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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"

36105 results found.

  1. GRB 050525: RTT150, Optical observations
  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. GRB 050525: pseudo-redshift
  19. Swift/UVOT UV and optical detections of GRB 050525
  20. Konus-Wind observation of GRB 050525
  21. GRB 050525: TAROT observations of the early afterglow
  22. INTEGRAL detection of GRB 050525
  23. GRB 050525, infrared observations
  24. GRB 050525: Optical observation
  25. GRB 050525: observatons of the optical afterglow
  26. GRB050525: ROTSE-III Refined Analysis
  27. GRB 050525 - Very Bright, Not Short
  28. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  29. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  30. XRF050522: NIR observations of XRT candidate
  31. XRF050522: Radio Observations
  32. GRB 050509A: Further I-band imaging
  33. GRB050522,optical observation
  34. GRB050520,optical observation
  35. XRF 050522: Continued NIR P200 Monitoring
  36. RBO Observations of GRB050522
  37. GRB050509b: optical observations
  38. Recent GRB BVRcIc field photometry
  39. GRB050520: Radio Observations
  40. XRF050522, BVRcIc field photometry
  41. XRF050522: Optical Observations
  42. XRF 050522: KAIT observations
  43. XRF 050522 detected with INTEGRAL
  44. GRB 050520: VLT/ULTRACAM observations
  45. Swift UVOT Observations of GRB 050520
  46. GRB 050520: Swift XRT refined analysis
  47. RBO Observations of GRB050520
  48. GRB 050520: P200 Observations
  49. GRB050520: Liverpool Telescope follow-up
  50. GRB 050520: TAROT optical limit
  51. GRB 050520: Swift XRT position
  52. GRB 050520: VLT/ULTRACAM observations
  53. GRB 050520: OSN optical observations
  54. GRB 050520: BART optical limit
  55. GRB 050520 - A long GRB detected with INTEGRAL
  56. Swift-BAT trigger 122203 is not a real GRB
  57. GRB 050504: Swift XRT afterglow candidate has faded
  58. XRF 050509c optical afterglow
  59. GRB 050509B and short GRB-SN association? (corrected)
  60. GRB 050509B and short GRB-SN association?
  61. GRB 050509B: Subaru Optical Observations
  62. GRB050502b: Early Observation
  63. GRB050509b, Bok telescope B-band imaging
  64. Refined Chandra analysis of GRB 050509b
  65. GRB050509b, SDSS pre-burst observations
  66. GRB 050509b: Keck/Chandra Cross-Correlation
  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. GRB 050509a: Swift-BAT refined analysis
  76. GRB 050509c: ROTSE-III Optical Limits
  77. GRB 050509B: WSRT Radio Observations
  78. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  79. GRB 050505, early TAROT observation
  80. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  81. GRB 050509b: Further Analysis of Keck LRIS Images
  82. GRB050509c: REM NIR and Optical observations
  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. GRB 050509b: Optical observations
  89. GRB 050509b: Precision Astrometry
  90. GRB 050509b: Possible Optical Counterpart
  91. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  92. GRB 050509A: Optical observations
  93. GRB 050509b: Optical Counterpart Candidate
  94. GRB 050509b: PAIRITEL and WIYN 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. Swift-BAT detection of GRB 050507

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