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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"

28253 results found.

  1. Possible GRB050528: no candidate from Liverpool Telescope
  2. GRB050525a: Radio Observations
  3. GRB 050509b: refined XRT/Chandra afterglow position analysis
  4. GRB 050525: RTT150, Optical observations
  5. GRB 050525a: SARA Observations
  6. GRB 050525B: Swift-BAT observations
  7. GRB 050525: MITSuME Optical Observation in VRI
  8. GRB050525A,optical observation
  9. GRB050525: Super-LOTIS observations
  10. GRB 050525, spectral lag pseudo-redshift
  11. GRB050306: optical afterglow not confirmed
  12. GRB 050525: BART optical observation
  13. GRB 050525A: BOOTES simultaneous optical observations
  14. GRB 050525A: Swift-BAT refined analysis
  15. GRB050525: Optical observations
  16. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  17. Konus-Wind observation of GRB 050525
  18. GRB 050525: TAROT observations of the early afterglow
  19. INTEGRAL detection of GRB 050525
  20. GRB 050525, infrared observations
  21. GRB 050525: observatons of the optical afterglow
  22. GRB050525: ROTSE-III Refined Analysis
  23. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  24. XRF050522: Radio Observations
  25. Swift/UVOT observation of XRF 050522
  26. GRB 050509A: Further I-band imaging
  27. GRB050522,optical observation
  28. GRB050520,optical observation
  29. XRF 050522: Continued NIR P200 Monitoring
  30. RBO Observations of GRB050522
  31. Recent GRB BVRcIc field photometry
  32. GRB050520: Radio Observations
  33. XRF 050522: Swift XRT observation
  34. XRF050522, BVRcIc field photometry
  35. XRF050522: Optical Observations
  36. XRF050522: Near-infrared Observations
  37. GRB 050520: VLT/ULTRACAM observations
  38. GRB 050520: Swift XRT refined analysis
  39. XRF050509C: Chandra Afterglow Detection
  40. XRF050509c: Radio Observations
  41. GRB 050520: P200 Observations
  42. GRB 050520: TAROT optical limit
  43. GRB 050520: VLT/ULTRACAM observations
  44. XRF 050509c optical afterglow
  45. GRB 050509B and short GRB-SN association? (corrected)
  46. GRB 050509B and short GRB-SN association?
  47. GRB050502b: Early Observation
  48. GRB050509b, Bok telescope B-band imaging
  49. Refined Chandra analysis of GRB 050509b
  50. GRB050509b, SDSS pre-burst observations
  51. GRB 050509b: Keck/Chandra Cross-Correlation
  52. GRB 050509b: Keck/Chandra Cross-Correlation
  53. Chandra observation of GRB 050509b
  54. GRB 050509b: RAPTOR deep, early limits.
  55. GRB050509B: Optical observations at the Very Large Telescope
  56. GRB 050509b: No Optical Variability in XRT Error Circle
  57. GRB 050509a: Swift-BAT refined analysis
  58. GRB 050509c: ROTSE-III Optical Limits
  59. GRB 050505, early TAROT observation
  60. GRB050509c: REM NIR and Optical observations
  61. GRB 050509b: Physical Properties of the Candidate Host galaxy
  62. GRB 050505: SARA Observations
  63. GRB 050509B, Optical Observations
  64. GRB 050509B: Swift/XRT refined analysis
  65. GRB 050509b: Optical observations
  66. GRB 050509A: Optical observations
  67. GRB050509b: Radio Observations
  68. GRB 050509b: PAIRITEL and WIYN Observations
  69. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  70. Swift Detection of GRB050509b: A short duration burst
  71. Swift Detection of the Burst GRB050509
  72. GRB 050505: early time observations
  73. GRB 050505, simultaneous optical observation
  74. GRB050505: AAVSO observations
  75. GRB050416A : 1 GHz limit from GMRT
  76. GRB050505: Optical Afterglow Candidate
  77. GRB050505 Swift-BAT refined analysis
  78. GRB 050416b:Swift XRT afterglow upper limits
  79. GRB 050416b:Swift XRT afterglow upper limits
  80. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  81. GRB050502b: Afterglow Confirmation
  82. GRB050502: P200 Observations (Correction)
  83. GRB050502: P200 Observations
  84. GRB 050504 : R band observation at Lulin observatory
  85. Swift UVOT observation of GRB 050504
  86. GRB 050504, R band Observations
  87. GRB 050502b, V band Observations
  88. GRB050504: P60 Observations
  89. GRB 050504: A long GRB detected with INTEGRAL
  90. GRB (?) 050504: IR Observations, Intriguing Source
  91. GRB 050502b, Optical observations
  92. GRB050502a: P60 Observations (Correction)
  93. GRB050502a: P60 Observations
  94. Renewal of SGR 1806-20 activity
  95. GRB050502B Swift-BAT refined analysis
  96. Swift UVOT refined analysis
  97. GRB 050502a : R band observation at Lulin observatory
  98. GRB 050502b : optical observation at Lulin observatory
  99. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  100. Swift Detection of the Bright Burst GRB050502b

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