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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"

32720 results found.

  1. GRB 051221A: Chandra Afterglow Position
  2. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  3. GRB 051221B: ROTSE-III Optical Limits
  4. GRB 051221B: TAROT optical limits
  5. GRB 051221A: WSRT Radio Observations
  6. GRB 051221: Redshift from Gemini
  7. GRB 051221: Continued fading of optical afterglow
  8. GRB 051221B: Refined analysis of the Swift-BAT burst
  9. Possible GRB 051221B: MDM Optical Detection
  10. GRB 051221A: RAPTOR Fading Counterpart Constraint
  11. Possible GRB 051221B: Swift XRT position
  12. GRB 051221: Discovery of fading optical afterglow
  13. GRB 051221: Swift XRT refined analysis
  14. GRB 051221: Swift/UVOT upper limits
  15. GRB 051221: Possible nearby cluster
  16. GRB 051221: Correction to GCN #4368
  17. GRB 051221: Gemini observations
  18. GRB 051221: Improved astrometry of the IR counterpart
  19. GRB051221: K-band source
  20. GRB 051221: XRT position
  21. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  22. GRB 051221: IR Observations at GRB+1hr
  23. Refined analysis of the SWIFT J1626.6-5156
  24. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  25. GRB051211A (=H3979): Refined Analysis
  26. GRB 051211B: optical afterglow
  27. GRB051211A: possible optical candidate
  28. Swift Trigger 172767 is not a GRB
  29. GRB 051215: near-infrared observations
  30. GRB051215 - SDSS pre-burst observations
  31. GRB 051215: A short GRB in a cluster?
  32. GRB051211B: Probable radio afterglow
  33. GRB051105: optical observations
  34. GRB 051213: Swift-BAT refined analysis
  35. GRB051211B: XRT refined analysis
  36. GRB051211B, RBO optical observations
  37. GRB 051211A: Swift/UVOT upper limits
  38. GRB 051211B: Swift/UVOT upper limits - correction
  39. GRB 051211B: Swift/UVOT upper limits
  40. GRB 051211A,optical observation
  41. GRB 051211B: Swift XRT confirmation of the afterglow
  42. GRB051211B: Liverpool Telescope observation
  43. GRB 051211b: RTT150 optical observations
  44. GRB051211b: P60 Observations
  45. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  46. GRB 051211B: Swift XRT Observations
  47. GRB 051210: Swift/UVOT upper limits
  48. GRB 051210: Magellan Imaging
  49. GRB 051211: TAROT optical limits
  50. GRB 051211B: a possible optical detection by TAROT
  51. GRB 051211: Swift XRT upper limit
  52. HETE SXC localization of GRB 051211 (=H3979)
  53. GRB 051210: SALT detection limit
  54. GRB 051210: Swift XRT refined analysis
  55. GRB 051210: FRAM early limit
  56. GRB 051210: Swift-BAT refined analysis of a short burst
  57. GRB051210: Swift UVOT Observation
  58. GRB 051210: A short GRB in a cluster?
  59. IPN observations of SGR1806-20
  60. Swift XRT positions
  61. An extraordinary long burst on December 3 from SGR1806-20
  62. GRB051117B: optical observation
  63. GRB051111: optical observaion
  64. Swift-BAT trigger 165579 is not a GRB
  65. GRB051117b: No Swift/UVOT Detection
  66. GRB051111: Rc optical observations: correction
  67. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  68. GRB 051117A: Swift/UVOT Detection of an Afterglow
  69. GRB051111: Rc optical observations
  70. GRB051008: Suzaku WAM observation of the prompt emission
  71. GRB 051109B: GAO 150cm telescope Optical limit
  72. GRB 051109A : GAO 150cm telescope Rc-band detection
  73. GRB 051021 Optical Observations
  74. GRB 051117B: MARGE Optical Limits
  75. GRB 051117A and B: Radio Observations
  76. GRB 051117B: R and I observations of possible host galaxy
  77. GRB 051117b: NIR observations
  78. GRB 051117A: Refined analysis of the Swift-BAT burst
  79. GRB 051117B: Refined analysis of the Swift-BAT burst
  80. GRB051117A : XRT refined analysis
  81. GRB 051117B: Lulin R and I band observation
  82. GRB 051117B: Optical observations
  83. GRB 051117B: ROTSE-III Optical Limits
  84. GRB051114: results of the Swift-XRT observation
  85. GRB 051028 Optical Observations
  86. GRB 051109B : Nainital upper limits
  87. GRB 051114: Radio Observations
  88. GRB 051114: Swift-BAT refined analysis
  89. GRB 051114: Swift-BAT detection of a short burst
  90. GRB 051111: Further spectroscopic analysis
  91. GRB 051111: Radio afterglow
  92. GRB 051113: Swift-BAT refined analysis
  93. GRB051103: Radio Observations
  94. GRB 051109A Milagro GeV/TeV Observations
  95. GRB/SGR 050925: XMM-Newton ToO observation
  96. GRB051111: Swift/UVOT Observations
  97. GRB 051111A : R-band temporal decay index based on Lulin
  98. GRB051111: XRT preliminary analysis
  99. GRB 051111: Swift-BAT refined analysis
  100. GRB 051109A Optical Observations

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