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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"

44624 results found.

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

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