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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"

32716 results found.

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

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