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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"

44381 results found.

  1. IPN triangulation of GRB000910
  2. False GRB alarm from RXTE/ASM on 8 Sept 2000
  3. GRB 000830: Optical observations
  4. GRB000830: Optical observations
  5. GRB000830, TNG B-band observations
  6. GRB000830, BVRI field photometry
  7. GRB000830: Optical observations
  8. GRB000210, Optical observations
  9. Chandra Position of GRB000210
  10. "Snapshot" afterglow IDs and GRB 000830
  11. GRB000830: Optical observations
  12. IPN triangulation of GRB000830
  13. HST/STIS observations of the host galaxy of GRB 980329
  14. HST/STIS observations of the chaotic environment of GRB 980613
  15. IPN localization of GRB000820
  16. SGR 1806-20 burst activity
  17. GRB000812, TNG R-band observations
  18. GRB000801 & GRB000730, Gamma Ray Observations
  19. GRB000730, Gamma Ray Observations
  20. GRB000812, Radio observations
  21. IPN localization of GRB000812
  22. IPN localization of GRB000811
  23. GRB000801, Gamma Ray Observations
  24. GRB000801, VLT-Antu R-band observations
  25. GRB000301C, UBVI optical observations
  26. GRB000801, Radio Observations
  27. GRB 991208 Host Galaxy Imaging
  28. Updated IPN coordinates for GRB000801
  29. IPN localization of GRB000801
  30. IPN localization of GRB000801
  31. IPN localization of GRB000730B
  32. IPN localization of GRB000730B
  33. IPN localization of GRB000730
  34. GRB 990510: Possible detection of a host galaxy
  35. GRB 990510 Host Galaxy Discovery
  36. GRB 000727, optical observations
  37. IPN localization of GRB000727
  38. GRB 990705, HST/STIS observations of the host galaxy
  39. GRB 990712: Late time HST/STIS Observations
  40. GRB 991216, HST/STIS observations
  41. GRB000620, Radio Observations
  42. GRB981226, HST/STIS observations of the host galaxy
  43. GRB000630, optical observations
  44. GRB 000630: Detection of the Optical Afterglow
  45. GRB000630, Revised BVRI Field Photometry
  46. GRB000630, Optical Observations
  47. GRB000630, optical observations
  48. GRB000630, optical observations
  49. GRB000630, BVRI Field Photometry
  50. GRB000630, optical observations
  51. GRB000630, optical observations
  52. GRB000630: Optical observations
  53. GRB000630, Radio Observations
  54. possible optical counterpart of GRB 000630
  55. IPN triangulation of GRB000630
  56. GRB 000623, optical observations
  57. GRB 000620, optical observations
  58. GRB000418, HST/STIS Observations
  59. GRB990123: Late-time HST/STIS observations of the host
  60. GRB 990506, HST/STIS Observations of the Host Galaxy
  61. GRB000623
  62. GRB 000620: J-band observations
  63. GRB000620, optical observations
  64. GRB000615: H-band observations
  65. GRB990308, HST/STIS observations of the host galaxy
  66. GRB000620 - Optical observations
  67. GRB000620 Optical observations
  68. IPN annulus for GRB000620
  69. GRB000620: BeppoSAX WFC and GRBM detection
  70. GRB000615, Radio observations
  71. GRB000607, optical observations
  72. GRB 000615: NIR further observations
  73. GRB000620: refined BeppoSAX/WFC coordinates
  74. BeppoSAX ALERT: GRB000620
  75. GRB000620: BeppoSAX Alert
  76. GRB990123, HST/STIS observations of the host galaxy
  77. GRB000616 optical observations
  78. GRB 000615, near-infrared observations
  79. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  80. GRB000616 [IPN Position]
  81. GRB000615B [IPN Position]
  82. GRB000615, further R-band photometry
  83. GRB 000615: NIR observations
  84. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  85. GRB000615, R-band photometry
  86. GRB000615: BeppoSAX refined coordinates
  87. GRB980425, HST/STIS observations of the host galaxy
  88. GRB000615: BeppoSAX GRB Alert
  89. The Hosts of GRB 980703 and GRB 971214
  90. GRB 000301C: Further Late-Time HST/STIS observations
  91. GRB000528: follow-up X-ray measurements and update of IPN annulus
  92. Optical Follow-up of GRB000529 Error Box
  93. GRB980519, HST/STIS observations of the host galaxy
  94. GRB000607, Radio Observations
  95. BeppoSAX X-ray transient/possible GRB000608
  96. GRB000604 optical non-detection
  97. GRB000604 - Optical observations
  98. GRB000607, A SHORT, HARD BURST
  99. GRB000604, optical observations
  100. GRB000528, optical observations at ESO

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