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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"

35339 results found.

  1. Spectroscopic Redshift of GRB 000926
  2. GRB 000926, Optical Observation
  3. GRB 000926: Optical candidate
  4. Optical candidate for GRB000926
  5. IPN triangulation of GRB000926
  6. GRB 000911, BVRI field photometry
  7. GRB000911: Sub-millimeter observations
  8. IPN triangulation of GRB000925
  9. IPN triangulation of GRB000911
  10. IPN triangulation of GRB000910
  11. False GRB alarm from RXTE/ASM on 8 Sept 2000
  12. GRB 000830: Optical observations
  13. GRB000830: Optical observations
  14. GRB000830, TNG B-band observations
  15. GRB000830, BVRI field photometry
  16. GRB000830: Optical observations
  17. GRB000210, Optical observations
  18. Chandra Position of GRB000210
  19. "Snapshot" afterglow IDs and GRB 000830
  20. IPN triangulation of GRB000830
  21. HST/STIS observations of the host galaxy of GRB 980329
  22. HST/STIS observations of the chaotic environment of GRB 980613
  23. IPN localization of GRB000820
  24. GRB000801 & GRB000730, Gamma Ray Observations
  25. GRB000730, Gamma Ray Observations
  26. GRB000812, Radio observations
  27. IPN localization of GRB000812
  28. IPN localization of GRB000811
  29. GRB000801, Gamma Ray Observations
  30. GRB000801, VLT-Antu R-band observations
  31. GRB 991208 Host Galaxy Imaging
  32. Updated IPN coordinates for GRB000801
  33. IPN localization of GRB000801
  34. IPN localization of GRB000730B
  35. IPN localization of GRB000730B
  36. IPN localization of GRB000730
  37. GRB 990510: Possible detection of a host galaxy
  38. GRB 990510 Host Galaxy Discovery
  39. GRB 000727, optical observations
  40. IPN localization of GRB000727
  41. GRB 990705, HST/STIS observations of the host galaxy
  42. GRB 990712: Late time HST/STIS Observations
  43. GRB 991216, HST/STIS observations
  44. GRB981226, HST/STIS observations of the host galaxy
  45. GRB 000630: Detection of the Optical Afterglow
  46. GRB000630, Revised BVRI Field Photometry
  47. GRB000630, Optical Observations
  48. GRB000630, optical observations
  49. GRB000630, BVRI Field Photometry
  50. GRB000630, optical observations
  51. GRB000630: Optical observations
  52. possible optical counterpart of GRB 000630
  53. IPN triangulation of GRB000630
  54. GRB 000623, optical observations
  55. GRB 000620, optical observations
  56. GRB000418, HST/STIS Observations
  57. GRB990123: Late-time HST/STIS observations of the host
  58. GRB 990506, HST/STIS Observations of the Host Galaxy
  59. GRB000623
  60. GRB 000620: J-band observations
  61. GRB990308, HST/STIS observations of the host galaxy
  62. IPN annulus for GRB000620
  63. GRB000615, Radio observations
  64. GRB000607, optical observations
  65. GRB 000615: NIR further observations
  66. BeppoSAX ALERT: GRB000620
  67. GRB000620: BeppoSAX Alert
  68. GRB990123, HST/STIS observations of the host galaxy
  69. GRB 000615, near-infrared observations
  70. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  71. GRB000616 [IPN Position]
  72. GRB000615B [IPN Position]
  73. GRB000615, further R-band photometry
  74. GRB 000615: NIR observations
  75. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  76. GRB000615, R-band photometry
  77. GRB980425, HST/STIS observations of the host galaxy
  78. GRB000615: BeppoSAX GRB Alert
  79. The Hosts of GRB 980703 and GRB 971214
  80. GRB 000301C: Further Late-Time HST/STIS observations
  81. GRB000528: follow-up X-ray measurements and update of IPN annulus
  82. GRB980519, HST/STIS observations of the host galaxy
  83. GRB000607, Radio Observations
  84. GRB000604 - Optical observations
  85. GRB000607, A SHORT, HARD BURST
  86. GRB000604, optical observations
  87. GRB000528, optical observations at ESO
  88. GRB 000604 optical observations
  89. GRB 000418: Detection of the Host Galaxy
  90. GRB000604, optical observations, comparison with DPOSS
  91. GRB000604 [IPN Position]
  92. X-ray Afterglow of GRB 000529
  93. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  94. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  95. IPN localization and time history of GRB000528
  96. New IPN localization of GRB000529
  97. GRB 000528 - WFC measurements
  98. GRB000528: BeppoSAX GRBM observations
  99. GRB 000528 Optical Observations
  100. GRB000519, BVRI field photometry

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