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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"

41622 results found.

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

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