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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"

21784 results found.

  1. GRB030329: VR Photometry at TNG
  2. GRB030324: Candidate Optical Afterglow
  3. GRB 030413: Optical Observations
  4. GRB 030329 Rc observations
  5. GRB 030329 VLBA Observations
  6. GRB 030329: VLT V-band photometry
  7. GRB030329: RTT150 optical observations
  8. GRB030329: Near Infrared Observations at Gunma
  9. GRB030329: HET spectroscopic monitoring
  10. Kiso observation of the GRB030329 at April 6
  11. GRB030329: Optical observcations
  12. GRB030329: BV photographic observations
  13. GRB 030329 Optical observations
  14. GRB 030329, color evolution
  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: Optical observations
  25. SDSS 0.5m PT observations of GRB030329 (correction)
  26. SDSS 0.5m PT observations of GRB030329
  27. GRB 030329, Optical observations
  28. GRB 030329, nearby galaxies
  29. GRB030329: final R-band light curve by MASTER
  30. GRB030329 - more 15 GHz radio data
  31. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  32. GRB 030329: Sub-millimeter detection
  33. GRB 030329: SARA Optical Observations
  34. GRB 030329: SARA Optical Observations
  35. GRB 030329, light curve and SN prediction
  36. GRB030329: optical observations at Tokyo Tech
  37. GRB 030329: optical observations
  38. GRB 030329, BRI photometry
  39. GRB 030329 , SPM optical observations
  40. GRB030329: Optical observations at Teramo
  41. GRB 030329: Radio observations at GMRT
  42. GRB030329: more 15GHz observations
  43. Further AAVSO V,B,R observations of GRB030329
  44. GRB 030329: Additional Mt. Laguna Optical Observations
  45. GRB 030329: SARA Optical Observations
  46. GRB 030329: Observations with ANDICAM
  47. GRB030329: Optical observations
  48. GRB030329: further optical photometry and evidence for a light curve discontinuity
  49. GRB 030329: Correction to GCN 2056
  50. GRB 030329: KAIT optical photometry
  51. GRB030329 Further RBO Optical Observations
  52. GRB 030329: SARA Optical Observations
  53. AAVSO V & R observations of GRB030329
  54. GRB 030329: optical observations
  55. GRB 030329: beginning of the new fading phase in optical band
  56. GRB 030329, optical spectroscopy
  57. GRB 030329: optical photometry
  58. GRB030329: Optical observations
  59. Photometry of GRB030329 - Constant OT Magnitude
  60. GRB 030329, R-band observations
  61. GRB 030329, R-band light curve
  62. GRB 030329: further optical observations
  63. GRB030329 - OT brightens
  64. GRB 030329: OT observations at Kanazawa
  65. GRB 030329 RBO V Optical Observations
  66. GRB 030329, optical photometry
  67. GRB030329: Near Infrared Observations
  68. GRB 030324: Optical and NIR Observations
  69. GRB030329: R band light curve by MASTER
  70. GRB030329 - Light curve flattening
  71. GRB 030329: SARA Optical Observations
  72. GRB030329: R and B observations
  73. GRB 030329, optical observations
  74. GRB030329: Optical observations
  75. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  76. GRB 030329: Light curve observed during the change of its slope.
  77. GRB030329, SPM optical observations
  78. GRB030329: ROTSE network observes steepening of decay curve
  79. GRB 030329: Optical decay and synthesis
  80. GRB030329 optical observations
  81. GRB030329: optical spectroscopy with the TNG
  82. GRB 030329: Radio Observations
  83. GRB 030329, optical spectroscopy
  84. GRB 030329: Optical pre-Imaging
  85. GRB 030329: visual observations
  86. GRB 030329: Upper limit from 5.6 hours before trigger
  87. GRB030328: X-ray Afterglow Observed with Chandra
  88. GRB030329: Optical observations
  89. GRB 030329, R-band observations, supplement
  90. GRB030329 optical observations
  91. GRB030329:optical observations by MASTER
  92. GRB 030329: optical observations
  93. GRB 030329, R-band observations
  94. GRB030329: Upper limits from recent and historical observations.
  95. GRB 030329: Optical Afterglow Observations
  96. GRB 030329: precise position from Kyoto images
  97. GRB 030328 Optical Observations
  98. GRB030328: Decay index
  99. GRB 030328: Optical observations
  100. GRB 030328: optical observations

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