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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"

37582 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. XRF050522: Radio Observations
  9. GRB 050509A: Further I-band imaging
  10. GRB050522,optical observation
  11. GRB050520,optical observation
  12. XRF 050522: Continued NIR P200 Monitoring
  13. RBO Observations of GRB050522
  14. GRB050509b: optical observations
  15. Recent GRB BVRcIc field photometry
  16. GRB050520: Radio Observations
  17. XRF050522, BVRcIc field photometry
  18. XRF050522: Optical Observations
  19. XRF 050522: KAIT observations
  20. XRF 050522 detected with INTEGRAL
  21. GRB 050520: VLT/ULTRACAM observations
  22. Swift UVOT Observations of GRB 050520
  23. GRB 050520: Swift XRT refined analysis
  24. RBO Observations of GRB050520
  25. GRB 050520: P200 Observations
  26. GRB050520: Liverpool Telescope follow-up
  27. GRB 050520: TAROT optical limit
  28. GRB 050520: Swift XRT position
  29. GRB 050520: VLT/ULTRACAM observations
  30. GRB 050520: OSN optical observations
  31. GRB 050520: BART optical limit
  32. GRB 050520 - A long GRB detected with INTEGRAL
  33. Swift-BAT trigger 122203 is not a real GRB
  34. GRB 050504: Swift XRT afterglow candidate has faded
  35. XRF 050509c optical afterglow
  36. GRB 050509B and short GRB-SN association? (corrected)
  37. GRB 050509B and short GRB-SN association?
  38. GRB 050509B: Subaru Optical Observations
  39. GRB050502b: Early Observation
  40. GRB050509b, Bok telescope B-band imaging
  41. Refined Chandra analysis of GRB 050509b
  42. GRB050509b, SDSS pre-burst observations
  43. GRB 050509b: Keck/Chandra Cross-Correlation
  44. GRB 050509b: Keck/Chandra Cross-Correlation
  45. Chandra observation of GRB 050509b
  46. GRB 050509b: RAPTOR deep, early limits.
  47. GRB050509B: Optical/Infared observations
  48. GRB 050509b: Swift/UVOT follow-up measurements
  49. GRB 050509b Milagro GeV/TeV Observations
  50. GRB050509B: Optical observations at the Very Large Telescope
  51. GRB 050509b: No Optical Variability in XRT Error Circle
  52. GRB 050509a: Swift-BAT refined analysis
  53. GRB 050509c: ROTSE-III Optical Limits
  54. GRB 050509B: WSRT Radio Observations
  55. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  56. GRB 050505, early TAROT observation
  57. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  58. GRB 050509b: Further Analysis of Keck LRIS Images
  59. GRB050509c: REM NIR and Optical observations
  60. GRB 050509b: Physical Properties of the Candidate Host galaxy
  61. GRB 050505: SARA Observations
  62. Swift UVOT Follow-up Observations of GRB 050509B
  63. GRB 050509B, Optical Observations
  64. GRB 050509B: Swift/XRT refined analysis
  65. GRB 050509b: Optical observations
  66. GRB 050509b: Precision Astrometry
  67. GRB 050509b: Possible Optical Counterpart
  68. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  69. GRB 050509A: Optical observations
  70. GRB 050509b: Optical Counterpart Candidate
  71. GRB 050509b: PAIRITEL and WIYN Observations
  72. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  73. GRB 050509b: optical observations
  74. GRB 050509b: Swift XRT Position
  75. GRB 050509B: ROTSE-III Optical Limits
  76. GRB 050509a: Swift XRT Position
  77. Swift-BAT detection of GRB 050507
  78. GRB 050505: Keck I-band Magnitude
  79. GRB 050505: early time observations
  80. GRB 050505 - Faulkes Telescope North observations
  81. GRB 050502a: Swift XRT Upper Limit
  82. GRB 050505, simultaneous optical observation
  83. GRB 050505: Further Swift UVOT observations.
  84. GRB050505: AAVSO observations
  85. GRB050416A : 1 GHz limit from GMRT
  86. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  87. GRB 050505 UVOT
  88. GRB050505: Optical Afterglow Candidate
  89. GRB 050505: Swift XRT Position
  90. GRB 050502a: Optical Observations
  91. GRB 050416b:Swift XRT afterglow upper limits
  92. GRB 050416b:Swift XRT afterglow upper limits
  93. GRB 050504: Swift XRT position
  94. GRB050502: P200 Observations (Correction)
  95. GRB050502: P200 Observations
  96. GRB 050504 : R band observation at Lulin observatory
  97. Swift UVOT observation of GRB 050504
  98. GRB 050504, R band Observations
  99. GRB 050502b, V band Observations
  100. GRB050504: P60 Observations

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