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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"

28246 results found.

  1. GRB050525A,optical observation
  2. GRB050525: Super-LOTIS observations
  3. GRB 050525, spectral lag pseudo-redshift
  4. GRB050306: optical afterglow not confirmed
  5. GRB 050525: BART optical observation
  6. GRB 050525A: BOOTES simultaneous optical observations
  7. GRB 050525A: Swift-BAT refined analysis
  8. GRB050525: Optical observations
  9. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  10. Konus-Wind observation of GRB 050525
  11. GRB 050525: TAROT observations of the early afterglow
  12. INTEGRAL detection of GRB 050525
  13. GRB 050525, infrared observations
  14. GRB 050525: observatons of the optical afterglow
  15. GRB050525: ROTSE-III Refined Analysis
  16. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  17. XRF050522: Radio Observations
  18. Swift/UVOT observation of XRF 050522
  19. GRB 050509A: Further I-band imaging
  20. GRB050522,optical observation
  21. GRB050520,optical observation
  22. XRF 050522: Continued NIR P200 Monitoring
  23. RBO Observations of GRB050522
  24. Recent GRB BVRcIc field photometry
  25. GRB050520: Radio Observations
  26. XRF 050522: Swift XRT observation
  27. XRF050522, BVRcIc field photometry
  28. XRF050522: Optical Observations
  29. XRF050522: Near-infrared Observations
  30. GRB 050520: VLT/ULTRACAM observations
  31. GRB 050520: Swift XRT refined analysis
  32. XRF050509C: Chandra Afterglow Detection
  33. XRF050509c: Radio Observations
  34. GRB 050520: P200 Observations
  35. GRB 050520: TAROT optical limit
  36. GRB 050520: VLT/ULTRACAM observations
  37. XRF 050509c optical afterglow
  38. GRB 050509B and short GRB-SN association? (corrected)
  39. GRB 050509B and short GRB-SN association?
  40. GRB050502b: Early Observation
  41. GRB050509b, Bok telescope B-band imaging
  42. Refined Chandra analysis of GRB 050509b
  43. GRB050509b, SDSS pre-burst observations
  44. GRB 050509b: Keck/Chandra Cross-Correlation
  45. GRB 050509b: Keck/Chandra Cross-Correlation
  46. Chandra observation of GRB 050509b
  47. GRB 050509b: RAPTOR deep, early limits.
  48. GRB050509B: Optical observations at the Very Large Telescope
  49. GRB 050509b: No Optical Variability in XRT Error Circle
  50. GRB 050509a: Swift-BAT refined analysis
  51. GRB 050509c: ROTSE-III Optical Limits
  52. GRB 050505, early TAROT observation
  53. GRB050509c: REM NIR and Optical observations
  54. GRB 050509b: Physical Properties of the Candidate Host galaxy
  55. GRB 050505: SARA Observations
  56. GRB 050509B, Optical Observations
  57. GRB 050509B: Swift/XRT refined analysis
  58. GRB 050509b: Optical observations
  59. GRB 050509A: Optical observations
  60. GRB050509b: Radio Observations
  61. GRB 050509b: PAIRITEL and WIYN Observations
  62. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  63. Swift Detection of GRB050509b: A short duration burst
  64. Swift Detection of the Burst GRB050509
  65. GRB 050505: early time observations
  66. GRB 050505, simultaneous optical observation
  67. GRB050505: AAVSO observations
  68. GRB050416A : 1 GHz limit from GMRT
  69. GRB050505: Optical Afterglow Candidate
  70. GRB050505 Swift-BAT refined analysis
  71. GRB 050416b:Swift XRT afterglow upper limits
  72. GRB 050416b:Swift XRT afterglow upper limits
  73. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  74. GRB050502b: Afterglow Confirmation
  75. GRB050502: P200 Observations (Correction)
  76. GRB050502: P200 Observations
  77. GRB 050504 : R band observation at Lulin observatory
  78. Swift UVOT observation of GRB 050504
  79. GRB 050504, R band Observations
  80. GRB 050502b, V band Observations
  81. GRB050504: P60 Observations
  82. GRB 050504: A long GRB detected with INTEGRAL
  83. GRB (?) 050504: IR Observations, Intriguing Source
  84. GRB 050502b, Optical observations
  85. GRB050502a: P60 Observations (Correction)
  86. GRB050502a: P60 Observations
  87. Renewal of SGR 1806-20 activity
  88. GRB050502B Swift-BAT refined analysis
  89. Swift UVOT refined analysis
  90. GRB 050502a : R band observation at Lulin observatory
  91. GRB 050502b : optical observation at Lulin observatory
  92. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  93. Swift Detection of the Bright Burst GRB050502b
  94. GRB 050502: INTEGRAL results
  95. GRB 050502: ROTSE-III Detection of Possible Counterpart
  96. Swift/BAT possible detection of a weak burst GRB050430
  97. GRB050416a: Radio Detection
  98. GRB 050422: Swift-UVOT observation
  99. GRB 050422: Swift-BAT refined analysis
  100. Swift Detection of GRB 050422

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