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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"

32717 results found.

  1. GRB 050509b: refined XRT/Chandra afterglow position analysis
  2. GRB050525a: optical upper limits
  3. GRB 050525a: SARA Observations
  4. GRB 050525B: Swift-BAT observations
  5. GRB 050525: MITSuME Optical Observation in VRI
  6. GRB 050525a: MDM Observations
  7. GRB050525A,optical observation
  8. GRB 050525 : Lulin optical afterglow observations
  9. GRB050525: Super-LOTIS observations
  10. GRB 050525, spectral lag pseudo-redshift
  11. GRB 050525a: Gemini/GMOS Spectra
  12. GRB050306: optical afterglow not confirmed
  13. GRB 050525: BART optical observation
  14. GRB 050525A: BOOTES simultaneous optical observations
  15. GRB 050525A: Swift-BAT refined analysis
  16. GRB050525: Optical observations
  17. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  18. Swift/UVOT UV and optical detections of GRB 050525
  19. Konus-Wind observation of GRB 050525
  20. GRB 050525: TAROT observations of the early afterglow
  21. INTEGRAL detection of GRB 050525
  22. GRB 050525, infrared observations
  23. GRB 050525: Optical observation
  24. GRB 050525: observatons of the optical afterglow
  25. GRB050525: ROTSE-III Refined Analysis
  26. GRB 050525 - Very Bright, Not Short
  27. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  28. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  29. XRF050522: NIR observations of XRT candidate
  30. XRF 050522: Swift XRT refined analysis
  31. XRF050522: Radio Observations
  32. Swift/UVOT observation of XRF 050522
  33. GRB 050509A: Further I-band imaging
  34. XRF 050522: Continued NIR P200 Monitoring
  35. RBO Observations of GRB050522
  36. GRB050520: Radio Observations
  37. XRF 050522: Swift XRT observation
  38. XRF050522, BVRcIc field photometry
  39. XRF 050522 : Lulin observations
  40. XRF050522: Optical Observations
  41. XRF050522: Near-infrared Observations
  42. XRF 050522: KAIT observations
  43. GRB 050520: VLT/ULTRACAM observations
  44. Swift UVOT Observations of GRB 050520
  45. GRB 050520: Swift XRT refined analysis
  46. XRF050509C: Chandra Afterglow Detection
  47. XRF 050509c: Swift XRT Upper Limit
  48. XRF050509c: Radio Observations
  49. RBO Observations of GRB050520
  50. GRB 050520: P200 Observations
  51. GRB050520: Liverpool Telescope follow-up
  52. GRB 050520: TAROT optical limit
  53. GRB 050520: Swift XRT position
  54. GRB 050520: VLT/ULTRACAM observations
  55. GRB 050520: OSN optical observations
  56. No Swift-BAT Lightcurves in real-time for next 3 weeks
  57. Swift-BAT trigger 122203 is not a real GRB
  58. XRF 050509C: REM NIR and Optical refined analysis
  59. GRB 050504: Swift XRT afterglow candidate has faded
  60. XRF 050509c optical afterglow
  61. GRB 050509B and short GRB-SN association? (corrected)
  62. GRB 050509B and short GRB-SN association?
  63. GRB 050509B: Subaru Optical Observations
  64. GRB050502b: Early Observation
  65. GRB050509b, Bok telescope B-band imaging
  66. Refined Chandra analysis of GRB 050509b
  67. GRB050509b, SDSS pre-burst observations
  68. GRB 050509b: Keck/Chandra Cross-Correlation
  69. Chandra observation of GRB 050509b
  70. GRB 050509b: RAPTOR deep, early limits.
  71. GRB050509B: Optical/Infared observations
  72. GRB 050509b: Swift/UVOT follow-up measurements
  73. GRB 050509b Milagro GeV/TeV Observations
  74. GRB050509B: Optical observations at the Very Large Telescope
  75. GRB 050509b: No Optical Variability in XRT Error Circle
  76. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  77. GRB 050509a: Swift-BAT refined analysis
  78. GRB 050509c: ROTSE-III Optical Limits
  79. GRB 050509B: WSRT Radio Observations
  80. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  81. GRB 050505, early TAROT observation
  82. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  83. GRB 050509b: Further Analysis of Keck LRIS Images
  84. GRB 050509b: Physical Properties of the Candidate Host galaxy
  85. GRB 050505: SARA Observations
  86. Swift UVOT Follow-up Observations of GRB 050509B
  87. GRB 050509B, Optical Observations
  88. GRB 050509B: Swift/XRT refined analysis
  89. GRB050509a: Swift UVOT observations
  90. GRB 050509b: Optical observations
  91. GRB 050509b: Precision Astrometry
  92. GRB 050509b: Possible Optical Counterpart
  93. GRB 050509A: Optical observations
  94. GRB 050509b: Optical Counterpart Candidate
  95. GRB050509b: Radio Observations
  96. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  97. GRB 050509b: optical observations
  98. GRB 050509b: Swift XRT Position
  99. GRB 050509B: ROTSE-III Optical Limits
  100. GRB 050509a: Swift XRT Position

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