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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"

15994 results found.

  1. GRB030329: Optical Observations
  2. OT GRB 030329: early UBVRcIc spectral evolution
  3. GRB030329, UBVRI polarimetry, R-polarization
  4. GRB 030329: SARA Optical Observations
  5. OT GRB 030329: early spectrum
  6. GRB030324: Candidate Optical Afterglow (Erratum)
  7. GRB030324: Candidate Optical Afterglow
  8. GRB 030413: Optical Observations
  9. GRB 030329 Rc observations
  10. GRB030329, optical position
  11. GRB 030329 VLBA Observations
  12. GRB 030329, light curve flattens
  13. GRB 030329: VLT V-band photometry
  14. If the SN/GRB connection confirmed
  15. GRB030329: RTT150 optical observations
  16. GRB030329: Near Infrared Observations at Gunma
  17. GRB030329: HET spectroscopic monitoring
  18. Kiso observation of the GRB030329 at April 6
  19. GRB 030329, color evolution
  20. GRB030328, UBVRcIc field photometry
  21. GRB030329: Optical observcations
  22. GRB 030329 Optical observations
  23. GRB 030329, color evolution
  24. GRB 030329: possible color change
  25. GRB030329: RTT150 optical observations
  26. GRB030329: Kiso B and R band observations
  27. GRB030329: RTT150 optical observation
  28. GRB 030329: SARA Optical Observations
  29. GRB 030329: SARA Optical Observations
  30. GRB 030329, BVRI photometry
  31. GRB030329: Optical observations
  32. SDSS 0.5m PT observations of GRB030329 (correction)
  33. SDSS 0.5m PT observations of GRB030329
  34. GRB 030329, Optical observations
  35. GRB030329, cessation of fading
  36. GRB030329: final R-band light curve by MASTER
  37. GRB 030329: SARA Optical Observations
  38. GRB 030329: SARA Optical Observations
  39. OT GRB light curves and SN predictions
  40. GRB030329, optical observation
  41. GRB030329, optical observation
  42. GRB030329, new UBVRcIc field photometry
  43. GRB 030329, light curve and SN prediction
  44. GRB030329: optical observations at Tokyo Tech
  45. GRB 030329: optical observations
  46. GRB 030329, BRI photometry
  47. GRB 030329 , SPM optical observations
  48. GRB030329: Optical observations at Teramo
  49. GRB 030329: Additional Mt. Laguna Optical Observations
  50. GRB 030329: SARA Optical Observations
  51. GRB 030329: Observations with ANDICAM
  52. GRB030329: Optical observations
  53. GRB030329: further optical photometry and evidence for a light curve discontinuity
  54. GRB 030329: KAIT optical photometry
  55. GRB030329 Further RBO Optical Observations
  56. GRB 030329: SARA Optical Observations
  57. GRB 030329: optical observations
  58. GRB 030329: beginning of the new fading phase in optical band
  59. GRB 030329, optical spectroscopy
  60. GRB 030329: optical photometry
  61. GRB030329: Optical observations
  62. GRB 030329: further optical observations
  63. GRB 030329 RBO V Optical Observations
  64. GRB 030329, optical photometry
  65. GRB030329: Near Infrared Observations
  66. GRB 030324: Optical and NIR Observations
  67. GRB 030328, optical photometry
  68. GRB 030329: SARA Optical Observations
  69. GRB 030324, optical search
  70. GRB030329 - near contemporaneous optical limits from CONCAM
  71. GRB 030329, optical observations
  72. GRB030329: Optical observations
  73. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  74. GRB 030329: Light curve observed during the change of its slope.
  75. GRB030329, BVRcIc field photometry
  76. GRB030329, SPM optical observations
  77. GRB 030329: Optical Decay
  78. Redshift of GRB 030329
  79. GRB030329: ROTSE network observes steepening of decay curve
  80. GRB 030329, optical photometry
  81. GRB 030329: Optical decay and synthesis
  82. GRB030329 optical observations
  83. GRB030329: optical spectroscopy with the TNG
  84. GRB 030329: Radio Observations
  85. GRB 030329, optical spectroscopy
  86. GRB 030329: still bright
  87. GRB 030329: Optical pre-Imaging
  88. GRB 030329: visual observations
  89. GRB 030329: Upper limit from 5.6 hours before trigger
  90. GRB030328: R optical observation
  91. GRB030328: X-ray Afterglow Observed with Chandra
  92. GRB 030323: Gemini South VRI obsevations.
  93. GRB030329: Optical observations
  94. GRB030329 optical observations
  95. GRB030329:optical observations by MASTER
  96. GRB 030329: optical observations
  97. GRB030329: Upper limits from recent and historical observations.
  98. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  99. GRB 030329: Optical Afterglow Observations
  100. GRB 030329: precise position from Kyoto images

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