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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"

35428 results found.

  1. GRB000830: Optical observations
  2. GRB000210, Optical observations
  3. Chandra Position of GRB000210
  4. "Snapshot" afterglow IDs and GRB 000830
  5. IPN triangulation of GRB000830
  6. HST/STIS observations of the host galaxy of GRB 980329
  7. HST/STIS observations of the chaotic environment of GRB 980613
  8. IPN localization of GRB000820
  9. GRB000801 & GRB000730, Gamma Ray Observations
  10. GRB000730, Gamma Ray Observations
  11. GRB000812, Radio observations
  12. IPN localization of GRB000812
  13. IPN localization of GRB000811
  14. GRB000801, Gamma Ray Observations
  15. GRB000801, VLT-Antu R-band observations
  16. GRB 991208 Host Galaxy Imaging
  17. Updated IPN coordinates for GRB000801
  18. IPN localization of GRB000801
  19. IPN localization of GRB000730B
  20. IPN localization of GRB000730B
  21. IPN localization of GRB000730
  22. GRB 990510: Possible detection of a host galaxy
  23. GRB 990510 Host Galaxy Discovery
  24. GRB 000727, optical observations
  25. IPN localization of GRB000727
  26. GRB 990705, HST/STIS observations of the host galaxy
  27. GRB 990712: Late time HST/STIS Observations
  28. GRB 991216, HST/STIS observations
  29. GRB981226, HST/STIS observations of the host galaxy
  30. GRB 000630: Detection of the Optical Afterglow
  31. GRB000630, Revised BVRI Field Photometry
  32. GRB000630, Optical Observations
  33. GRB000630, optical observations
  34. GRB000630, BVRI Field Photometry
  35. GRB000630, optical observations
  36. GRB000630: Optical observations
  37. possible optical counterpart of GRB 000630
  38. IPN triangulation of GRB000630
  39. GRB 000623, optical observations
  40. GRB 000620, optical observations
  41. GRB000418, HST/STIS Observations
  42. GRB990123: Late-time HST/STIS observations of the host
  43. GRB 990506, HST/STIS Observations of the Host Galaxy
  44. GRB000623
  45. GRB 000620: J-band observations
  46. GRB990308, HST/STIS observations of the host galaxy
  47. IPN annulus for GRB000620
  48. GRB000615, Radio observations
  49. GRB000607, optical observations
  50. GRB 000615: NIR further observations
  51. BeppoSAX ALERT: GRB000620
  52. GRB000620: BeppoSAX Alert
  53. GRB990123, HST/STIS observations of the host galaxy
  54. GRB 000615, near-infrared observations
  55. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  56. GRB000616 [IPN Position]
  57. GRB000615B [IPN Position]
  58. GRB000615, further R-band photometry
  59. GRB 000615: NIR observations
  60. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  61. GRB000615, R-band photometry
  62. GRB980425, HST/STIS observations of the host galaxy
  63. GRB000615: BeppoSAX GRB Alert
  64. The Hosts of GRB 980703 and GRB 971214
  65. GRB 000301C: Further Late-Time HST/STIS observations
  66. GRB000528: follow-up X-ray measurements and update of IPN annulus
  67. GRB980519, HST/STIS observations of the host galaxy
  68. GRB000607, Radio Observations
  69. GRB000604 - Optical observations
  70. GRB000607, A SHORT, HARD BURST
  71. GRB000604, optical observations
  72. GRB000528, optical observations at ESO
  73. GRB 000604 optical observations
  74. GRB 000418: Detection of the Host Galaxy
  75. GRB000604, optical observations, comparison with DPOSS
  76. GRB000604 [IPN Position]
  77. X-ray Afterglow of GRB 000529
  78. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  79. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  80. IPN localization and time history of GRB000528
  81. New IPN localization of GRB000529
  82. GRB 000528 - WFC measurements
  83. GRB000528: BeppoSAX GRBM observations
  84. GRB 000528 Optical Observations
  85. GRB000519, BVRI field photometry
  86. IPN triangulation of GRB000519
  87. IPN triangulation of GRB000516
  88. Re: GRB000508B : Optical observations
  89. GRB 000418, Optical observation
  90. GRB000508B, optical photometry
  91. GRB000508B, BVR field photometry
  92. Possible GRB-related phenomenon
  93. RXTE/ASM and IPN localization of GRB 000508B
  94. GRB000424, UBVRI field photometry
  95. GRB 000424 Optical Observations
  96. GRB000418, UBVRI field photometry update
  97. The redshift of GRB 000418
  98. GRB 000429, optical observation
  99. GRB 000429, UBVRI field photometry
  100. IPN localization of GRB000429

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