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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"

20558 results found.

  1. GRB 030329, Optical observations
  2. GRB 030329, nearby galaxies
  3. GRB030329: final R-band light curve by MASTER
  4. GRB030329 - more 15 GHz radio data
  5. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  6. GRB 030329: Sub-millimeter detection
  7. GRB 030329: SARA Optical Observations
  8. GRB 030329: SARA Optical Observations
  9. GRB 030329, light curve and SN prediction
  10. GRB030329: optical observations at Tokyo Tech
  11. GRB 030329: optical observations
  12. GRB 030329, BRI photometry
  13. GRB 030329 , SPM optical observations
  14. GRB030329: Optical observations at Teramo
  15. GRB 030329: Radio observations at GMRT
  16. GRB030329: more 15GHz observations
  17. Further AAVSO V,B,R observations of GRB030329
  18. GRB 030329: Additional Mt. Laguna Optical Observations
  19. GRB 030329: SARA Optical Observations
  20. GRB 030329: Observations with ANDICAM
  21. GRB030329: Optical observations
  22. GRB030329: further optical photometry and evidence for a light curve discontinuity
  23. GRB 030329: Correction to GCN 2056
  24. GRB 030329: KAIT optical photometry
  25. GRB030329 Further RBO Optical Observations
  26. GRB 030329: SARA Optical Observations
  27. AAVSO V & R observations of GRB030329
  28. GRB 030329: optical observations
  29. GRB 030329: beginning of the new fading phase in optical band
  30. GRB 030329, optical spectroscopy
  31. GRB 030329: optical photometry
  32. GRB030329: Optical observations
  33. Photometry of GRB030329 - Constant OT Magnitude
  34. GRB 030329, R-band observations
  35. GRB 030329, R-band light curve
  36. GRB 030329: further optical observations
  37. GRB030329 - OT brightens
  38. GRB 030329: OT observations at Kanazawa
  39. GRB 030329 RBO V Optical Observations
  40. GRB 030329, optical photometry
  41. GRB030329: Near Infrared Observations
  42. GRB 030324: Optical and NIR Observations
  43. GRB030329: R band light curve by MASTER
  44. GRB030329 - Light curve flattening
  45. GRB 030329: SARA Optical Observations
  46. GRB030329: R and B observations
  47. GRB 030329, optical observations
  48. GRB030329: Optical observations
  49. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  50. GRB 030329: Light curve observed during the change of its slope.
  51. GRB030329, SPM optical observations
  52. GRB030329: ROTSE network observes steepening of decay curve
  53. GRB 030329: Optical decay and synthesis
  54. GRB030329 optical observations
  55. GRB030329: optical spectroscopy with the TNG
  56. GRB 030329: Radio Observations
  57. GRB 030329, optical spectroscopy
  58. GRB 030329: Optical pre-Imaging
  59. GRB 030329: visual observations
  60. GRB 030329: Upper limit from 5.6 hours before trigger
  61. GRB030328: X-ray Afterglow Observed with Chandra
  62. GRB030329: Optical observations
  63. GRB 030329, R-band observations, supplement
  64. GRB030329 optical observations
  65. GRB030329:optical observations by MASTER
  66. GRB 030329: optical observations
  67. GRB 030329, R-band observations
  68. GRB030329: Upper limits from recent and historical observations.
  69. GRB 030329: Optical Afterglow Observations
  70. GRB 030329: precise position from Kyoto images
  71. GRB 030328 Optical Observations
  72. GRB030328: Decay index
  73. GRB 030328: Optical observations
  74. GRB 030328: optical observations
  75. GRB 030329: Optical afterglow fading
  76. GRB 030329 follow-up
  77. GRB 030329: Optical afterglow candidate
  78. GRB 030328: OT photometry
  79. GRB030328: optical spectroscopy at TNG
  80. GRB030328: optical photometry at the TNG
  81. GRB 030328, optical observations
  82. GRB 030328: Optical observations
  83. GRB 030328: Optical afterglow candidate
  84. GRB030323 optical observations
  85. GRB 030323: SARA Optical Observations
  86. GRB030324, optical observations
  87. GRB030324, optical observations
  88. GRB 030324: TAROT optical observations
  89. GRB030323: V, R, I photometry
  90. GRB 030324 (HETE #2641): Optical observations
  91. GRB030324, Optical Observations
  92. GRB030323: Upper limits from recent and historical observations.
  93. VLT/FORS2 spectra of GRB 030323
  94. GRB030323, optical observations
  95. GRB030324, BVRcIc field photometry
  96. GRB030323, possible optical counterpart
  97. GRB030323, BVRcIc field calibration
  98. GRB 030324 optical observations
  99. GRB 030320: Optical Observations
  100. GRB 030324, optical observations

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