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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"

45719 results found.

  1. GRB 050525, infrared observations
  2. GRB 050525: Optical observation
  3. GRB 050525: observatons of the optical afterglow
  4. GRB050525: ROTSE-III Refined Analysis
  5. GRB 050525 - Very Bright, Not Short
  6. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  7. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  8. XRF050522: NIR observations of XRT candidate
  9. XRF 050522: Swift XRT refined analysis
  10. XRF050522: Radio Observations
  11. Swift/UVOT observation of XRF 050522
  12. GRB 050509A: Further I-band imaging
  13. GRB050522,optical observation
  14. GRB050520,optical observation
  15. XRF 050522: Continued NIR P200 Monitoring
  16. RBO Observations of GRB050522
  17. GRB050509b: optical observations
  18. Recent GRB BVRcIc field photometry
  19. GRB050520: Radio Observations
  20. XRF 050522: Swift XRT observation
  21. XRF050522, BVRcIc field photometry
  22. XRF 050522 : Lulin observations
  23. XRF050522: Optical Observations
  24. XRF050522: Near-infrared Observations
  25. XRF 050522: KAIT observations
  26. XRF 050522 detected with INTEGRAL
  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. RBO Observations of GRB050520
  37. GRB 050520: TAROT optical limit
  38. GRB 050520: Swift XRT position
  39. GRB 050520: VLT/ULTRACAM observations
  40. GRB 050520: OSN optical observations
  41. GRB 050520: BART optical limit
  42. GRB 050520 - A long GRB detected with INTEGRAL
  43. No Swift-BAT Lightcurves in real-time for next 3 weeks
  44. Swift-BAT trigger 122203 is not a real GRB
  45. XRF 050509C: REM NIR and Optical refined analysis
  46. GRB 050504: Swift XRT afterglow candidate has faded
  47. XRF 050509c optical afterglow
  48. GRB 050509B and short GRB-SN association? (corrected)
  49. GRB 050509B and short GRB-SN association?
  50. GRB 050509B: Subaru Optical Observations
  51. GRB050502b: Early Observation
  52. GRB050509b, Bok telescope B-band imaging
  53. Refined Chandra analysis of GRB 050509b
  54. GRB050509b, SDSS pre-burst observations
  55. GRB 050509b: Keck/Chandra Cross-Correlation
  56. GRB 050509b: Keck/Chandra Cross-Correlation
  57. Chandra observation of GRB 050509b
  58. GRB 050509b: RAPTOR deep, early limits.
  59. GRB050509B: Optical/Infared observations
  60. GRB 050509b: Swift/UVOT follow-up measurements
  61. GRB 050509b Milagro GeV/TeV Observations
  62. GRB050509B: Optical observations at the Very Large Telescope
  63. GRB 050509b: No Optical Variability in XRT Error Circle
  64. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  65. GRB 050509a: Swift-BAT refined analysis
  66. GRB 050509c: ROTSE-III Optical Limits
  67. GRB 050509B: WSRT Radio Observations
  68. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  69. GRB 050505, early TAROT observation
  70. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  71. GRB 050509b: Further Analysis of Keck LRIS Images
  72. GRB050509c: REM NIR and Optical observations
  73. GRB 050509b: Physical Properties of the Candidate Host galaxy
  74. GRB 050505: SARA Observations
  75. Swift UVOT Follow-up Observations of GRB 050509B
  76. GRB 050509B, Optical Observations
  77. GRB 050509B: Swift/XRT refined analysis
  78. GRB050509a: Swift UVOT observations
  79. GRB 050509b: Optical observations
  80. GRB 050509b: Precision Astrometry
  81. GRB 050509b: Possible Optical Counterpart
  82. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  83. GRB 050509A: Optical observations
  84. GRB 050509b: Optical Counterpart Candidate
  85. GRB050509b: Radio Observations
  86. GRB 050509b: PAIRITEL and WIYN Observations
  87. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  88. GRB 050509b: optical observations
  89. GRB 050509b: Swift XRT Position
  90. GRB 050509B: ROTSE-III Optical Limits
  91. Swift Detection of GRB050509b: A short duration burst
  92. GRB 050509a: Swift XRT Position
  93. Swift Detection of the Burst GRB050509
  94. Swift-BAT detection of GRB 050507
  95. GRB 050505: Keck I-band Magnitude
  96. GRB 050505: early time observations
  97. GRB 050505 - Faulkes Telescope North observations
  98. GRB 050502a: Swift XRT Upper Limit
  99. GRB 050505, simultaneous optical observation
  100. GRB050505: Infrared observations

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