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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"

43959 results found.

  1. GRB 171010A: VLA Observations
  2. GRB 171010A: VLA Detection
  3. GRB 171010A: A detection of a radio source by AMI
  4. GRB 171010A : Optical observations from HCT
  5. GRB 171010A: RATIR Optical and NIR Observations
  6. BAT trigger 778435 is not a GRB.
  7. GRB 171010B: Swift-XRT observations
  8. GRB 171013A: TAROT Calern observatory optical observations
  9. GRB 171013A: Swift detection of a possible burst
  10. GRB 171011A: Swift-BAT refined analysis
  11. Konus-Wind observation of GRB 171011B
  12. GRB 171010A: Swift/UVOT Detection
  13. Konus-Wind observation of GRB 171010A
  14. GRB 171010A: ePESSTO NTT spectroscopic redshift
  15. GRB 171010A: NOT optical observations
  16. GRB 171010B: Fermi GBM detection
  17. IPN Triangulation of GRB 171011B (long/very bright)
  18. GRB 171010B: Swift ToO observations
  19. GRB 171011A: TAROT Calern observatory optical observations
  20. GRB 171010B: Swift detection of a burst
  21. GRB 171011A: MASTER-SAAO optical observations
  22. GRB 171011A: Swift detection of a burst
  23. GRB 171010A: Fermi GBM observation
  24. GRB 171010A: LCO 1m telescope observations
  25. GRB171010A: AstroSat CZTI detection
  26. GRB 171010A: Swift-XRT afterglow detection
  27. GRB 171010A: optical observations
  28. GRB 171010A: OT, spectrum, and possible host galaxy
  29. GRB 171010A: Swift ToO observations
  30. GRB 171010A: Fermi-LAT detection
  31. LIGO/Virgo G298048/GW170817: updated localization from parameter estimation
  32. LIGO/Virgo G298048: Mid-Infrared Spitzer/IRAC Observations at 3.6 and 4.5 microns
  33. GRB 171007A: Swift-BAT refined analysis
  34. GRB 171007A: Fermi GBM observation
  35. GRB 171007A: Enhanced Swift-XRT position
  36. GRB 171007A: Swift-XRT refined Analysis
  37. GRB 171007A: RATIR Optical and NIR Observations
  38. GRB 171007A: Swift detection of a burst
  39. LIGO/Virgo G298048: LWA radio observations
  40. GRB 171004A: Swift-BAT refined analysis
  41. GRB 171004A: Correction to RATIR Astrometry and Photometry
  42. GRB 171004A: Swift-XRT refined Analysis
  43. GRB 171004A: Enhanced Swift-XRT position
  44. LIGO/Virgo G299232: SWASP optical imaging coverage
  45. GRB 171004A: RATIR Optical and NIR Observations
  46. GRB 170710A: LCO Observations
  47. GRB 171004A: Swift detection of a burst
  48. GRB 171003A: Enhanced Swift-XRT position
  49. LIGO/Virgo G299232: MAGIC Cherenkov Telescopes observations
  50. Swift Trigger 775946 is a Galactic transient, not GRB 171003
  51. LIGO/Virgo G299232: LOFAR follow-up
  52. GRB 171003A: LT early optical observations
  53. GRB 171003A: Swift detection of a burst or a Galactic Transient
  54. GRB 171001A: RATIR Optical and NIR Observations
  55. GRB 171001A: Swift-BAT refined analysis
  56. GRB 171001A: Swift-XRT refined Analysis
  57. GRB 171001A: Swift/UVOT Detection
  58. GRB171001A: D50 optical limit
  59. GRB 171001A: Enhanced Swift-XRT position
  60. GRB 170921A: 15 GHz upper limits from AMI
  61. GRB 170903A: 15 GHz upper limits from AMI
  62. GRB 170906C: 15 GHz upper limits from AMI
  63. GRB 170823A: 15 GHz upper limits from AMI
  64. GRB 170822A: 15 GHz upper limits from AMI
  65. GRB 171001A: Swift detection of a burst
  66. LIGO/VIRGO G299232: AMI-LA Observations of the optical transient Swift J014008.5+343403.6
  67. Fermi Gamma-ray Burst Monitor trigger 528508320/170930994 is not a GRB
  68. Fermi Gamma-ray Burst Monitor trigger 528330888/170929011 is not a GRB
  69. 3.6m Devasthal Optical Telescope observations of GRB 170428A
  70. Further Swift-XRT observations of IceCube 170922A
  71. LIGO/Virgo G298048: Record of all e-MERLIN results to date on SSS17a
  72. LIGO/Virgo G298048: Further European VLBI Network (EVN) observations of SSS17a
  73. LIGO/Virgo G299232/GW170825: serendipitous XMM-Newton slew observations
  74. LIGO/Virgo G298936/GW170823: serendipitous XMM-Newton slew observations
  75. LIGO/VIRGO G298048: VLA detection of the radio counterpart at 6 GHz
  76. LIGO/Virgo G297595/GW170814: updated localization from parameter estimation
  77. LIGO/VIRGO G298048: Further MeerKAT observations of SSS17a
  78. GRB 170728B: Kottamia R-band observation
  79. LIGO/Virgo G298048: Summary of Pi of the Sky observations
  80. IceCube-170922A: Swift-XRT observations
  81. LIGO/VIRGO G298048: Latest 3 GHz Detection of Radio Counterpart to SSS17a
  82. LIGO/Virgo G298048: Limits from further FRB searches of SSS17a
  83. LIGO/Virgo G298048: MWA Observations of Error Region
  84. Konus-Wind observation of GRB 170921B
  85. IceCube-170922A: HAWC follow-up
  86. Search for counterpart to IceCube-170922A with ANTARES
  87. GRB 170921B: AstroSat CZTI detection
  88. GRB 170906A: Insight-HXMT detection
  89. LIGO/Virgo G298048: Effelsberg 100-m Radio Telescope observations of SSS17a
  90. GRB 170921C: Insight-HXMT detection
  91. IPN Triangulation of GRB 170921B
  92. INTEGRAL SPI-ACS observation of AMON IceCube-170922A
  93. IceCube-170922A - IceCube observation of a high-energy neutrino candidate event
  94. GRB 170921A: RATIR Optical Afterglow Detection and NIR Observations
  95. LIGO/Virgo G298048: SRT observations of SSS17a in NGC 4993
  96. GRB 170921A: Swift/UVOT Upper Limits
  97. GRB 170921A: Swift-BAT refined analysis
  98. GRB 170918A: Insight-HXMT detection
  99. GRB 170921A: LCO 2m telescope observations
  100. GRB 170921A: NOT optical observations

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