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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"

45446 results found.

  1. GRB 990705, HST/STIS observations of the host galaxy
  2. GRB 990712: Late time HST/STIS Observations
  3. GRB 991216, HST/STIS observations
  4. GRB000620, Radio Observations
  5. GRB981226, HST/STIS observations of the host galaxy
  6. GRB000630, optical observations
  7. GRB 000630: Detection of the Optical Afterglow
  8. GRB000630, Revised BVRI Field Photometry
  9. GRB000630, Optical Observations
  10. GRB000630, optical observations
  11. GRB000630, optical observations
  12. GRB000630, BVRI Field Photometry
  13. GRB000630, optical observations
  14. GRB000630, optical observations
  15. GRB000630: Optical observations
  16. GRB000630, Radio Observations
  17. possible optical counterpart of GRB 000630
  18. IPN triangulation of GRB000630
  19. GRB 000623, optical observations
  20. GRB 000620, optical observations
  21. GRB000418, HST/STIS Observations
  22. GRB990123: Late-time HST/STIS observations of the host
  23. GRB 990506, HST/STIS Observations of the Host Galaxy
  24. GRB000623
  25. GRB 000620: J-band observations
  26. GRB000620, optical observations
  27. GRB000615: H-band observations
  28. GRB990308, HST/STIS observations of the host galaxy
  29. GRB000620 - Optical observations
  30. GRB000620 Optical observations
  31. IPN annulus for GRB000620
  32. GRB000620: BeppoSAX WFC and GRBM detection
  33. GRB000615, Radio observations
  34. GRB000607, optical observations
  35. GRB 000615: NIR further observations
  36. GRB000620: refined BeppoSAX/WFC coordinates
  37. BeppoSAX ALERT: GRB000620
  38. GRB000620: BeppoSAX Alert
  39. GRB990123, HST/STIS observations of the host galaxy
  40. GRB000616 optical observations
  41. GRB 000615, near-infrared observations
  42. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  43. GRB000616 [IPN Position]
  44. GRB000615B [IPN Position]
  45. GRB000615, further R-band photometry
  46. GRB 000615: NIR observations
  47. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  48. GRB000615, R-band photometry
  49. GRB000615: BeppoSAX refined coordinates
  50. GRB980425, HST/STIS observations of the host galaxy
  51. GRB000615: BeppoSAX GRB Alert
  52. The Hosts of GRB 980703 and GRB 971214
  53. GRB 000301C: Further Late-Time HST/STIS observations
  54. GRB000528: follow-up X-ray measurements and update of IPN annulus
  55. Optical Follow-up of GRB000529 Error Box
  56. GRB980519, HST/STIS observations of the host galaxy
  57. GRB000607, Radio Observations
  58. BeppoSAX X-ray transient/possible GRB000608
  59. GRB000604 optical non-detection
  60. GRB000604 - Optical observations
  61. GRB000607, A SHORT, HARD BURST
  62. GRB000604, optical observations
  63. GRB000528, optical observations at ESO
  64. GRB 000604 optical observations
  65. GRB 000418: Detection of the Host Galaxy
  66. GRB000604, optical observations, comparison with DPOSS
  67. GRB000604 [IPN Position]
  68. GRB000528, Radio Observations
  69. X-ray Afterglow of GRB 000529
  70. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  71. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  72. GRB000529: Optical Observations
  73. IPN localization and time history of GRB000528
  74. New IPN localization of GRB000529
  75. GRB000519: Optical observations
  76. IPN localization of GRB000529
  77. GRB 000528 - WFC measurements
  78. GRB000529: BeppoSAX WFC position
  79. GRB000528: BeppoSAX GRBM observations
  80. GRB 000528 Optical Observations
  81. GRB000519, BVRI field photometry
  82. IPN triangulation of GRB000519
  83. IPN triangulation of GRB000516
  84. Re: GRB000508B : Optical observations
  85. GRB 000418, Optical observation
  86. GRB000508B, optical photometry
  87. GRB000508B, BVR field photometry
  88. Possible GRB-related phenomenon
  89. RXTE/ASM and IPN localization of GRB 000508B
  90. GRB000424, UBVRI field photometry
  91. GRB 000424 Optical Observations
  92. GRB000418, UBVRI field photometry update
  93. The redshift of GRB 000418
  94. GRB000424, optical observations
  95. GRB 000429, optical observation
  96. GRB 000429, UBVRI field photometry
  97. IPN localization of GRB000429
  98. GRB 000418, UBVRI field photometry
  99. GRB000418, Radio detection
  100. GRB000418, K'-band photometry

Advanced

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