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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"

36028 results found.

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

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