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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"

38363 results found.

  1. Kiso observation of the GRB030329 at April 6
  2. GRB 030329, color evolution
  3. GRB030328, UBVRcIc field photometry
  4. GRB030329: BV photographic observations
  5. GRB 030329 Optical observations
  6. GRB 030329, color evolution
  7. GRB030329: RTT150 optical observations
  8. GRB 030329: Supernova Spectrum Emerging
  9. GRB030329: Kiso B and R band observations
  10. GRB030329: More AAVSO VR obs
  11. GRB030328: R upper limit after 6 hours by MASTER
  12. GRB 030329: BV photographic observations
  13. GRB 030329: SARA Optical Observations
  14. GRB 030329: SARA Optical Observations
  15. GRB030329, fading resumes
  16. GRB 030329, BVRI photometry
  17. GRB030329: Optical observations
  18. SDSS 0.5m PT observations of GRB030329 (correction)
  19. SDSS 0.5m PT observations of GRB030329
  20. GRB030329, cessation of fading
  21. GRB030329: final R-band light curve by MASTER
  22. GRB 030329: Sub-millimeter detection
  23. GRB 030329: SARA Optical Observations
  24. GRB 030329: SARA Optical Observations
  25. GRB030329, optical observation
  26. GRB030329, optical observation
  27. GRB030329, new UBVRcIc field photometry
  28. GRB 030329, light curve and SN prediction
  29. GRB030329: optical observations at Tokyo Tech
  30. GRB 030329, BRI photometry
  31. GRB 030329: Radio observations at GMRT
  32. GRB030329: more 15GHz observations
  33. Further AAVSO V,B,R observations of GRB030329
  34. GRB 030329: Additional Mt. Laguna Optical Observations
  35. GRB 030329: SARA Optical Observations
  36. GRB 030329: Observations with ANDICAM
  37. GRB030329: Optical observations
  38. GRB030329: further optical photometry and evidence for a light curve discontinuity
  39. GRB 030329: KAIT optical photometry
  40. GRB030329 Further RBO Optical Observations
  41. triangulation of GRB 030331 (single error box)
  42. GRB 030329: SARA Optical Observations
  43. AAVSO V & R observations of GRB030329
  44. IPN triangulation of GRB030331 (annulus)
  45. GRB 030329: optical observations
  46. IPN triangulation of GRB030329b (large error box)
  47. GRB 030329, optical spectroscopy
  48. GRB030329: Optical observations
  49. Photometry of GRB030329 - Constant OT Magnitude
  50. GRB 030329, R-band observations
  51. GRB030329 - OT brightens
  52. GRB 030329 RBO V Optical Observations
  53. GRB030329: Near Infrared Observations
  54. GRB 030324: Optical and NIR Observations
  55. GRB 030328, optical photometry
  56. GRB030329: R band light curve by MASTER
  57. GRB030329 - Light curve flattening
  58. GRB 030329: SARA Optical Observations
  59. GRB 030324, optical search
  60. GRB030329 - near contemporaneous optical limits from CONCAM
  61. GRB 030329, optical observations
  62. GRB030329: Optical observations
  63. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  64. GRB030329a: detection by Konus-Wind
  65. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  66. GRB 030329: Light curve observed during the change of its slope.
  67. GRB030329, BVRcIc field photometry
  68. GRB 030329: Optical Decay
  69. Redshift of GRB 030329
  70. GRB030329: ROTSE network observes steepening of decay curve
  71. GRB 030329, optical photometry
  72. GRB 030329: Optical decay and synthesis
  73. GRB030329 optical observations
  74. GRB030329: optical spectroscopy with the TNG
  75. GRB 030329: Radio Observations
  76. GRB 030329: still bright
  77. GRB 030329: visual observations
  78. GRB 030329: Upper limit from 5.6 hours before trigger
  79. GRB030328: R optical observation
  80. GRB030328: X-ray Afterglow Observed with Chandra
  81. GRB 030323: Gemini South VRI obsevations.
  82. GRB 030329, R-band observations
  83. GRB 030329: OT B and R photometry, decline rate
  84. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  85. RXTE detection of GRB 030329 afterglow
  86. GRB 030329: Optical Afterglow Observations
  87. GRB 030329: precise position from Kyoto images
  88. GRB 030328: optical observations
  89. GRB 030329: Optical afterglow candidate
  90. GRB 030328: OT photometry
  91. GRB030328: optical spectroscopy at TNG
  92. GRB030328: optical photometry at the TNG
  93. GRB 030328, optical observations
  94. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  95. GRB 030328: Optical observations
  96. GRB 030328: Optical afterglow candidate
  97. GRB030323 optical observations
  98. GRB030324 optical observation
  99. GRB030131, BVRcIc field photometry
  100. Possible GRB030323 localized by INTEGRAL

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