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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"

24045 results found.

  1. GRB 100331B: GROND Upper limits
  2. Master-Net observations on the Swift trigger on LS V +44 17
  3. GRB 100401A: Swift/UVOT Upper Limit
  4. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  5. GRB 100401A: Fermi GBM detection
  6. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  7. GRB 100316A: R-band limit
  8. GRB 100331B: Swift/XRT possible afterglow candidate
  9. Swift detection of LS V +44 17
  10. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  11. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  12. Konus-Wind observation of GRB 100322A
  13. Fermi GBM detection of four Solar Flares
  14. GRB 100322A: Suzaku WAM observation of the prompt emission
  15. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  16. GRB 100325A: Fermi LAT detection
  17. GROND observations of GRB100316D/SN2010bh
  18. GRB 100325A: Fermi GBM detection
  19. GRB 100324A: GROND observations
  20. GRB 100324A found in ground analysis of BAT data
  21. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  22. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  23. SGR 1833-0832: Swift/UVOT Upper Limits
  24. GRB 100322A: Fermi GBM detection
  25. Probable SGR 1833-0832: Swift-XRT refined analysis
  26. Swift-XRT refined position of the probable new SGR 1833-0832
  27. Swift-BAT refined analysis of the probable new SGR 1833-0832
  28. GRB 100219A: MASTER-Net optical alert observations
  29. GRB 100319A: Swift detection of a burst; possible SGR
  30. GRB 100316D: Pre-burst emission measured by BAT
  31. GRB 100316D: Swift/UVOT Observations
  32. GRB 100316D: Swift XRT enhanced position and further refined analysis
  33. GRB 100316B: Swift-XRT refined analysis
  34. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  35. Trigger 416226 is probably not a GRB
  36. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  37. GRB 100316D: Swift-BAT refined analysis
  38. GRB100316C: Swift/UVOT Upper Limits
  39. GRB 100316C: Swift-BAT refined analysis
  40. GRB 100316B: Swift/UVOT observations
  41. GRB 100316C: Swift-XRT team refined analysis
  42. GRB 100316D: Swift XRT refined analysis
  43. GRB 100316A: TAROT Calern observatory optical observations
  44. GRB 100316A: Swift-XRT refined analysis
  45. GRB 100316A: Swift-BAT refined analysis
  46. GRB 100316B: Swift-BAT refined analysis
  47. GRB100316A: Swift/UVOT Upper Limits
  48. Trigger 416140 is almost certainly not a GRB
  49. GRB 100316D: Swift detection of a burst
  50. GRB 100316B: Skynet/PROMPT Observations of Fading
  51. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  52. GRB 100316C: Swift detection of a burst
  53. GRB 100316B: Swift detection of a burst with optical counterpart
  54. GRB 100316 optical candidate from 1.23m CAHA telescope
  55. GRB 100316 optical candidate from 1.23m CAHA telescope
  56. GRB 100316A: Swift/UVOT Observations
  57. GRB 100316A: Swift-XRT detection
  58. GRB 100316A: Swift detection of a burst
  59. IBAS Alert 5992 is not a GRB, but XTE J1855-026
  60. GRB 100305A: Super-LOTIS early observations
  61. GRB 100305A, Swift-BAT refined analysis
  62. GRB 100305A: Swift/UVOT Upper Limits
  63. GRB 100305A: Swift-XRT refined analysis
  64. GRB 100305A Optical Observations
  65. GRB 100305A: PAIRITEL NIR Upper Limits
  66. GRB 100305A: Swift detection of a burst
  67. GRB 100302A: Ondrejov 65cm limit
  68. GRB 100302A: Swift/UVOT Upper Limits
  69. GRB 100302A: Swift-XRT refined analysis
  70. GRB 100302A: Optical observations at Crni Vrh
  71. GRB 100302A: MASTER-Net optical alert observations
  72. GRB 100302A, Swift-BAT refined analysis
  73. GRB 100302A: Skynet/DAO Observations
  74. GRB 100302A: Swift detection of a burst
  75. GRB 100224B: Fermi GBM detection
  76. GRB 100219A: GAO 150cm telescope Optical Observation
  77. GRB 100224A SHB found in ground analysis of BAT data
  78. GRB 100225A: Fermi LAT detection
  79. GRB 100225A: Fermi GBM detection
  80. GRB 100223A: Fermi GBM detection
  81. Swift Triggers 413744 and 413745 are not GRBs
  82. GRB
  83. GRB 100219A: XRT refined analysis
  84. GRB 100216A: Swift/UVOT Observations
  85. GRB100219A Akeno and Okayama MITSuME Optical Observation
  86. GRB 100219A: GROND observations
  87. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  88. GRB 100216A: XRT Refined Analysis
  89. GRB 100219A: Swift-BAT refined analysis
  90. GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
  91. GRB 100218A : Fermi GBM detection
  92. GRB 100219A: Swift detection of a burst
  93. GRB 100216A: Keck imaging
  94. GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data
  95. GRB 100213A: Swift-BAT lag analysis indicates probably SHB
  96. GRB 100213B: GRT Optical Observation
  97. GRB 100213A: GRT Optical Observation
  98. GRB 100213A: Swift-BAT refined analysis
  99. GRB 100213B: Swift/UVOT Upper Limits
  100. GRB 100213A: Swift/UVOT Upper Limits

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