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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"

43604 results found.

  1. GRB000630, BVRI Field Photometry
  2. GRB000630, optical observations
  3. GRB000630, optical observations
  4. GRB000630: Optical observations
  5. GRB000630, Radio Observations
  6. possible optical counterpart of GRB 000630
  7. IPN triangulation of GRB000630
  8. GRB 000623, optical observations
  9. GRB 000620, optical observations
  10. GRB000418, HST/STIS Observations
  11. GRB990123: Late-time HST/STIS observations of the host
  12. GRB 990506, HST/STIS Observations of the Host Galaxy
  13. GRB000623
  14. GRB 000620: J-band observations
  15. GRB000620, optical observations
  16. GRB000615: H-band observations
  17. GRB990308, HST/STIS observations of the host galaxy
  18. GRB000620 Optical observations
  19. IPN annulus for GRB000620
  20. GRB000620: BeppoSAX WFC and GRBM detection
  21. GRB000615, Radio observations
  22. GRB000607, optical observations
  23. GRB 000615: NIR further observations
  24. GRB000620: refined BeppoSAX/WFC coordinates
  25. BeppoSAX ALERT: GRB000620
  26. GRB000620: BeppoSAX Alert
  27. GRB990123, HST/STIS observations of the host galaxy
  28. GRB000616 optical observations
  29. GRB 000615, near-infrared observations
  30. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  31. GRB000615, further R-band photometry
  32. GRB 000615: NIR observations
  33. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  34. GRB000615: BeppoSAX refined coordinates
  35. GRB980425, HST/STIS observations of the host galaxy
  36. GRB000615: BeppoSAX GRB Alert
  37. The Hosts of GRB 980703 and GRB 971214
  38. GRB 000301C: Further Late-Time HST/STIS observations
  39. GRB000528: follow-up X-ray measurements and update of IPN annulus
  40. Optical Follow-up of GRB000529 Error Box
  41. GRB980519, HST/STIS observations of the host galaxy
  42. GRB000607, Radio Observations
  43. BeppoSAX X-ray transient/possible GRB000608
  44. GRB000604 optical non-detection
  45. GRB000604 - Optical observations
  46. GRB000607, A SHORT, HARD BURST
  47. GRB000604, optical observations
  48. GRB000528, optical observations at ESO
  49. GRB 000604 optical observations
  50. GRB 000418: Detection of the Host Galaxy
  51. GRB000604, optical observations, comparison with DPOSS
  52. GRB000604 [IPN Position]
  53. GRB000528, Radio Observations
  54. X-ray Afterglow of GRB 000529
  55. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  56. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  57. GRB000529: Optical Observations
  58. IPN localization and time history of GRB000528
  59. New IPN localization of GRB000529
  60. GRB000519: Optical observations
  61. GRB000529: BeppoSAX WFC position
  62. GRB000528: BeppoSAX GRBM observations
  63. GRB 000528 Optical Observations
  64. GRB000519, BVRI field photometry
  65. IPN triangulation of GRB000519
  66. IPN triangulation of GRB000516
  67. Re: GRB000508B : Optical observations
  68. GRB 000418, Optical observation
  69. GRB000508B, optical photometry
  70. GRB000508B, BVR field photometry
  71. Possible GRB-related phenomenon
  72. RXTE/ASM and IPN localization of GRB 000508B
  73. GRB000424, UBVRI field photometry
  74. GRB 000424 Optical Observations
  75. GRB000418, UBVRI field photometry update
  76. The redshift of GRB 000418
  77. GRB000424, optical observations
  78. GRB 000429, optical observation
  79. GRB 000429, UBVRI field photometry
  80. IPN localization of GRB000429
  81. GRB 000418, UBVRI field photometry
  82. GRB000418, Radio detection
  83. GRB000418, K'-band photometry
  84. GRB 000418, Optical Observation
  85. GRB 000418, optical observation
  86. GRB000424 Optical Observations
  87. GRB 000418, Optical Observation
  88. GRB000424, optical observations
  89. GRB 000424, Optical Observations
  90. GRB 000418, Optical Observation
  91. GRB000418, near-infrared observations
  92. BeppoSAX GRB000424
  93. Correction to IPN error box for GRB000419
  94. IPN error box for GRB000418
  95. GRB000419 [IPN Position]
  96. GRB000416 Optical Observations
  97. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  98. GRB000416 BRJK observations
  99. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  100. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX

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