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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"

45470 results found.

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

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