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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"

36367 results found.

  1. GRB 051221A: Detection at 251nm with Swift UVOT
  2. GRB 051221A: Chandra Afterglow Position
  3. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  4. GRB 051221B: ROTSE-III Optical Limits
  5. GRB 051221B: TAROT optical limits
  6. GRB 051221A: WSRT Radio Observations
  7. GRB 051221: Redshift from Gemini
  8. GRB 051221: Continued fading of optical afterglow
  9. GRB 051221B: Refined analysis of the Swift-BAT burst
  10. Possible GRB 051221B: MDM Optical Detection
  11. GRB 051221A: RAPTOR Fading Counterpart Constraint
  12. GRB 051221B: BOOTES optical observations.
  13. Possible GRB 051221B: Swift XRT position
  14. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  15. Swift-BAT detection of a possible burst
  16. GRB 051221: Discovery of fading optical afterglow
  17. GRB 051221: Swift XRT refined analysis
  18. GRB 051221: Swift/UVOT upper limits
  19. GRB 051221: Possible nearby cluster
  20. GRB 051221: No variability in Gemini data
  21. GRB 051221: Correction to GCN #4368
  22. GRB 051221: Gemini observations
  23. GRB 051221: Improved astrometry of the IR counterpart
  24. GRB051221: K-band source
  25. GRB 051221: XRT position
  26. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  27. GRB 051221: IR Observations at GRB+1hr
  28. GRB 051221: Swift detection of a bright short burst
  29. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  30. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  31. GRB 051211B: optical afterglow
  32. Swift detection of an RS CVn flare star
  33. GRB051211A: possible optical candidate
  34. Swift Trigger 172767 is not a GRB
  35. GRB 051215: near-infrared observations
  36. GRB051215 - SDSS pre-burst observations
  37. GRB 051215: Swift detection of a possible burst
  38. GRB 051215: A short GRB in a cluster?
  39. GRB051105: optical observations
  40. GRB 051213: Swift-BAT refined analysis
  41. GRB 051211B, optical observation
  42. GRB 051213: Swift-BAT detection of a burst
  43. GRB 051211a: RTT150 optical observations
  44. GRB051211B, RBO optical observations
  45. GRB 051211A: Swift/UVOT upper limits
  46. GRB 051211B: Swift/UVOT upper limits - correction
  47. GRB 051211B: Swift/UVOT upper limits
  48. GRB 051211A,optical observation
  49. GRB 051211B: Swift XRT confirmation of the afterglow
  50. GRB051211B: Liverpool Telescope observation
  51. GRB 051211b: RTT150 optical observations
  52. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  53. GRB 051211B: Swift XRT Observations
  54. GRB 051210: Swift/UVOT upper limits
  55. GRB 051210: Magellan Imaging
  56. GRB 051211: TAROT optical limits
  57. GRB 051211B: a possible optical detection by TAROT
  58. GRB 051211B: a long GRB detected by INTEGRAL
  59. GRB 051211: Swift XRT upper limit
  60. GRB 051211:IAC80 optical observations
  61. HETE SXC localization of GRB 051211 (=H3979)
  62. GRB 051210: Optical imaging from Las Campanas
  63. GRB 051210: SALT detection limit
  64. GRB 051210: BAT further refined analysis of the short burst
  65. GRB 051210: Swift XRT refined analysis
  66. GRB 051210: FRAM early limit
  67. GRB 051210: Swift-BAT refined analysis of a short burst
  68. GRB 051210: A short GRB in a cluster?
  69. GRB 051210: Swift detection of a burst
  70. IPN observations of SGR1806-20
  71. An extraordinary long burst on December 3 from SGR1806-20
  72. IBAS Alert 2706 : not a real GRB
  73. GRB051117B: optical observation
  74. GRB051111: optical observaion
  75. Swift-BAT trigger 165579 is not a GRB
  76. GRB 051127: Swift-BAT detection of a possible burst
  77. GRB051117b: No Swift/UVOT Detection
  78. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  79. GRB 051117A: Swift/UVOT Detection of an Afterglow
  80. GRB051111: Suzaku WAM observation of the prompt emission
  81. GRB051008: Suzaku WAM observation of the prompt emission
  82. GRB 051109B: GAO 150cm telescope Optical limit
  83. GRB 051109A : GAO 150cm telescope Rc-band detection
  84. GRB 051021 Optical Observations
  85. GRB 051117B: MARGE Optical Limits
  86. GRB 051117A and B: Radio Observations
  87. GRB 051117B: R and I observations of possible host galaxy
  88. GRB 051117b: NIR observations
  89. GRB 051117A: Refined analysis of the Swift-BAT burst
  90. GRB 051117B: Refined analysis of the Swift-BAT burst
  91. GRB 051117B,optical observation
  92. GRB 051117B: Lulin R and I band observation
  93. GRB 051117B: Optical observations
  94. GRB 051117B: ROTSE-III Optical Limits
  95. GRB 051117B: Swift detection of a burst
  96. GRB 051117: Swift detection of a bright burst
  97. GRB 051028 Optical Observations
  98. GRB 051109B : Nainital upper limits
  99. GRB 051114: Radio Observations
  100. GRB 051114: Swift-BAT refined analysis

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