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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.

"N/A_MC170208_R1" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

10922 results found.

  1. Public availability of BeppoSAX data of GRB000926
  2. GRB000926: X-ray afterglow by BeppoSAX: revised fluxes (fwd)
  3. GRB 000926, Optical Decay
  4. GRB 000926, Optical Observations
  5. J and K band observations of GRB 000926
  6. GRB 000926, Optical Observation
  7. Optical candidate for GRB000926
  8. GRB000830, TNG B-band observations
  9. GRB000210, Optical observations
  10. Chandra Position of GRB000210
  11. GRB000812, TNG R-band observations
  12. GRB000801, VLT-Antu R-band observations
  13. GRB000630, optical observations
  14. GRB000418, HST/STIS Observations
  15. GRB000620, optical observations
  16. GRB000615: H-band observations
  17. GRB000620 Optical observations
  18. GRB000607, optical observations
  19. GRB000616 optical observations
  20. GRB 000615: NIR observations
  21. Optical Follow-up of GRB000529 Error Box
  22. GRB000528, optical observations at ESO
  23. Re: GRB000508B : Optical observations
  24. GRB 000424 Optical Observations
  25. GRB 000418, Optical Observation
  26. GRB000424 Optical Observations
  27. GRB 000418, Optical Observation
  28. GRB 000418, Optical Observation
  29. BeppoSAX GRB000424
  30. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  31. GRB 000301C: Optical Spectrum and Redshift
  32. GRB 000301C: Optical Spectrum and Redshift
  33. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  34. GRB000301C, optical R-band observations
  35. GRB 000301C: K' Observations
  36. GRB000301C - Host galaxy not detected in R (?)
  37. GRB 000301c near-IR observations
  38. GRB 000301C, Optical Color
  39. GRB 000301C, Optical Observation
  40. GRB 000301C, Optical Observation
  41. GRB 000115 Optical observations
  42. GRB 000115 Optical observations
  43. GRB 991216: J band spectrophotometry
  44. GRB991217/SAX J2303.2+0015, optical observations
  45. Chandra observation of the X-ray afterglow of GRB991216
  46. GRB 991208 Keck Spectroscopy
  47. GRB 991208 Infrared Detection
  48. GRB 991216: Comparison with DPOSS images
  49. R-band Observations of GRB991208 at TNG
  50. GRB991208, optical observations
  51. Optical Observations of GRB991105
  52. GRB991106, optical observation at SAO-RAS
  53. Revised BeppoSAX WFC position of GRB991105
  54. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  55. GRB 991014, radio observations
  56. GRB 991014, Optical Observations
  57. Optical Observations of GRB990907
  58. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  59. GRB990806 BeppoSAX follow up
  60. GRB 990806, Optical Observations
  61. GRB 990806, optical observations
  62. GRB 990806, Optical Observations
  63. GRB990806 UBVRIJHK observations
  64. BeppoSAX ALERT GRB990806: Summer GRB
  65. VLT spectrum of GRB990712
  66. Updated Astrometry for the IR Counterpart of GRB990705
  67. Infrared and Optical Observations of GRB990705
  68. GRB990704 radio and optical observations
  69. GRB 990704 X-ray Observations
  70. GRB990705: Intriguing Positional Coincidences
  71. Optical Observations of GRB990627
  72. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  73. GRB 990506 optical observation
  74. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  75. BeppoSAX: A new fast X-ray transient
  76. GRB 990506 R band observations
  77. VLT spectrum of GRB990510
  78. GRB 990510: Broad Band Break
  79. GRB 990510: BeppoSAX/GRBM observations
  80. GRB990510 optical observations
  81. GRB 990510 optical observations
  82. GRB990510: NFI X-ray source
  83. GRB 990506 optical observations
  84. GRB 990316, Optical observations
  85. GRB990217: BeppoSAX/GRBM data
  86. Optical Observations of GRB990217
  87. GRB 990123: Discovery of the Probable Host Galaxy
  88. GRB 990123: New Constraints on Possible Foreground Galaxies
  89. GRB990123, Optical BVRI Observations
  90. GRB990123, ASCA X-ray observation of afterglow
  91. GRB 990123 Spectroscopic Redshifts
  92. GRB 990123 Optical Follow-Up
  93. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  94. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  95. GRB981220, Correction to GCN 179
  96. GRB981220 B, R and I band observations
  97. GRB 981220 optical R and I observations
  98. GRB 981226 - Infrared Observations
  99. GRB 981226 optical observations
  100. BeppoSAX NFI Observation of GRB980425

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