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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"

36308 results found.

  1. GRB 050525B: Swift-BAT observations
  2. GRB 050525: MITSuME Optical Observation in VRI
  3. GRB 050525a: MDM Observations
  4. GRB050525A,optical observation
  5. GRB 050525 : Lulin optical afterglow observations
  6. GRB050525: Super-LOTIS observations
  7. GRB 050525, spectral lag pseudo-redshift
  8. GRB 050525a: Gemini/GMOS Spectra
  9. GRB050306: optical afterglow not confirmed
  10. GRB 050525: BART optical observation
  11. GRB 050525A: BOOTES simultaneous optical observations
  12. GRB 050525A: Swift-BAT refined analysis
  13. GRB050525: Optical observations
  14. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  15. GRB 050525: pseudo-redshift
  16. Swift/UVOT UV and optical detections of GRB 050525
  17. Konus-Wind observation of GRB 050525
  18. GRB 050525: TAROT observations of the early afterglow
  19. INTEGRAL detection of GRB 050525
  20. GRB 050525, infrared observations
  21. GRB 050525: Optical observation
  22. GRB 050525: observatons of the optical afterglow
  23. GRB050525: ROTSE-III Refined Analysis
  24. GRB 050525 - Very Bright, Not Short
  25. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  26. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  27. XRF050522: NIR observations of XRT candidate
  28. XRF050522: Radio Observations
  29. GRB 050509A: Further I-band imaging
  30. GRB050522,optical observation
  31. GRB050520,optical observation
  32. XRF 050522: Continued NIR P200 Monitoring
  33. RBO Observations of GRB050522
  34. GRB050509b: optical observations
  35. Recent GRB BVRcIc field photometry
  36. GRB050520: Radio Observations
  37. XRF050522, BVRcIc field photometry
  38. XRF050522: Optical Observations
  39. XRF 050522: KAIT observations
  40. XRF 050522 detected with INTEGRAL
  41. GRB 050520: VLT/ULTRACAM observations
  42. Swift UVOT Observations of GRB 050520
  43. GRB 050520: Swift XRT refined analysis
  44. RBO Observations of GRB050520
  45. GRB 050520: P200 Observations
  46. GRB050520: Liverpool Telescope follow-up
  47. GRB 050520: TAROT optical limit
  48. GRB 050520: Swift XRT position
  49. GRB 050520: VLT/ULTRACAM observations
  50. GRB 050520: OSN optical observations
  51. GRB 050520: BART optical limit
  52. GRB 050520 - A long GRB detected with INTEGRAL
  53. Swift-BAT trigger 122203 is not a real GRB
  54. GRB 050504: Swift XRT afterglow candidate has faded
  55. XRF 050509c optical afterglow
  56. GRB 050509B and short GRB-SN association? (corrected)
  57. GRB 050509B and short GRB-SN association?
  58. GRB 050509B: Subaru Optical Observations
  59. GRB050502b: Early Observation
  60. GRB050509b, Bok telescope B-band imaging
  61. Refined Chandra analysis of GRB 050509b
  62. GRB050509b, SDSS pre-burst observations
  63. GRB 050509b: Keck/Chandra Cross-Correlation
  64. GRB 050509b: Keck/Chandra Cross-Correlation
  65. Chandra observation of GRB 050509b
  66. GRB 050509b: RAPTOR deep, early limits.
  67. GRB050509B: Optical/Infared observations
  68. GRB 050509b: Swift/UVOT follow-up measurements
  69. GRB 050509b Milagro GeV/TeV Observations
  70. GRB050509B: Optical observations at the Very Large Telescope
  71. GRB 050509b: No Optical Variability in XRT Error Circle
  72. GRB 050509a: Swift-BAT refined analysis
  73. GRB 050509c: ROTSE-III Optical Limits
  74. GRB 050509B: WSRT Radio Observations
  75. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  76. GRB 050505, early TAROT observation
  77. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  78. GRB 050509b: Further Analysis of Keck LRIS Images
  79. GRB050509c: REM NIR and Optical observations
  80. GRB 050509b: Physical Properties of the Candidate Host galaxy
  81. GRB 050505: SARA Observations
  82. Swift UVOT Follow-up Observations of GRB 050509B
  83. GRB 050509B, Optical Observations
  84. GRB 050509B: Swift/XRT refined analysis
  85. GRB 050509b: Optical observations
  86. GRB 050509b: Precision Astrometry
  87. GRB 050509b: Possible Optical Counterpart
  88. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  89. GRB 050509A: Optical observations
  90. GRB 050509b: Optical Counterpart Candidate
  91. GRB 050509b: PAIRITEL and WIYN Observations
  92. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  93. GRB 050509b: optical observations
  94. GRB 050509b: Swift XRT Position
  95. GRB 050509B: ROTSE-III Optical Limits
  96. GRB 050509a: Swift XRT Position
  97. Swift-BAT detection of GRB 050507
  98. GRB 050505: Keck I-band Magnitude
  99. GRB 050505: early time observations
  100. GRB 050505 - Faulkes Telescope North observations

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