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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"

38339 results found.

  1. False GRB alarm from RXTE/ASM on 8 Sept 2000
  2. GRB 000830: Optical observations
  3. GRB000830: Optical observations
  4. GRB000830, TNG B-band observations
  5. GRB000830, BVRI field photometry
  6. GRB000830: Optical observations
  7. GRB000210, Optical observations
  8. Chandra Position of GRB000210
  9. "Snapshot" afterglow IDs and GRB 000830
  10. IPN triangulation of GRB000830
  11. HST/STIS observations of the host galaxy of GRB 980329
  12. HST/STIS observations of the chaotic environment of GRB 980613
  13. IPN localization of GRB000820
  14. GRB000812, TNG R-band observations
  15. GRB000801 & GRB000730, Gamma Ray Observations
  16. GRB000730, Gamma Ray Observations
  17. GRB000812, Radio observations
  18. IPN localization of GRB000812
  19. IPN localization of GRB000811
  20. GRB000801, Gamma Ray Observations
  21. GRB000801, VLT-Antu R-band observations
  22. GRB 991208 Host Galaxy Imaging
  23. Updated IPN coordinates for GRB000801
  24. IPN localization of GRB000801
  25. IPN localization of GRB000730B
  26. IPN localization of GRB000730B
  27. IPN localization of GRB000730
  28. GRB 990510: Possible detection of a host galaxy
  29. GRB 990510 Host Galaxy Discovery
  30. GRB 000727, optical observations
  31. IPN localization of GRB000727
  32. GRB 990705, HST/STIS observations of the host galaxy
  33. GRB 990712: Late time HST/STIS Observations
  34. GRB 991216, HST/STIS observations
  35. GRB981226, HST/STIS observations of the host galaxy
  36. GRB 000630: Detection of the Optical Afterglow
  37. GRB000630, Revised BVRI Field Photometry
  38. GRB000630, Optical Observations
  39. GRB000630, optical observations
  40. GRB000630, BVRI Field Photometry
  41. GRB000630, optical observations
  42. GRB000630: Optical observations
  43. possible optical counterpart of GRB 000630
  44. IPN triangulation of GRB000630
  45. GRB 000623, optical observations
  46. GRB 000620, optical observations
  47. GRB000418, HST/STIS Observations
  48. GRB990123: Late-time HST/STIS observations of the host
  49. GRB 990506, HST/STIS Observations of the Host Galaxy
  50. GRB000623
  51. GRB 000620: J-band observations
  52. GRB990308, HST/STIS observations of the host galaxy
  53. IPN annulus for GRB000620
  54. GRB000615, Radio observations
  55. GRB000607, optical observations
  56. GRB 000615: NIR further observations
  57. BeppoSAX ALERT: GRB000620
  58. GRB000620: BeppoSAX Alert
  59. GRB990123, HST/STIS observations of the host galaxy
  60. GRB 000615, near-infrared observations
  61. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  62. GRB000616 [IPN Position]
  63. GRB000615B [IPN Position]
  64. GRB000615, further R-band photometry
  65. GRB 000615: NIR observations
  66. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  67. GRB000615, R-band photometry
  68. GRB980425, HST/STIS observations of the host galaxy
  69. GRB000615: BeppoSAX GRB Alert
  70. The Hosts of GRB 980703 and GRB 971214
  71. GRB 000301C: Further Late-Time HST/STIS observations
  72. GRB000528: follow-up X-ray measurements and update of IPN annulus
  73. GRB980519, HST/STIS observations of the host galaxy
  74. GRB000607, Radio Observations
  75. GRB000604 - Optical observations
  76. GRB000607, A SHORT, HARD BURST
  77. GRB000604, optical observations
  78. GRB000528, optical observations at ESO
  79. GRB 000604 optical observations
  80. GRB 000418: Detection of the Host Galaxy
  81. GRB000604, optical observations, comparison with DPOSS
  82. GRB000604 [IPN Position]
  83. X-ray Afterglow of GRB 000529
  84. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  85. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  86. IPN localization and time history of GRB000528
  87. New IPN localization of GRB000529
  88. GRB 000528 - WFC measurements
  89. GRB000528: BeppoSAX GRBM observations
  90. GRB 000528 Optical Observations
  91. GRB000519, BVRI field photometry
  92. IPN triangulation of GRB000519
  93. IPN triangulation of GRB000516
  94. Re: GRB000508B : Optical observations
  95. GRB 000418, Optical observation
  96. GRB000508B, optical photometry
  97. GRB000508B, BVR field photometry
  98. Possible GRB-related phenomenon
  99. RXTE/ASM and IPN localization of GRB 000508B
  100. GRB000424, UBVRI field photometry

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