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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"

43599 results found.

  1. If the SN/GRB connection confirmed
  2. GRB 030329: Supernova Confirmed
  3. GRB030329: RTT150 optical observations
  4. GRB030329: HET spectroscopic monitoring
  5. GRB 030329, color evolution
  6. GRB030328, UBVRcIc field photometry
  7. GRB030329: Optical observcations
  8. GRB030329: BV photographic observations
  9. GRB 030329, color evolution
  10. GRB030329: RTT150 optical observations
  11. GRB 030329: Supernova Spectrum Emerging
  12. GRB030329: RTT150 optical observation
  13. GRB030329: More AAVSO VR obs
  14. GRB030328: R upper limit after 6 hours by MASTER
  15. GRB 030329: SARA Optical Observations
  16. GRB 030329: SARA Optical Observations
  17. GRB030329, fading resumes
  18. GRB 030329, BVRI photometry
  19. GRB030329: Optical observations
  20. SDSS 0.5m PT observations of GRB030329 (correction)
  21. SDSS 0.5m PT observations of GRB030329
  22. GRB 030329, Optical observations
  23. GRB 030329, nearby galaxies
  24. GRB030329, cessation of fading
  25. GRB030329: final R-band light curve by MASTER
  26. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  27. GRB 030329: Sub-millimeter detection
  28. GRB 030329: SARA Optical Observations
  29. GRB 030329: SARA Optical Observations
  30. OT GRB light curves and SN predictions
  31. GRB030329, optical observation
  32. GRB030329, optical observation
  33. GRB030329, new UBVRcIc field photometry
  34. GRB 030329, light curve and SN prediction
  35. GRB030329: optical observations at Tokyo Tech
  36. GRB 030329: optical observations
  37. GRB030329: multiple re-brightening phases
  38. GRB 030329, BRI photometry
  39. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  40. GRB 030329 , SPM optical observations
  41. GRB 030329: Radio observations at GMRT
  42. Further AAVSO V,B,R observations of GRB030329
  43. GRB 030329: Additional Mt. Laguna Optical Observations
  44. GRB 030329: SARA Optical Observations
  45. GRB 030329: Observations with ANDICAM
  46. GRB030329: Optical observations
  47. GRB030329: further optical photometry and evidence for a light curve discontinuity
  48. GRB 030329: Correction to GCN 2056
  49. GRB 030329: fitting parameters and re-brightening
  50. GRB030329 Further RBO Optical Observations
  51. triangulation of GRB 030331 (single error box)
  52. GRB030329 - OT rebrightens
  53. GRB 030329: SARA Optical Observations
  54. AAVSO V & R observations of GRB030329
  55. IPN triangulation of GRB030331 (annulus)
  56. GRB 030329: optical observations
  57. IPN triangulation of GRB030329b (large error box)
  58. GRB 030329: beginning of the new fading phase in optical band
  59. GRB 030329, optical spectroscopy
  60. GRB 030329: fading X-ray afterglow with RXTE
  61. GRB 030329: optical photometry
  62. GRB030329: Optical observations
  63. Photometry of GRB030329 - Constant OT Magnitude
  64. GRB 030329, R-band observations
  65. GRB 030329, R-band light curve
  66. GRB 030329: further optical observations
  67. GRB030329 - OT brightens
  68. GRB030329 15 GHz radio observation
  69. GRB 030329, optical photometry
  70. GRB030329: Near Infrared Observations
  71. 030331 NOT A GRB
  72. GRB 030324: Optical and NIR Observations
  73. GRB 030328, optical photometry
  74. GRB030329: R band light curve by MASTER
  75. GRB030329 - Light curve flattening
  76. GRB 030329: SARA Optical Observations
  77. GRB 030324, optical search
  78. GRB030329 - near contemporaneous optical limits from CONCAM
  79. GRB030329: R and B observations
  80. GRB030329: Optical observations
  81. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  82. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  83. GRB 030329: Light curve observed during the change of its slope.
  84. GRB030329, BVRcIc field photometry
  85. GRB030329, SPM optical observations
  86. GRB 030329: Optical Decay
  87. Redshift of GRB 030329
  88. GRB030329: ROTSE network observes steepening of decay curve
  89. GRB 030329, optical photometry
  90. GRB 030329: Optical decay and synthesis
  91. GRB030329 optical observations
  92. GRB030329: optical spectroscopy with the TNG
  93. GRB 030329: Radio Observations
  94. GRB 030329, optical spectroscopy
  95. GRB 030329: still bright
  96. GRB 030329: Optical pre-Imaging
  97. GRB 030329: visual observations
  98. GRB 030329: Upper limit from 5.6 hours before trigger
  99. GRB030328: R optical observation
  100. GRB030328: X-ray Afterglow Observed with Chandra

Advanced

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