
  83. GRB 080330: TAROT Calern observatory optical detection
  84. GRB 080328, Swift-BAT refined analysis
  85. GRB 080325, Swift-BAT refined analysis
  86. Swift/UVOT observations of GRB080328
  87. GRB080319B, BVRcIc field calibration
  88. GRB 080328: Enhanced Swift-XRT position
  89. GRB 080328: Swift detection of a burst with an optical counterpart
  90. GRB 080325: Subaru detection of NIR afterglow candidate
  91. GRB 080325: GROND Observations
  92. GRB 080325: Swift/UVOT Upper Limits
  93. GRB 080325: Early observations from OSN
  94. GRB 080325: NIR afterglow candidate
  95. GRB 080319D: GROND Detection of the Optical Counterpart
  96. GRB 080325: Enhanced Swift-XRT position
  97. GRB 080325: Swift detection of a burst
  98. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  99. GRB 080319B: Spitzer Mid-infrared Observations
  100. GRB 080319C: Suzaku WAM observation of the prompt emission

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