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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11841 results found.

  1. GRB050803, optical observations
  2. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  3. GRB 050803: RTT150 optical observations
  4. GRB050803: CrAO optical observations, possible OT candidate
  5. GRB 050803: Swift-BAT refined analysis
  6. GRB050803: MASTER further analys
  7. GRB 050803: early Swift XRT analysis results
  8. GCN GRB observation 050713A
  9. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  10. GRB050802: CrAO optical observations
  11. GRB 050802: Swift Gamma-ray Burst
  12. GRB 050801: Swift-BAT refined analysis
  13. GRB 050730, corrected photometry and break?
  14. GRB050730: Refined BAT analysis of the Swift-BAT burst
  15. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  16. GRB050730: Liverpool Telescope optical observations
  17. GRB 050730, optical candidate
  18. GRB050730: Swift-BAT detection of a weak burst
  19. GRB050713b: Maidanak optical observations
  20. GRB 050724: Chandra Observations of the X-ray Afterglow
  21. GRB 050724, SMARTS optical/IR afterglow observations
  22. GRB 050726, SMARTS optical/IR observations
  23. GRB 050724: J-band observations
  24. GRB 050724: SWIFT XRT refined position
  25. GRB050721A: Swift-BAT detection of a weak burst
  26. GRB 050712, Tautenburg optical afterglow observations
  27. Konus-Wind observation of GRB 050717
  28. Swift detection of GRB 050717
  29. Konus-Wind observation of GRB 050713A
  30. GRB 050714, R-band candidate
  31. GRB 050714A: ROTSE-III Optical Limits
  32. GRB 050714 - A long GRB detected with INTEGRAL
  33. GRB 050712, optical observations
  34. GRB050709: Candidate X-ray Afterglow from Chandra
  35. GRB 050713: Swift detection of Bright Burst
  36. GRB 050713A: ROTSE-III Optical Limits
  37. GRB050709: Radio Observations
  38. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  39. GRB 050626 optical observations
  40. GRB 050626: Swift XRT observations
  41. GRB 050408: ARC 3.5-meter NIR Observations
  42. GRB050701: Swift-BAT Refined analysis
  43. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  44. GRB 050626 - a long GRB detected with INTEGRAL
  45. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  46. Konus-Wind observation of an intermediate burst from SGR 1806-20
  47. GRB 050607: Optical decay and spectral slope
  48. Optical Afterglow of GRB 050607
  49. Konus-Wind observation of GRB 050603
  50. GRB050528: updated Liverpool Telescope limits
  51. GRB 050525: RTT150, Optical observations
  52. GRB 050525: MITSuME Optical Observation in VRI
  53. GRB050525: Super-LOTIS observations
  54. GRB 050525A: Swift-BAT refined analysis
  55. GRB050525: Optical observations
  56. Konus-Wind observation of GRB 050525
  57. INTEGRAL detection of GRB 050525
  58. GRB 050525, infrared observations
  59. GRB 050525: Optical observation
  60. GRB050525: ROTSE-III Refined Analysis
  61. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  62. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  63. XRF050522: NIR observations of XRT candidate
  64. XRF 050522: Swift XRT refined analysis
  65. GRB 050509A: Further I-band imaging
  66. GRB050522,optical observation
  67. GRB050520,optical observation
  68. GRB050509b: optical observations
  69. XRF 050522: Swift XRT observation
  70. XRF050522: Optical Observations
  71. XRF 050522 detected with INTEGRAL
  72. GRB 050520: Swift XRT refined analysis
  73. XRF050509C: Chandra Afterglow Detection
  74. XRF 050509c: Swift XRT Upper Limit
  75. GRB050520: Liverpool Telescope follow-up
  76. GRB 050520 - A long GRB detected with INTEGRAL
  77. Swift-BAT trigger 122203 is not a real GRB
  78. GRB 050509B and short GRB-SN association? (corrected)
  79. GRB 050509B and short GRB-SN association?
  80. GRB050509b, Bok telescope B-band imaging
  81. Chandra observation of GRB 050509b
  82. GRB 050509b: RAPTOR deep, early limits.
  83. GRB 050509a: Swift-BAT refined analysis
  84. GRB 050509c: ROTSE-III Optical Limits
  85. GRB 050509A: Optical observations
  86. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  87. GRB 050509B: ROTSE-III Optical Limits
  88. GRB 050509a: Swift XRT Position
  89. Swift-BAT detection of GRB 050507
  90. GRB 050502a: Swift XRT Upper Limit
  91. GRB050416A : 1 GHz limit from GMRT
  92. GRB050505 Swift-BAT refined analysis
  93. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  94. GRB050502b: Afterglow Confirmation
  95. GRB 050504, R band Observations
  96. GRB 050504: A long GRB detected with INTEGRAL
  97. Renewal of SGR 1806-20 activity
  98. GRB050502A: Optical Observations
  99. GRB 050502: INTEGRAL results
  100. GRB 050502 - A long GRB detected with INTEGRAL

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