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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"

36236 results found.

  1. Konus-Wind observation of GRB 051109A
  2. GRB 051109B: Swift-BAT refined analysis
  3. GRB 051109B: ROTSE-III Optical Limits
  4. GRB 051109A: Swift-UVOT Observations
  5. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  6. GRB 051109B : Lulin Optical Observations
  7. GRB 051109A : Lulin BVRI Optical afterglow observation
  8. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  9. GRB051109B: XRT position
  10. GRB 051109B: Super-LOTIS Observations
  11. GRB 051109B Kiso optical follow-up observation
  12. GRB 051109B: Swift detection of a burst
  13. GRB 051109: HET Optical Spectrum and Absorption Redshift
  14. GRB 051109: PROMPT Detections
  15. GRB 051109: Rc and Ic observations
  16. GRB 051109: Swift-BAT refined analysis
  17. GRB 051109a: IR Photometry and Astrometry
  18. GRB 051109a: MDM Observations
  19. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  20. GRB 051109a: IR Detections
  21. GRB 051109: ROTSE-III Detection of Possible Counterpart
  22. GRB051105B: Swift/XRT upper limit
  23. GRB051105B: Swift/UVOT upper limit
  24. GRB051103: optical observations
  25. GRB 051103, optical observations
  26. GRB051103: MASTER: OT limit and host galaxy candidates
  27. GRB 051105a, observation from Naini Tal and OSN
  28. GRB 051105A, 2nd epoch optical observations
  29. GRB 051105a: MDM Observations
  30. GRB 051105A: TNG optical observations
  31. GRB051105A: Swift/UVOT Observations
  32. GRB 051105A, radio observations
  33. GRB051103:_MASTER_optical_observations
  34. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  35. GRB 051105A, optical observations
  36. XRT observations of GRB 051105A
  37. GRB 051105: Swift-BAT improved refined analysis
  38. GRB 051105b: ART optical limits
  39. GRB051105B - A long GRB detected by INTEGRAL
  40. GRB 051105B (INTEGRAL 2701): Optical observation
  41. GRB 051105: Swift-BAT refined analysis
  42. GRB 051105: Optical limit
  43. GRB 051105: Swift detection of a short burst
  44. IBAS Alert 2700: Not a GRB
  45. GRB 051016B host spectroscopy and redshift
  46. GRB051016B: optical observation
  47. Recent GRB UBVRcIc field photometry
  48. Konus-Wind observation of GRB 051028
  49. GRB051028:MASTER correction and final results
  50. GRB 051022: RTT150 optical observations
  51. GRB 051021A: RTT150 optical observations
  52. GRB051028 SARA Observation
  53. GRB051028: optical observations
  54. GRB051028: Swift/UVOT upper limits
  55. GRB051028: confirmation of the afterglow
  56. GRB051028: WHT optical candidate
  57. GRB051028: Swift XRT Position
  58. GRB051028:MASTER observations
  59. GRB 051028 (=H3951): A GRB localized by HETE
  60. GRB051028:MASTER optical observations
  61. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  62. GRB051022: Swift XRT measurement of jet break
  63. GRB051021B: Swift/UVOT Upper limits
  64. GRB 051021, Optical Observations
  65. GRB 051022: XRT Refined Spectral and Temporal Analysis
  66. GRB 051022, refined optical astrometry
  67. Chandra Observations of GRB 051022
  68. GRB 051022 Chandra Observations scheduled
  69. GRB051021a: optical observations
  70. GRB 051022: WSRT Radio Detection
  71. GRB 051022, mm counterpart
  72. GRB051022: host galaxy redshift
  73. GRB 051022: Swift/UVOT Upper Limits
  74. GRB051022: Radio Counterpart
  75. GRB 051022: SOAR JKs Observations
  76. Konus-Wind observation of GRB 051022
  77. GRB051022: Optical Observations
  78. GRB 051022: Magellan NIR imaging
  79. GRB 051021: PROMPT RcIc Observations
  80. GRB051021b: Magellan IR Imaging
  81. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  82. GRB 051021: Correction
  83. GRB 051022, J & K-band observation
  84. GRB 051021, SMARTS optical/IR observations
  85. GRB 051021: P200 Ks Observations
  86. IPN triangulation of GRB051022 (=H3950)
  87. GRB 051021: MDM Upper Limit
  88. GRB 051022 (=H3950): SXC Flight Localization is Valid
  89. GRB051021: Swift/UVOT Upper Limits
  90. GRB 051021B: Refined analysis of the Swift-BAT burst
  91. GRB 051022: SSO40 Optical Observations
  92. GRB 051022A: ROTSE-III Optical Limits
  93. GRB051022 (=H3590), A GRB Detected By HETE
  94. GRB 051022: Optical observations
  95. GRB 051021,optical observation
  96. GRB051021B: Swift XRT Position
  97. GRB 051021: SOAR NIR Observations
  98. GRB 051021B: Swift detection of a burst
  99. GRB051021 (=H3947): Refined Analysis
  100. GRB 051021 : optical afterglow observation at Lulin

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