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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"

32697 results found.

  1. INTEGRAL detection of GRB 050525
  2. GRB 050525, infrared observations
  3. GRB 050525: Optical observation
  4. GRB 050525: observatons of the optical afterglow
  5. GRB050525: ROTSE-III Refined Analysis
  6. GRB 050525 - Very Bright, Not Short
  7. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  8. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  9. XRF050522: NIR observations of XRT candidate
  10. XRF 050522: Swift XRT refined analysis
  11. XRF050522: Radio Observations
  12. Swift/UVOT observation of XRF 050522
  13. GRB 050509A: Further I-band imaging
  14. XRF 050522: Continued NIR P200 Monitoring
  15. RBO Observations of GRB050522
  16. GRB050520: Radio Observations
  17. XRF 050522: Swift XRT observation
  18. XRF050522, BVRcIc field photometry
  19. XRF 050522 : Lulin observations
  20. XRF050522: Optical Observations
  21. XRF050522: Near-infrared Observations
  22. XRF 050522: KAIT observations
  23. GRB 050520: VLT/ULTRACAM observations
  24. Swift UVOT Observations of GRB 050520
  25. GRB 050520: Swift XRT refined analysis
  26. XRF050509C: Chandra Afterglow Detection
  27. XRF 050509c: Swift XRT Upper Limit
  28. XRF050509c: Radio Observations
  29. RBO Observations of GRB050520
  30. GRB 050520: P200 Observations
  31. GRB050520: Liverpool Telescope follow-up
  32. GRB 050520: TAROT optical limit
  33. GRB 050520: Swift XRT position
  34. GRB 050520: VLT/ULTRACAM observations
  35. GRB 050520: OSN optical observations
  36. No Swift-BAT Lightcurves in real-time for next 3 weeks
  37. Swift-BAT trigger 122203 is not a real GRB
  38. XRF 050509C: REM NIR and Optical refined analysis
  39. GRB 050504: Swift XRT afterglow candidate has faded
  40. XRF 050509c optical afterglow
  41. GRB 050509B and short GRB-SN association? (corrected)
  42. GRB 050509B and short GRB-SN association?
  43. GRB 050509B: Subaru Optical Observations
  44. GRB050502b: Early Observation
  45. GRB050509b, Bok telescope B-band imaging
  46. Refined Chandra analysis of GRB 050509b
  47. GRB050509b, SDSS pre-burst observations
  48. GRB 050509b: Keck/Chandra Cross-Correlation
  49. Chandra observation of GRB 050509b
  50. GRB 050509b: RAPTOR deep, early limits.
  51. GRB050509B: Optical/Infared observations
  52. GRB 050509b: Swift/UVOT follow-up measurements
  53. GRB 050509b Milagro GeV/TeV Observations
  54. GRB050509B: Optical observations at the Very Large Telescope
  55. GRB 050509b: No Optical Variability in XRT Error Circle
  56. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  57. GRB 050509a: Swift-BAT refined analysis
  58. GRB 050509c: ROTSE-III Optical Limits
  59. GRB 050509B: WSRT Radio Observations
  60. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  61. GRB 050505, early TAROT observation
  62. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  63. GRB 050509b: Further Analysis of Keck LRIS Images
  64. GRB 050509b: Physical Properties of the Candidate Host galaxy
  65. GRB 050505: SARA Observations
  66. Swift UVOT Follow-up Observations of GRB 050509B
  67. GRB 050509B, Optical Observations
  68. GRB 050509B: Swift/XRT refined analysis
  69. GRB050509a: Swift UVOT observations
  70. GRB 050509b: Optical observations
  71. GRB 050509b: Precision Astrometry
  72. GRB 050509b: Possible Optical Counterpart
  73. GRB 050509A: Optical observations
  74. GRB 050509b: Optical Counterpart Candidate
  75. GRB050509b: Radio Observations
  76. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  77. GRB 050509b: optical observations
  78. GRB 050509b: Swift XRT Position
  79. GRB 050509B: ROTSE-III Optical Limits
  80. GRB 050509a: Swift XRT Position
  81. GRB 050505: Keck I-band Magnitude
  82. GRB 050505: early time observations
  83. GRB 050502a: Swift XRT Upper Limit
  84. GRB 050505, simultaneous optical observation
  85. GRB050505: Infrared observations
  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. GRB050505 Swift-BAT refined analysis
  94. GRB 050502a: Optical Observations
  95. GRB 050416b:Swift XRT afterglow upper limits
  96. GRB 050416b:Swift XRT afterglow upper limits
  97. Swift-BAT detection of GRB050505
  98. GRB 050504: Swift XRT position
  99. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  100. GRB050502b: Afterglow Confirmation

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