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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"

20514 results found.

  1. GRB030329: BV photographic observations
  2. GRB 030329 Optical observations
  3. GRB030329: RTT150 optical observations
  4. GRB030329: Kiso B and R band observations
  5. GRB030329: RTT150 optical observation
  6. GRB030329: More AAVSO VR obs
  7. GRB030328: R upper limit after 6 hours by MASTER
  8. GRB 030329: BV photographic observations
  9. GRB 030329: SARA Optical Observations
  10. GRB 030329: SARA Optical Observations
  11. GRB030329: Optical observations
  12. SDSS 0.5m PT observations of GRB030329 (correction)
  13. SDSS 0.5m PT observations of GRB030329
  14. GRB 030329, Optical observations
  15. GRB 030329, nearby galaxies
  16. GRB030329: final R-band light curve by MASTER
  17. GRB030329 - more 15 GHz radio data
  18. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  19. GRB 030329: Sub-millimeter detection
  20. GRB 030329: SARA Optical Observations
  21. GRB 030329: SARA Optical Observations
  22. GRB030329: optical observations at Tokyo Tech
  23. GRB 030329: optical observations
  24. GRB 030329, BRI photometry
  25. GRB 030329 , SPM optical observations
  26. GRB030329: Optical observations at Teramo
  27. GRB 030329: Radio observations at GMRT
  28. GRB030329: more 15GHz observations
  29. Further AAVSO V,B,R observations of GRB030329
  30. GRB 030329: Additional Mt. Laguna Optical Observations
  31. GRB 030329: SARA Optical Observations
  32. GRB 030329: Observations with ANDICAM
  33. GRB030329: Optical observations
  34. GRB030329: further optical photometry and evidence for a light curve discontinuity
  35. GRB 030329: Correction to GCN 2056
  36. GRB 030329: KAIT optical photometry
  37. GRB030329 Further RBO Optical Observations
  38. GRB 030329: SARA Optical Observations
  39. AAVSO V & R observations of GRB030329
  40. GRB 030329: optical observations
  41. GRB 030329: beginning of the new fading phase in optical band
  42. GRB 030329: optical photometry
  43. GRB030329: Optical observations
  44. Photometry of GRB030329 - Constant OT Magnitude
  45. GRB 030329, R-band observations
  46. GRB 030329: further optical observations
  47. GRB030329 - OT brightens
  48. GRB 030329: OT observations at Kanazawa
  49. GRB 030329 RBO V Optical Observations
  50. GRB 030329, optical photometry
  51. GRB030329: Near Infrared Observations
  52. GRB 030324: Optical and NIR Observations
  53. GRB 030328, optical photometry
  54. GRB030329: R band light curve by MASTER
  55. GRB030329 - Light curve flattening
  56. GRB 030329: SARA Optical Observations
  57. GRB 030324, optical search
  58. GRB030329: R and B observations
  59. GRB 030329, optical observations
  60. GRB030329: Optical observations
  61. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  62. GRB 030329: Light curve observed during the change of its slope.
  63. GRB030329, SPM optical observations
  64. GRB030329: ROTSE network observes steepening of decay curve
  65. GRB 030329: Optical decay and synthesis
  66. GRB030329 optical observations
  67. GRB030329: optical spectroscopy with the TNG
  68. GRB 030329: Radio Observations
  69. GRB 030329, optical spectroscopy
  70. GRB 030329: still bright
  71. GRB 030329: visual observations
  72. GRB 030329: Upper limit from 5.6 hours before trigger
  73. GRB030328: X-ray Afterglow Observed with Chandra
  74. GRB030329: Optical observations
  75. GRB 030329, R-band observations, supplement
  76. GRB030329 optical observations
  77. GRB030329:optical observations by MASTER
  78. GRB 030329: optical observations
  79. GRB 030329, R-band observations
  80. GRB030329: Upper limits from recent and historical observations.
  81. GRB 030329: Optical Afterglow Observations
  82. GRB 030328 Optical Observations
  83. GRB030328: Decay index
  84. GRB 030328: Optical observations
  85. GRB 030328: optical observations
  86. GRB 030329: Optical afterglow fading
  87. GRB 030329 follow-up
  88. GRB 030329: Optical afterglow candidate
  89. GRB 030328: OT photometry
  90. GRB030328: optical spectroscopy at TNG
  91. GRB030328: optical photometry at the TNG
  92. GRB 030328, optical spectroscopy
  93. GRB 030328, optical observations
  94. GRB 030328: Optical observations
  95. GRB 030328: Optical afterglow candidate
  96. GRB030323 optical observations
  97. GRB 030323: SARA Optical Observations
  98. GRB030324, optical observations
  99. GRB030324, optical observations
  100. GRB 030324: TAROT optical observations

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