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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"

42968 results found.

  1. Faulkes Telescope R-band detection of GRB051111
  2. GRB 051103 Milagro GeV/TeV Observations
  3. GRB051111: Swift-BAT detection of a bright burst
  4. GRB 051008 Tautenburg Supernova Search
  5. GRB 051109B. Radio Observations
  6. GRB 051109A
  7. GRB 051105a: GETS optical limit
  8. GRB 051109b: GETS observation
  9. GRB 051109A: KAIT optical observations
  10. Early RAPTOR measurements of GRB 051109a - the movie.
  11. Konus-Wind observation of GRB 051109A
  12. GRB 051109B: ROTSE-III Optical Limits
  13. GRB 051109A: Swift-UVOT Observations
  14. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  15. GRB051109B: no UVOT source detected
  16. GRB051109B: XRT refined analysis
  17. GRB 051109B : Lulin Optical Observations
  18. GRB051109A: further steepening in the X-ray light curve
  19. GRB051109A: XRT refined analysis
  20. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  21. GRB051109B: XRT position
  22. GRB 051109B Kiso optical follow-up observation
  23. GRB051105B: REM Optical observation
  24. GRB 051109B: Swift detection of a burst
  25. GRB 051109: HET Optical Spectrum and Absorption Redshift
  26. GRB 051109: PROMPT Detections
  27. GRB 051109: Rc and Ic observations
  28. GRB051109: Early Super-LOTIS Detection
  29. GRB 051109a: IR Photometry and Astrometry
  30. GRB 051109a: MDM Observations
  31. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  32. GRB051109: Swift detection of a burst
  33. GRB 051109a: IR Detections
  34. GRB051105B: Swift/XRT upper limit
  35. GRB051103: optical observations
  36. GRB 051103, optical observations
  37. GRB051103: MASTER: OT limit and host galaxy candidates
  38. GRB051028: Swift-XRT refined analysis
  39. GRB 051105a, observation from Naini Tal and OSN
  40. GRB 051105A, 2nd epoch optical observations
  41. GRB 051105a: MDM Observations
  42. GRB 051105A: TNG optical observations
  43. GRB051105A: Swift/UVOT Observations
  44. GRB 051105A, radio observations
  45. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  46. GRB 051105A, optical observations
  47. XRT observations of GRB 051105A
  48. GRB 051105: Swift-BAT improved refined analysis
  49. GRB 051105b: ART optical limits
  50. GRB051105B - A long GRB detected by INTEGRAL
  51. GRB 051105B (INTEGRAL 2701): Optical observation
  52. GRB 051105: Swift-BAT refined analysis
  53. GRB 051105: Optical limit
  54. GRB 051105: Swift detection of a short burst
  55. IBAS Alert 2700: Not a GRB
  56. GRB 051016B host spectroscopy and redshift
  57. GRB051016B: optical observation
  58. Recent GRB UBVRcIc field photometry
  59. Konus-Wind observation of GRB 051028
  60. GRB051028:MASTER correction and final results
  61. GRB 051022: RTT150 optical observations
  62. GRB051028 SARA Observation
  63. GRB051028: optical observations
  64. GRB051028: Swift/UVOT upper limits
  65. GRB051028: confirmation of the afterglow
  66. GRB051028: WHT optical candidate
  67. GRB051028: Swift XRT Position
  68. GRB 051028 (=H3951): A GRB localized by HETE
  69. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  70. GRB051022: Swift XRT measurement of jet break
  71. SGR 1806-20: continued moderate activity seen with INTEGRAL
  72. GRB051021B: Swift/UVOT Upper limits
  73. GRB 051021, Optical Observations
  74. GRB 051022: XRT Refined Spectral and Temporal Analysis
  75. GRB 051022, refined optical astrometry
  76. Chandra Observations of GRB 051022
  77. GRB051012: Swift-XRT analysis
  78. GRB 051022 Chandra Observations scheduled
  79. GRB051021B: Swift XRT refined analysis
  80. GRB051021a: optical observations
  81. GRB 051022: WSRT Radio Detection
  82. GRB 051022, mm counterpart
  83. GRB051022: host galaxy redshift
  84. GRB051022: Radio Counterpart
  85. GRB 051022: SOAR JKs Observations
  86. GRB051021A: Swift XRT refined analysis
  87. Konus-Wind observation of GRB 051022
  88. GRB051022: Optical Observations
  89. GRB 051022: Magellan NIR imaging
  90. GRB 051021: PROMPT RcIc Observations
  91. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  92. GRB 051022, J & K-band observation
  93. GRB 051021, SMARTS optical/IR observations
  94. GRB 051021: P200 Ks Observations
  95. IPN triangulation of GRB051022 (=H3950)
  96. GRB 051021: MDM Upper Limit
  97. GRB 051022 (=H3950): SXC Flight Localization is Valid
  98. GRB 051022: SSO40 Optical Observations
  99. GRB 051022A: ROTSE-III Optical Limits
  100. GRB051022 (=H3590), A GRB Detected By HETE

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