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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"

45718 results found.

  1. GRB 050525: Optical observation
  2. GRB 050525: observatons of the optical afterglow
  3. GRB050525: ROTSE-III Refined Analysis
  4. GRB 050525 - Very Bright, Not Short
  5. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  6. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  7. XRF050522: NIR observations of XRT candidate
  8. XRF 050522: Swift XRT refined analysis
  9. XRF050522: Radio Observations
  10. Swift/UVOT observation of XRF 050522
  11. GRB 050509A: Further I-band imaging
  12. GRB050522,optical observation
  13. GRB050520,optical observation
  14. XRF 050522: Continued NIR P200 Monitoring
  15. RBO Observations of GRB050522
  16. GRB050509b: optical observations
  17. Recent GRB BVRcIc field photometry
  18. GRB050520: Radio Observations
  19. XRF 050522: Swift XRT observation
  20. XRF050522, BVRcIc field photometry
  21. XRF 050522 : Lulin observations
  22. XRF050522: Optical Observations
  23. XRF050522: Near-infrared Observations
  24. XRF 050522: KAIT observations
  25. XRF 050522 detected with INTEGRAL
  26. GRB 050520: VLT/ULTRACAM observations
  27. Swift UVOT Observations of GRB 050520
  28. GRB 050520: Swift XRT refined analysis
  29. XRF050509C: Chandra Afterglow Detection
  30. XRF 050509c: Swift XRT Upper Limit
  31. XRF050509c: Radio Observations
  32. RBO Observations of GRB050520
  33. GRB 050520: P200 Observations
  34. GRB050520: Liverpool Telescope follow-up
  35. RBO Observations of GRB050520
  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. GRB 050520: BART optical limit
  41. GRB 050520 - A long GRB detected with INTEGRAL
  42. No Swift-BAT Lightcurves in real-time for next 3 weeks
  43. Swift-BAT trigger 122203 is not a real GRB
  44. XRF 050509C: REM NIR and Optical refined analysis
  45. GRB 050504: Swift XRT afterglow candidate has faded
  46. XRF 050509c optical afterglow
  47. GRB 050509B and short GRB-SN association? (corrected)
  48. GRB 050509B and short GRB-SN association?
  49. GRB 050509B: Subaru Optical Observations
  50. GRB050502b: Early Observation
  51. GRB050509b, Bok telescope B-band imaging
  52. Refined Chandra analysis of GRB 050509b
  53. GRB050509b, SDSS pre-burst observations
  54. GRB 050509b: Keck/Chandra Cross-Correlation
  55. GRB 050509b: Keck/Chandra Cross-Correlation
  56. Chandra observation of GRB 050509b
  57. GRB 050509b: RAPTOR deep, early limits.
  58. GRB050509B: Optical/Infared observations
  59. GRB 050509b: Swift/UVOT follow-up measurements
  60. GRB 050509b Milagro GeV/TeV Observations
  61. GRB050509B: Optical observations at the Very Large Telescope
  62. GRB 050509b: No Optical Variability in XRT Error Circle
  63. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  64. GRB 050509a: Swift-BAT refined analysis
  65. GRB 050509c: ROTSE-III Optical Limits
  66. GRB 050509B: WSRT Radio Observations
  67. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  68. GRB 050505, early TAROT observation
  69. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  70. GRB 050509b: Further Analysis of Keck LRIS Images
  71. GRB050509c: REM NIR and Optical observations
  72. GRB 050509b: Physical Properties of the Candidate Host galaxy
  73. GRB 050505: SARA Observations
  74. Swift UVOT Follow-up Observations of GRB 050509B
  75. GRB 050509B, Optical Observations
  76. GRB 050509B: Swift/XRT refined analysis
  77. GRB050509a: Swift UVOT observations
  78. GRB 050509b: Optical observations
  79. GRB 050509b: Precision Astrometry
  80. GRB 050509b: Possible Optical Counterpart
  81. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  82. GRB 050509A: Optical observations
  83. GRB 050509b: Optical Counterpart Candidate
  84. GRB050509b: Radio Observations
  85. GRB 050509b: PAIRITEL and WIYN Observations
  86. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  87. GRB 050509b: optical observations
  88. GRB 050509b: Swift XRT Position
  89. GRB 050509B: ROTSE-III Optical Limits
  90. Swift Detection of GRB050509b: A short duration burst
  91. GRB 050509a: Swift XRT Position
  92. Swift Detection of the Burst GRB050509
  93. Swift-BAT detection of GRB 050507
  94. GRB 050505: Keck I-band Magnitude
  95. GRB 050505: early time observations
  96. GRB 050505 - Faulkes Telescope North 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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