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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

45600 results found.

  1. GRB 051111: Swift-BAT refined analysis
  2. GRB 051109A Optical Observations
  3. GRB 051111A : Lulin BVRI multi band afterglow observation
  4. GRB051111a: SARA Observations
  5. GRB 051111a: IR photometry
  6. GRB 051111: Keck HIRES redshift
  7. GRB 051111A: KAIT optical observations
  8. GRB 051111a: Afterglow fading in Ic
  9. GRB051111: Super-LOTIS Early Detection
  10. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  11. Faulkes Telescope R-band detection of GRB051111
  12. GRB 051103 Milagro GeV/TeV Observations
  13. GRB051111: Swift-BAT detection of a bright burst
  14. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  15. GRB 051008 Tautenburg Supernova Search
  16. GRB 051109B. Radio Observations
  17. GRB 051109A
  18. GRB051109A - radio observations
  19. GRB 051105a: GETS optical limit
  20. GRB 051109b: GETS observation
  21. GRB 051109A: KAIT optical observations
  22. Early RAPTOR measurements of GRB 051109a - the movie.
  23. Konus-Wind observation of GRB 051109A
  24. GRB 051109B: Swift-BAT refined analysis
  25. GRB 051109B: ROTSE-III Optical Limits
  26. GRB 051109A: Swift-UVOT Observations
  27. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  28. GRB051109B: no UVOT source detected
  29. GRB051109B: XRT refined analysis
  30. GRB 051109B : Lulin Optical Observations
  31. GRB 051109A : Lulin BVRI Optical afterglow observation
  32. GRB051109A: further steepening in the X-ray light curve
  33. GRB051109A: XRT refined analysis
  34. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  35. GRB051109B: XRT position
  36. GRB 051109B: Super-LOTIS Observations
  37. GRB 051109B Kiso optical follow-up observation
  38. GRB051105B: REM Optical observation
  39. GRB 051109B: Swift detection of a burst
  40. GRB 051109: HET Optical Spectrum and Absorption Redshift
  41. GRB 051109: PROMPT Detections
  42. GRB 051109: Rc and Ic observations
  43. GRB051109: Early Super-LOTIS Detection
  44. GRB 051109: Swift-BAT refined analysis
  45. GRB 051109a: IR Photometry and Astrometry
  46. GRB 051109a: MDM Observations
  47. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  48. GRB051109: Swift detection of a burst
  49. GRB 051109a: IR Detections
  50. GRB 051109: ROTSE-III Detection of Possible Counterpart
  51. GRB051105B: Swift/XRT upper limit
  52. GRB051105B: Swift/UVOT upper limit
  53. GRB051103: optical observations
  54. GRB 051103, optical observations
  55. GRB051103: MASTER: OT limit and host galaxy candidates
  56. GRB051028: Swift-XRT refined analysis
  57. GRB 051105a, observation from Naini Tal and OSN
  58. GRB 051105A, 2nd epoch optical observations
  59. GRB 051105a: MDM Observations
  60. GRB 051105A: TNG optical observations
  61. GRB051105A: Swift/UVOT Observations
  62. GRB 051105A, radio observations
  63. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  64. GRB 051105A, optical observations
  65. XRT observations of GRB 051105A
  66. GRB 051105: Swift-BAT improved refined analysis
  67. GRB 051105b: ART optical limits
  68. GRB051105B - A long GRB detected by INTEGRAL
  69. GRB 051105B (INTEGRAL 2701): Optical observation
  70. GRB 051105: Swift-BAT refined analysis
  71. GRB 051105: Optical limit
  72. GRB 051105: Swift detection of a short burst
  73. IBAS Alert 2700: Not a GRB
  74. GRB 051016B host spectroscopy and redshift
  75. GRB051016B: optical observation
  76. Recent GRB UBVRcIc field photometry
  77. Konus-Wind observation of GRB 051028
  78. GRB 051022: RTT150 optical observations
  79. GRB 051021A: RTT150 optical observations
  80. GRB051028 SARA Observation
  81. GRB051028: optical observations
  82. GRB051028: Swift/UVOT upper limits
  83. GRB051028: confirmation of the afterglow
  84. GRB051028: WHT optical candidate
  85. GRB051028: Swift XRT Position
  86. GRB051028:MASTER observations
  87. GRB 051028 (=H3951): A GRB localized by HETE
  88. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  89. GRB051022: Swift XRT measurement of jet break
  90. SGR 1806-20: continued moderate activity seen with INTEGRAL
  91. GRB051021B: Swift/UVOT Upper limits
  92. GRB 051021, Optical Observations
  93. GRB 051022: XRT Refined Spectral and Temporal Analysis
  94. GRB 051022, refined optical astrometry
  95. Chandra Observations of GRB 051022
  96. GRB051012: Swift-XRT analysis
  97. GRB 051022 Chandra Observations scheduled
  98. GRB051021B: Swift XRT refined analysis
  99. GRB051021a: optical observations
  100. GRB 051022: WSRT Radio Detection

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