Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

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_MC151116_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"

10919 results found.

  1. GRB 000926, Optical Observations
  2. J and K band observations of GRB 000926
  3. GRB 000926, Optical Observation
  4. Optical candidate for GRB000926
  5. GRB000830, TNG B-band observations
  6. GRB000210, Optical observations
  7. Chandra Position of GRB000210
  8. GRB000812, TNG R-band observations
  9. GRB000801, VLT-Antu R-band observations
  10. GRB000630, optical observations
  11. GRB000418, HST/STIS Observations
  12. GRB000620, optical observations
  13. GRB000615: H-band observations
  14. GRB000620 Optical observations
  15. GRB000607, optical observations
  16. GRB000616 optical observations
  17. GRB 000615: NIR observations
  18. Optical Follow-up of GRB000529 Error Box
  19. GRB000528, optical observations at ESO
  20. Re: GRB000508B : Optical observations
  21. GRB 000424 Optical Observations
  22. GRB 000418, Optical Observation
  23. GRB000424 Optical Observations
  24. GRB 000418, Optical Observation
  25. GRB 000418, Optical Observation
  26. BeppoSAX GRB000424
  27. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  28. GRB 000301C: Optical Spectrum and Redshift
  29. GRB 000301C: Optical Spectrum and Redshift
  30. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  31. GRB000301C, optical R-band observations
  32. GRB 000301C: K' Observations
  33. GRB000301C - Host galaxy not detected in R (?)
  34. GRB 000301c near-IR observations
  35. GRB 000301C, Optical Color
  36. GRB 000301C, Optical Observation
  37. GRB 000301C, Optical Observation
  38. GRB 000115 Optical observations
  39. GRB 000115 Optical observations
  40. GRB 991216: J band spectrophotometry
  41. GRB991217/SAX J2303.2+0015, optical observations
  42. Chandra observation of the X-ray afterglow of GRB991216
  43. GRB 991208 Keck Spectroscopy
  44. GRB 991208 Infrared Detection
  45. GRB 991216: Comparison with DPOSS images
  46. R-band Observations of GRB991208 at TNG
  47. GRB991208, optical observations
  48. Optical Observations of GRB991105
  49. GRB991106, optical observation at SAO-RAS
  50. Revised BeppoSAX WFC position of GRB991105
  51. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  52. GRB 991014, radio observations
  53. GRB 991014, Optical Observations
  54. Optical Observations of GRB990907
  55. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  56. GRB990806 BeppoSAX follow up
  57. GRB 990806, Optical Observations
  58. GRB 990806, optical observations
  59. GRB 990806, Optical Observations
  60. GRB990806 UBVRIJHK observations
  61. BeppoSAX ALERT GRB990806: Summer GRB
  62. VLT spectrum of GRB990712
  63. Updated Astrometry for the IR Counterpart of GRB990705
  64. Infrared and Optical Observations of GRB990705
  65. GRB990704 radio and optical observations
  66. GRB 990704 X-ray Observations
  67. GRB990705: Intriguing Positional Coincidences
  68. Optical Observations of GRB990627
  69. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  70. GRB 990506 optical observation
  71. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  72. BeppoSAX: A new fast X-ray transient
  73. GRB 990506 R band observations
  74. VLT spectrum of GRB990510
  75. GRB 990510: Broad Band Break
  76. GRB 990510: BeppoSAX/GRBM observations
  77. GRB990510 optical observations
  78. GRB 990510 optical observations
  79. GRB990510: NFI X-ray source
  80. GRB 990506 optical observations
  81. GRB 990316, Optical observations
  82. GRB990217: BeppoSAX/GRBM data
  83. Optical Observations of GRB990217
  84. GRB 990123: Discovery of the Probable Host Galaxy
  85. GRB 990123: New Constraints on Possible Foreground Galaxies
  86. GRB990123, Optical BVRI Observations
  87. GRB990123, ASCA X-ray observation of afterglow
  88. GRB 990123 Spectroscopic Redshifts
  89. GRB 990123 Optical Follow-Up
  90. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  91. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  92. GRB981220, Correction to GCN 179
  93. GRB981220 B, R and I band observations
  94. GRB 981220 optical R and I observations
  95. GRB 981226 - Infrared Observations
  96. GRB 981226 optical observations
  97. BeppoSAX NFI Observation of GRB980425
  98. GRB980425 Optical Follow-up
  99. GRB980703: LOTIS observation at early times
  100. GRB 980703

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov