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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_MC161202_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"

10927 results found.

  1. GRB 001109: deep JHK upper limits
  2. CORRECTION to XMM-Newton observation of GRB001025
  3. XMM-Newton observation of GRB001025
  4. V,R,I band observations of GRB000926
  5. The Likely Optical/Infrared Afterglow of GRB 001011
  6. Public availability of BeppoSAX data of GRB000926
  7. GRB000926: X-ray afterglow by BeppoSAX: revised fluxes (fwd)
  8. GRB 000926, Optical Decay
  9. GRB 000926, Optical Observations
  10. J and K band observations of GRB 000926
  11. GRB 000926, Optical Observation
  12. Optical candidate for GRB000926
  13. GRB000830, TNG B-band observations
  14. GRB000210, Optical observations
  15. Chandra Position of GRB000210
  16. GRB000812, TNG R-band observations
  17. GRB000801, VLT-Antu R-band observations
  18. GRB000630, optical observations
  19. GRB000418, HST/STIS Observations
  20. GRB000620, optical observations
  21. GRB000615: H-band observations
  22. GRB000620 Optical observations
  23. GRB000607, optical observations
  24. GRB000616 optical observations
  25. GRB 000615: NIR observations
  26. Optical Follow-up of GRB000529 Error Box
  27. GRB000528, optical observations at ESO
  28. Re: GRB000508B : Optical observations
  29. GRB 000424 Optical Observations
  30. GRB 000418, Optical Observation
  31. GRB000424 Optical Observations
  32. GRB 000418, Optical Observation
  33. GRB 000418, Optical Observation
  34. BeppoSAX GRB000424
  35. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  36. GRB 000301C: Optical Spectrum and Redshift
  37. GRB 000301C: Optical Spectrum and Redshift
  38. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  39. GRB000301C, optical R-band observations
  40. GRB 000301C: K' Observations
  41. GRB000301C - Host galaxy not detected in R (?)
  42. GRB 000301c near-IR observations
  43. GRB 000301C, Optical Color
  44. GRB 000301C, Optical Observation
  45. GRB 000301C, Optical Observation
  46. GRB 000115 Optical observations
  47. GRB 000115 Optical observations
  48. GRB 991216: J band spectrophotometry
  49. GRB991217/SAX J2303.2+0015, optical observations
  50. Chandra observation of the X-ray afterglow of GRB991216
  51. GRB 991208 Keck Spectroscopy
  52. GRB 991208 Infrared Detection
  53. GRB 991216: Comparison with DPOSS images
  54. R-band Observations of GRB991208 at TNG
  55. GRB991208, optical observations
  56. Optical Observations of GRB991105
  57. GRB991106, optical observation at SAO-RAS
  58. Revised BeppoSAX WFC position of GRB991105
  59. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  60. GRB 991014, radio observations
  61. GRB 991014, Optical Observations
  62. Optical Observations of GRB990907
  63. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  64. GRB990806 BeppoSAX follow up
  65. GRB 990806, Optical Observations
  66. GRB 990806, optical observations
  67. GRB 990806, Optical Observations
  68. GRB990806 UBVRIJHK observations
  69. BeppoSAX ALERT GRB990806: Summer GRB
  70. VLT spectrum of GRB990712
  71. Updated Astrometry for the IR Counterpart of GRB990705
  72. Infrared and Optical Observations of GRB990705
  73. GRB990704 radio and optical observations
  74. GRB 990704 X-ray Observations
  75. GRB990705: Intriguing Positional Coincidences
  76. Optical Observations of GRB990627
  77. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  78. GRB 990506 optical observation
  79. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  80. BeppoSAX: A new fast X-ray transient
  81. GRB 990506 R band observations
  82. VLT spectrum of GRB990510
  83. GRB 990510: Broad Band Break
  84. GRB 990510: BeppoSAX/GRBM observations
  85. GRB990510 optical observations
  86. GRB 990510 optical observations
  87. GRB990510: NFI X-ray source
  88. GRB 990506 optical observations
  89. GRB 990316, Optical observations
  90. GRB990217: BeppoSAX/GRBM data
  91. Optical Observations of GRB990217
  92. GRB 990123: Discovery of the Probable Host Galaxy
  93. GRB 990123: New Constraints on Possible Foreground Galaxies
  94. GRB990123, Optical BVRI Observations
  95. GRB990123, ASCA X-ray observation of afterglow
  96. GRB 990123 Spectroscopic Redshifts
  97. GRB 990123 Optical Follow-Up
  98. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  99. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  100. GRB981220, Correction to GCN 179

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