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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"

21904 results found.

  1. GRB050805a: MASTER optical candidat
  2. GRB 050824: ROTSE-III Optical Limits
  3. GRB050820a: PROMPT RcIc Observations
  4. XRF050509c: Radio upper limits from GMRT
  5. GRB050822: Swift/UVOT upper limits
  6. GRB 050820A BAT observations of second, larger episode of emission
  7. GRB050813: Maidanak I-band observations
  8. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  9. GRB050820B at FRAM
  10. Swift/UVOT UV Photometry of GRB 050820B
  11. GRB 050822: ROTSE-III Prompt Optical Limits
  12. GRB 050822: Swift detection of a long burst
  13. GRB050820a BVRcIc field photometry
  14. GRB050820B XMM-Newton observation
  15. GRB 050820B: Swift XRT position
  16. Swift/UVOT photometry of GRB050820
  17. GRB050820: refined XRT analysis
  18. GRB050819: refined XRT analysis
  19. GRB 050820: Swift detection of a GRB
  20. GRB050819: Swift-BAT detection of a weak burst
  21. GRB 050817: Optical observations
  22. GRB050817: Negative Optical Observations
  23. GRB 050814: continued fading
  24. GRB 050815: ROTSE-III Optical Limits
  25. GRB050815: Swift-BAT detection of a burst
  26. GRB050814: Fading red source
  27. GRB050814: P60 Optical Afterglow Candidate
  28. GRB 050813: Non-fading of afterglow candidate
  29. GRB 050814: XRT refined analysis
  30. GRB050814: SWIFT/UVOT observation
  31. GRB050814: Refined analysis of the Swift-BAT burst
  32. GRB 050814: Swift XRT Afterglow Localization
  33. GRB 050814: Swift detection of a burst
  34. GRB 050813: Magellan detection of a high redshift galaxy cluster
  35. GRB050813, SDSS pre-burst observations
  36. GRB050813: SWIFT/UVOT observation
  37. GRB 050813: Swift XRT afterglow localization
  38. RBO GRB 050714A and GRB 050716 observations
  39. GRB 050813: Possible Short Swift-BAT GRB
  40. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  41. Detection of an intermediate burst from SGR 1806-20 on August 8
  42. GRB 050730: WSRT Radio Observations
  43. GRB 050807: ROTSE-III Optical Limits
  44. GRB050805b: CrAO optical limit
  45. GRB050803, optical observations
  46. Retraction of Swift Trigger 149131 (GRB 050805B)
  47. GRB 050805b: OHP optical limits
  48. GRB 050805b: TAROT optical limits
  49. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  50. GRB050802: TNG optical observations
  51. GRB050803: Radio Observation
  52. GRB 050803: RTT150 optical observations
  53. GRB050801: Radio Observation
  54. GRB050730: Radio Detection
  55. GRB 050803: Keck Observations
  56. GRB 050803: Swift-BAT refined analysis
  57. GRB 050802.422: Fading of the afterglow and detection of the host
  58. GRB 050803: TAROT optical limits
  59. GRB050802 radio non-detection
  60. GRB 050730: OHP optical observations
  61. GRB 050802: Swift-BAT refined analysis
  62. GRB050801: Optical photometry and decay index
  63. GRB 050802: Swift Gamma-ray Burst
  64. GCN 050801: early Swift XRT analysis results
  65. GRB 050730: early TAROT optical observations
  66. GRB 050726: PROMPT Rc Observations
  67. GRB 050730, spectra and optical photometry
  68. GRB 050730 XMM-Newton observation
  69. GRB050730: Swift-BAT detection of a weak burst
  70. GRB 050709: PROMPT Rc Observations
  71. GRB 050724: WHT optical observations
  72. GRB050713: analysis of the XMM-Newton observation
  73. GRB050709: Second Epoch Chandra Observation
  74. GRB 050724: Optical Variability in Nearby Galaxy
  75. GRB 050724: J-band observations
  76. GRB 050724: GMOS Imaging and Spectroscopy
  77. RXTE ASM Detection of GRB050724
  78. GRB050724: Radio Observation
  79. GRB 050724: Swift/UVOT Upper Limit
  80. GRB 050724: possible host galaxy in DSS
  81. GRB 050721A: Swift-BAT refined analysis
  82. Correction to GCN Circ 3474 on GRB050525A
  83. GRB050721A: optical decay
  84. GRB 050721: optical afterglow confirmed
  85. GRB050721A: Swift-BAT detection of a weak burst
  86. GRB 050717: PROMPT RcIc Observations
  87. GRB050714b: Radio Observation
  88. GRB050712: Radio Observations
  89. GRB050713a: Radio Observation
  90. GRB 050712, Tautenburg optical afterglow observations
  91. Swift-BAT detection of a possible GRB
  92. GRB 050714B: VLT R-band observations
  93. GRB 050717: Additional LCO observations
  94. GRB050717
  95. GRB 050716; J-band observations
  96. Konus-Wind observation of GRB 050717
  97. GRB 050717: LCO near-IR observations
  98. Swift/UVOT Observations of GRB 050717
  99. GRB 050717: Swift-BAT refined analysis
  100. GRB050717: Swift XRT position

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