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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28050 results found.

  1. GRB 051109B. Radio Observations
  2. GRB 051109A
  3. GRB051109A - radio observations
  4. GRB 051109B: Swift-BAT refined analysis
  5. GRB 051109A: Swift-UVOT Observations
  6. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  7. GRB051109B: no UVOT source detected
  8. GRB051109B: XRT refined analysis
  9. GRB 051109B : Lulin Optical Observations
  10. GRB 051109A : Lulin BVRI Optical afterglow observation
  11. GRB051109A: further steepening in the X-ray light curve
  12. GRB051109A: XRT refined analysis
  13. GRB 051109B: Super-LOTIS Observations
  14. GRB051105B: REM Optical observation
  15. GRB 051109B: Swift detection of a burst
  16. GRB 051109: Rc and Ic observations
  17. GRB 051109: Swift-BAT refined analysis
  18. GRB 051109a: IR Photometry and Astrometry
  19. GRB051109: Swift detection of a burst
  20. GRB 051109a: IR Detections
  21. GRB051105B: Swift/XRT upper limit
  22. GRB051105B: Swift/UVOT upper limit
  23. GRB051103: MASTER: OT limit and host galaxy candidates
  24. GRB051028: Swift-XRT refined analysis
  25. GRB 051105a, observation from Naini Tal and OSN
  26. GRB 051105a: MDM Observations
  27. GRB 051105A: TNG optical observations
  28. GRB051105A: Swift/UVOT Observations
  29. GRB 051105A, radio observations
  30. GRB051103:_MASTER_optical_observations
  31. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  32. GRB 051105A, optical observations
  33. XRT observations of GRB 051105A
  34. GRB 051105b: ART optical limits
  35. GRB 051105B (INTEGRAL 2701): Optical observation
  36. GRB 051105: Swift detection of a short burst
  37. Recent GRB UBVRcIc field photometry
  38. GRB051028 SARA Observation
  39. GRB051028: optical observations
  40. GRB051028: Swift/UVOT upper limits
  41. GRB051028: Swift XRT Position
  42. GRB051028:MASTER observations
  43. GRB051021B: Swift/UVOT Upper limits
  44. GRB 051021, Optical Observations
  45. GRB 051022: XRT Refined Spectral and Temporal Analysis
  46. GRB051012: Swift-XRT analysis
  47. GRB051021B: Swift XRT refined analysis
  48. GRB 051022, mm counterpart
  49. GRB 051022: Swift/UVOT Upper Limits
  50. GRB051022: Radio Counterpart
  51. GRB051022: IR observations
  52. GRB051021A: Swift XRT refined analysis
  53. GRB051022: Optical Observations
  54. GRB051021b: Magellan IR Imaging
  55. GRB 051021, SMARTS optical/IR observations
  56. GRB051022: Swift XRT Position
  57. GRB 051021: P200 Ks Observations
  58. GRB 051022 (=H3950): SXC Flight Localization is Valid
  59. GRB051021: Swift/UVOT Upper Limits
  60. GRB 051021B: Refined analysis of the Swift-BAT burst
  61. GRB 051022: SSO40 Optical Observations
  62. GRB051022,optical observation
  63. GRB 051021,optical observation
  64. GRB 051021B: Swift detection of a burst
  65. GRB 051021 : optical afterglow observation at Lulin
  66. GRB 051021: Optical observations and candidate afterglow
  67. GRB051021.63
  68. GRB051021.6: MASTER optical observation
  69. GRB051021: A GRB Localized by HETE
  70. Swift-BAT triggered on a posible CR Shower or possible GRB
  71. GRB 051016b: Optical limit
  72. Afterglow candidate of GRB 051016B observed at Lulin
  73. GRB 051016A: Swift/UVOT upper limits
  74. GRB 051016B: refined analysis of the Swift/XRT data
  75. GRB 051016B: Swift/UVOT detection
  76. GRB 051016B,optical observation
  77. GRB 051016B : Optical follow-up at Lulin
  78. GRB 051016B: Refined analysis of the Swift-BAT burst
  79. GRB 051016B: Swift detection of a soft burst
  80. GRB 051016: Swift-BAT refined analysis
  81. GRB051016 XMM-Newton observation
  82. GRB051016: Swift XRT refined analysis.
  83. GRB 051016: PROMPT Observations
  84. GRB051016: Swift detection of a burst
  85. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  86. GRB 051012: Swift-BAT detection of burst yesterday
  87. Swift-BAT Trigger 159578 is a possible burst
  88. GRB 051006: Swift/UVOT Upper Limits
  89. GRB051008: optical candidate
  90. GRB 051008 - a low redshift low-luminosity burst?
  91. GRB051011: bright nebulae near error box
  92. GRB051011: MASTER optical observation
  93. GRB051008: Final refined analysis of the Swift-BAT burst
  94. GRB051008: Radio Observation
  95. GRB 051008, optical observations
  96. GRB 051008: early Swift XRT analysis
  97. GRB 051008: Swift UVOT Candidate
  98. GRB 051006: P60 Observations
  99. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  100. GRB 051006: optical observations at Sierra Nevada

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