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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"

43612 results found.

  1. GRB 051211A: Swift/UVOT upper limits
  2. GRB 051211B: Swift/UVOT upper limits - correction
  3. GRB 051211B: Swift/UVOT upper limits
  4. GRB 051211A,optical observation
  5. GRB 051211B: Swift XRT confirmation of the afterglow
  6. GRB051211B: Liverpool Telescope observation
  7. GRB 051211b: RTT150 optical observations
  8. GRB051211b: P60 Observations
  9. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  10. GRB 051211B: Swift XRT Observations
  11. GRB 051210: Swift/UVOT upper limits
  12. GRB 051210: Magellan Imaging
  13. GRB 051211: TAROT optical limits
  14. GRB 051211B: a possible optical detection by TAROT
  15. GRB 051211B: a long GRB detected by INTEGRAL
  16. GRB 051211: Swift XRT upper limit
  17. GRB 051211:IAC80 optical observations
  18. HETE SXC localization of GRB 051211 (=H3979)
  19. GRB 051210: Optical imaging from Las Campanas
  20. GRB 051210: SALT detection limit
  21. GRB 051210: BAT further refined analysis of the short burst
  22. GRB 051210: Swift XRT refined analysis
  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. IPN observations of SGR1806-20
  28. Swift XRT positions
  29. An extraordinary long burst on December 3 from SGR1806-20
  30. IBAS Alert 2706 : not a real GRB
  31. Possible resuming of the SGR 1806-20 activity
  32. Swift UVOT Calibration Documentation
  33. GRB051111: optical observaion
  34. Swift-BAT trigger 165579 is not a GRB
  35. GRB 051127: Swift-BAT detection of a possible burst
  36. GRB051117B: Swift XRT refined analysis
  37. GRB051117b: No Swift/UVOT Detection
  38. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  39. GRB 051117A: Swift/UVOT Detection of an Afterglow
  40. GRB051111: Suzaku WAM observation of the prompt emission
  41. GRB051111: Rc optical observations
  42. GRB051008: Suzaku WAM observation of the prompt emission
  43. GRB 051109A : GAO 150cm telescope Rc-band detection
  44. GRB 051021 Optical Observations
  45. GRB 051117B: MARGE Optical Limits
  46. GRB 051117A and B: Radio Observations
  47. GRB 051117B: R and I observations of possible host galaxy
  48. GRB 051117b: NIR observations
  49. GRB 051117A: Refined analysis of the Swift-BAT burst
  50. GRB 051117B: Refined analysis of the Swift-BAT burst
  51. GRB051117A : XRT refined analysis
  52. GRB 051117B,optical observation
  53. GRB 051117B: Lulin R and I band observation
  54. GRB 051117B: Optical observations
  55. GRB 051117B: ROTSE-III Optical Limits
  56. GRB051117B: Swift XRT position
  57. GRB 051117B: Swift detection of a burst
  58. GRB 051117: Swift detection of a bright burst
  59. GRB051114: results of the Swift-XRT observation
  60. GRB 051028 Optical Observations
  61. GRB 051109B : Nainital upper limits
  62. GRB 051114: Radio Observations
  63. GRB 051114: Swift-BAT refined analysis
  64. GRB050925: analysis of the XMM-Newton observation
  65. GRB051109A optical observations
  66. GRB 051114: Swift-BAT detection of a short burst
  67. GRB 051111: Further spectroscopic analysis
  68. GRB 051111: Radio afterglow
  69. GRB 051113: Swift-BAT refined analysis
  70. GRB 051113: Swift-BAT detection of a burst
  71. GRB 051111: AEOS optical observations
  72. GRB051103: Radio Observations
  73. GRB 051109A Milagro GeV/TeV Observations
  74. GRB/SGR 050925: XMM-Newton ToO observation
  75. GRB051111: Swift/UVOT Observations
  76. GRB051111: XRT preliminary analysis
  77. GRB 051111: Swift-BAT refined analysis
  78. GRB 051109A Optical Observations
  79. GRB051111a: SARA Observations
  80. GRB 051111a: IR photometry
  81. GRB 051111: Keck HIRES redshift
  82. GRB 051111A: KAIT optical observations
  83. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  84. Faulkes Telescope R-band detection of GRB051111
  85. GRB 051103 Milagro GeV/TeV Observations
  86. GRB051111: Swift-BAT detection of a bright burst
  87. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  88. GRB 051008 Tautenburg Supernova Search
  89. GRB 051109B. Radio Observations
  90. GRB 051109A
  91. GRB051109A - radio observations
  92. GRB 051105a: GETS optical limit
  93. GRB 051109b: GETS observation
  94. GRB 051109A: KAIT optical observations
  95. Early RAPTOR measurements of GRB 051109a - the movie.
  96. Konus-Wind observation of GRB 051109A
  97. GRB 051109B: Swift-BAT refined analysis
  98. GRB 051109B: ROTSE-III Optical Limits
  99. GRB 051109A: Swift-UVOT Observations
  100. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large

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