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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"

36135 results found.

  1. IPN triangulation of GRB000911
  2. IPN triangulation of GRB000910
  3. False GRB alarm from RXTE/ASM on 8 Sept 2000
  4. GRB 000830: Optical observations
  5. GRB000830: Optical observations
  6. GRB000830, TNG B-band observations
  7. GRB000830, BVRI field photometry
  8. GRB000830: Optical observations
  9. GRB000210, Optical observations
  10. Chandra Position of GRB000210
  11. "Snapshot" afterglow IDs and GRB 000830
  12. IPN triangulation of GRB000830
  13. HST/STIS observations of the host galaxy of GRB 980329
  14. HST/STIS observations of the chaotic environment of GRB 980613
  15. IPN localization of GRB000820
  16. GRB000801 & GRB000730, Gamma Ray Observations
  17. GRB000730, Gamma Ray Observations
  18. GRB000812, Radio observations
  19. IPN localization of GRB000812
  20. IPN localization of GRB000811
  21. GRB000801, Gamma Ray Observations
  22. GRB000801, VLT-Antu R-band observations
  23. GRB 991208 Host Galaxy Imaging
  24. Updated IPN coordinates for GRB000801
  25. IPN localization of GRB000801
  26. IPN localization of GRB000730B
  27. IPN localization of GRB000730B
  28. IPN localization of GRB000730
  29. GRB 990510: Possible detection of a host galaxy
  30. GRB 990510 Host Galaxy Discovery
  31. GRB 000727, optical observations
  32. IPN localization of GRB000727
  33. GRB 990705, HST/STIS observations of the host galaxy
  34. GRB 990712: Late time HST/STIS Observations
  35. GRB 991216, HST/STIS observations
  36. GRB981226, HST/STIS observations of the host galaxy
  37. GRB 000630: Detection of the Optical Afterglow
  38. GRB000630, Revised BVRI Field Photometry
  39. GRB000630, Optical Observations
  40. GRB000630, optical observations
  41. GRB000630, BVRI Field Photometry
  42. GRB000630, optical observations
  43. GRB000630: Optical observations
  44. possible optical counterpart of GRB 000630
  45. IPN triangulation of GRB000630
  46. GRB 000623, optical observations
  47. GRB 000620, optical observations
  48. GRB000418, HST/STIS Observations
  49. GRB990123: Late-time HST/STIS observations of the host
  50. GRB 990506, HST/STIS Observations of the Host Galaxy
  51. GRB000623
  52. GRB 000620: J-band observations
  53. GRB990308, HST/STIS observations of the host galaxy
  54. IPN annulus for GRB000620
  55. GRB000615, Radio observations
  56. GRB000607, optical observations
  57. GRB 000615: NIR further observations
  58. BeppoSAX ALERT: GRB000620
  59. GRB000620: BeppoSAX Alert
  60. GRB990123, HST/STIS observations of the host galaxy
  61. GRB 000615, near-infrared observations
  62. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  63. GRB000616 [IPN Position]
  64. GRB000615B [IPN Position]
  65. GRB000615, further R-band photometry
  66. GRB 000615: NIR observations
  67. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  68. GRB000615, R-band photometry
  69. GRB980425, HST/STIS observations of the host galaxy
  70. GRB000615: BeppoSAX GRB Alert
  71. The Hosts of GRB 980703 and GRB 971214
  72. GRB 000301C: Further Late-Time HST/STIS observations
  73. GRB000528: follow-up X-ray measurements and update of IPN annulus
  74. GRB980519, HST/STIS observations of the host galaxy
  75. GRB000607, Radio Observations
  76. GRB000604 - Optical observations
  77. GRB000607, A SHORT, HARD BURST
  78. GRB000604, optical observations
  79. GRB000528, optical observations at ESO
  80. GRB 000604 optical observations
  81. GRB 000418: Detection of the Host Galaxy
  82. GRB000604, optical observations, comparison with DPOSS
  83. GRB000604 [IPN Position]
  84. X-ray Afterglow of GRB 000529
  85. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  86. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  87. IPN localization and time history of GRB000528
  88. New IPN localization of GRB000529
  89. GRB 000528 - WFC measurements
  90. GRB000528: BeppoSAX GRBM observations
  91. GRB 000528 Optical Observations
  92. GRB000519, BVRI field photometry
  93. IPN triangulation of GRB000519
  94. IPN triangulation of GRB000516
  95. Re: GRB000508B : Optical observations
  96. GRB 000418, Optical observation
  97. GRB000508B, optical photometry
  98. GRB000508B, BVR field photometry
  99. Possible GRB-related phenomenon
  100. RXTE/ASM and IPN localization of GRB 000508B

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