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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').

10639 results found.

  1. GRB061019: optical observations
  2. GRB 061019: SARA upper limit
  3. GRB 060930: MARGE Optical Limits
  4. GRB 061019, Swift-BAT refined analysis
  5. GRB 061019: Swift-BAT detection of a burst
  6. GRB 061007: RHESSI Spectral Fit
  7. Konus-Wind observation of GRB 061007
  8. Konus-Wind observation of the short hard GRB 061006
  9. Konus-Wind observation of GRB 060928
  10. GRB 060928: RHESSI Spectral Fit
  11. GRB 060930: near-IR afterglow candidate
  12. GRB 061002, Swift-BAT refined analysis
  13. GRB061002: MASTER-VWF-Kislovodsk observations
  14. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  15. GRB 061002: Swift detection of a burst
  16. GRB 060807: Detection of a possible host galaxy
  17. GRB060930: Faulkes Telescope South observation
  18. GRB 060930: ROTSE-III Optical Limits
  19. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  20. GRB 060929: BART observation
  21. GRB 060929: MASTER-VWF-Kislovodsk observations
  22. GRB 060929: BOOTES-IR & OSN observations
  23. Liverpool Telescope observations of GRB 060929
  24. GRB060908: optical observations
  25. GRB 060927 optical limit
  26. GRB 060927 : Kiso optical observation
  27. GRB 060927: Swift detection of a burst
  28. GRB060923C: AROMA optical obsevation
  29. GRB 060923, Swift-BAT refined analysis
  30. Swift detection of IGR J17497-2821 (trigger 230504)
  31. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  32. GRB 060919: Swift detection of a burst
  33. Konus-Wind observation of GRB 060912
  34. GRB060912: Swift/UVOT Observations
  35. GRB 060912B: a long GRB detected with INTEGRAL
  36. GRB 060912: Swift XRT Team Refined Analysis
  37. GRB 060912: Swift detection of a burst with an optical afterglow
  38. GRB 060908, Swift/XRT refined analysis
  39. GRB 060908: Swift/UVOT Observations
  40. GRB 060904A : Optical limit
  41. GRB 060908: REM optical prompt observation
  42. GRB 060908: PROMPT Detection of a Bright Counterpart
  43. GRB 060908: Swift detection of a burst with a bright optical counterpart
  44. GRB 060906: optical observation
  45. GRB 060906: observations with FRAM
  46. GRB 060906: Swift detection of a probable burst
  47. GRB 060904B: RTT150 optical observations
  48. Konus-Wind observation of GRB 060904A
  49. Konus-Wind observation of GRB 060901
  50. GRB 060901: further INTEGRAL results
  51. GRB 060901: Watcher observations
  52. GRB 060901: a long GRB detected by INTEGRAL
  53. Two bright bursts from SGR 1806-20 detected with IBAS
  54. GRB 060605: VLA Observation
  55. GRB 060707: VLA observation
  56. GRB 060826(?): Swift detection of a possible burst
  57. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  58. GRB 060813: A long, bright GRB detected with Suzaku WAM
  59. Konus-Wind observation of GRB 060814
  60. GRB 060814: source inside revised XRT error box
  61. GRB 060814: Possible IR counterpart
  62. GRB 060814: Swift XRT refined analysis
  63. GRB 060814 - SDSS Pre-Burst Observations
  64. Konus-Wind observation of GRB 060813
  65. Image of the dust-scattering halo around SGR 1806-20
  66. Second VLA limit on new radio point source in SGR 1806-20
  67. A dust-scattering halo detected around SGR 1806-20
  68. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  69. GRB060807: Optical limiting magnitudes
  70. VLA Upper Limit on Outburst of SGR 1806-20
  71. GRB060806 is similar to previous activity of SGR1806-20
  72. GRB060806 = SGR1806-20
  73. GRB 060805B: RHESSI Spectral Fit
  74. GRB060807: optical upper limit in white light
  75. IPN triangulation of GRB060806 (long, exceptionally bright)
  76. IPN triangulation of GRB060805B
  77. GRB 060805: KAIT observations
  78. GRB060801: optical upper limit in R
  79. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  80. GRB 060729: Refined analysis of the Swift-BAT burst
  81. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  82. GRB 060719: optical limit by Pi-of-the-Sky
  83. GRB 060719: LCO optical observations
  84. GRB 060714: Refined analysis of the Swift-BAT burst
  85. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  86. GRB 060605: SkyNet Optical Limits
  87. GRB 060707: BOOTES-IR optical observation
  88. GRB 060707: Swift detection of a burst
  89. Konus-Wind observation of GRB 060614
  90. GRB060614: SSO 1m observations
  91. GRB060614: Watcher observation
  92. BAT Trigger #214277 is SGR 1900+14
  93. GRB 060610: KAIT observations
  94. GRB 060607: Swift detection of a burst with bright optical counterpart
  95. GRB 060522: PROMPT Optical Limits
  96. GRB 060605: RTT150 optical observations
  97. GRB 060605: Swift detection of a burst with optical counterpart
  98. GRB060604: Swift/UVOT detections
  99. GRB 060604A: ROTSE-III Optical Limits
  100. GRB 060604: Swift detection of a burst with possible optical counterpart

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