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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').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

41699 results found.

  1. GRB 030329 VLBA Observations
  2. GRB 030329: BVRI photometry at Asiago
  3. GRB 030329, light curve flattens
  4. GRB 030329: VLT V-band photometry
  5. If the SN/GRB connection confirmed
  6. GRB 030329: Supernova Confirmed
  7. GRB030329: RTT150 optical observations
  8. GRB030329: Near Infrared Observations at Gunma
  9. GRB030329: HET spectroscopic monitoring
  10. Kiso observation of the GRB030329 at April 6
  11. GRB 030329, color evolution
  12. GRB030328, UBVRcIc field photometry
  13. GRB030329: Optical observcations
  14. GRB030329: BV photographic observations
  15. GRB 030329 Optical observations
  16. GRB 030329, color evolution
  17. GRB 030329: possible color change
  18. GRB030329: RTT150 optical observations
  19. GRB 030329: Supernova Spectrum Emerging
  20. GRB030329: Kiso B and R band observations
  21. GRB030329: RTT150 optical observation
  22. GRB030329: More AAVSO VR obs
  23. GRB030328: R upper limit after 6 hours by MASTER
  24. GRB 030329: BV photographic observations
  25. GRB 030329: SARA Optical Observations
  26. GRB 030329: SARA Optical Observations
  27. GRB030329, fading resumes
  28. GRB 030329, BVRI photometry
  29. GRB030329: Optical observations
  30. SDSS 0.5m PT observations of GRB030329 (correction)
  31. SDSS 0.5m PT observations of GRB030329
  32. GRB 030329, Optical observations
  33. GRB 030329, nearby galaxies
  34. GRB030329, cessation of fading
  35. GRB030329: final R-band light curve by MASTER
  36. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  37. GRB 030329: Sub-millimeter detection
  38. GRB 030329: SARA Optical Observations
  39. GRB 030329: SARA Optical Observations
  40. OT GRB light curves and SN predictions
  41. GRB030329, optical observation
  42. GRB030329, optical observation
  43. GRB030329, new UBVRcIc field photometry
  44. GRB 030329, light curve and SN prediction
  45. GRB030329: optical observations at Tokyo Tech
  46. GRB 030329: optical observations
  47. GRB030329: multiple re-brightening phases
  48. GRB 030329, BRI photometry
  49. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  50. GRB 030329 , SPM optical observations
  51. GRB030329: Optical observations at Teramo
  52. GRB 030329: Radio observations at GMRT
  53. GRB030329: more 15GHz observations
  54. Further AAVSO V,B,R observations of GRB030329
  55. GRB 030329: Additional Mt. Laguna Optical Observations
  56. GRB 030329: SARA Optical Observations
  57. GRB 030329: Observations with ANDICAM
  58. GRB030329: Optical observations
  59. GRB030329: further optical photometry and evidence for a light curve discontinuity
  60. GRB 030329: Correction to GCN 2056
  61. GRB 030329: fitting parameters and re-brightening
  62. GRB 030329: KAIT optical photometry
  63. GRB030329 Further RBO Optical Observations
  64. triangulation of GRB 030331 (single error box)
  65. GRB030329 - OT rebrightens
  66. GRB 030329: SARA Optical Observations
  67. AAVSO V & R observations of GRB030329
  68. GRB 030329: optical observations
  69. IPN triangulation of GRB030329b (large error box)
  70. GRB 030329: beginning of the new fading phase in optical band
  71. GRB 030329, optical spectroscopy
  72. GRB 030329: fading X-ray afterglow with RXTE
  73. GRB 030329: optical photometry
  74. GRB030329: Optical observations
  75. Photometry of GRB030329 - Constant OT Magnitude
  76. GRB 030329, R-band light curve
  77. GRB 030329: further optical observations
  78. GRB030329 - OT brightens
  79. GRB 030329: OT observations at Kanazawa
  80. GRB030329 15 GHz radio observation
  81. GRB 030329 RBO V Optical Observations
  82. GRB 030329, optical photometry
  83. GRB030329: Near Infrared Observations
  84. GRB 030324: Optical and NIR Observations
  85. GRB 030328, optical photometry
  86. GRB030329: R band light curve by MASTER
  87. GRB030329 - Light curve flattening
  88. GRB 030329: SARA Optical Observations
  89. GRB 030324, optical search
  90. GRB030329 - near contemporaneous optical limits from CONCAM
  91. GRB030329: R and B observations
  92. GRB 030329, optical observations
  93. GRB030329: Optical observations
  94. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  95. GRB030329a: detection by Konus-Wind
  96. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  97. GRB 030329: Light curve observed during the change of its slope.
  98. GRB030329, BVRcIc field photometry
  99. GRB030329, SPM optical observations
  100. GRB 030329: Optical Decay

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