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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19089 results found.

  1. GRB 051221: Swift detection of a bright short burst
  2. Swift detection of an RS CVn flare star
  3. GRB051211A: possible optical candidate
  4. GRB 051215: near-infrared observations
  5. GRB051215 - SDSS pre-burst observations
  6. GRB 051215: Swift detection of a possible burst
  7. GRB 051211B, optical observation
  8. GRB 051211A: Swift/UVOT upper limits
  9. GRB 051211B: Swift/UVOT upper limits
  10. GRB 051211A,optical observation
  11. GRB 051211B: Swift XRT confirmation of the afterglow
  12. GRB051211B: Liverpool Telescope observation
  13. GRB051211b: P60 Observations
  14. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  15. GRB 051210: Swift/UVOT upper limits
  16. GRB 051210: Magellan Imaging
  17. GRB 051211: TAROT optical limits
  18. GRB 051211B: a possible optical detection by TAROT
  19. GRB 051211B: a long GRB detected by INTEGRAL
  20. GRB 051211:IAC80 optical observations
  21. GRB 051210: SALT detection limit
  22. GRB 051210: FRAM early limit
  23. GRB 051210: Swift-BAT refined analysis of a short burst
  24. GRB051210: Swift UVOT Observation
  25. GRB 051210: A short GRB in a cluster?
  26. GRB 051210: Swift detection of a burst
  27. An extraordinary long burst on December 3 from SGR1806-20
  28. GRB051117b: No Swift/UVOT Detection
  29. GRB 051117A: Swift/UVOT Detection of an Afterglow
  30. GRB 051117B: R and I observations of possible host galaxy
  31. GRB 051117B: Refined analysis of the Swift-BAT burst
  32. GRB 051117B,optical observation
  33. GRB 051117: Swift detection of a bright burst
  34. GRB051114: results of the Swift-XRT observation
  35. GRB 051109B : Nainital upper limits
  36. GRB 051114: Radio Observations
  37. GRB050925: analysis of the XMM-Newton observation
  38. GRB 051111: Radio afterglow
  39. GRB051103: Radio Observations
  40. GRB 051109A Milagro GeV/TeV Observations
  41. GRB051111: Swift/UVOT Observations
  42. GRB 051109A Optical Observations
  43. GRB 051111a: IR photometry
  44. GRB 051109B. Radio Observations
  45. GRB 051109A
  46. GRB051109A - radio observations
  47. GRB 051109A: Swift-UVOT Observations
  48. GRB051109B: no UVOT source detected
  49. GRB 051109B: Super-LOTIS Observations
  50. GRB051105B: REM Optical observation
  51. GRB 051109: Rc and Ic observations
  52. GRB 051109a: IR Photometry and Astrometry
  53. GRB051109: Swift detection of a burst
  54. GRB 051109a: IR Detections
  55. GRB051105B: Swift/XRT upper limit
  56. GRB051105B: Swift/UVOT upper limit
  57. GRB051103: optical observations
  58. GRB 051105a, observation from Naini Tal and OSN
  59. GRB 051105a: MDM Observations
  60. GRB 051105A: TNG optical observations
  61. GRB051105A: Swift/UVOT Observations
  62. GRB 051105A, radio observations
  63. XRT observations of GRB 051105A
  64. GRB 051105: Swift-BAT improved refined analysis
  65. GRB 051105: Swift detection of a short burst
  66. Recent GRB UBVRcIc field photometry
  67. GRB051028 SARA Observation
  68. GRB051028: Swift/UVOT upper limits
  69. GRB051028: Swift XRT Position
  70. SGR 1806-20: continued moderate activity seen with INTEGRAL
  71. GRB051021B: Swift/UVOT Upper limits
  72. GRB 051021, Optical Observations
  73. GRB051012: Swift-XRT analysis
  74. GRB 051022: Swift/UVOT Upper Limits
  75. GRB051022: Radio Counterpart
  76. GRB051022: IR observations
  77. GRB051021A: Swift XRT refined analysis
  78. GRB051022: Optical Observations
  79. GRB051021b: Magellan IR Imaging
  80. GRB051022: Swift XRT Position
  81. GRB 051021: P200 Ks Observations
  82. GRB 051022 (=H3950): SXC Flight Localization is Valid
  83. GRB051021: Swift/UVOT Upper Limits
  84. GRB 051022: SSO40 Optical Observations
  85. GRB051022,optical observation
  86. GRB 051021,optical observation
  87. GRB 051021B: Swift detection of a burst
  88. Swift-BAT triggered on a posible CR Shower or possible GRB
  89. Afterglow candidate of GRB 051016B observed at Lulin
  90. GRB 051016A: Swift/UVOT upper limits
  91. GRB 051016B: refined analysis of the Swift/XRT data
  92. GRB 051016B: Swift/UVOT detection
  93. GRB 051016B,optical observation
  94. GRB 051016B: Swift detection of a soft burst
  95. GRB051016 XMM-Newton observation
  96. GRB051016: Swift XRT refined analysis.
  97. GRB 051016: PROMPT Observations
  98. GRB051016: Swift detection of a burst
  99. GRB051006: optical observations
  100. GRB 051012: Swift-BAT detection of burst yesterday

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