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

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