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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"

36085 results found.

  1. GRB 050525: TAROT observations of the early afterglow
  2. INTEGRAL detection of GRB 050525
  3. GRB 050525, infrared observations
  4. GRB 050525: Optical observation
  5. GRB 050525: observatons of the optical afterglow
  6. GRB050525: ROTSE-III Refined Analysis
  7. GRB 050525 - Very Bright, Not Short
  8. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  9. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  10. XRF050522: NIR observations of XRT candidate
  11. XRF050522: Radio Observations
  12. GRB 050509A: Further I-band imaging
  13. GRB050522,optical observation
  14. GRB050520,optical observation
  15. XRF 050522: Continued NIR P200 Monitoring
  16. RBO Observations of GRB050522
  17. GRB050509b: optical observations
  18. Recent GRB BVRcIc field photometry
  19. GRB050520: Radio Observations
  20. XRF050522, BVRcIc field photometry
  21. XRF050522: Optical Observations
  22. XRF 050522: KAIT observations
  23. XRF 050522 detected with INTEGRAL
  24. GRB 050520: VLT/ULTRACAM observations
  25. Swift UVOT Observations of GRB 050520
  26. GRB 050520: Swift XRT refined analysis
  27. RBO Observations of GRB050520
  28. GRB 050520: P200 Observations
  29. GRB050520: Liverpool Telescope follow-up
  30. GRB 050520: TAROT optical limit
  31. GRB 050520: Swift XRT position
  32. GRB 050520: VLT/ULTRACAM observations
  33. GRB 050520: OSN optical observations
  34. GRB 050520: BART optical limit
  35. GRB 050520 - A long GRB detected with INTEGRAL
  36. Swift-BAT trigger 122203 is not a real GRB
  37. GRB 050504: Swift XRT afterglow candidate has faded
  38. XRF 050509c optical afterglow
  39. GRB 050509B and short GRB-SN association? (corrected)
  40. GRB 050509B and short GRB-SN association?
  41. GRB 050509B: Subaru Optical Observations
  42. GRB050502b: Early Observation
  43. GRB050509b, Bok telescope B-band imaging
  44. Refined Chandra analysis of GRB 050509b
  45. GRB050509b, SDSS pre-burst observations
  46. GRB 050509b: Keck/Chandra Cross-Correlation
  47. GRB 050509b: Keck/Chandra Cross-Correlation
  48. Chandra observation of GRB 050509b
  49. GRB 050509b: RAPTOR deep, early limits.
  50. GRB050509B: Optical/Infared observations
  51. GRB 050509b: Swift/UVOT follow-up measurements
  52. GRB 050509b Milagro GeV/TeV Observations
  53. GRB050509B: Optical observations at the Very Large Telescope
  54. GRB 050509b: No Optical Variability in XRT Error Circle
  55. GRB 050509a: Swift-BAT refined analysis
  56. GRB 050509c: ROTSE-III Optical Limits
  57. GRB 050509B: WSRT Radio Observations
  58. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  59. GRB 050505, early TAROT observation
  60. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  61. GRB 050509b: Further Analysis of Keck LRIS Images
  62. GRB050509c: REM NIR and Optical observations
  63. GRB 050509b: Physical Properties of the Candidate Host galaxy
  64. GRB 050505: SARA Observations
  65. Swift UVOT Follow-up Observations of GRB 050509B
  66. GRB 050509B, Optical Observations
  67. GRB 050509B: Swift/XRT refined analysis
  68. GRB 050509b: Optical observations
  69. GRB 050509b: Precision Astrometry
  70. GRB 050509b: Possible Optical Counterpart
  71. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  72. GRB 050509A: Optical observations
  73. GRB 050509b: Optical Counterpart Candidate
  74. GRB 050509b: PAIRITEL and WIYN Observations
  75. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  76. GRB 050509b: optical observations
  77. GRB 050509b: Swift XRT Position
  78. GRB 050509B: ROTSE-III Optical Limits
  79. GRB 050509a: Swift XRT Position
  80. Swift-BAT detection of GRB 050507
  81. GRB 050505: Keck I-band Magnitude
  82. GRB 050505: early time observations
  83. GRB 050505 - Faulkes Telescope North observations
  84. GRB 050502a: Swift XRT Upper Limit
  85. GRB 050505, simultaneous optical observation
  86. GRB 050505: Further Swift UVOT observations.
  87. GRB050505: AAVSO observations
  88. GRB050416A : 1 GHz limit from GMRT
  89. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  90. GRB 050505 UVOT
  91. GRB050505: Optical Afterglow Candidate
  92. GRB 050505: Swift XRT Position
  93. GRB 050502a: Optical Observations
  94. GRB 050416b:Swift XRT afterglow upper limits
  95. GRB 050416b:Swift XRT afterglow upper limits
  96. GRB 050504: Swift XRT position
  97. GRB050502: P200 Observations (Correction)
  98. GRB050502: P200 Observations
  99. GRB 050504 : R band observation at Lulin observatory
  100. Swift UVOT observation of GRB 050504

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