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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"

42845 results found.

  1. Swift/UVOT UV and optical detections of GRB 050525
  2. Konus-Wind observation of GRB 050525
  3. GRB 050525: TAROT observations of the early afterglow
  4. INTEGRAL detection of GRB 050525
  5. GRB 050525, infrared observations
  6. GRB 050525: Optical observation
  7. GRB 050525: observatons of the optical afterglow
  8. GRB050525: ROTSE-III Refined Analysis
  9. GRB 050525 - Very Bright, Not Short
  10. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  11. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  12. XRF050522: NIR observations of XRT candidate
  13. XRF 050522: Swift XRT refined analysis
  14. XRF050522: Radio Observations
  15. Swift/UVOT observation of XRF 050522
  16. GRB 050509A: Further I-band imaging
  17. GRB050522,optical observation
  18. GRB050520,optical observation
  19. XRF 050522: Continued NIR P200 Monitoring
  20. RBO Observations of GRB050522
  21. Recent GRB BVRcIc field photometry
  22. GRB050520: Radio Observations
  23. XRF 050522: Swift XRT observation
  24. XRF050522, BVRcIc field photometry
  25. XRF050522: Optical Observations
  26. XRF050522: Near-infrared Observations
  27. XRF 050522: KAIT observations
  28. XRF 050522 detected with INTEGRAL
  29. GRB 050520: VLT/ULTRACAM observations
  30. Swift UVOT Observations of GRB 050520
  31. GRB 050520: Swift XRT refined analysis
  32. XRF050509C: Chandra Afterglow Detection
  33. XRF 050509c: Swift XRT Upper Limit
  34. XRF050509c: Radio Observations
  35. RBO Observations of GRB050520
  36. GRB 050520: P200 Observations
  37. GRB050520: Liverpool Telescope follow-up
  38. RBO Observations of GRB050520
  39. GRB 050520: TAROT optical limit
  40. GRB 050520: Swift XRT position
  41. GRB 050520: VLT/ULTRACAM observations
  42. GRB 050520: OSN optical observations
  43. GRB 050520 - A long GRB detected with INTEGRAL
  44. No Swift-BAT Lightcurves in real-time for next 3 weeks
  45. Swift-BAT trigger 122203 is not a real GRB
  46. XRF 050509C: REM NIR and Optical refined analysis
  47. GRB 050504: Swift XRT afterglow candidate has faded
  48. XRF 050509c optical afterglow
  49. GRB 050509B and short GRB-SN association? (corrected)
  50. GRB 050509B and short GRB-SN association?
  51. GRB050502b: Early Observation
  52. GRB050509b, Bok telescope B-band imaging
  53. GRB050509b, SDSS pre-burst observations
  54. GRB 050509b: Keck/Chandra Cross-Correlation
  55. GRB 050509b: Keck/Chandra Cross-Correlation
  56. Chandra observation of GRB 050509b
  57. GRB 050509b: RAPTOR deep, early limits.
  58. GRB050509B: Optical/Infared observations
  59. GRB 050509b: Swift/UVOT follow-up measurements
  60. GRB 050509b Milagro GeV/TeV Observations
  61. GRB050509B: Optical observations at the Very Large Telescope
  62. GRB 050509b: No Optical Variability in XRT Error Circle
  63. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  64. GRB 050509a: Swift-BAT refined analysis
  65. GRB 050509c: ROTSE-III Optical Limits
  66. GRB 050509B: WSRT Radio Observations
  67. GRB 050505, early TAROT observation
  68. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  69. GRB 050509b: Further Analysis of Keck LRIS Images
  70. GRB050509c: REM NIR and Optical observations
  71. GRB 050509b: Physical Properties of the Candidate Host galaxy
  72. GRB 050505: SARA Observations
  73. Swift UVOT Follow-up Observations of GRB 050509B
  74. GRB 050509B: Swift/XRT refined analysis
  75. GRB050509a: Swift UVOT observations
  76. GRB 050509b: Precision Astrometry
  77. GRB 050509b: Possible Optical Counterpart
  78. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  79. GRB 050509A: Optical observations
  80. GRB 050509b: Optical Counterpart Candidate
  81. GRB050509b: Radio Observations
  82. GRB 050509b: PAIRITEL and WIYN Observations
  83. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  84. GRB 050509b: optical observations
  85. GRB 050509b: Swift XRT Position
  86. GRB 050509B: ROTSE-III Optical Limits
  87. Swift Detection of GRB050509b: A short duration burst
  88. GRB 050509a: Swift XRT Position
  89. Swift Detection of the Burst GRB050509
  90. Swift-BAT detection of GRB 050507
  91. GRB 050505: Keck I-band Magnitude
  92. GRB 050505: early time observations
  93. GRB 050505 - Faulkes Telescope North observations
  94. GRB 050502a: Swift XRT Upper Limit
  95. GRB 050505, simultaneous optical observation
  96. GRB050505: Infrared observations
  97. GRB 050505: Further Swift UVOT observations.
  98. GRB050505: AAVSO observations
  99. GRB050416A : 1 GHz limit from GMRT
  100. GRB 050505: Keck absorption spectrum and redshift (z=4.27)

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