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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"

45766 results found.

  1. GRB 051109A : Lulin BVRI Optical afterglow observation
  2. GRB051109A: further steepening in the X-ray light curve
  3. GRB051109A: XRT refined analysis
  4. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  5. GRB051109B: XRT position
  6. GRB 051109B: Super-LOTIS Observations
  7. GRB 051109B Kiso optical follow-up observation
  8. GRB051105B: REM Optical observation
  9. GRB 051109B: Swift detection of a burst
  10. GRB 051109: HET Optical Spectrum and Absorption Redshift
  11. GRB 051109: PROMPT Detections
  12. GRB 051109: Rc and Ic observations
  13. GRB051109: Early Super-LOTIS Detection
  14. GRB 051109: Swift-BAT refined analysis
  15. GRB 051109a: IR Photometry and Astrometry
  16. GRB 051109a: MDM Observations
  17. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  18. GRB051109: Swift detection of a burst
  19. GRB 051109a: IR Detections
  20. GRB 051109: ROTSE-III Detection of Possible Counterpart
  21. GRB051105B: Swift/XRT upper limit
  22. GRB051105B: Swift/UVOT upper limit
  23. GRB051103: optical observations
  24. GRB 051103, optical observations
  25. GRB051103: MASTER: OT limit and host galaxy candidates
  26. GRB051028: Swift-XRT refined analysis
  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. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  34. GRB 051105A, optical observations
  35. XRT observations of GRB 051105A
  36. GRB 051105: Swift-BAT improved refined analysis
  37. GRB 051105b: ART optical limits
  38. GRB051105B - A long GRB detected by INTEGRAL
  39. GRB 051105B (INTEGRAL 2701): Optical observation
  40. GRB 051105: Swift-BAT refined analysis
  41. GRB 051105: Optical limit
  42. GRB 051105: Swift detection of a short burst
  43. IBAS Alert 2700: Not a GRB
  44. GRB 051016B host spectroscopy and redshift
  45. GRB051016B: optical observation
  46. Recent GRB UBVRcIc field photometry
  47. Konus-Wind observation of GRB 051028
  48. GRB 051022: RTT150 optical observations
  49. GRB051028 SARA Observation
  50. GRB051028: optical observations
  51. GRB051028: Swift/UVOT upper limits
  52. GRB051028: confirmation of the afterglow
  53. GRB051028: WHT optical candidate
  54. GRB051028: Swift XRT Position
  55. GRB051028:MASTER observations
  56. GRB 051028 (=H3951): A GRB localized by HETE
  57. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  58. GRB051022: Swift XRT measurement of jet break
  59. SGR 1806-20: continued moderate activity seen with INTEGRAL
  60. GRB051021B: Swift/UVOT Upper limits
  61. GRB 051021, Optical Observations
  62. GRB 051022: XRT Refined Spectral and Temporal Analysis
  63. GRB 051022, refined optical astrometry
  64. Chandra Observations of GRB 051022
  65. GRB051012: Swift-XRT analysis
  66. GRB 051022 Chandra Observations scheduled
  67. GRB051021B: Swift XRT refined analysis
  68. GRB051021a: optical observations
  69. GRB 051022: WSRT Radio Detection
  70. GRB 051022, mm counterpart
  71. GRB051022: host galaxy redshift
  72. GRB 051022: Swift/UVOT Upper Limits
  73. GRB051022: Radio Counterpart
  74. GRB051022: IR observations
  75. GRB 051022: SOAR JKs Observations
  76. GRB051021A: Swift XRT refined analysis
  77. Konus-Wind observation of GRB 051022
  78. GRB051022: Optical Observations
  79. GRB 051022: Magellan NIR imaging
  80. GRB 051021: PROMPT RcIc Observations
  81. GRB051021b: Magellan IR Imaging
  82. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  83. GRB 051021: Correction
  84. GRB 051021, SMARTS optical/IR observations
  85. GRB051022: Swift XRT Position
  86. GRB 051021: P200 Ks Observations
  87. IPN triangulation of GRB051022 (=H3950)
  88. GRB 051021: MDM Upper Limit
  89. GRB 051022 (=H3950): SXC Flight Localization is Valid
  90. GRB051021: Swift/UVOT Upper Limits
  91. GRB 051021B: Refined analysis of the Swift-BAT burst
  92. GRB 051022: SSO40 Optical Observations
  93. GRB051022,optical observation
  94. GRB 051022A: ROTSE-III Optical Limits
  95. GRB051022 (=H3590), A GRB Detected By HETE
  96. GRB 051022: Optical observations
  97. GRB 051021,optical observation
  98. GRB051021B: Swift XRT Position
  99. GRB 051021: SOAR NIR Observations
  100. GRB 051021B: Swift detection of a burst

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