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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"

41684 results found.

  1. IPN localization of GRB000801
  2. IPN localization of GRB000801
  3. IPN localization of GRB000730B
  4. IPN localization of GRB000730B
  5. GRB 990510: Possible detection of a host galaxy
  6. GRB 990510 Host Galaxy Discovery
  7. GRB 000727, optical observations
  8. IPN localization of GRB000727
  9. GRB 990705, HST/STIS observations of the host galaxy
  10. GRB 990712: Late time HST/STIS Observations
  11. GRB 991216, HST/STIS observations
  12. GRB000620, Radio Observations
  13. GRB981226, HST/STIS observations of the host galaxy
  14. GRB000630, optical observations
  15. GRB 000630: Detection of the Optical Afterglow
  16. GRB000630, Revised BVRI Field Photometry
  17. GRB000630, Optical Observations
  18. GRB000630, optical observations
  19. GRB000630, optical observations
  20. GRB000630, BVRI Field Photometry
  21. GRB000630, optical observations
  22. GRB000630, optical observations
  23. GRB000630: Optical observations
  24. GRB000630, Radio Observations
  25. possible optical counterpart of GRB 000630
  26. GRB 000623, optical observations
  27. GRB 000620, optical observations
  28. GRB000418, HST/STIS Observations
  29. GRB990123: Late-time HST/STIS observations of the host
  30. GRB 990506, HST/STIS Observations of the Host Galaxy
  31. GRB 000620: J-band observations
  32. GRB000620, optical observations
  33. GRB000615: H-band observations
  34. GRB990308, HST/STIS observations of the host galaxy
  35. GRB000620 - Optical observations
  36. GRB000620 Optical observations
  37. IPN annulus for GRB000620
  38. GRB000620: BeppoSAX WFC and GRBM detection
  39. GRB000615, Radio observations
  40. GRB000607, optical observations
  41. GRB 000615: NIR further observations
  42. GRB990123, HST/STIS observations of the host galaxy
  43. GRB000616 optical observations
  44. GRB 000615, near-infrared observations
  45. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  46. GRB000615, further R-band photometry
  47. GRB 000615: NIR observations
  48. GRB000615, R-band photometry
  49. GRB980425, HST/STIS observations of the host galaxy
  50. The Hosts of GRB 980703 and GRB 971214
  51. GRB 000301C: Further Late-Time HST/STIS observations
  52. GRB000528: follow-up X-ray measurements and update of IPN annulus
  53. Optical Follow-up of GRB000529 Error Box
  54. GRB980519, HST/STIS observations of the host galaxy
  55. GRB000607, Radio Observations
  56. GRB000604 optical non-detection
  57. GRB000604 - Optical observations
  58. GRB000607, A SHORT, HARD BURST
  59. GRB000604, optical observations
  60. GRB000528, optical observations at ESO
  61. GRB 000604 optical observations
  62. GRB 000418: Detection of the Host Galaxy
  63. GRB000604, optical observations, comparison with DPOSS
  64. GRB000528, Radio Observations
  65. X-ray Afterglow of GRB 000529
  66. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  67. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  68. IPN localization and time history of GRB000528
  69. New IPN localization of GRB000529
  70. GRB000519: Optical observations
  71. IPN localization of GRB000529
  72. GRB 000528 - WFC measurements
  73. GRB000528: BeppoSAX GRBM observations
  74. GRB 000528 Optical Observations
  75. GRB000519, BVRI field photometry
  76. IPN triangulation of GRB000519
  77. Re: GRB000508B : Optical observations
  78. GRB 000418, Optical observation
  79. GRB000508B, optical photometry
  80. GRB000508B, BVR field photometry
  81. Possible GRB-related phenomenon
  82. RXTE/ASM and IPN localization of GRB 000508B
  83. GRB000424, UBVRI field photometry
  84. GRB 000424 Optical Observations
  85. GRB000418, UBVRI field photometry update
  86. The redshift of GRB 000418
  87. GRB000424, optical observations
  88. GRB 000429, optical observation
  89. GRB 000429, UBVRI field photometry
  90. GRB 000418, UBVRI field photometry
  91. GRB000418, Radio detection
  92. GRB000418, K'-band photometry
  93. GRB 000418, Optical Observation
  94. GRB 000418, optical observation
  95. GRB000424 Optical Observations
  96. GRB 000418, Optical Observation
  97. GRB000424, optical observations
  98. GRB000424, optical observations
  99. GRB 000424, Optical Observations
  100. GRB 000418, Optical Observation

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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