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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"

36215 results found.

  1. Possible GRB050528: no candidate from Liverpool Telescope
  2. Swift-BAT detection of possible GRB 050528
  3. GRB050525a: Radio Observations
  4. GRB 050509b: refined XRT/Chandra afterglow position analysis
  5. GRB 050525: RTT150, Optical observations
  6. GRB050525a: optical upper limits
  7. GRB 050525a: SARA Observations
  8. GRB 050525B: Swift-BAT observations
  9. GRB 050525: MITSuME Optical Observation in VRI
  10. GRB 050525a: MDM Observations
  11. GRB050525A,optical observation
  12. GRB 050525 : Lulin optical afterglow observations
  13. GRB050525: Super-LOTIS observations
  14. GRB 050525, spectral lag pseudo-redshift
  15. GRB 050525a: Gemini/GMOS Spectra
  16. GRB050306: optical afterglow not confirmed
  17. GRB 050525: BART optical observation
  18. GRB 050525A: BOOTES simultaneous optical observations
  19. GRB 050525A: Swift-BAT refined analysis
  20. GRB050525: Optical observations
  21. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  22. GRB 050525: pseudo-redshift
  23. Swift/UVOT UV and optical detections of GRB 050525
  24. Konus-Wind observation of GRB 050525
  25. GRB 050525: TAROT observations of the early afterglow
  26. INTEGRAL detection of GRB 050525
  27. GRB 050525, infrared observations
  28. GRB 050525: Optical observation
  29. GRB 050525: observatons of the optical afterglow
  30. GRB050525: ROTSE-III Refined Analysis
  31. GRB 050525 - Very Bright, Not Short
  32. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  33. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  34. XRF050522: NIR observations of XRT candidate
  35. XRF050522: Radio Observations
  36. GRB 050509A: Further I-band imaging
  37. GRB050522,optical observation
  38. GRB050520,optical observation
  39. XRF 050522: Continued NIR P200 Monitoring
  40. RBO Observations of GRB050522
  41. GRB050509b: optical observations
  42. Recent GRB BVRcIc field photometry
  43. GRB050520: Radio Observations
  44. XRF050522, BVRcIc field photometry
  45. XRF050522: Optical Observations
  46. XRF 050522: KAIT observations
  47. XRF 050522 detected with INTEGRAL
  48. GRB 050520: VLT/ULTRACAM observations
  49. Swift UVOT Observations of GRB 050520
  50. GRB 050520: Swift XRT refined analysis
  51. RBO Observations of GRB050520
  52. GRB 050520: P200 Observations
  53. GRB050520: Liverpool Telescope follow-up
  54. GRB 050520: TAROT optical limit
  55. GRB 050520: Swift XRT position
  56. GRB 050520: VLT/ULTRACAM observations
  57. GRB 050520: OSN optical observations
  58. GRB 050520: BART optical limit
  59. GRB 050520 - A long GRB detected with INTEGRAL
  60. Swift-BAT trigger 122203 is not a real GRB
  61. GRB 050504: Swift XRT afterglow candidate has faded
  62. XRF 050509c optical afterglow
  63. GRB 050509B and short GRB-SN association? (corrected)
  64. GRB 050509B and short GRB-SN association?
  65. GRB 050509B: Subaru Optical Observations
  66. GRB050502b: Early Observation
  67. GRB050509b, Bok telescope B-band imaging
  68. Refined Chandra analysis of GRB 050509b
  69. GRB050509b, SDSS pre-burst observations
  70. GRB 050509b: Keck/Chandra Cross-Correlation
  71. GRB 050509b: Keck/Chandra Cross-Correlation
  72. Chandra observation of GRB 050509b
  73. GRB 050509b: RAPTOR deep, early limits.
  74. GRB050509B: Optical/Infared observations
  75. GRB 050509b: Swift/UVOT follow-up measurements
  76. GRB 050509b Milagro GeV/TeV Observations
  77. GRB050509B: Optical observations at the Very Large Telescope
  78. GRB 050509b: No Optical Variability in XRT Error Circle
  79. GRB 050509a: Swift-BAT refined analysis
  80. GRB 050509c: ROTSE-III Optical Limits
  81. GRB 050509B: WSRT Radio Observations
  82. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  83. GRB 050505, early TAROT observation
  84. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  85. GRB 050509b: Further Analysis of Keck LRIS Images
  86. GRB050509c: REM NIR and Optical observations
  87. GRB 050509b: Physical Properties of the Candidate Host galaxy
  88. GRB 050505: SARA Observations
  89. Swift UVOT Follow-up Observations of GRB 050509B
  90. GRB 050509B, Optical Observations
  91. GRB 050509B: Swift/XRT refined analysis
  92. GRB 050509b: Optical observations
  93. GRB 050509b: Precision Astrometry
  94. GRB 050509b: Possible Optical Counterpart
  95. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  96. GRB 050509A: Optical observations
  97. GRB 050509b: Optical Counterpart Candidate
  98. GRB 050509b: PAIRITEL and WIYN Observations
  99. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  100. GRB 050509b: optical observations

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