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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"

15987 results found.

  1. GRB 030413: Optical Observations
  2. GRB 030329 Rc observations
  3. GRB030329, optical position
  4. GRB 030329 VLBA Observations
  5. GRB 030329, light curve flattens
  6. GRB 030329: VLT V-band photometry
  7. If the SN/GRB connection confirmed
  8. GRB030329: RTT150 optical observations
  9. GRB030329: Near Infrared Observations at Gunma
  10. GRB030329: HET spectroscopic monitoring
  11. Kiso observation of the GRB030329 at April 6
  12. GRB 030329, color evolution
  13. GRB030328, UBVRcIc field photometry
  14. GRB030329: Optical observcations
  15. GRB 030329 Optical observations
  16. GRB 030329, color evolution
  17. GRB 030329: possible color change
  18. GRB030329: RTT150 optical observations
  19. GRB030329: Kiso B and R band observations
  20. GRB030329: RTT150 optical observation
  21. GRB 030329: SARA Optical Observations
  22. GRB 030329: SARA Optical Observations
  23. GRB 030329, BVRI photometry
  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. GRB030329, cessation of fading
  29. GRB030329: final R-band light curve by MASTER
  30. GRB 030329: SARA Optical Observations
  31. GRB 030329: SARA Optical Observations
  32. OT GRB light curves and SN predictions
  33. GRB030329, optical observation
  34. GRB030329, optical observation
  35. GRB030329, new UBVRcIc field photometry
  36. GRB 030329, light curve and SN prediction
  37. GRB030329: optical observations at Tokyo Tech
  38. GRB 030329: optical observations
  39. GRB 030329, BRI photometry
  40. GRB 030329 , SPM optical observations
  41. GRB030329: Optical observations at Teramo
  42. GRB 030329: Additional Mt. Laguna Optical Observations
  43. GRB 030329: SARA Optical Observations
  44. GRB 030329: Observations with ANDICAM
  45. GRB030329: Optical observations
  46. GRB030329: further optical photometry and evidence for a light curve discontinuity
  47. GRB 030329: KAIT optical photometry
  48. GRB030329 Further RBO Optical Observations
  49. GRB 030329: SARA Optical Observations
  50. GRB 030329: optical observations
  51. GRB 030329: beginning of the new fading phase in optical band
  52. GRB 030329, optical spectroscopy
  53. GRB 030329: optical photometry
  54. GRB030329: Optical observations
  55. GRB 030329: further optical observations
  56. GRB 030329 RBO V Optical Observations
  57. GRB 030329, optical photometry
  58. GRB030329: Near Infrared Observations
  59. GRB 030324: Optical and NIR Observations
  60. GRB 030328, optical photometry
  61. GRB 030329: SARA Optical Observations
  62. GRB 030324, optical search
  63. GRB030329 - near contemporaneous optical limits from CONCAM
  64. GRB 030329, optical observations
  65. GRB030329: Optical observations
  66. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  67. GRB 030329: Light curve observed during the change of its slope.
  68. GRB030329, BVRcIc field photometry
  69. GRB030329, SPM optical observations
  70. GRB 030329: Optical Decay
  71. Redshift of GRB 030329
  72. GRB030329: ROTSE network observes steepening of decay curve
  73. GRB 030329, optical photometry
  74. GRB 030329: Optical decay and synthesis
  75. GRB030329 optical observations
  76. GRB030329: optical spectroscopy with the TNG
  77. GRB 030329: Radio Observations
  78. GRB 030329, optical spectroscopy
  79. GRB 030329: still bright
  80. GRB 030329: Optical pre-Imaging
  81. GRB 030329: visual observations
  82. GRB 030329: Upper limit from 5.6 hours before trigger
  83. GRB030328: R optical observation
  84. GRB030328: X-ray Afterglow Observed with Chandra
  85. GRB 030323: Gemini South VRI obsevations.
  86. GRB030329: Optical observations
  87. GRB030329 optical observations
  88. GRB030329:optical observations by MASTER
  89. GRB 030329: optical observations
  90. GRB030329: Upper limits from recent and historical observations.
  91. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  92. GRB 030329: Optical Afterglow Observations
  93. GRB 030329: precise position from Kyoto images
  94. GRB 030328 Optical Observations
  95. GRB 030328: Optical observations
  96. GRB 030328: optical observations
  97. GRB 030329: Optical afterglow fading
  98. GRB 030329: Optical afterglow candidate
  99. GRB 030329: Optical afterglow candidate
  100. GRB030328: optical spectroscopy at TNG

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