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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').
  1. GRB 030329 Optical observations
  2. GRB 030329, color evolution
  3. GRB 030329: possible color change
  4. GRB030329: RTT150 optical observations
  5. GRB 030329: Supernova Spectrum Emerging
  6. GRB030329: Kiso B and R band observations
  7. GRB030329: RTT150 optical observation
  8. GRB030329: More AAVSO VR obs
  9. GRB030328: R upper limit after 6 hours by MASTER
  10. GRB 030329: BV photographic observations
  11. GRB 030329: SARA Optical Observations
  12. GRB 030329: SARA Optical Observations
  13. GRB030329, fading resumes
  14. GRB 030329, BVRI photometry
  15. GRB030329: Optical observations
  16. SDSS 0.5m PT observations of GRB030329 (correction)
  17. SDSS 0.5m PT observations of GRB030329
  18. GRB 030329, Optical observations
  19. GRB 030329, nearby galaxies
  20. GRB030329, cessation of fading
  21. GRB030329: final R-band light curve by MASTER
  22. GRB030329 - more 15 GHz radio data
  23. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  24. GRB 030329: Sub-millimeter detection
  25. GRB 030329: SARA Optical Observations
  26. GRB 030329: SARA Optical Observations
  27. OT GRB light curves and SN predictions
  28. GRB030329, optical observation
  29. GRB030329, optical observation
  30. GRB030329, new UBVRcIc field photometry
  31. GRB 030329, light curve and SN prediction
  32. GRB030329: optical observations at Tokyo Tech
  33. GRB 030329: optical observations
  34. GRB030329: multiple re-brightening phases
  35. GRB 030329, BRI photometry
  36. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  37. GRB 030329 , SPM optical observations
  38. GRB030329: Optical observations at Teramo
  39. GRB 030329: Radio observations at GMRT
  40. GRB030329: more 15GHz observations
  41. Further AAVSO V,B,R observations of GRB030329
  42. GRB 030329: Additional Mt. Laguna Optical Observations
  43. GRB 030329: SARA Optical Observations
  44. GRB 030329: Observations with ANDICAM
  45. GRB030329: Optical observations
  46. GRB030329: further optical photometry and evidence for a light curve discontinuity
  47. GRB 030329: Correction to GCN 2056
  48. GRB 030329: fitting parameters and re-brightening
  49. GRB 030329: KAIT optical photometry
  50. GRB030329 Further RBO Optical Observations
  51. triangulation of GRB 030331 (single error box)
  52. GRB030329 - OT rebrightens
  53. GRB 030329: SARA Optical Observations
  54. AAVSO V & R observations of GRB030329
  55. IPN triangulation of GRB030331 (annulus)
  56. GRB 030329: optical observations
  57. IPN triangulation of GRB030329b (large error box)
  58. GRB 030329: beginning of the new fading phase in optical band
  59. GRB 030329, optical spectroscopy
  60. GRB 030329: fading X-ray afterglow with RXTE
  61. GRB 030329: optical photometry
  62. GRB030329: Optical observations
  63. Photometry of GRB030329 - Constant OT Magnitude
  64. GRB 030329, R-band observations
  65. GRB 030329, R-band light curve
  66. GRB 030329: further optical observations
  67. GRB030329 - OT brightens
  68. GRB 030329: OT observations at Kanazawa
  69. GRB030329 15 GHz radio observation
  70. GRB 030329 RBO V Optical Observations
  71. GRB 030329, optical photometry
  72. GRB030329: Near Infrared Observations
  73. 030331 NOT A GRB
  74. INTEGRAL GRB 030331
  75. GRB 030324: Optical and NIR Observations
  76. GRB 030328, optical photometry
  77. GRB030329: R band light curve by MASTER
  78. GRB030329 - Light curve flattening
  79. GRB 030329: SARA Optical Observations
  80. GRB 030324, optical search
  81. GRB030329 - near contemporaneous optical limits from CONCAM
  82. GRB030329: R and B observations
  83. GRB 030329, optical observations
  84. GRB030329: Optical observations
  85. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  86. GRB030329a: detection by Konus-Wind
  87. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  88. GRB 030329: Light curve observed during the change of its slope.
  89. GRB030329, BVRcIc field photometry
  90. GRB030329, SPM optical observations
  91. GRB 030329: Optical Decay
  92. Redshift of GRB 030329
  93. GRB030329: ROTSE network observes steepening of decay curve
  94. GRB 030329, optical photometry
  95. GRB 030329: Optical decay and synthesis
  96. GRB030329 optical observations
  97. GRB030329: optical spectroscopy with the TNG
  98. GRB 030329: Radio Observations
  99. GRB 030329, optical spectroscopy
  100. GRB 030329: still bright

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