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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"

41918 results found.

  1. GRB 051227: MDM Observation
  2. GRB 051227: R-band object in the XRT error circle
  3. GRB 051227: Joint Swift-HETE Spectral Analysis
  4. GRB 051227: XRT refined analysis
  5. GRB 051227: Further analysis of the Swift-BAT burst
  6. GRB 051227: Refined analysis of the Swift-BAT burst
  7. GRB051227: SDSS pre-burst observations
  8. GRB 051227, optical observation
  9. GRB 051227: Swift detection of a burst
  10. GRB051117B: optical observation
  11. Konus-Wind observation of GRB 051221A
  12. GRB051221A: Suzaku WAM observation of the prompt emission
  13. GRB 051221A: MDM Optical Observations
  14. GRB051016: analysis of the XMM-Newton observation
  15. GRB 051221A: Detection at 251nm with Swift UVOT
  16. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  17. GRB 051221B: TAROT optical limits
  18. GRB 051221A: WSRT Radio Observations
  19. GRB 051221: Redshift from Gemini
  20. GRB 051221: Continued fading of optical afterglow
  21. GRB 051221B: Refined analysis of the Swift-BAT burst
  22. Possible GRB 051221B: MDM Optical Detection
  23. GRB 051221A: RAPTOR Fading Counterpart Constraint
  24. GRB 051221B: BOOTES optical observations.
  25. Possible GRB 051221B: Swift XRT position
  26. Swift-BAT detection of a possible burst
  27. GRB 051221: Discovery of fading optical afterglow
  28. GRB 051221: Swift XRT refined analysis
  29. GRB 051221: Possible nearby cluster
  30. GRB 051221: Gemini observations
  31. GRB051221: K-band source
  32. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  33. GRB 051221: IR Observations at GRB+1hr
  34. GRB 051221: Swift detection of a bright short burst
  35. Refined analysis of the SWIFT J1626.6-5156
  36. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  37. GRB051211A (=H3979): Refined Analysis
  38. GRB 051211B: optical afterglow
  39. Swift detection of an RS CVn flare star
  40. GRB051211A: possible optical candidate
  41. GRB 051215: near-infrared observations
  42. GRB051215 - SDSS pre-burst observations
  43. GRB 051215: Swift detection of a possible burst
  44. GRB051211B: Probable radio afterglow
  45. GRB051105: optical observations
  46. GRB 051213: Swift-BAT refined analysis
  47. GRB051211B: XRT refined analysis
  48. GRB 051211B, optical observation
  49. GRB 051213: Swift-BAT detection of a burst
  50. GRB 051211a: RTT150 optical observations
  51. GRB051211B, RBO optical observations
  52. GRB 051211A,optical observation
  53. GRB 051211B: Swift XRT confirmation of the afterglow
  54. GRB051211B: Liverpool Telescope observation
  55. GRB 051211b: RTT150 optical observations
  56. GRB051211b: P60 Observations
  57. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  58. GRB 051211B: Swift XRT Observations
  59. GRB 051210: Magellan Imaging
  60. GRB 051211: TAROT optical limits
  61. GRB 051211B: a possible optical detection by TAROT
  62. GRB 051211B: a long GRB detected by INTEGRAL
  63. GRB 051211: Swift XRT upper limit
  64. GRB 051211:IAC80 optical observations
  65. HETE SXC localization of GRB 051211 (=H3979)
  66. GRB 051210: Optical imaging from Las Campanas
  67. GRB 051210: SALT detection limit
  68. GRB 051210: BAT further refined analysis of the short burst
  69. GRB 051210: Swift XRT refined analysis
  70. GRB 051210: FRAM early limit
  71. GRB 051210: A short GRB in a cluster?
  72. GRB 051210: Swift detection of a burst
  73. IPN observations of SGR1806-20
  74. An extraordinary long burst on December 3 from SGR1806-20
  75. Possible resuming of the SGR 1806-20 activity
  76. GRB051117B: optical observation
  77. GRB051111: optical observaion
  78. GRB 051127: Swift-BAT detection of a possible burst
  79. GRB051117B: Swift XRT refined analysis
  80. GRB051111: Rc optical observations: correction
  81. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  82. GRB 051117A: Swift/UVOT Detection of an Afterglow
  83. GRB051111: Suzaku WAM observation of the prompt emission
  84. GRB051111: Rc optical observations
  85. GRB051008: Suzaku WAM observation of the prompt emission
  86. GRB 051109B: GAO 150cm telescope Optical limit
  87. GRB 051021 Optical Observations
  88. GRB 051117B: MARGE Optical Limits
  89. GRB 051117A and B: Radio Observations
  90. GRB 051117B: R and I observations of possible host galaxy
  91. GRB 051117b: NIR observations
  92. GRB 051117A: Refined analysis of the Swift-BAT burst
  93. GRB 051117B: Refined analysis of the Swift-BAT burst
  94. GRB051117A : XRT refined analysis
  95. GRB 051117B,optical observation
  96. GRB 051117B: Lulin R and I band observation
  97. GRB 051117B: Optical observations
  98. GRB 051117B: ROTSE-III Optical Limits
  99. GRB051117B: Swift XRT position
  100. GRB 051117B: Swift detection of a burst

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