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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"

21929 results found.

  1. GRB 050607: Optical decay and spectral slope
  2. GRB 050607: MDM Observations
  3. GRB 050607 - XRT refined data analysis
  4. Optical Afterglow of GRB 050607
  5. GRB050607: P60 Observations
  6. GRB050607: prompt REM observations
  7. GRB 050603: prediction of t_break
  8. GRB 050603 - XRT data analysis of the first day
  9. GRB 050603: Analysis of UVOT data
  10. GRB050603: Fading Afterglow observed by Swift UVOT
  11. GRB050603, submillimetre observations
  12. GRB 050603: Swift XRT Position
  13. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  14. Swift/BAT Detection of GRB050603
  15. GRB 050408: jet break in the XRT light curve
  16. GRB 050525a, infrared observations
  17. GRB 050525a, SMARTS optical/IR afterglow observations
  18. GRB050528, XRT observations
  19. GRB050528: updated Liverpool Telescope limits
  20. Possible GRB050528: no candidate from Liverpool Telescope
  21. GRB050525a: Radio Observations
  22. GRB 050509b: refined XRT/Chandra afterglow position analysis
  23. GRB 050525: RTT150, Optical observations
  24. GRB 050525a: SARA Observations
  25. GRB 050525B: Swift-BAT observations
  26. GRB 050525a: MDM Observations
  27. GRB 050525 : Lulin optical afterglow observations
  28. GRB050525: Super-LOTIS observations
  29. GRB 050525a: Gemini/GMOS Spectra
  30. GRB050306: optical afterglow not confirmed
  31. GRB 050525A: BOOTES simultaneous optical observations
  32. GRB050525: Optical observations
  33. GRB 050525: TAROT observations of the early afterglow
  34. GRB 050525, infrared observations
  35. GRB 050525: observatons of the optical afterglow
  36. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  37. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  38. XRF050522: NIR observations of XRT candidate
  39. XRF 050522: Swift XRT refined analysis
  40. XRF050522: Radio Observations
  41. XRF 050522: Continued NIR P200 Monitoring
  42. RBO Observations of GRB050522
  43. GRB050509b: optical observations
  44. GRB050520: Radio Observations
  45. XRF 050522: Swift XRT observation
  46. XRF050522, BVRcIc field photometry
  47. XRF 050522 : Lulin observations
  48. XRF050522: Optical Observations
  49. XRF050522: Near-infrared Observations
  50. XRF 050522: KAIT observations
  51. GRB 050520: VLT/ULTRACAM observations
  52. Swift UVOT Observations of GRB 050520
  53. XRF 050509c: Swift XRT Upper Limit
  54. XRF050509c: Radio Observations
  55. RBO Observations of GRB050520
  56. GRB 050520: P200 Observations
  57. RBO Observations of GRB050520
  58. GRB 050520: TAROT optical limit
  59. GRB 050520: Swift XRT position
  60. GRB 050520: VLT/ULTRACAM observations
  61. GRB 050520: OSN optical observations
  62. GRB 050504: Swift XRT afterglow candidate has faded
  63. XRF 050509c optical afterglow
  64. GRB 050509B and short GRB-SN association? (corrected)
  65. GRB 050509B and short GRB-SN association?
  66. GRB 050509B: Subaru Optical Observations
  67. GRB050509b, Bok telescope B-band imaging
  68. GRB050509b, SDSS pre-burst observations
  69. GRB 050509b: Keck/Chandra Cross-Correlation
  70. Chandra observation of GRB 050509b
  71. GRB050509B: Optical/Infared observations
  72. GRB 050509b Milagro GeV/TeV Observations
  73. GRB050509B: Optical observations at the Very Large Telescope
  74. GRB 050509b: No Optical Variability in XRT Error Circle
  75. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  76. GRB 050509B: WSRT Radio Observations
  77. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  78. GRB 050505, early TAROT observation
  79. GRB 050509b: Further Analysis of Keck LRIS Images
  80. GRB050509c: REM NIR and Optical observations
  81. GRB 050509b: Physical Properties of the Candidate Host galaxy
  82. GRB 050505: SARA Observations
  83. Swift UVOT Follow-up Observations of GRB 050509B
  84. GRB 050509B, Optical Observations
  85. GRB050509a: Swift UVOT observations
  86. GRB 050509b: Optical observations
  87. GRB 050509b: Precision Astrometry
  88. GRB 050509b: Possible Optical Counterpart
  89. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  90. GRB 050509A: Optical observations
  91. GRB 050509b: Optical Counterpart Candidate
  92. GRB050509b: Radio Observations
  93. GRB 050509b: PAIRITEL and WIYN Observations
  94. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  95. GRB 050509b: optical observations
  96. GRB 050509b: Swift XRT Position
  97. Swift Detection of GRB050509b: A short duration burst
  98. Swift Detection of the Burst GRB050509
  99. GRB 050505: early time observations
  100. GRB 050505 - Faulkes Telescope North observations

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