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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"

32720 results found.

  1. GRB050528: BOOTES optical candidate (retraction)
  2. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  3. GRB050525a: Radio Observations
  4. GRB 050509b: refined XRT/Chandra afterglow position analysis
  5. GRB050525a: optical upper limits
  6. GRB 050525a: SARA Observations
  7. GRB 050525B: Swift-BAT observations
  8. GRB 050525: MITSuME Optical Observation in VRI
  9. GRB 050525a: MDM Observations
  10. GRB050525A,optical observation
  11. GRB 050525 : Lulin optical afterglow observations
  12. GRB050525: Super-LOTIS observations
  13. GRB 050525, spectral lag pseudo-redshift
  14. GRB 050525a: Gemini/GMOS Spectra
  15. GRB050306: optical afterglow not confirmed
  16. GRB 050525: BART optical observation
  17. GRB 050525A: BOOTES simultaneous optical observations
  18. GRB 050525A: Swift-BAT refined analysis
  19. GRB050525: Optical observations
  20. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  21. Swift/UVOT UV and optical detections of GRB 050525
  22. Konus-Wind observation of GRB 050525
  23. GRB 050525: TAROT observations of the early afterglow
  24. INTEGRAL detection of GRB 050525
  25. GRB 050525, infrared observations
  26. GRB 050525: Optical observation
  27. GRB 050525: observatons of the optical afterglow
  28. GRB050525: ROTSE-III Refined Analysis
  29. GRB 050525 - Very Bright, Not Short
  30. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  31. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  32. XRF050522: NIR observations of XRT candidate
  33. XRF 050522: Swift XRT refined analysis
  34. XRF050522: Radio Observations
  35. Swift/UVOT observation of XRF 050522
  36. GRB 050509A: Further I-band imaging
  37. XRF 050522: Continued NIR P200 Monitoring
  38. RBO Observations of GRB050522
  39. GRB050520: Radio Observations
  40. XRF 050522: Swift XRT observation
  41. XRF050522, BVRcIc field photometry
  42. XRF 050522 : Lulin observations
  43. XRF050522: Optical Observations
  44. XRF050522: Near-infrared Observations
  45. XRF 050522: KAIT observations
  46. GRB 050520: VLT/ULTRACAM observations
  47. Swift UVOT Observations of GRB 050520
  48. GRB 050520: Swift XRT refined analysis
  49. XRF050509C: Chandra Afterglow Detection
  50. XRF 050509c: Swift XRT Upper Limit
  51. XRF050509c: Radio Observations
  52. RBO Observations of GRB050520
  53. GRB 050520: P200 Observations
  54. GRB050520: Liverpool Telescope follow-up
  55. GRB 050520: TAROT optical limit
  56. GRB 050520: Swift XRT position
  57. GRB 050520: VLT/ULTRACAM observations
  58. GRB 050520: OSN optical observations
  59. No Swift-BAT Lightcurves in real-time for next 3 weeks
  60. Swift-BAT trigger 122203 is not a real GRB
  61. XRF 050509C: REM NIR and Optical refined analysis
  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. GRB050502b: Early Observation
  68. GRB050509b, Bok telescope B-band imaging
  69. Refined Chandra analysis of GRB 050509b
  70. GRB050509b, SDSS pre-burst observations
  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. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  80. GRB 050509a: Swift-BAT refined analysis
  81. GRB 050509c: ROTSE-III Optical Limits
  82. GRB 050509B: WSRT Radio Observations
  83. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  84. GRB 050505, early TAROT observation
  85. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  86. GRB 050509b: Further Analysis of Keck LRIS Images
  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. GRB050509a: Swift UVOT observations
  93. GRB 050509b: Optical observations
  94. GRB 050509b: Precision Astrometry
  95. GRB 050509b: Possible Optical Counterpart
  96. GRB 050509A: Optical observations
  97. GRB 050509b: Optical Counterpart Candidate
  98. GRB050509b: Radio Observations
  99. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  100. GRB 050509b: optical observations

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