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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. Further AAVSO V,B,R observations of GRB030329
  2. GRB 030329: Additional Mt. Laguna Optical Observations
  3. GRB 030329: SARA Optical Observations
  4. GRB 030329: Observations with ANDICAM
  5. GRB030329: Optical observations
  6. GRB030329: further optical photometry and evidence for a light curve discontinuity
  7. GRB 030329: Correction to GCN 2056
  8. GRB 030329: fitting parameters and re-brightening
  9. GRB 030329: KAIT optical photometry
  10. GRB030329 Further RBO Optical Observations
  11. triangulation of GRB 030331 (single error box)
  12. GRB030329 - OT rebrightens
  13. GRB 030329: SARA Optical Observations
  14. AAVSO V & R observations of GRB030329
  15. IPN triangulation of GRB030331 (annulus)
  16. GRB 030329: optical observations
  17. IPN triangulation of GRB030329b (large error box)
  18. GRB 030329: beginning of the new fading phase in optical band
  19. GRB 030329, optical spectroscopy
  20. GRB 030329: fading X-ray afterglow with RXTE
  21. GRB 030329: optical photometry
  22. GRB030329: Optical observations
  23. Photometry of GRB030329 - Constant OT Magnitude
  24. GRB 030329, R-band observations
  25. GRB 030329, R-band light curve
  26. GRB 030329: further optical observations
  27. GRB030329 - OT brightens
  28. GRB 030329: OT observations at Kanazawa
  29. GRB030329 15 GHz radio observation
  30. GRB 030329 RBO V Optical Observations
  31. GRB 030329, optical photometry
  32. GRB030329: Near Infrared Observations
  33. 030331 NOT A GRB
  34. INTEGRAL GRB 030331
  35. GRB 030324: Optical and NIR Observations
  36. GRB 030328, optical photometry
  37. GRB030329: R band light curve by MASTER
  38. GRB030329 - Light curve flattening
  39. GRB 030329: SARA Optical Observations
  40. GRB 030324, optical search
  41. GRB030329 - near contemporaneous optical limits from CONCAM
  42. GRB030329: R and B observations
  43. GRB 030329, optical observations
  44. GRB030329: Optical observations
  45. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  46. GRB030329a: detection by Konus-Wind
  47. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  48. GRB 030329: Light curve observed during the change of its slope.
  49. GRB030329, BVRcIc field photometry
  50. GRB030329, SPM optical observations
  51. GRB 030329: Optical Decay
  52. Redshift of GRB 030329
  53. GRB030329: ROTSE network observes steepening of decay curve
  54. GRB 030329, optical photometry
  55. GRB 030329: Optical decay and synthesis
  56. GRB030329 optical observations
  57. GRB030329: optical spectroscopy with the TNG
  58. GRB 030329: Radio Observations
  59. GRB 030329, optical spectroscopy
  60. GRB 030329: still bright
  61. GRB 030329: Optical pre-Imaging
  62. GRB 030329: visual observations
  63. GRB 030329: Upper limit from 5.6 hours before trigger
  64. GRB030328: R optical observation
  65. GRB030328: X-ray Afterglow Observed with Chandra
  66. GRB 030323: Gemini South VRI obsevations.
  67. GRB030329: Optical observations
  68. GRB 030329, R-band observations, supplement
  69. GRB030329 optical observations
  70. GRB030329:optical observations by MASTER
  71. GRB 030329: optical observations
  72. GRB 030329, R-band observations
  73. GRB 030329: OT B and R photometry, decline rate
  74. GRB030329: Upper limits from recent and historical observations.
  75. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  76. RXTE detection of GRB 030329 afterglow
  77. GRB 030329: Optical Afterglow Observations
  78. GRB 030329: precise position from Kyoto images
  79. GRB 030328 Optical Observations
  80. GRB030328: Decay index
  81. GRB 030328: Optical observations
  82. GRB 030328: optical observations
  83. GRB 030329: Optical afterglow fading
  84. GRB 030329 follow-up
  85. GRB 030329: Optical afterglow candidate
  86. GRB 030329: OT candidate
  87. GRB 030329: Optical afterglow candidate
  88. GRB 030328: OT photometry
  89. GRB030328: optical spectroscopy at TNG
  90. GRB030328: optical photometry at the TNG
  91. VLT spectra of GRB 030328
  92. GRB 030328, optical spectroscopy
  93. GRB 030328, optical observations
  94. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  95. GRB 030328: Optical observations
  96. Re: GRB 030328: Finding chart
  97. GRB 030328: Finding chart
  98. GRB 030328: Optical afterglow candidate
  99. GRB030323 optical observations
  100. GRB030324 optical observation

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