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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"

41685 results found.

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

Advanced

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