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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"

36342 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. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  5. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  6. GRB 051211B: optical afterglow
  7. Swift detection of an RS CVn flare star
  8. GRB051211A: possible optical candidate
  9. Swift Trigger 172767 is not a GRB
  10. GRB 051215: near-infrared observations
  11. GRB051215 - SDSS pre-burst observations
  12. GRB 051215: Swift detection of a possible burst
  13. GRB 051215: A short GRB in a cluster?
  14. GRB051105: optical observations
  15. GRB 051213: Swift-BAT refined analysis
  16. GRB 051211B, optical observation
  17. GRB 051213: Swift-BAT detection of a burst
  18. GRB 051211a: RTT150 optical observations
  19. GRB051211B, RBO optical observations
  20. GRB 051211A: Swift/UVOT upper limits
  21. GRB 051211B: Swift/UVOT upper limits - correction
  22. GRB 051211B: Swift/UVOT upper limits
  23. GRB 051211A,optical observation
  24. GRB 051211B: Swift XRT confirmation of the afterglow
  25. GRB051211B: Liverpool Telescope observation
  26. GRB 051211b: RTT150 optical observations
  27. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  28. GRB 051211B: Swift XRT Observations
  29. GRB 051210: Swift/UVOT upper limits
  30. GRB 051210: Magellan Imaging
  31. GRB 051211: TAROT optical limits
  32. GRB 051211B: a possible optical detection by TAROT
  33. GRB 051211B: a long GRB detected by INTEGRAL
  34. GRB 051211: Swift XRT upper limit
  35. GRB 051211:IAC80 optical observations
  36. HETE SXC localization of GRB 051211 (=H3979)
  37. GRB 051210: Optical imaging from Las Campanas
  38. GRB 051210: SALT detection limit
  39. GRB 051210: BAT further refined analysis of the short burst
  40. GRB 051210: Swift XRT refined analysis
  41. GRB 051210: FRAM early limit
  42. GRB 051210: Swift-BAT refined analysis of a short burst
  43. GRB 051210: A short GRB in a cluster?
  44. GRB 051210: Swift detection of a burst
  45. IPN observations of SGR1806-20
  46. An extraordinary long burst on December 3 from SGR1806-20
  47. IBAS Alert 2706 : not a real GRB
  48. GRB051117B: optical observation
  49. GRB051111: optical observaion
  50. Swift-BAT trigger 165579 is not a GRB
  51. GRB 051127: Swift-BAT detection of a possible burst
  52. GRB051117b: No Swift/UVOT Detection
  53. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  54. GRB 051117A: Swift/UVOT Detection of an Afterglow
  55. GRB051111: Suzaku WAM observation of the prompt emission
  56. GRB051008: Suzaku WAM observation of the prompt emission
  57. GRB 051109B: GAO 150cm telescope Optical limit
  58. GRB 051109A : GAO 150cm telescope Rc-band detection
  59. GRB 051021 Optical Observations
  60. GRB 051117B: MARGE Optical Limits
  61. GRB 051117A and B: Radio Observations
  62. GRB 051117B: R and I observations of possible host galaxy
  63. GRB 051117b: NIR observations
  64. GRB 051117A: Refined analysis of the Swift-BAT burst
  65. GRB 051117B: Refined analysis of the Swift-BAT burst
  66. GRB 051117B,optical observation
  67. GRB 051117B: Lulin R and I band observation
  68. GRB 051117B: Optical observations
  69. GRB 051117B: ROTSE-III Optical Limits
  70. GRB 051117B: Swift detection of a burst
  71. GRB 051117: Swift detection of a bright burst
  72. GRB 051028 Optical Observations
  73. GRB 051109B : Nainital upper limits
  74. GRB 051114: Radio Observations
  75. GRB 051114: Swift-BAT refined analysis
  76. GRB051109A optical observations
  77. GRB 051114: Swift-BAT detection of a short burst
  78. GRB 051111: Further spectroscopic analysis
  79. GRB 051111: Radio afterglow
  80. GRB 051113: Swift-BAT refined analysis
  81. GRB 051113: Swift-BAT detection of a burst
  82. GRB 051111: AEOS optical observations
  83. GRB051103: Radio Observations
  84. GRB 051109A Milagro GeV/TeV Observations
  85. GRB/SGR 050925: XMM-Newton ToO observation
  86. GRB051111: Swift/UVOT Observations
  87. GRB 051111A : R-band temporal decay index based on Lulin
  88. GRB 051111: Swift-BAT refined analysis
  89. GRB 051109A Optical Observations
  90. GRB 051111A : Lulin BVRI multi band afterglow observation
  91. GRB051111a: SARA Observations
  92. GRB 051111a: IR photometry
  93. GRB 051111: Keck HIRES redshift
  94. GRB 051111A: KAIT optical observations
  95. GRB 051111a: Afterglow fading in Ic
  96. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  97. GRB 051103 Milagro GeV/TeV Observations
  98. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  99. GRB 051008 Tautenburg Supernova Search
  100. GRB 051109B. Radio Observations

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