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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: Correction to GCN 2056
  2. GRB 030329: fitting parameters and re-brightening
  3. GRB 030329: KAIT optical photometry
  4. GRB030329 Further RBO Optical Observations
  5. triangulation of GRB 030331 (single error box)
  6. GRB030329 - OT rebrightens
  7. GRB 030329: SARA Optical Observations
  8. AAVSO V & R observations of GRB030329
  9. IPN triangulation of GRB030331 (annulus)
  10. GRB 030329: optical observations
  11. IPN triangulation of GRB030329b (large error box)
  12. GRB 030329: beginning of the new fading phase in optical band
  13. GRB 030329, optical spectroscopy
  14. GRB 030329: fading X-ray afterglow with RXTE
  15. GRB 030329: optical photometry
  16. GRB030329: Optical observations
  17. Photometry of GRB030329 - Constant OT Magnitude
  18. GRB 030329, R-band observations
  19. GRB 030329, R-band light curve
  20. GRB 030329: further optical observations
  21. GRB030329 - OT brightens
  22. GRB 030329: OT observations at Kanazawa
  23. GRB030329 15 GHz radio observation
  24. GRB 030329 RBO V Optical Observations
  25. GRB 030329, optical photometry
  26. GRB030329: Near Infrared Observations
  27. 030331 NOT A GRB
  28. INTEGRAL GRB 030331
  29. GRB 030324: Optical and NIR Observations
  30. GRB 030328, optical photometry
  31. GRB030329: R band light curve by MASTER
  32. GRB030329 - Light curve flattening
  33. GRB 030329: SARA Optical Observations
  34. GRB 030324, optical search
  35. GRB030329 - near contemporaneous optical limits from CONCAM
  36. GRB030329: R and B observations
  37. GRB 030329, optical observations
  38. GRB030329: Optical observations
  39. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  40. GRB030329a: detection by Konus-Wind
  41. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  42. GRB 030329: Light curve observed during the change of its slope.
  43. GRB030329, BVRcIc field photometry
  44. GRB030329, SPM optical observations
  45. GRB 030329: Optical Decay
  46. Redshift of GRB 030329
  47. GRB030329: ROTSE network observes steepening of decay curve
  48. GRB 030329, optical photometry
  49. GRB 030329: Optical decay and synthesis
  50. GRB030329 optical observations
  51. GRB030329: optical spectroscopy with the TNG
  52. GRB 030329: Radio Observations
  53. GRB 030329, optical spectroscopy
  54. GRB 030329: still bright
  55. GRB 030329: Optical pre-Imaging
  56. GRB 030329: visual observations
  57. GRB 030329: Upper limit from 5.6 hours before trigger
  58. GRB030328: R optical observation
  59. GRB030328: X-ray Afterglow Observed with Chandra
  60. GRB 030323: Gemini South VRI obsevations.
  61. GRB030329: Optical observations
  62. GRB 030329, R-band observations, supplement
  63. GRB030329 optical observations
  64. GRB030329:optical observations by MASTER
  65. GRB 030329: optical observations
  66. GRB 030329, R-band observations
  67. GRB 030329: OT B and R photometry, decline rate
  68. GRB030329: Upper limits from recent and historical observations.
  69. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  70. RXTE detection of GRB 030329 afterglow
  71. GRB 030329: Optical Afterglow Observations
  72. GRB 030329: precise position from Kyoto images
  73. GRB 030328 Optical Observations
  74. GRB030328: Decay index
  75. GRB 030328: Optical observations
  76. GRB 030328: optical observations
  77. GRB 030329: Optical afterglow fading
  78. GRB 030329 follow-up
  79. GRB 030329: Optical afterglow candidate
  80. GRB 030329: OT candidate
  81. GRB 030329: Optical afterglow candidate
  82. GRB 030328: OT photometry
  83. GRB030328: optical spectroscopy at TNG
  84. GRB030328: optical photometry at the TNG
  85. VLT spectra of GRB 030328
  86. GRB 030328, optical spectroscopy
  87. GRB 030328, optical observations
  88. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  89. GRB 030328: Optical observations
  90. Re: GRB 030328: Finding chart
  91. GRB 030328: Finding chart
  92. GRB 030328: Optical afterglow candidate
  93. GRB030323 optical observations
  94. GRB030324 optical observation
  95. GRB030131, BVRcIc field photometry
  96. Possible GRB030323 localized by INTEGRAL
  97. IPN triangulation of GRB030325 (final analysis)
  98. GRB030323: Detection on 2003/03/24
  99. IPN triangulation of GRB030326 (single small error box)
  100. GRB 030323: SARA Optical Observations

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