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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"

37513 results found.

  1. IPN localization of GRB000812
  2. IPN localization of GRB000811
  3. GRB000801, Gamma Ray Observations
  4. GRB000801, VLT-Antu R-band observations
  5. GRB 991208 Host Galaxy Imaging
  6. Updated IPN coordinates for GRB000801
  7. IPN localization of GRB000801
  8. IPN localization of GRB000730B
  9. IPN localization of GRB000730B
  10. IPN localization of GRB000730
  11. GRB 990510: Possible detection of a host galaxy
  12. GRB 990510 Host Galaxy Discovery
  13. GRB 000727, optical observations
  14. IPN localization of GRB000727
  15. GRB 990705, HST/STIS observations of the host galaxy
  16. GRB 990712: Late time HST/STIS Observations
  17. GRB 991216, HST/STIS observations
  18. GRB981226, HST/STIS observations of the host galaxy
  19. GRB 000630: Detection of the Optical Afterglow
  20. GRB000630, Revised BVRI Field Photometry
  21. GRB000630, Optical Observations
  22. GRB000630, optical observations
  23. GRB000630, BVRI Field Photometry
  24. GRB000630, optical observations
  25. GRB000630: Optical observations
  26. possible optical counterpart of GRB 000630
  27. IPN triangulation of GRB000630
  28. GRB 000623, optical observations
  29. GRB 000620, optical observations
  30. GRB000418, HST/STIS Observations
  31. GRB990123: Late-time HST/STIS observations of the host
  32. GRB 990506, HST/STIS Observations of the Host Galaxy
  33. GRB000623
  34. GRB 000620: J-band observations
  35. GRB990308, HST/STIS observations of the host galaxy
  36. IPN annulus for GRB000620
  37. GRB000615, Radio observations
  38. GRB000607, optical observations
  39. GRB 000615: NIR further observations
  40. BeppoSAX ALERT: GRB000620
  41. GRB000620: BeppoSAX Alert
  42. GRB990123, HST/STIS observations of the host galaxy
  43. GRB 000615, near-infrared observations
  44. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  45. GRB000616 [IPN Position]
  46. GRB000615B [IPN Position]
  47. GRB000615, further R-band photometry
  48. GRB 000615: NIR observations
  49. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  50. GRB000615, R-band photometry
  51. GRB980425, HST/STIS observations of the host galaxy
  52. GRB000615: BeppoSAX GRB Alert
  53. The Hosts of GRB 980703 and GRB 971214
  54. GRB 000301C: Further Late-Time HST/STIS observations
  55. GRB000528: follow-up X-ray measurements and update of IPN annulus
  56. GRB980519, HST/STIS observations of the host galaxy
  57. GRB000607, Radio Observations
  58. GRB000604 - Optical observations
  59. GRB000607, A SHORT, HARD BURST
  60. GRB000604, optical observations
  61. GRB000528, optical observations at ESO
  62. GRB 000604 optical observations
  63. GRB 000418: Detection of the Host Galaxy
  64. GRB000604, optical observations, comparison with DPOSS
  65. GRB000604 [IPN Position]
  66. X-ray Afterglow of GRB 000529
  67. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  68. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  69. IPN localization and time history of GRB000528
  70. New IPN localization of GRB000529
  71. GRB 000528 - WFC measurements
  72. GRB000528: BeppoSAX GRBM observations
  73. GRB 000528 Optical Observations
  74. GRB000519, BVRI field photometry
  75. IPN triangulation of GRB000519
  76. IPN triangulation of GRB000516
  77. Re: GRB000508B : Optical observations
  78. GRB 000418, Optical observation
  79. GRB000508B, optical photometry
  80. GRB000508B, BVR field photometry
  81. Possible GRB-related phenomenon
  82. RXTE/ASM and IPN localization of GRB 000508B
  83. GRB000424, UBVRI field photometry
  84. GRB 000424 Optical Observations
  85. GRB000418, UBVRI field photometry update
  86. The redshift of GRB 000418
  87. GRB 000429, optical observation
  88. GRB 000429, UBVRI field photometry
  89. IPN localization of GRB000429
  90. GRB 000418, UBVRI field photometry
  91. GRB000418, K'-band photometry
  92. GRB 000418, Optical Observation
  93. GRB 000418, optical observation
  94. GRB000424 Optical Observations
  95. GRB 000418, Optical Observation
  96. GRB 000424, Optical Observations
  97. GRB 000418, Optical Observation
  98. GRB000418, near-infrared observations
  99. Correction to IPN error box for GRB000419
  100. IPN error box for GRB000418

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Download all Circulars as a .tar.gz archive (updated once a day):
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