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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"

32701 results found.

  1. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  2. Swift/UVOT UV and optical detections of GRB 050525
  3. Konus-Wind observation of GRB 050525
  4. GRB 050525: TAROT observations of the early afterglow
  5. INTEGRAL detection of GRB 050525
  6. GRB 050525, infrared observations
  7. GRB 050525: Optical observation
  8. GRB 050525: observatons of the optical afterglow
  9. GRB050525: ROTSE-III Refined Analysis
  10. GRB 050525 - Very Bright, Not Short
  11. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  12. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  13. XRF050522: NIR observations of XRT candidate
  14. XRF 050522: Swift XRT refined analysis
  15. XRF050522: Radio Observations
  16. Swift/UVOT observation of XRF 050522
  17. GRB 050509A: Further I-band imaging
  18. XRF 050522: Continued NIR P200 Monitoring
  19. RBO Observations of GRB050522
  20. GRB050520: Radio Observations
  21. XRF 050522: Swift XRT observation
  22. XRF050522, BVRcIc field photometry
  23. XRF 050522 : Lulin observations
  24. XRF050522: Optical Observations
  25. XRF050522: Near-infrared Observations
  26. XRF 050522: KAIT observations
  27. GRB 050520: VLT/ULTRACAM observations
  28. Swift UVOT Observations of GRB 050520
  29. GRB 050520: Swift XRT refined analysis
  30. XRF050509C: Chandra Afterglow Detection
  31. XRF 050509c: Swift XRT Upper Limit
  32. XRF050509c: Radio Observations
  33. RBO Observations of GRB050520
  34. GRB 050520: P200 Observations
  35. GRB050520: Liverpool Telescope follow-up
  36. GRB 050520: TAROT optical limit
  37. GRB 050520: Swift XRT position
  38. GRB 050520: VLT/ULTRACAM observations
  39. GRB 050520: OSN optical observations
  40. No Swift-BAT Lightcurves in real-time for next 3 weeks
  41. Swift-BAT trigger 122203 is not a real GRB
  42. XRF 050509C: REM NIR and Optical refined analysis
  43. GRB 050504: Swift XRT afterglow candidate has faded
  44. XRF 050509c optical afterglow
  45. GRB 050509B and short GRB-SN association? (corrected)
  46. GRB 050509B and short GRB-SN association?
  47. GRB 050509B: Subaru Optical Observations
  48. GRB050502b: Early Observation
  49. GRB050509b, Bok telescope B-band imaging
  50. Refined Chandra analysis of GRB 050509b
  51. GRB050509b, SDSS pre-burst observations
  52. GRB 050509b: Keck/Chandra Cross-Correlation
  53. Chandra observation of GRB 050509b
  54. GRB 050509b: RAPTOR deep, early limits.
  55. GRB050509B: Optical/Infared observations
  56. GRB 050509b: Swift/UVOT follow-up measurements
  57. GRB 050509b Milagro GeV/TeV Observations
  58. GRB050509B: Optical observations at the Very Large Telescope
  59. GRB 050509b: No Optical Variability in XRT Error Circle
  60. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  61. GRB 050509a: Swift-BAT refined analysis
  62. GRB 050509c: ROTSE-III Optical Limits
  63. GRB 050509B: WSRT Radio Observations
  64. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  65. GRB 050505, early TAROT observation
  66. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  67. GRB 050509b: Further Analysis of Keck LRIS Images
  68. GRB 050509b: Physical Properties of the Candidate Host galaxy
  69. GRB 050505: SARA Observations
  70. Swift UVOT Follow-up Observations of GRB 050509B
  71. GRB 050509B, Optical Observations
  72. GRB 050509B: Swift/XRT refined analysis
  73. GRB050509a: Swift UVOT observations
  74. GRB 050509b: Optical observations
  75. GRB 050509b: Precision Astrometry
  76. GRB 050509b: Possible Optical Counterpart
  77. GRB 050509A: Optical observations
  78. GRB 050509b: Optical Counterpart Candidate
  79. GRB050509b: Radio Observations
  80. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  81. GRB 050509b: optical observations
  82. GRB 050509b: Swift XRT Position
  83. GRB 050509B: ROTSE-III Optical Limits
  84. GRB 050509a: Swift XRT Position
  85. GRB 050505: Keck I-band Magnitude
  86. GRB 050505: early time observations
  87. GRB 050502a: Swift XRT Upper Limit
  88. GRB 050505, simultaneous optical observation
  89. GRB050505: Infrared observations
  90. GRB 050505: Further Swift UVOT observations.
  91. GRB050505: AAVSO observations
  92. GRB050416A : 1 GHz limit from GMRT
  93. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  94. GRB 050505 UVOT
  95. GRB050505: Optical Afterglow Candidate
  96. GRB 050505: Swift XRT Position
  97. GRB050505 Swift-BAT refined analysis
  98. GRB 050502a: Optical Observations
  99. GRB 050416b:Swift XRT afterglow upper limits
  100. GRB 050416b:Swift XRT afterglow upper limits

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