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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"

32711 results found.

  1. GRB050525A,optical observation
  2. GRB 050525 : Lulin optical afterglow observations
  3. GRB050525: Super-LOTIS observations
  4. GRB 050525, spectral lag pseudo-redshift
  5. GRB 050525a: Gemini/GMOS Spectra
  6. GRB050306: optical afterglow not confirmed
  7. GRB 050525: BART optical observation
  8. GRB 050525A: BOOTES simultaneous optical observations
  9. GRB 050525A: Swift-BAT refined analysis
  10. GRB050525: Optical observations
  11. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  12. Swift/UVOT UV and optical detections of GRB 050525
  13. Konus-Wind observation of GRB 050525
  14. GRB 050525: TAROT observations of the early afterglow
  15. INTEGRAL detection of GRB 050525
  16. GRB 050525, infrared observations
  17. GRB 050525: Optical observation
  18. GRB 050525: observatons of the optical afterglow
  19. GRB050525: ROTSE-III Refined Analysis
  20. GRB 050525 - Very Bright, Not Short
  21. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  22. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  23. XRF050522: NIR observations of XRT candidate
  24. XRF 050522: Swift XRT refined analysis
  25. XRF050522: Radio Observations
  26. Swift/UVOT observation of XRF 050522
  27. GRB 050509A: Further I-band imaging
  28. XRF 050522: Continued NIR P200 Monitoring
  29. RBO Observations of GRB050522
  30. GRB050520: Radio Observations
  31. XRF 050522: Swift XRT observation
  32. XRF050522, BVRcIc field photometry
  33. XRF 050522 : Lulin observations
  34. XRF050522: Optical Observations
  35. XRF050522: Near-infrared Observations
  36. XRF 050522: KAIT observations
  37. GRB 050520: VLT/ULTRACAM observations
  38. Swift UVOT Observations of GRB 050520
  39. GRB 050520: Swift XRT refined analysis
  40. XRF050509C: Chandra Afterglow Detection
  41. XRF 050509c: Swift XRT Upper Limit
  42. XRF050509c: Radio Observations
  43. RBO Observations of GRB050520
  44. GRB 050520: P200 Observations
  45. GRB050520: Liverpool Telescope follow-up
  46. GRB 050520: TAROT optical limit
  47. GRB 050520: Swift XRT position
  48. GRB 050520: VLT/ULTRACAM observations
  49. GRB 050520: OSN optical observations
  50. No Swift-BAT Lightcurves in real-time for next 3 weeks
  51. Swift-BAT trigger 122203 is not a real GRB
  52. XRF 050509C: REM NIR and Optical refined analysis
  53. GRB 050504: Swift XRT afterglow candidate has faded
  54. XRF 050509c optical afterglow
  55. GRB 050509B and short GRB-SN association? (corrected)
  56. GRB 050509B and short GRB-SN association?
  57. GRB 050509B: Subaru Optical Observations
  58. GRB050502b: Early Observation
  59. GRB050509b, Bok telescope B-band imaging
  60. Refined Chandra analysis of GRB 050509b
  61. GRB050509b, SDSS pre-burst observations
  62. GRB 050509b: Keck/Chandra Cross-Correlation
  63. Chandra observation of GRB 050509b
  64. GRB 050509b: RAPTOR deep, early limits.
  65. GRB050509B: Optical/Infared observations
  66. GRB 050509b: Swift/UVOT follow-up measurements
  67. GRB 050509b Milagro GeV/TeV Observations
  68. GRB050509B: Optical observations at the Very Large Telescope
  69. GRB 050509b: No Optical Variability in XRT Error Circle
  70. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  71. GRB 050509a: Swift-BAT refined analysis
  72. GRB 050509c: ROTSE-III Optical Limits
  73. GRB 050509B: WSRT Radio Observations
  74. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  75. GRB 050505, early TAROT observation
  76. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  77. GRB 050509b: Further Analysis of Keck LRIS Images
  78. GRB 050509b: Physical Properties of the Candidate Host galaxy
  79. GRB 050505: SARA Observations
  80. Swift UVOT Follow-up Observations of GRB 050509B
  81. GRB 050509B, Optical Observations
  82. GRB 050509B: Swift/XRT refined analysis
  83. GRB050509a: Swift UVOT observations
  84. GRB 050509b: Optical observations
  85. GRB 050509b: Precision Astrometry
  86. GRB 050509b: Possible Optical Counterpart
  87. GRB 050509A: Optical observations
  88. GRB 050509b: Optical Counterpart Candidate
  89. GRB050509b: Radio Observations
  90. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  91. GRB 050509b: optical observations
  92. GRB 050509b: Swift XRT Position
  93. GRB 050509B: ROTSE-III Optical Limits
  94. GRB 050509a: Swift XRT Position
  95. GRB 050505: Keck I-band Magnitude
  96. GRB 050505: early time observations
  97. GRB 050502a: Swift XRT Upper Limit
  98. GRB 050505, simultaneous optical observation
  99. GRB050505: Infrared observations
  100. GRB 050505: Further Swift UVOT observations.

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