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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"

36131 results found.

  1. GRB000830: Optical observations
  2. GRB000830, TNG B-band observations
  3. GRB000830, BVRI field photometry
  4. GRB000830: Optical observations
  5. GRB000210, Optical observations
  6. Chandra Position of GRB000210
  7. "Snapshot" afterglow IDs and GRB 000830
  8. IPN triangulation of GRB000830
  9. HST/STIS observations of the host galaxy of GRB 980329
  10. HST/STIS observations of the chaotic environment of GRB 980613
  11. IPN localization of GRB000820
  12. GRB000801 & GRB000730, Gamma Ray Observations
  13. GRB000730, Gamma Ray Observations
  14. GRB000812, Radio observations
  15. IPN localization of GRB000812
  16. IPN localization of GRB000811
  17. GRB000801, Gamma Ray Observations
  18. GRB000801, VLT-Antu R-band observations
  19. GRB 991208 Host Galaxy Imaging
  20. Updated IPN coordinates for GRB000801
  21. IPN localization of GRB000801
  22. IPN localization of GRB000730B
  23. IPN localization of GRB000730B
  24. IPN localization of GRB000730
  25. GRB 990510: Possible detection of a host galaxy
  26. GRB 990510 Host Galaxy Discovery
  27. GRB 000727, optical observations
  28. IPN localization of GRB000727
  29. GRB 990705, HST/STIS observations of the host galaxy
  30. GRB 990712: Late time HST/STIS Observations
  31. GRB 991216, HST/STIS observations
  32. GRB981226, HST/STIS observations of the host galaxy
  33. GRB 000630: Detection of the Optical Afterglow
  34. GRB000630, Revised BVRI Field Photometry
  35. GRB000630, Optical Observations
  36. GRB000630, optical observations
  37. GRB000630, BVRI Field Photometry
  38. GRB000630, optical observations
  39. GRB000630: Optical observations
  40. possible optical counterpart of GRB 000630
  41. IPN triangulation of GRB000630
  42. GRB 000623, optical observations
  43. GRB 000620, optical observations
  44. GRB000418, HST/STIS Observations
  45. GRB990123: Late-time HST/STIS observations of the host
  46. GRB 990506, HST/STIS Observations of the Host Galaxy
  47. GRB000623
  48. GRB 000620: J-band observations
  49. GRB990308, HST/STIS observations of the host galaxy
  50. IPN annulus for GRB000620
  51. GRB000615, Radio observations
  52. GRB000607, optical observations
  53. GRB 000615: NIR further observations
  54. BeppoSAX ALERT: GRB000620
  55. GRB000620: BeppoSAX Alert
  56. GRB990123, HST/STIS observations of the host galaxy
  57. GRB 000615, near-infrared observations
  58. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  59. GRB000616 [IPN Position]
  60. GRB000615B [IPN Position]
  61. GRB000615, further R-band photometry
  62. GRB 000615: NIR observations
  63. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  64. GRB000615, R-band photometry
  65. GRB980425, HST/STIS observations of the host galaxy
  66. GRB000615: BeppoSAX GRB Alert
  67. The Hosts of GRB 980703 and GRB 971214
  68. GRB 000301C: Further Late-Time HST/STIS observations
  69. GRB000528: follow-up X-ray measurements and update of IPN annulus
  70. GRB980519, HST/STIS observations of the host galaxy
  71. GRB000607, Radio Observations
  72. GRB000604 - Optical observations
  73. GRB000607, A SHORT, HARD BURST
  74. GRB000604, optical observations
  75. GRB000528, optical observations at ESO
  76. GRB 000604 optical observations
  77. GRB 000418: Detection of the Host Galaxy
  78. GRB000604, optical observations, comparison with DPOSS
  79. GRB000604 [IPN Position]
  80. X-ray Afterglow of GRB 000529
  81. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  82. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  83. IPN localization and time history of GRB000528
  84. New IPN localization of GRB000529
  85. GRB 000528 - WFC measurements
  86. GRB000528: BeppoSAX GRBM observations
  87. GRB 000528 Optical Observations
  88. GRB000519, BVRI field photometry
  89. IPN triangulation of GRB000519
  90. IPN triangulation of GRB000516
  91. Re: GRB000508B : Optical observations
  92. GRB 000418, Optical observation
  93. GRB000508B, optical photometry
  94. GRB000508B, BVR field photometry
  95. Possible GRB-related phenomenon
  96. RXTE/ASM and IPN localization of GRB 000508B
  97. GRB000424, UBVRI field photometry
  98. GRB 000424 Optical Observations
  99. GRB000418, UBVRI field photometry update
  100. The redshift of GRB 000418

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