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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"

36144 results found.

  1. GRB 051111: Keck HIRES redshift
  2. GRB 051111A: KAIT optical observations
  3. GRB 051111a: Afterglow fading in Ic
  4. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  5. GRB 051103 Milagro GeV/TeV Observations
  6. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  7. GRB 051008 Tautenburg Supernova Search
  8. GRB 051109B. Radio Observations
  9. GRB 051109A
  10. GRB051109A - radio observations
  11. GRB 051105a: GETS optical limit
  12. GRB 051109b: GETS observation
  13. GRB 051109A: KAIT optical observations
  14. Early RAPTOR measurements of GRB 051109a - the movie.
  15. Konus-Wind observation of GRB 051109A
  16. GRB 051109B: Swift-BAT refined analysis
  17. GRB 051109B: ROTSE-III Optical Limits
  18. GRB 051109A: Swift-UVOT Observations
  19. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  20. GRB 051109B : Lulin Optical Observations
  21. GRB 051109A : Lulin BVRI Optical afterglow observation
  22. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  23. GRB051109B: XRT position
  24. GRB 051109B: Super-LOTIS Observations
  25. GRB 051109B Kiso optical follow-up observation
  26. GRB 051109B: Swift detection of a burst
  27. GRB 051109: HET Optical Spectrum and Absorption Redshift
  28. GRB 051109: PROMPT Detections
  29. GRB 051109: Rc and Ic observations
  30. GRB 051109: Swift-BAT refined analysis
  31. GRB 051109a: IR Photometry and Astrometry
  32. GRB 051109a: MDM Observations
  33. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  34. GRB 051109a: IR Detections
  35. GRB 051109: ROTSE-III Detection of Possible Counterpart
  36. GRB051105B: Swift/XRT upper limit
  37. GRB051105B: Swift/UVOT upper limit
  38. GRB051103: optical observations
  39. GRB 051103, optical observations
  40. GRB051103: MASTER: OT limit and host galaxy candidates
  41. GRB 051105a, observation from Naini Tal and OSN
  42. GRB 051105A, 2nd epoch optical observations
  43. GRB 051105a: MDM Observations
  44. GRB 051105A: TNG optical observations
  45. GRB051105A: Swift/UVOT Observations
  46. GRB 051105A, radio observations
  47. GRB051103:_MASTER_optical_observations
  48. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  49. GRB 051105A, optical observations
  50. XRT observations of GRB 051105A
  51. GRB 051105: Swift-BAT improved refined analysis
  52. GRB 051105b: ART optical limits
  53. GRB051105B - A long GRB detected by INTEGRAL
  54. GRB 051105B (INTEGRAL 2701): Optical observation
  55. GRB 051105: Swift-BAT refined analysis
  56. GRB 051105: Optical limit
  57. GRB 051105: Swift detection of a short burst
  58. IBAS Alert 2700: Not a GRB
  59. GRB 051016B host spectroscopy and redshift
  60. GRB051016B: optical observation
  61. Recent GRB UBVRcIc field photometry
  62. Konus-Wind observation of GRB 051028
  63. GRB051028:MASTER correction and final results
  64. GRB 051022: RTT150 optical observations
  65. GRB 051021A: RTT150 optical observations
  66. GRB051028 SARA Observation
  67. GRB051028: optical observations
  68. GRB051028: Swift/UVOT upper limits
  69. GRB051028: confirmation of the afterglow
  70. GRB051028: WHT optical candidate
  71. GRB051028: Swift XRT Position
  72. GRB051028:MASTER observations
  73. GRB 051028 (=H3951): A GRB localized by HETE
  74. GRB051028:MASTER optical observations
  75. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  76. GRB051022: Swift XRT measurement of jet break
  77. GRB051021B: Swift/UVOT Upper limits
  78. GRB 051021, Optical Observations
  79. GRB 051022: XRT Refined Spectral and Temporal Analysis
  80. GRB 051022, refined optical astrometry
  81. Chandra Observations of GRB 051022
  82. GRB 051022 Chandra Observations scheduled
  83. GRB051021a: optical observations
  84. GRB 051022: WSRT Radio Detection
  85. GRB 051022, mm counterpart
  86. GRB051022: host galaxy redshift
  87. GRB 051022: Swift/UVOT Upper Limits
  88. GRB051022: Radio Counterpart
  89. GRB 051022: SOAR JKs Observations
  90. Konus-Wind observation of GRB 051022
  91. GRB051022: Optical Observations
  92. GRB 051022: Magellan NIR imaging
  93. GRB 051021: PROMPT RcIc Observations
  94. GRB051021b: Magellan IR Imaging
  95. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  96. GRB 051021: Correction
  97. GRB 051022, J & K-band observation
  98. GRB 051021, SMARTS optical/IR observations
  99. GRB 051021: P200 Ks Observations
  100. IPN triangulation of GRB051022 (=H3950)

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