Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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.

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"

43961 results found.

  1. GRB 171115A: RATIR Optical and NIR Observations
  2. GRB 171115A: Swift-BAT refined analysis
  3. GRB 171115A: Swift-XRT refined Analysis
  4. GRB 171115A: Enhanced Swift-XRT position
  5. GRB 171115A: Swift detection of a burst
  6. GRB 171112A: Fermi GBM Detection
  7. LIGO/Virgo G288732/GW170608: updated localization from parameter estimation
  8. Konus-Wind observation of GRB 171112A
  9. FACT follow-up of IceCube20171106
  10. Konus-Wind observation of GRB 171108A
  11. GRB 171112A: MAXI/GSC detection
  12. IPN Triangulation of GRB 171108A (short)
  13. GRB 171103A: Insight-HXMT observation
  14. IceCube-171106A: Swift Observations
  15. HAWC follow-up of IceCube-171106A
  16. GRB 171010A: afterglow and SN 2017htp optical observations
  17. GRB 171108A: Fermi GBM detection
  18. GRB 171102A CALET Gamma-Ray Burst Monitor detection
  19. GRB 171101A CALET Gamma-Ray Burst Monitor detection
  20. INTEGRAL observation of IceCube-171106A
  21. GRB 171030A: MASTER OT J034412.48-263556.5 featureless continuum spectrum from Lijiang 2.4m (China) telescope and 2m the Himalayan Chandra
  22. GRB 171010A: possible SN component
  23. Fermi-GBM Trigger 531686417 / 171106778 is not related to ICECUBE-171106A
  24. IceCube-171106A - IceCube observation of a high-energy neutrino candidate
  25. AMON ICECUBE EHE 130214 (close by time to Fermi trigger): MASTER early follow-up observations
  26. GRB 171103A: AstroSat CZTI detection
  27. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  28. Konus-Wind observation of GRB 171103A (short/hard)
  29. GRB 171103A: Fermi GBM observation
  30. GRB 171103A: Swift-BAT refined analysis of a short GRB
  31. LIGO/Virgo G298936: NOT spectroscopy of GWFUNC-17ure
  32. Fermi GBM detections of Swift J0243.6+6124 and modification of the GBM trigger configuration
  33. GRB 171010A: VLT spectroscopic identification of the associated SN 2017htp
  34. GRB 171103A: Swift detection of a short hard burst
  35. Konus-Wind observation of GRB 171102A
  36. GRB 171102B: AbAO optical upper limit
  37. GRB 171102B: TShAO optical upper limit
  38. IPN Triangulation of GRB 171102A
  39. GRB 171102B: RATIR Optical and NIR Observations
  40. GRB 171102B: Swift-BAT refined analysis
  41. GRB 171102B: Swift-XRT refined Analysis
  42. GRB 171102B: Enhanced Swift-XRT position
  43. GRB 171102A: Fermi GBM detection
  44. GRB 171102B: Swift detection of a burst
  45. GRB 171102A: Fermi-LAT detection
  46. GRB 171030A: IPN error box through NSs probability merging rate map
  47. GRB 171030A: Fermi GBM detection
  48. GRB 171030A: Swift non-localization with BAT, XRT and UVOT
  49. GRB 171030A: Swift ToO observations
  50. IPN Triangulation of GRB 171030A (short)
  51. GRB 171022A: Fermi-LAT detection retraction
  52. Konus-Wind observation of GRB 171027A
  53. AMI-LA observations of the new Be X-ray binary Swift J0243.6+6124
  54. Swift Trigger 783893: LCO 1-m telescope observations
  55. Swift Trigger 783893 is probably not a GRB
  56. GRB 171027A, Swift-BAT refined analysis
  57. Retraction of high energy neutrino candidate IceCube-171028
  58. GRB 171027A: Swift-XRT refined Analysis
  59. GRB 171027A: Enhanced Swift-XRT position
  60. GRB 171027A: RATIR Confirmation of Fading and Photo-z
  61. GRB 171027A: VLT optical upper limits
  62. GRB 171027A: LCO 1-m telescope observations
  63. GROND observations of GRB 171027A: correction
  64. GRB 171027A: RATIR Detection of a NIR Afterglow Candidate
  65. GROND observations of GRB 171027A
  66. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  67. GRB 171027A: Prompt enhanced Swift-XRT position
  68. GRB 171027A: Swift detection of a burst
  69. Konus-Wind observation of GRB 171022A
  70. IPN Triangulation of GRB 171022A
  71. GRB 171013B CALET Gamma-Ray Burst Monitor detection
  72. Fermi GBM trigger 530617076/171025401 is not a GRB
  73. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  74. Numerous Fermi-GBM Subthreshold Notices are due to Swift J0243.6+6
  75. GRB 171022A: Fermi GBM detection
  76. GRB 171022A: Fermi-LAT detection
  77. Swift Trigger 781740 is not a burst
  78. Fermi GBM Observations of IceCube-171015A
  79. GRB 171020A: Continued RATIR Optical and NIR Observation
  80. GRB 171020A: TAROT Calern observatory optical observations
  81. GRB 171020A: NOT spectroscopic redshift
  82. GRB 171020A: Swift-BAT refined analysis
  83. GRB 171020A: RATIR Optical and NIR Observations
  84. GRB 171020A: Swift-XRT refined Analysis
  85. GRB 171020A: Enhanced Swift-XRT position
  86. GRB 171020A: LT observations
  87. GRB 171020A: Correction of alpha in GCN 22031
  88. GRB 171020A: Confirmation of OT fading
  89. GRB 171020A: NOT optical afterglow detection
  90. GRB 171020A: Swift detection of a burst
  91. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  92. GRB 171011B: Insight-HXMT detection
  93. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  94. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  95. GRB 171010B: Swift-XRT afterglow detection
  96. GRB 171011B CALET Gamma-Ray Burst Monitor detection
  97. Trigger 779762: Swift detection of Vela X-1
  98. Trigger 779351: Swift detection of Swift J0243.6+6124
  99. Search for counterpart to IceCube-171015A with ANTARES
  100. INTEGRAL SPI-ACS observation of IceCube-171015A

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