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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"

37704 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. GRB 050525: pseudo-redshift
  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. XRF050522: Radio Observations
  31. GRB 050509A: Further I-band imaging
  32. GRB050522,optical observation
  33. GRB050520,optical observation
  34. XRF 050522: Continued NIR P200 Monitoring
  35. RBO Observations of GRB050522
  36. GRB050509b: optical observations
  37. Recent GRB BVRcIc field photometry
  38. GRB050520: Radio Observations
  39. XRF050522, BVRcIc field photometry
  40. XRF050522: Optical Observations
  41. XRF 050522: KAIT observations
  42. XRF 050522 detected with INTEGRAL
  43. GRB 050520: VLT/ULTRACAM observations
  44. Swift UVOT Observations of GRB 050520
  45. GRB 050520: Swift XRT refined analysis
  46. RBO Observations of GRB050520
  47. GRB 050520: P200 Observations
  48. GRB050520: Liverpool Telescope follow-up
  49. GRB 050520: TAROT optical limit
  50. GRB 050520: Swift XRT position
  51. GRB 050520: VLT/ULTRACAM observations
  52. GRB 050520: OSN optical observations
  53. GRB 050520: BART optical limit
  54. GRB 050520 - A long GRB detected with INTEGRAL
  55. Swift-BAT trigger 122203 is not a real GRB
  56. GRB 050504: Swift XRT afterglow candidate has faded
  57. XRF 050509c optical afterglow
  58. GRB 050509B and short GRB-SN association? (corrected)
  59. GRB 050509B and short GRB-SN association?
  60. GRB 050509B: Subaru Optical Observations
  61. GRB050502b: Early Observation
  62. GRB050509b, Bok telescope B-band imaging
  63. Refined Chandra analysis of GRB 050509b
  64. GRB050509b, SDSS pre-burst observations
  65. GRB 050509b: Keck/Chandra Cross-Correlation
  66. GRB 050509b: Keck/Chandra Cross-Correlation
  67. Chandra observation of GRB 050509b
  68. GRB 050509b: RAPTOR deep, early limits.
  69. GRB050509B: Optical/Infared observations
  70. GRB 050509b: Swift/UVOT follow-up measurements
  71. GRB 050509b Milagro GeV/TeV Observations
  72. GRB050509B: Optical observations at the Very Large Telescope
  73. GRB 050509b: No Optical Variability in XRT Error Circle
  74. GRB 050509a: Swift-BAT refined analysis
  75. GRB 050509c: ROTSE-III Optical Limits
  76. GRB 050509B: WSRT Radio Observations
  77. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  78. GRB 050505, early TAROT observation
  79. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  80. GRB 050509b: Further Analysis of Keck LRIS Images
  81. GRB050509c: REM NIR and Optical observations
  82. GRB 050509b: Physical Properties of the Candidate Host galaxy
  83. GRB 050505: SARA Observations
  84. Swift UVOT Follow-up Observations of GRB 050509B
  85. GRB 050509B, Optical Observations
  86. GRB 050509B: Swift/XRT refined analysis
  87. GRB 050509b: Optical observations
  88. GRB 050509b: Precision Astrometry
  89. GRB 050509b: Possible Optical Counterpart
  90. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  91. GRB 050509A: Optical observations
  92. GRB 050509b: Optical Counterpart Candidate
  93. GRB 050509b: PAIRITEL and WIYN Observations
  94. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  95. GRB 050509b: optical observations
  96. GRB 050509b: Swift XRT Position
  97. GRB 050509B: ROTSE-III Optical Limits
  98. GRB 050509a: Swift XRT Position
  99. Swift-BAT detection of GRB 050507
  100. GRB 050505: Keck I-band Magnitude

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