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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"

45437 results found.

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

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