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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').

18174 results found.

  1. GRB 050525A: Swift Late-Time Decay Rate
  2. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  3. GRB 050416(a): Host Galaxy Redshift Determination
  4. Swift/UVOT observations of GRB050607
  5. GRB 050607: RAPTOR-S Early Optical Limits
  6. GRB050607: KAIT optical limits
  7. GRB 050607: MDM Observations
  8. GRB050607,optical observation
  9. GRB 050607 - XRT refined data analysis
  10. GRB050607 optical limit by "Pi of the Sky"
  11. GRB050607: Swift Detection of a long GRB
  12. GRB 050603 - XRT data analysis of the first day
  13. Konus-Wind observation of GRB 050603
  14. GRB 050603: Analysis of UVOT data
  15. GRB050603: Fading Afterglow observed by Swift UVOT
  16. GRB 050603: Swift XRT Position
  17. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  18. Swift/BAT Detection of GRB050603
  19. GRB 050408: jet break in the XRT light curve
  20. GRB050528, XRT observations
  21. Correction to GCN Circ 3502 on GRB 050528
  22. Swift-BAT GRB 050528: a soft burst
  23. Update on Swift-BAT GRB 050528 (Trigger 130679)
  24. Possible GRB050528: no candidate from Liverpool Telescope
  25. Swift-BAT detection of possible GRB 050528
  26. GRB 050509b: refined XRT/Chandra afterglow position analysis
  27. GRB050525a: optical upper limits
  28. GRB 050525B: Swift-BAT observations
  29. GRB050525A,optical observation
  30. GRB050525: Super-LOTIS observations
  31. GRB 050525, spectral lag pseudo-redshift
  32. GRB050306: optical afterglow not confirmed
  33. GRB 050525A: BOOTES simultaneous optical observations
  34. GRB 050525A: Swift-BAT refined analysis
  35. Swift/UVOT UV and optical detections of GRB 050525
  36. Konus-Wind observation of GRB 050525
  37. GRB 050525: TAROT observations of the early afterglow
  38. INTEGRAL detection of GRB 050525
  39. GRB 050525: Optical observation
  40. GRB050525: ROTSE-III Refined Analysis
  41. GRB 050525 - Very Bright, Not Short
  42. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  43. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  44. XRF 050522: Swift XRT refined analysis
  45. Swift/UVOT observation of XRF 050522
  46. GRB 050509A: Further I-band imaging
  47. RBO Observations of GRB050522
  48. XRF 050522: Swift XRT observation
  49. GRB 050520: VLT/ULTRACAM observations
  50. Swift UVOT Observations of GRB 050520
  51. GRB 050520: Swift XRT refined analysis
  52. XRF050509C: Chandra Afterglow Detection
  53. XRF 050509c: Swift XRT Upper Limit
  54. RBO Observations of GRB050520
  55. GRB 050520: TAROT optical limit
  56. GRB 050520: Swift XRT position
  57. No Swift-BAT Lightcurves in real-time for next 3 weeks
  58. Swift-BAT trigger 122203 is not a real GRB
  59. GRB 050504: Swift XRT afterglow candidate has faded
  60. GRB 050509B: Subaru Optical Observations
  61. GRB050502b: Early Observation
  62. Refined Chandra analysis of GRB 050509b
  63. GRB050509b, SDSS pre-burst observations
  64. Chandra observation of GRB 050509b
  65. GRB 050509b: RAPTOR deep, early limits.
  66. GRB050509B: Optical/Infared observations
  67. GRB 050509b: Swift/UVOT follow-up measurements
  68. GRB 050509b Milagro GeV/TeV Observations
  69. GRB050509B: Optical observations at the Very Large Telescope
  70. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  71. GRB 050509a: Swift-BAT refined analysis
  72. GRB 050509B: WSRT Radio Observations
  73. GRB 050505: SARA Observations
  74. Swift UVOT Follow-up Observations of GRB 050509B
  75. GRB 050509B, Optical Observations
  76. GRB 050509B: Swift/XRT refined analysis
  77. GRB050509a: Swift UVOT observations
  78. GRB 050509b: Optical observations
  79. GRB 050509b: Possible Optical Counterpart
  80. GRB 050509A: Optical observations
  81. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  82. GRB 050509b: optical observations
  83. GRB 050509b: Swift XRT Position
  84. GRB 050509B: ROTSE-III Optical Limits
  85. Swift Detection of GRB050509b: A short duration burst
  86. GRB 050509a: Swift XRT Position
  87. Swift Detection of the Burst GRB050509
  88. Swift-BAT detection of GRB 050507
  89. GRB 050505: early time observations
  90. GRB 050505 - Faulkes Telescope North observations
  91. GRB 050502a: Swift XRT Upper Limit
  92. GRB 050505, simultaneous optical observation
  93. GRB 050505: Further Swift UVOT observations.
  94. GRB050416A : 1 GHz limit from GMRT
  95. GRB 050505 UVOT
  96. GRB 050505: Swift XRT Position
  97. GRB050505 Swift-BAT refined analysis
  98. GRB 050416b:Swift XRT afterglow upper limits
  99. GRB 050416b:Swift XRT afterglow upper limits
  100. Swift-BAT detection of GRB050505

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