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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"

23619 results found.

  1. GRB 100223A: Fermi GBM detection
  2. GRB 100219A - Gemini South Spectroscopy
  3. GRB 100216A: Swift/UVOT Observations
  4. GRB100219A Akeno and Okayama MITSuME Optical Observation
  5. GRB 100219A: GROND observations
  6. GRB 100219A: Swift-BAT refined analysis
  7. GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
  8. GRB 100218A : Fermi GBM detection
  9. GRB 100219A: Swift detection of a burst
  10. GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data
  11. GRB 100213A: Swift-BAT refined analysis
  12. GRB 100213B: Gemini-N Observations
  13. GRB 100213B: Swift-BAT refined analysis
  14. GRB 100213B: Swift detection of a burst
  15. GRB 100213A: Swift detection of a burst
  16. GRB 100206A: Second epoch Gemini-north observations and afterglow limits
  17. Swift/UVOT observations of GRB120212A
  18. GRB 100212A: LOAO R-band Detection/V-band Observation
  19. GRB 100212A: Swift-BAT refined analysis
  20. GRB 100212A: Swift detection of a burst
  21. GRB 091127: Detection of a Supernova
  22. GRB 100205A: Keck limits on an underlying host galaxy
  23. GRB 100205A: BOAO/LOAO zYJK observation
  24. GRB 100205B: Fermi GBM detection
  25. GRB 100206A: GROND upper limits
  26. GRB 100206A: Gemini-North observations
  27. GRB 100131A: MASTER-Net optical alert observations
  28. GRB 100206A: YNAO-GMG observations
  29. GRB 100206A: MASTER-Net optical alert observations
  30. GRB 100206A: PAIRITEL Photometry of Host Candidate
  31. GRB 100206A - Keck/LRIS Spectroscopy
  32. GRB100206: MITSuME optical upper limits
  33. GRB 100206A: WHT candidate afterglow
  34. GRB 100206A: optical observations from Southern Spain
  35. GRB 100205A: GROND upper limits
  36. GRB 100206A: Optical limit
  37. GRB 100206A: Swift-BAT refined analysis
  38. GRB 100206A: Swift detection of a short hard burst
  39. GRB100205A: CFHT z'-band observation
  40. GRB 100130B: Fermi GBM detection
  41. GRB 100113A: Fermi GBM detection
  42. GRB 100205A: Swift-BAT refined analysis
  43. GRB 100205A: Swift XRT refined analysis
  44. GRB 100203A: Swift XRT and UVOT refined analyses
  45. GRB 100205A: Gemini-South Observations
  46. GRB 100131A: Suzaku WAM observation of the prompt emission
  47. GRB 100205A: Swift detection of a burst
  48. GRB 100203A Detected in Ground Analysis of BAT Data
  49. Short X-ray Transient detected by MAXI/GSC
  50. GRB 100119A: Suzaku WAM observation of the prompt emission
  51. Konus-Wind observation of GRB 100119A
  52. GRB 100122A: MASTER-Net optical observations
  53. GRB 100116A: Suzaku WAM observation of the prompt emission
  54. GRB 100119A: Swift-BAT refined analysis
  55. GRB 100119A: Swift detection of a burst
  56. Konus-Wind observation of GRB 100116A
  57. GRB 100117A: Gemini North spectroscopy
  58. Swift/UVOT refined analysis of GRB100117A
  59. GRB 100117A: Optical object inside the revised XRT error circle
  60. GRB 100117A: Swift-XRT refined analysis
  61. GRB 100117A: Gemini-North upper limit
  62. GRB 100117A: Magellan IMACS imaging
  63. GRB 100117A: Swift-BAT refined analysis
  64. GRB 100117A: Swift detection of a short hard burst
  65. GRB 100116A: Fermi GBM detection
  66. GRB 100115A: Swift-XRT candidate afterglow
  67. GRB 100115A detected in ground analysis of Swift-BAT data
  68. GRB 100111A: Swift-BAT refined analysis
  69. GRB 100111A: Swift detection of a burst with an optical afterglow
  70. Swift/BAT Detects an Outburst from XTE J1901+014
  71. GRB 100103A: GROND Upper Limits
  72. Konus-Wind observation of GRB 100103A
  73. GRB 100103A: Swift/UVOT Upper Limits
  74. GRB 100103A: Correction to Swift position error
  75. GRB 100103A: Swift/XRT position
  76. GRB 100103A: a long GRB detected with INTEGRAL
  77. Swift Trigger 381591: Retraction of Reported UVOT Source
  78. Swift Trigger 381591 is probably not a burst
  79. Swift Trigger 381591: Uncatalogued UVOT Source
  80. GRB 091230: Swift/UVOT Observations
  81. Trigger 381591: Swift detection of a possible burst
  82. GRB 091230: a long GRB detected by INTEGRAL
  83. Trigger 381434: Swift detection of a possible burst
  84. GRB 091221 : IRSF NIR upper limit
  85. GRB 091221: Skynet/PROMPT Detections
  86. GRB 091117: Swift-XRT late time observations
  87. GRB 091221 Swift-BAT refined analysis
  88. GRB091221: Swift/UVOT refined analysis, correction.
  89. GRB 091221: Swift/UVOT refined analysis
  90. GRB 091221: UVOT Confirmation of an Optical Afterglow
  91. GRB 091221: Swift detection of a burst
  92. Swift trigger 379449 (possible GRB) is not a burst
  93. GRB 091215: Faulkes Telescope North observations
  94. Trigger 379449: Swift detection of a possible burst
  95. GRB 091208A: Suzaku WAM observation of the prompt emission
  96. Konus-Wind observation of GRB 091208A
  97. GRB091208A: Swift/UVOT refined analysis
  98. GRB 091208B: Keck HIRES redshift confirmation
  99. GRB 091208B: GROND observations
  100. GRB091208B: Swift/UVOT refined analysis

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