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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"

16162 results found.

  1. GRB030329, new UBVRcIc field photometry
  2. GRB 030329, light curve and SN prediction
  3. GRB030329: optical observations at Tokyo Tech
  4. GRB 030329: optical observations
  5. GRB 030329 , SPM optical observations
  6. GRB030329: Optical observations at Teramo
  7. GRB 030329: Additional Mt. Laguna Optical Observations
  8. GRB 030329: SARA Optical Observations
  9. GRB 030329: Observations with ANDICAM
  10. GRB030329: Optical observations
  11. GRB030329: further optical photometry and evidence for a light curve discontinuity
  12. GRB 030329: KAIT optical photometry
  13. GRB030329 Further RBO Optical Observations
  14. GRB 030329: SARA Optical Observations
  15. GRB 030329: optical observations
  16. GRB 030329: beginning of the new fading phase in optical band
  17. GRB 030329, optical spectroscopy
  18. GRB 030329: optical photometry
  19. GRB030329: Optical observations
  20. GRB 030329: further optical observations
  21. GRB 030329 RBO V Optical Observations
  22. GRB 030329, optical photometry
  23. GRB030329: Near Infrared Observations
  24. GRB 030324: Optical and NIR Observations
  25. GRB 030328, optical photometry
  26. GRB 030329: SARA Optical Observations
  27. GRB 030324, optical search
  28. GRB030329 - near contemporaneous optical limits from CONCAM
  29. GRB 030329, optical observations
  30. GRB030329: Optical observations
  31. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  32. GRB 030329: Light curve observed during the change of its slope.
  33. GRB030329, BVRcIc field photometry
  34. GRB030329, SPM optical observations
  35. GRB 030329: Optical Decay
  36. Redshift of GRB 030329
  37. GRB030329: ROTSE network observes steepening of decay curve
  38. GRB 030329, optical photometry
  39. GRB 030329: Optical decay and synthesis
  40. GRB030329 optical observations
  41. GRB030329: optical spectroscopy with the TNG
  42. GRB 030329: Radio Observations
  43. GRB 030329, optical spectroscopy
  44. GRB 030329: still bright
  45. GRB 030329: Optical pre-Imaging
  46. GRB 030329: visual observations
  47. GRB 030329: Upper limit from 5.6 hours before trigger
  48. GRB030328: R optical observation
  49. GRB030328: X-ray Afterglow Observed with Chandra
  50. GRB 030323: Gemini South VRI obsevations.
  51. GRB030329: Optical observations
  52. GRB030329 optical observations
  53. GRB030329:optical observations by MASTER
  54. GRB 030329: optical observations
  55. GRB030329: Upper limits from recent and historical observations.
  56. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  57. GRB 030329: Optical Afterglow Observations
  58. GRB 030329: precise position from Kyoto images
  59. GRB 030328 Optical Observations
  60. GRB 030328: Optical observations
  61. GRB 030328: optical observations
  62. GRB 030329: Optical afterglow fading
  63. GRB 030329: Optical afterglow candidate
  64. GRB 030329: Optical afterglow candidate
  65. GRB030328: optical spectroscopy at TNG
  66. GRB030328: optical photometry at the TNG
  67. VLT spectra of GRB 030328
  68. GRB 030328, optical spectroscopy
  69. GRB 030328, optical observations
  70. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  71. GRB 030328: Optical observations
  72. GRB 030328: Finding chart
  73. GRB 030328: Optical afterglow candidate
  74. GRB030323 optical observations
  75. GRB030324 optical observation
  76. GRB030323: Detection on 2003/03/24
  77. GRB 030323: SARA Optical Observations
  78. GRB030324, optical observations
  79. GRB030324, optical observations
  80. GRB 030324: TAROT optical observations
  81. GRB 030324 (HETE #2641): Optical observations
  82. GRB030324, Optical Observations
  83. GRB030323: Upper limits from recent and historical observations.
  84. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  85. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  86. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  87. GRB030323, ROTSE-III detection of possible optical counterpart
  88. GRB030323, optical observations
  89. GRB030323, possible optical counterpart
  90. GRB 030324 optical observations
  91. GRB 030320: Optical Observations
  92. GRB 030324, optical observations
  93. GRB 030227: Optical limit at RIKEN
  94. GRB 030226 Optical observations
  95. GRB030226: Optical observations at Asiago
  96. GRB 030226: Optical observations
  97. GRB 030227: Optical observations
  98. GRB030226, BVRc observations
  99. Chandra detection of the X-ray afterglow of GRB 030226
  100. GRB 030226, further optical/NIR imaging

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