Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

"N/A_MC170720_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"

10955 results found.

  1. GRB 010222 - WHT BVRI images
  2. GRB010629: Optical Observations
  3. SGR1900+14: High Fluence Burst Localized by HETE
  4. GRB010629: A Burst Localized by HETE
  5. SGR1900+14: Second Burst Localized by HETE
  6. SGR1900+14: A Burst Localized by HETE
  7. SGR1806-20: A Second, Intense Burst Localized by HETE
  8. SGR1806-20: Localization by HETE
  9. GRB010214, optical observations
  10. GRB Observation Report
  11. REVISED LOCATION OF GRB010326A
  12. GRB010326B: Localization by HETE (2nd GRB for this date)
  13. GRB010326: Refined Localization by HETE
  14. GRB010326: Localization by HETE
  15. Optical Observations of GRB 010324
  16. GRB 010222 - HEGRA GeV/TeV Observations
  17. GRB010222, possible increase of optical decay slope
  18. GRB 010220: Near-IR Observations
  19. GRB 010222: Near-IR Observations
  20. GRB010214, candidate optical afterglow
  21. GRB010214, optical observations
  22. J-Band Observation of GRB 010214.
  23. Possible InfraRed Transient of GRB 010214.
  24. GRB010214 Optical Observation
  25. GRB010213 detected by HETE
  26. GRB010126, TNG R-band observations
  27. Optical Observations of GRB 001018 at Keck
  28. H band observation of GRB 001212
  29. GRB 001109: deep JHK upper limits
  30. CORRECTION to XMM-Newton observation of GRB001025
  31. XMM-Newton observation of GRB001025
  32. V,R,I band observations of GRB000926
  33. The Likely Optical/Infrared Afterglow of GRB 001011
  34. Public availability of BeppoSAX data of GRB000926
  35. GRB000926: X-ray afterglow by BeppoSAX: revised fluxes (fwd)
  36. GRB 000926, Optical Decay
  37. GRB 000926, Optical Observations
  38. J and K band observations of GRB 000926
  39. GRB 000926, Optical Observation
  40. Optical candidate for GRB000926
  41. GRB000830, TNG B-band observations
  42. GRB000210, Optical observations
  43. Chandra Position of GRB000210
  44. GRB000812, TNG R-band observations
  45. GRB000801, VLT-Antu R-band observations
  46. GRB000630, optical observations
  47. GRB000418, HST/STIS Observations
  48. GRB000620, optical observations
  49. GRB000615: H-band observations
  50. GRB000620 Optical observations
  51. GRB000607, optical observations
  52. GRB000616 optical observations
  53. GRB 000615: NIR observations
  54. Optical Follow-up of GRB000529 Error Box
  55. GRB000528, optical observations at ESO
  56. Re: GRB000508B : Optical observations
  57. GRB 000424 Optical Observations
  58. GRB 000418, Optical Observation
  59. GRB000424 Optical Observations
  60. GRB 000418, Optical Observation
  61. GRB 000418, Optical Observation
  62. BeppoSAX GRB000424
  63. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  64. GRB 000301C: Optical Spectrum and Redshift
  65. GRB 000301C: Optical Spectrum and Redshift
  66. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  67. GRB000301C, optical R-band observations
  68. GRB 000301C: K' Observations
  69. GRB000301C - Host galaxy not detected in R (?)
  70. GRB 000301c near-IR observations
  71. GRB 000301C, Optical Color
  72. GRB 000301C, Optical Observation
  73. GRB 000301C, Optical Observation
  74. GRB 000115 Optical observations
  75. GRB 000115 Optical observations
  76. GRB 991216: J band spectrophotometry
  77. GRB991217/SAX J2303.2+0015, optical observations
  78. Chandra observation of the X-ray afterglow of GRB991216
  79. GRB 991208 Keck Spectroscopy
  80. GRB 991208 Infrared Detection
  81. GRB 991216: Comparison with DPOSS images
  82. R-band Observations of GRB991208 at TNG
  83. GRB991208, optical observations
  84. Optical Observations of GRB991105
  85. GRB991106, optical observation at SAO-RAS
  86. Revised BeppoSAX WFC position of GRB991105
  87. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  88. GRB 991014, radio observations
  89. GRB 991014, Optical Observations
  90. Optical Observations of GRB990907
  91. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  92. GRB990806 BeppoSAX follow up
  93. GRB 990806, Optical Observations
  94. GRB 990806, optical observations
  95. GRB 990806, Optical Observations
  96. GRB990806 UBVRIJHK observations
  97. BeppoSAX ALERT GRB990806: Summer GRB
  98. VLT spectrum of GRB990712
  99. Updated Astrometry for the IR Counterpart of GRB990705
  100. Infrared and Optical Observations of GRB990705

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