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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"

39348 results found.

  1. GRB 050525: Optical observation
  2. GRB 050525: observatons of the optical afterglow
  3. GRB050525: ROTSE-III Refined Analysis
  4. GRB 050525 - Very Bright, Not Short
  5. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  6. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  7. XRF050522: NIR observations of XRT candidate
  8. XRF 050522: Swift XRT refined analysis
  9. XRF050522: Radio Observations
  10. GRB 050509A: Further I-band imaging
  11. GRB050522,optical observation
  12. GRB050520,optical observation
  13. XRF 050522: Continued NIR P200 Monitoring
  14. RBO Observations of GRB050522
  15. GRB050509b: optical observations
  16. Recent GRB BVRcIc field photometry
  17. GRB050520: Radio Observations
  18. XRF 050522: Swift XRT observation
  19. XRF050522, BVRcIc field photometry
  20. XRF050522: Optical Observations
  21. XRF 050522: KAIT observations
  22. XRF 050522 detected with INTEGRAL
  23. GRB 050520: VLT/ULTRACAM observations
  24. Swift UVOT Observations of GRB 050520
  25. GRB 050520: Swift XRT refined analysis
  26. RBO Observations of GRB050520
  27. GRB 050520: P200 Observations
  28. GRB050520: Liverpool Telescope follow-up
  29. GRB 050520: TAROT optical limit
  30. GRB 050520: Swift XRT position
  31. GRB 050520: VLT/ULTRACAM observations
  32. GRB 050520: OSN optical observations
  33. GRB 050520: BART optical limit
  34. GRB 050520 - A long GRB detected with INTEGRAL
  35. Swift-BAT trigger 122203 is not a real GRB
  36. GRB 050504: Swift XRT afterglow candidate has faded
  37. XRF 050509c optical afterglow
  38. GRB 050509B and short GRB-SN association? (corrected)
  39. GRB 050509B and short GRB-SN association?
  40. GRB 050509B: Subaru Optical Observations
  41. GRB050502b: Early Observation
  42. GRB050509b, Bok telescope B-band imaging
  43. Refined Chandra analysis of GRB 050509b
  44. GRB050509b, SDSS pre-burst observations
  45. GRB 050509b: Keck/Chandra Cross-Correlation
  46. GRB 050509b: Keck/Chandra Cross-Correlation
  47. Chandra observation of GRB 050509b
  48. GRB 050509b: RAPTOR deep, early limits.
  49. GRB050509B: Optical/Infared observations
  50. GRB 050509b: Swift/UVOT follow-up measurements
  51. GRB 050509b Milagro GeV/TeV Observations
  52. GRB050509B: Optical observations at the Very Large Telescope
  53. GRB 050509b: No Optical Variability in XRT Error Circle
  54. GRB 050509a: Swift-BAT refined analysis
  55. GRB 050509c: ROTSE-III Optical Limits
  56. GRB 050509B: WSRT Radio Observations
  57. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  58. GRB 050505, early TAROT observation
  59. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  60. GRB 050509b: Further Analysis of Keck LRIS Images
  61. GRB050509c: REM NIR and Optical observations
  62. GRB 050509b: Physical Properties of the Candidate Host galaxy
  63. GRB 050505: SARA Observations
  64. Swift UVOT Follow-up Observations of GRB 050509B
  65. GRB 050509B, Optical Observations
  66. GRB 050509B: Swift/XRT refined analysis
  67. GRB 050509b: Optical observations
  68. GRB 050509b: Precision Astrometry
  69. GRB 050509b: Possible Optical Counterpart
  70. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  71. GRB 050509A: Optical observations
  72. GRB 050509b: Optical Counterpart Candidate
  73. GRB 050509b: PAIRITEL and WIYN Observations
  74. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  75. GRB 050509b: optical observations
  76. GRB 050509b: Swift XRT Position
  77. GRB 050509B: ROTSE-III Optical Limits
  78. Swift Detection of GRB050509b: A short duration burst
  79. GRB 050509a: Swift XRT Position
  80. Swift Detection of the Burst GRB050509
  81. Swift-BAT detection of GRB 050507
  82. GRB 050505: Keck I-band Magnitude
  83. GRB 050505: early time observations
  84. GRB 050505 - Faulkes Telescope North observations
  85. GRB 050502a: Swift XRT Upper Limit
  86. GRB 050505, simultaneous optical observation
  87. GRB 050505: Further Swift UVOT observations.
  88. GRB050505: AAVSO observations
  89. GRB050416A : 1 GHz limit from GMRT
  90. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  91. GRB 050505 UVOT
  92. GRB050505: Optical Afterglow Candidate
  93. GRB 050505: Swift XRT Position
  94. GRB050505 Swift-BAT refined analysis
  95. GRB 050502a: Optical Observations
  96. GRB 050416b:Swift XRT afterglow upper limits
  97. GRB 050416b:Swift XRT afterglow upper limits
  98. Swift-BAT detection of GRB050505
  99. GRB 050504: Swift XRT position
  100. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates

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