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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"

36352 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. GRB000630, Radio 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. GRB000615: H-band observations
  51. GRB990308, HST/STIS observations of the host galaxy
  52. IPN annulus for GRB000620
  53. GRB000615, Radio observations
  54. GRB000607, optical observations
  55. GRB 000615: NIR further observations
  56. BeppoSAX ALERT: GRB000620
  57. GRB000620: BeppoSAX Alert
  58. GRB990123, HST/STIS observations of the host galaxy
  59. GRB 000615, near-infrared observations
  60. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  61. GRB000616 [IPN Position]
  62. GRB000615B [IPN Position]
  63. GRB000615, further R-band photometry
  64. GRB 000615: NIR observations
  65. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  66. GRB000615, R-band photometry
  67. GRB980425, HST/STIS observations of the host galaxy
  68. GRB000615: BeppoSAX GRB Alert
  69. The Hosts of GRB 980703 and GRB 971214
  70. GRB 000301C: Further Late-Time HST/STIS observations
  71. GRB000528: follow-up X-ray measurements and update of IPN annulus
  72. GRB980519, HST/STIS observations of the host galaxy
  73. GRB000607, Radio Observations
  74. GRB000604 - Optical observations
  75. GRB000607, A SHORT, HARD BURST
  76. GRB000604, optical observations
  77. GRB000528, optical observations at ESO
  78. GRB 000604 optical observations
  79. GRB 000418: Detection of the Host Galaxy
  80. GRB000604, optical observations, comparison with DPOSS
  81. GRB000604 [IPN Position]
  82. X-ray Afterglow of GRB 000529
  83. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  84. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  85. IPN localization and time history of GRB000528
  86. New IPN localization of GRB000529
  87. GRB 000528 - WFC measurements
  88. GRB000528: BeppoSAX GRBM observations
  89. GRB 000528 Optical Observations
  90. GRB000519, BVRI field photometry
  91. IPN triangulation of GRB000519
  92. IPN triangulation of GRB000516
  93. Re: GRB000508B : Optical observations
  94. GRB 000418, Optical observation
  95. GRB000508B, optical photometry
  96. GRB000508B, BVR field photometry
  97. Possible GRB-related phenomenon
  98. RXTE/ASM and IPN localization of GRB 000508B
  99. GRB000424, UBVRI field photometry
  100. GRB 000424 Optical Observations

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