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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"

36144 results found.

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

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