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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"

44349 results found.

  1. GRB 990510 Host Galaxy Discovery
  2. GRB 000727, optical observations
  3. IPN localization of GRB000727
  4. GRB 990705, HST/STIS observations of the host galaxy
  5. GRB 990712: Late time HST/STIS Observations
  6. GRB 991216, HST/STIS observations
  7. GRB000620, Radio Observations
  8. GRB981226, HST/STIS observations of the host galaxy
  9. GRB000630, optical observations
  10. GRB 000630: Detection of the Optical Afterglow
  11. GRB000630, Revised BVRI Field Photometry
  12. GRB000630, Optical Observations
  13. GRB000630, optical observations
  14. GRB000630, optical observations
  15. GRB000630, BVRI Field Photometry
  16. GRB000630, optical observations
  17. GRB000630, optical observations
  18. GRB000630: Optical observations
  19. GRB000630, Radio Observations
  20. possible optical counterpart of GRB 000630
  21. IPN triangulation of GRB000630
  22. GRB 000623, optical observations
  23. GRB 000620, optical observations
  24. GRB000418, HST/STIS Observations
  25. GRB990123: Late-time HST/STIS observations of the host
  26. GRB 990506, HST/STIS Observations of the Host Galaxy
  27. GRB000623
  28. GRB 000620: J-band observations
  29. GRB000620, optical observations
  30. GRB000615: H-band observations
  31. GRB990308, HST/STIS observations of the host galaxy
  32. GRB000620 - Optical observations
  33. GRB000620 Optical observations
  34. IPN annulus for GRB000620
  35. GRB000620: BeppoSAX WFC and GRBM detection
  36. GRB000615, Radio observations
  37. GRB000607, optical observations
  38. GRB 000615: NIR further observations
  39. GRB000620: refined BeppoSAX/WFC coordinates
  40. BeppoSAX ALERT: GRB000620
  41. GRB000620: BeppoSAX Alert
  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. GRB000616 [IPN Position]
  47. GRB000615B [IPN Position]
  48. GRB000615, further R-band photometry
  49. GRB 000615: NIR observations
  50. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  51. GRB000615, R-band photometry
  52. GRB000615: BeppoSAX refined coordinates
  53. GRB980425, HST/STIS observations of the host galaxy
  54. GRB000615: BeppoSAX GRB Alert
  55. The Hosts of GRB 980703 and GRB 971214
  56. GRB 000301C: Further Late-Time HST/STIS observations
  57. GRB000528: follow-up X-ray measurements and update of IPN annulus
  58. Optical Follow-up of GRB000529 Error Box
  59. GRB980519, HST/STIS observations of the host galaxy
  60. GRB000607, Radio Observations
  61. BeppoSAX X-ray transient/possible GRB000608
  62. GRB000604 optical non-detection
  63. GRB000604 - Optical observations
  64. GRB000607, A SHORT, HARD BURST
  65. GRB000604, optical observations
  66. GRB000528, optical observations at ESO
  67. GRB 000604 optical observations
  68. GRB 000418: Detection of the Host Galaxy
  69. GRB000604, optical observations, comparison with DPOSS
  70. GRB000604 [IPN Position]
  71. GRB000528, Radio Observations
  72. X-ray Afterglow of GRB 000529
  73. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  74. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  75. GRB000529: Optical Observations
  76. IPN localization and time history of GRB000528
  77. New IPN localization of GRB000529
  78. GRB000519: Optical observations
  79. IPN localization of GRB000529
  80. GRB 000528 - WFC measurements
  81. GRB000529: BeppoSAX WFC position
  82. GRB000528: BeppoSAX GRBM observations
  83. GRB 000528 Optical Observations
  84. GRB000519, BVRI field photometry
  85. IPN triangulation of GRB000519
  86. IPN triangulation of GRB000516
  87. Re: GRB000508B : Optical observations
  88. GRB 000418, Optical observation
  89. GRB000508B, optical photometry
  90. GRB000508B, BVR field photometry
  91. Possible GRB-related phenomenon
  92. RXTE/ASM and IPN localization of GRB 000508B
  93. GRB000424, UBVRI field photometry
  94. GRB 000424 Optical Observations
  95. GRB000418, UBVRI field photometry update
  96. The redshift of GRB 000418
  97. GRB000424, optical observations
  98. GRB 000429, optical observation
  99. GRB 000429, UBVRI field photometry
  100. IPN localization of GRB000429

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