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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"

35436 results found.

  1. IPN triangulation of GRB000925
  2. IPN triangulation of GRB000911
  3. IPN triangulation of GRB000910
  4. False GRB alarm from RXTE/ASM on 8 Sept 2000
  5. GRB 000830: Optical observations
  6. GRB000830: Optical observations
  7. GRB000830, TNG B-band observations
  8. GRB000830, BVRI field photometry
  9. GRB000830: Optical observations
  10. GRB000210, Optical observations
  11. Chandra Position of GRB000210
  12. "Snapshot" afterglow IDs and GRB 000830
  13. IPN triangulation of GRB000830
  14. HST/STIS observations of the host galaxy of GRB 980329
  15. HST/STIS observations of the chaotic environment of GRB 980613
  16. IPN localization of GRB000820
  17. GRB000801 & GRB000730, Gamma Ray Observations
  18. GRB000730, Gamma Ray Observations
  19. GRB000812, Radio observations
  20. IPN localization of GRB000812
  21. IPN localization of GRB000811
  22. GRB000801, Gamma Ray Observations
  23. GRB000801, VLT-Antu R-band observations
  24. GRB 991208 Host Galaxy Imaging
  25. Updated IPN coordinates for GRB000801
  26. IPN localization of GRB000801
  27. IPN localization of GRB000730B
  28. IPN localization of GRB000730B
  29. IPN localization of GRB000730
  30. GRB 990510: Possible detection of a host galaxy
  31. GRB 990510 Host Galaxy Discovery
  32. GRB 000727, optical observations
  33. IPN localization of GRB000727
  34. GRB 990705, HST/STIS observations of the host galaxy
  35. GRB 990712: Late time HST/STIS Observations
  36. GRB 991216, HST/STIS observations
  37. GRB981226, HST/STIS observations of the host galaxy
  38. GRB 000630: Detection of the Optical Afterglow
  39. GRB000630, Revised BVRI Field Photometry
  40. GRB000630, Optical Observations
  41. GRB000630, optical observations
  42. GRB000630, BVRI Field Photometry
  43. GRB000630, optical observations
  44. GRB000630: Optical observations
  45. possible optical counterpart of GRB 000630
  46. IPN triangulation of GRB000630
  47. GRB 000623, optical observations
  48. GRB 000620, optical observations
  49. GRB000418, HST/STIS Observations
  50. GRB990123: Late-time HST/STIS observations of the host
  51. GRB 990506, HST/STIS Observations of the Host Galaxy
  52. GRB000623
  53. GRB 000620: J-band observations
  54. GRB990308, HST/STIS observations of the host galaxy
  55. IPN annulus for GRB000620
  56. GRB000615, Radio observations
  57. GRB000607, optical observations
  58. GRB 000615: NIR further observations
  59. BeppoSAX ALERT: GRB000620
  60. GRB000620: BeppoSAX Alert
  61. GRB990123, HST/STIS observations of the host galaxy
  62. GRB 000615, near-infrared observations
  63. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  64. GRB000616 [IPN Position]
  65. GRB000615B [IPN Position]
  66. GRB000615, further R-band photometry
  67. GRB 000615: NIR observations
  68. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  69. GRB000615, R-band photometry
  70. GRB980425, HST/STIS observations of the host galaxy
  71. GRB000615: BeppoSAX GRB Alert
  72. The Hosts of GRB 980703 and GRB 971214
  73. GRB 000301C: Further Late-Time HST/STIS observations
  74. GRB000528: follow-up X-ray measurements and update of IPN annulus
  75. GRB980519, HST/STIS observations of the host galaxy
  76. GRB000607, Radio Observations
  77. GRB000604 - Optical observations
  78. GRB000607, A SHORT, HARD BURST
  79. GRB000604, optical observations
  80. GRB000528, optical observations at ESO
  81. GRB 000604 optical observations
  82. GRB 000418: Detection of the Host Galaxy
  83. GRB000604, optical observations, comparison with DPOSS
  84. GRB000604 [IPN Position]
  85. X-ray Afterglow of GRB 000529
  86. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  87. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  88. IPN localization and time history of GRB000528
  89. New IPN localization of GRB000529
  90. GRB 000528 - WFC measurements
  91. GRB000528: BeppoSAX GRBM observations
  92. GRB 000528 Optical Observations
  93. GRB000519, BVRI field photometry
  94. IPN triangulation of GRB000519
  95. IPN triangulation of GRB000516
  96. Re: GRB000508B : Optical observations
  97. GRB 000418, Optical observation
  98. GRB000508B, optical photometry
  99. GRB000508B, BVR field photometry
  100. Possible GRB-related phenomenon

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