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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"

35429 results found.

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

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