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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.

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

43601 results found.

  1. GRB 051210: Magellan Imaging
  2. GRB 051211: TAROT optical limits
  3. GRB 051211B: a possible optical detection by TAROT
  4. GRB 051211B: a long GRB detected by INTEGRAL
  5. GRB 051211: Swift XRT upper limit
  6. GRB 051211:IAC80 optical observations
  7. HETE SXC localization of GRB 051211 (=H3979)
  8. GRB 051210: Optical imaging from Las Campanas
  9. GRB 051210: SALT detection limit
  10. GRB 051210: BAT further refined analysis of the short burst
  11. GRB 051210: Swift XRT refined analysis
  12. GRB 051210: Swift-BAT refined analysis of a short burst
  13. GRB051210: Swift UVOT Observation
  14. GRB 051210: A short GRB in a cluster?
  15. GRB 051210: Swift detection of a burst
  16. IPN observations of SGR1806-20
  17. Swift XRT positions
  18. An extraordinary long burst on December 3 from SGR1806-20
  19. IBAS Alert 2706 : not a real GRB
  20. Possible resuming of the SGR 1806-20 activity
  21. Swift UVOT Calibration Documentation
  22. GRB051111: optical observaion
  23. Swift-BAT trigger 165579 is not a GRB
  24. GRB 051127: Swift-BAT detection of a possible burst
  25. GRB051117B: Swift XRT refined analysis
  26. GRB051117b: No Swift/UVOT Detection
  27. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  28. GRB 051117A: Swift/UVOT Detection of an Afterglow
  29. GRB051111: Suzaku WAM observation of the prompt emission
  30. GRB051111: Rc optical observations
  31. GRB051008: Suzaku WAM observation of the prompt emission
  32. GRB 051109A : GAO 150cm telescope Rc-band detection
  33. GRB 051021 Optical Observations
  34. GRB 051117B: MARGE Optical Limits
  35. GRB 051117A and B: Radio Observations
  36. GRB 051117B: R and I observations of possible host galaxy
  37. GRB 051117b: NIR observations
  38. GRB 051117A: Refined analysis of the Swift-BAT burst
  39. GRB 051117B: Refined analysis of the Swift-BAT burst
  40. GRB051117A : XRT refined analysis
  41. GRB 051117B,optical observation
  42. GRB 051117B: Lulin R and I band observation
  43. GRB 051117B: Optical observations
  44. GRB 051117B: ROTSE-III Optical Limits
  45. GRB051117B: Swift XRT position
  46. GRB 051117B: Swift detection of a burst
  47. GRB 051117: Swift detection of a bright burst
  48. GRB051114: results of the Swift-XRT observation
  49. GRB 051028 Optical Observations
  50. GRB 051109B : Nainital upper limits
  51. GRB 051114: Radio Observations
  52. GRB 051114: Swift-BAT refined analysis
  53. GRB050925: analysis of the XMM-Newton observation
  54. GRB051109A optical observations
  55. GRB 051114: Swift-BAT detection of a short burst
  56. GRB 051111: Further spectroscopic analysis
  57. GRB 051111: Radio afterglow
  58. GRB 051113: Swift-BAT refined analysis
  59. GRB 051113: Swift-BAT detection of a burst
  60. GRB 051111: AEOS optical observations
  61. GRB051103: Radio Observations
  62. GRB 051109A Milagro GeV/TeV Observations
  63. GRB/SGR 050925: XMM-Newton ToO observation
  64. GRB051111: Swift/UVOT Observations
  65. GRB051111: XRT preliminary analysis
  66. GRB 051111: Swift-BAT refined analysis
  67. GRB 051109A Optical Observations
  68. GRB051111a: SARA Observations
  69. GRB 051111a: IR photometry
  70. GRB 051111: Keck HIRES redshift
  71. GRB 051111A: KAIT optical observations
  72. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  73. Faulkes Telescope R-band detection of GRB051111
  74. GRB 051103 Milagro GeV/TeV Observations
  75. GRB051111: Swift-BAT detection of a bright burst
  76. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  77. GRB 051008 Tautenburg Supernova Search
  78. GRB 051109B. Radio Observations
  79. GRB 051109A
  80. GRB051109A - radio observations
  81. GRB 051105a: GETS optical limit
  82. GRB 051109b: GETS observation
  83. GRB 051109A: KAIT optical observations
  84. Early RAPTOR measurements of GRB 051109a - the movie.
  85. Konus-Wind observation of GRB 051109A
  86. GRB 051109B: Swift-BAT refined analysis
  87. GRB 051109B: ROTSE-III Optical Limits
  88. GRB 051109A: Swift-UVOT Observations
  89. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  90. GRB051109B: no UVOT source detected
  91. GRB051109B: XRT refined analysis
  92. GRB 051109A : Lulin BVRI Optical afterglow observation
  93. GRB051109A: further steepening in the X-ray light curve
  94. GRB051109A: XRT refined analysis
  95. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  96. GRB051109B: XRT position
  97. GRB 051109B: Super-LOTIS Observations
  98. GRB051105B: REM Optical observation
  99. GRB 051109B: Swift detection of a burst
  100. GRB 051109: HET Optical Spectrum and Absorption Redshift

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