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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"

23690 results found.

  1. Swift/UVOT observations of GRB050607
  2. GRB 050607 : Lulin R-band observation
  3. GRB 050607: PROMPT VRcIc Observations
  4. GRB 050607: RAPTOR-S Early Optical Limits
  5. GRB050607: KAIT optical limits
  6. GRB 050525a, Mid-Infrared Observations
  7. GRB 050607 - XRT refined data analysis
  8. GRB050607: prompt REM observations
  9. Limits on a SN in the field of GRB 050509b
  10. GRB 050603 - XRT data analysis of the first day
  11. Konus-Wind observation of GRB 050603
  12. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  13. GRB 050408: jet break in the XRT light curve
  14. GRB050528, XRT observations
  15. Swift-BAT GRB 050528: a soft burst
  16. Update on Swift-BAT GRB 050528 (Trigger 130679)
  17. Swift-BAT detection of possible GRB 050528
  18. GRB 050509b: refined XRT/Chandra afterglow position analysis
  19. GRB 050525: RTT150, Optical observations
  20. GRB 050525a: SARA Observations
  21. GRB 050525B: Swift-BAT observations
  22. GRB 050525 : Lulin optical afterglow observations
  23. GRB 050525A: BOOTES simultaneous optical observations
  24. GRB 050525A: Swift-BAT refined analysis
  25. GRB050525: Optical observations
  26. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  27. Swift/UVOT UV and optical detections of GRB 050525
  28. Konus-Wind observation of GRB 050525
  29. GRB 050525: TAROT observations of the early afterglow
  30. INTEGRAL detection of GRB 050525
  31. GRB 050525: observatons of the optical afterglow
  32. GRB 050525 - Very Bright, Not Short
  33. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  34. XRF 050522: Swift XRT refined analysis
  35. GRB 050509A: Further I-band imaging
  36. GRB050509b: optical observations
  37. Recent GRB BVRcIc field photometry
  38. GRB050520: Radio Observations
  39. XRF 050522: Swift XRT observation
  40. XRF050522, BVRcIc field photometry
  41. XRF 050522 : Lulin observations
  42. XRF050522: Optical Observations
  43. XRF050522: Near-infrared Observations
  44. XRF 050522: KAIT observations
  45. XRF 050522 detected with INTEGRAL
  46. Swift UVOT Observations of GRB 050520
  47. GRB 050520: Swift XRT refined analysis
  48. XRF050509c: Radio Observations
  49. GRB 050520: P200 Observations
  50. GRB050520: Liverpool Telescope follow-up
  51. GRB 050520: TAROT optical limit
  52. GRB 050520: Swift XRT position
  53. GRB 050520: OSN optical observations
  54. GRB 050520 - A long GRB detected with INTEGRAL
  55. No Swift-BAT Lightcurves in real-time for next 3 weeks
  56. XRF 050509C: REM NIR and Optical refined analysis
  57. XRF 050509c optical afterglow
  58. GRB 050509B and short GRB-SN association? (corrected)
  59. GRB 050509B and short GRB-SN association?
  60. GRB 050509B: Subaru Optical Observations
  61. GRB050502b: Early Observation
  62. GRB050509b, Bok telescope B-band imaging
  63. GRB050509b, SDSS pre-burst observations
  64. GRB 050509b: Keck/Chandra Cross-Correlation
  65. GRB 050509b: Keck/Chandra Cross-Correlation
  66. GRB050509B: Optical/Infared observations
  67. GRB 050509b: Swift/UVOT follow-up measurements
  68. GRB050509B: Optical observations at the Very Large Telescope
  69. GRB 050509b: No Optical Variability in XRT Error Circle
  70. GRB 050509a: Swift-BAT refined analysis
  71. GRB 050505, early TAROT observation
  72. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  73. GRB050509c: REM NIR and Optical observations
  74. GRB 050505: SARA Observations
  75. Swift UVOT Follow-up Observations of GRB 050509B
  76. GRB 050509B, Optical Observations
  77. GRB 050509B: Swift/XRT refined analysis
  78. GRB050509a: Swift UVOT observations
  79. GRB 050509b: Optical observations
  80. GRB 050509b: Precision Astrometry
  81. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  82. GRB 050509A: Optical observations
  83. GRB 050509b: Optical Counterpart Candidate
  84. GRB050509b: Radio Observations
  85. GRB 050509b: PAIRITEL and WIYN Observations
  86. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  87. GRB 050509b: optical observations
  88. GRB 050509b: Swift XRT Position
  89. Swift Detection of GRB050509b: A short duration burst
  90. GRB 050509a: Swift XRT Position
  91. GRB 050505: Keck I-band Magnitude
  92. GRB 050505: early time observations
  93. GRB 050505 - Faulkes Telescope North observations
  94. GRB 050505, simultaneous optical observation
  95. GRB 050505: Further Swift UVOT observations.
  96. GRB050505: AAVSO observations
  97. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  98. GRB 050505 UVOT
  99. GRB050505: Optical Afterglow Candidate
  100. GRB 050505: Swift XRT Position

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