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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').
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"

11503 results found.

  1. GRB 050813: KAIT optical limit
  2. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  3. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  4. Detection of an intermediate burst from SGR 1806-20 on August 8
  5. GRB 050807: ROTSE-III Optical Limits
  6. GRB050803, optical observations
  7. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  8. GRB 050803: RTT150 optical observations
  9. GRB050803: CrAO optical observations, possible OT candidate
  10. GRB 050803: Swift-BAT refined analysis
  11. GRB050803: MASTER further analys
  12. GRB 050803: early Swift XRT analysis results
  13. GCN GRB observation 050713A
  14. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  15. GRB050802: CrAO optical observations
  16. GRB 050802: Swift Gamma-ray Burst
  17. GRB 050801: Swift-BAT refined analysis
  18. GRB 050730, corrected photometry and break?
  19. GRB050730: Refined BAT analysis of the Swift-BAT burst
  20. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  21. GRB050730: Liverpool Telescope optical observations
  22. GRB 050730, optical candidate
  23. GRB050730: Swift-BAT detection of a weak burst
  24. GRB050713b: Maidanak optical observations
  25. GRB 050724: Chandra Observations of the X-ray Afterglow
  26. GRB 050724, SMARTS optical/IR afterglow observations
  27. GRB 050726, SMARTS optical/IR observations
  28. GRB 050724: J-band observations
  29. GRB 050724: SWIFT XRT refined position
  30. GRB050721A: Swift-BAT detection of a weak burst
  31. GRB 050712, Tautenburg optical afterglow observations
  32. Konus-Wind observation of GRB 050717
  33. Swift detection of GRB 050717
  34. Konus-Wind observation of GRB 050713A
  35. GRB 050714, R-band candidate
  36. GRB 050714A: ROTSE-III Optical Limits
  37. GRB 050714 - A long GRB detected with INTEGRAL
  38. GRB 050712, optical observations
  39. GRB050709: Candidate X-ray Afterglow from Chandra
  40. GRB 050713: Swift detection of Bright Burst
  41. GRB 050713A: ROTSE-III Optical Limits
  42. GRB050709: Radio Observations
  43. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  44. GRB 050626 optical observations
  45. GRB 050626: Swift XRT observations
  46. GRB 050408: ARC 3.5-meter NIR Observations
  47. GRB050701: Swift-BAT Refined analysis
  48. GRB 050626 - a long GRB detected with INTEGRAL
  49. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  50. Konus-Wind observation of an intermediate burst from SGR 1806-20
  51. GRB 050607: Optical decay and spectral slope
  52. Optical Afterglow of GRB 050607
  53. Konus-Wind observation of GRB 050603
  54. GRB050528: updated Liverpool Telescope limits
  55. GRB 050525: RTT150, Optical observations
  56. GRB 050525: MITSuME Optical Observation in VRI
  57. GRB050525: Super-LOTIS observations
  58. GRB 050525A: Swift-BAT refined analysis
  59. GRB050525: Optical observations
  60. Konus-Wind observation of GRB 050525
  61. INTEGRAL detection of GRB 050525
  62. GRB 050525, infrared observations
  63. GRB 050525: Optical observation
  64. GRB050525: ROTSE-III Refined Analysis
  65. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  66. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  67. XRF050522: NIR observations of XRT candidate
  68. XRF 050522: Swift XRT refined analysis
  69. GRB 050509A: Further I-band imaging
  70. GRB050522,optical observation
  71. GRB050520,optical observation
  72. GRB050509b: optical observations
  73. XRF 050522: Swift XRT observation
  74. XRF050522: Optical Observations
  75. XRF 050522 detected with INTEGRAL
  76. GRB 050520: Swift XRT refined analysis
  77. XRF050509C: Chandra Afterglow Detection
  78. XRF 050509c: Swift XRT Upper Limit
  79. GRB050520: Liverpool Telescope follow-up
  80. GRB 050520 - A long GRB detected with INTEGRAL
  81. Swift-BAT trigger 122203 is not a real GRB
  82. GRB 050509B and short GRB-SN association? (corrected)
  83. GRB 050509B and short GRB-SN association?
  84. GRB050509b, Bok telescope B-band imaging
  85. Chandra observation of GRB 050509b
  86. GRB 050509b: RAPTOR deep, early limits.
  87. GRB 050509a: Swift-BAT refined analysis
  88. GRB 050509c: ROTSE-III Optical Limits
  89. GRB 050509A: Optical observations
  90. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  91. GRB 050509B: ROTSE-III Optical Limits
  92. GRB 050509a: Swift XRT Position
  93. Swift-BAT detection of GRB 050507
  94. GRB 050502a: Swift XRT Upper Limit
  95. GRB050416A : 1 GHz limit from GMRT
  96. GRB050505 Swift-BAT refined analysis
  97. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  98. GRB050502b: Afterglow Confirmation
  99. GRB 050504, R band Observations
  100. GRB 050504: A long GRB detected with INTEGRAL

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