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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"

37911 results found.

  1. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  2. GRB 051221: IR Observations at GRB+1hr
  3. GRB 051221: Swift detection of a bright short burst
  4. Refined analysis of the SWIFT J1626.6-5156
  5. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  6. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  7. GRB 051211B: optical afterglow
  8. Swift detection of an RS CVn flare star
  9. GRB051211A: possible optical candidate
  10. Swift Trigger 172767 is not a GRB
  11. GRB 051215: near-infrared observations
  12. GRB051215 - SDSS pre-burst observations
  13. GRB 051215: Swift detection of a possible burst
  14. GRB 051215: A short GRB in a cluster?
  15. GRB051105: optical observations
  16. GRB 051213: Swift-BAT refined analysis
  17. GRB051211B: XRT refined analysis
  18. GRB 051211B, optical observation
  19. GRB 051213: Swift-BAT detection of a burst
  20. GRB 051211a: RTT150 optical observations
  21. GRB051211B, RBO optical observations
  22. GRB 051211A: Swift/UVOT upper limits
  23. GRB 051211B: Swift/UVOT upper limits - correction
  24. GRB 051211B: Swift/UVOT upper limits
  25. GRB 051211A,optical observation
  26. GRB 051211B: Swift XRT confirmation of the afterglow
  27. GRB051211B: Liverpool Telescope observation
  28. GRB 051211b: RTT150 optical observations
  29. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  30. GRB 051211B: Swift XRT Observations
  31. GRB 051210: Swift/UVOT upper limits
  32. GRB 051210: Magellan Imaging
  33. GRB 051211: TAROT optical limits
  34. GRB 051211B: a possible optical detection by TAROT
  35. GRB 051211B: a long GRB detected by INTEGRAL
  36. GRB 051211: Swift XRT upper limit
  37. GRB 051211:IAC80 optical observations
  38. HETE SXC localization of GRB 051211 (=H3979)
  39. GRB 051210: Optical imaging from Las Campanas
  40. GRB 051210: SALT detection limit
  41. GRB 051210: BAT further refined analysis of the short burst
  42. GRB 051210: Swift XRT refined analysis
  43. GRB 051210: FRAM early limit
  44. GRB 051210: Swift-BAT refined analysis of a short burst
  45. GRB051210: Swift UVOT Observation
  46. GRB 051210: A short GRB in a cluster?
  47. GRB 051210: Swift detection of a burst
  48. IPN observations of SGR1806-20
  49. Swift XRT positions
  50. An extraordinary long burst on December 3 from SGR1806-20
  51. IBAS Alert 2706 : not a real GRB
  52. Swift UVOT Calibration Documentation
  53. GRB051117B: optical observation
  54. GRB051111: optical observaion
  55. Swift-BAT trigger 165579 is not a GRB
  56. GRB 051127: Swift-BAT detection of a possible burst
  57. GRB051117B: Swift XRT refined analysis
  58. GRB051117b: No Swift/UVOT Detection
  59. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  60. GRB 051117A: Swift/UVOT Detection of an Afterglow
  61. GRB051111: Suzaku WAM observation of the prompt emission
  62. GRB051111: Rc optical observations
  63. GRB051008: Suzaku WAM observation of the prompt emission
  64. GRB 051109B: GAO 150cm telescope Optical limit
  65. GRB 051109A : GAO 150cm telescope Rc-band detection
  66. GRB 051021 Optical Observations
  67. GRB 051117B: MARGE Optical Limits
  68. GRB 051117A and B: Radio Observations
  69. GRB 051117B: R and I observations of possible host galaxy
  70. GRB 051117b: NIR observations
  71. GRB 051117A: Refined analysis of the Swift-BAT burst
  72. GRB 051117B: Refined analysis of the Swift-BAT burst
  73. GRB051117A : XRT refined analysis
  74. GRB 051117B,optical observation
  75. GRB 051117B: Lulin R and I band observation
  76. GRB 051117B: Optical observations
  77. GRB 051117B: ROTSE-III Optical Limits
  78. GRB051117B: Swift XRT position
  79. GRB 051117B: Swift detection of a burst
  80. GRB 051117: Swift detection of a bright burst
  81. GRB051114: results of the Swift-XRT observation
  82. GRB 051028 Optical Observations
  83. GRB 051109B : Nainital upper limits
  84. GRB 051114: Radio Observations
  85. GRB 051114: Swift-BAT refined analysis
  86. GRB050925: analysis of the XMM-Newton observation
  87. GRB051109A optical observations
  88. GRB 051114: Swift-BAT detection of a short burst
  89. GRB 051111: Further spectroscopic analysis
  90. GRB 051111: Radio afterglow
  91. GRB 051113: Swift-BAT refined analysis
  92. GRB 051113: Swift-BAT detection of a burst
  93. GRB 051111: AEOS optical observations
  94. GRB051103: Radio Observations
  95. GRB 051109A Milagro GeV/TeV Observations
  96. GRB/SGR 050925: XMM-Newton ToO observation
  97. GRB051111: Swift/UVOT Observations
  98. GRB 051111A : R-band temporal decay index based on Lulin
  99. GRB051111: XRT preliminary analysis
  100. GRB 051111: Swift-BAT refined analysis

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