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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').

31205 results found.

  1. GRB 990510: Possible detection of a host galaxy
  2. GRB 990510 Host Galaxy Discovery
  3. GRB 000727, optical observations
  4. IPN localization of GRB000727
  5. GRB 990705, HST/STIS observations of the host galaxy
  6. GRB 990712: Late time HST/STIS Observations
  7. GRB 991216, HST/STIS observations
  8. GRB981226, HST/STIS observations of the host galaxy
  9. GRB 000630: Detection of the Optical Afterglow
  10. GRB000630, Revised BVRI Field Photometry
  11. GRB000630, Optical Observations
  12. GRB000630, optical observations
  13. GRB000630, BVRI Field Photometry
  14. GRB000630, optical observations
  15. GRB000630: Optical observations
  16. possible optical counterpart of GRB 000630
  17. IPN triangulation of GRB000630
  18. GRB 000623, optical observations
  19. GRB 000620, optical observations
  20. GRB000418, HST/STIS Observations
  21. GRB990123: Late-time HST/STIS observations of the host
  22. GRB 990506, HST/STIS Observations of the Host Galaxy
  23. GRB000623
  24. GRB 000620: J-band observations
  25. GRB990308, HST/STIS observations of the host galaxy
  26. IPN annulus for GRB000620
  27. GRB000615, Radio observations
  28. GRB000607, optical observations
  29. GRB 000615: NIR further observations
  30. BeppoSAX ALERT: GRB000620
  31. GRB000620: BeppoSAX Alert
  32. GRB990123, HST/STIS observations of the host galaxy
  33. GRB 000615, near-infrared observations
  34. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  35. GRB000616 [IPN Position]
  36. GRB000615B [IPN Position]
  37. GRB000615, further R-band photometry
  38. GRB 000615: NIR observations
  39. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  40. GRB000615, R-band photometry
  41. GRB980425, HST/STIS observations of the host galaxy
  42. GRB000615: BeppoSAX GRB Alert
  43. The Hosts of GRB 980703 and GRB 971214
  44. GRB 000301C: Further Late-Time HST/STIS observations
  45. GRB000528: follow-up X-ray measurements and update of IPN annulus
  46. GRB980519, HST/STIS observations of the host galaxy
  47. GRB000607, Radio Observations
  48. GRB000604 - Optical observations
  49. GRB000607, A SHORT, HARD BURST
  50. GRB000604, optical observations
  51. GRB000528, optical observations at ESO
  52. GRB 000604 optical observations
  53. GRB 000418: Detection of the Host Galaxy
  54. GRB000604, optical observations, comparison with DPOSS
  55. GRB000604 [IPN Position]
  56. X-ray Afterglow of GRB 000529
  57. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  58. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  59. IPN localization and time history of GRB000528
  60. New IPN localization of GRB000529
  61. GRB 000528 - WFC measurements
  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. GRB 000429, optical observation
  78. GRB 000429, UBVRI field photometry
  79. IPN localization of GRB000429
  80. GRB 000418, UBVRI field photometry
  81. GRB000418, K'-band photometry
  82. GRB 000418, Optical Observation
  83. GRB 000418, optical observation
  84. GRB000424 Optical Observations
  85. GRB 000418, Optical Observation
  86. GRB 000424, Optical Observations
  87. GRB 000418, Optical Observation
  88. GRB000418, near-infrared observations
  89. Correction to IPN error box for GRB000419
  90. IPN error box for GRB000418
  91. GRB000419 [IPN Position]
  92. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  93. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  94. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  95. Budget cuts in BeppoSAX operations: impact on GRB observations
  96. GRB 000408, optical observations
  97. Refined IPN error box for GRB000408
  98. GRB 991208, UBVRI field photometry
  99. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  100. GRB000408 [IPN Position]

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