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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"

16319 results found.

  1. GRB 180205A: Xinglong TNT optical observation
  2. GRB 180205A: Nickel telescope optical observations
  3. GRB 180205A: Mondy optical observations
  4. GRB 180205A: VLT/X-shooter redshift
  5. GRB 180205A: GROND detection of the NIR/optical afterglow
  6. GRB 180205A: KAIT optical afterglow confirmation
  7. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  8. GRB 180204A: Swift/UVOT Upper Limits
  9. LIGO/Virgo GW170817: Chandra X-ray Emission Continues to Rise ~156 Days Post-Merger
  10. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of AT2017gfo
  11. GRB 180115A: SEDM Observations
  12. GRB 180115A: Swift/UVOT Detection
  13. GRB 180111A AROMA-N optical observation
  14. GRB 180115A: NOT detection of optical counterpart
  15. GRB 180115A: MITSuME Akeno optical upper limits
  16. GRB 180115A: Swift detection of a burst with an optical counterpart.
  17. GRB 180111A: AbAO optical observations
  18. GRB 180113A: KAIT Optical Observations
  19. GRB 180111A: RATIR Optical and NIR Observations
  20. GRB180111A: Xinglong TNT possible optical detection
  21. GRB 180111A: Swift detection of a burst with an optical counterpart
  22. GRB 180103A: Swift/UVOT Upper Limits
  23. GRB 180102A AROMA-N optical observation
  24. GRB 180102A: TSHAO optical upper limit
  25. GRB 180102A: Swift/UVOT Upper Limits
  26. GRB 180102A: NOT optical observations
  27. GRB 180102A: MASTER-Net robotic report
  28. GRB 171222A: AROMA-N optical observation
  29. GRB 171222A: Nanshan-0.36m optical upper limit
  30. GRB 171222A: Swift/UVOT Upper Limits
  31. GRB 171222A: Nanshan-1m optical afterglow detection
  32. GRB 171205A: SMARTS optical/IR supernova monitoring
  33. GRB 171222A: NOT Optical Afterglow
  34. GRB 171216A: Swift/UVOT Upper Limits
  35. Swift Trigger 797070: KAIT Optical Observations
  36. GRB 171211A iTelescope observation
  37. GRB 171212A/Swift J1935.7+2036: Swift/UVOT Upper Limits
  38. GRB 171212A/Swift J1935.7+2036: TSHAO optical observations
  39. GRB 171211A: Swift/UVOT Upper Limits
  40. GRB 171210A: MASTER-Net optical observations
  41. GRB 171209A: MASTER-Net optical observations
  42. GRB 171209A: Lulin 1m telescope observations
  43. GRB 171205A: MASTER-Net OT recent photometry
  44. GRB 171205A: iTelescope optical observations
  45. GRB 171205A: Mondy optical observations
  46. GRB 171205A: SAO-RAS optical observations
  47. GRB 171205A: VLA detection
  48. GRB 171205A: UKIRT near-IR observations
  49. LIGO/Virgo GW170817: Further Hubble Space Telescope observations
  50. GRB 171205A: TSHAO optical observations
  51. LIGO/Virgo GW170817: Chandra X-ray brightening of the counterpart 108 days since merger
  52. GRB 171205A: Continued Swift/UVOT Observations
  53. LIGO/Virgo G298048: Late-time detection of the X-ray afterglow with Chandra
  54. GRB 171205A: MASTER-SAAO optical observations of unusual OT
  55. GRB 171205A: GROND observations of the optical/NIR transient
  56. GRB 171205A: LCO 1-m telescope observations
  57. GRB 171205A: GMG observations (2nd night)
  58. GRB 171205A: CHILESCOPE optical observations
  59. GRB 171205A: SMARTS optical/IR afterglow observations
  60. GRB 171205A: GOTO detection of the optical counterpart
  61. GRB 171205A: TNG NIR detections
  62. GRB 171205A: LSGT optical afterglow follow-up observation
  63. GRB 171205A: GMG observation
  64. GRB 171205A: RATIR Optical and NIR Observations
  65. GRB 171205A: Swift/UVOT Detection
  66. GRB 171205A: VLT/X-shooter optical counterpart and spectroscopic observations
  67. GRB 171205A: Likely association with low-z spiral galaxy
  68. GRB 171124A: TShAO optical observations
  69. Pan-STARRS follow-up of IceCube-171106A
  70. LIGO/Virgo G299232: LOFAR follow-up
  71. GRB 171123A: TShAO optical upper limit
  72. GRB 171123A: Nanshan-1m optical upper limit
  73. GRB 171123A: RATIR Optical and NIR Observations
  74. GRB 171124A: MITSuME Akeno optical upper limits
  75. GRB 171123A: Swift/UVOT Upper Limits
  76. GRB 171123A: GMG observation limit
  77. GRB 171123A: MITSuME Akeno optical upper limits
  78. GRB 171120A: Xinglong-2.16m optical upper limit
  79. GRB 171120A: Swift/UVOT Upper Limits
  80. GRB171120A: GWAC-F60A upper limit
  81. GRB 171120A: MITSuME Akeno optical upper limits
  82. GRB 171115A: RATIR Optical and NIR Observations
  83. GRB 171115A: MITSuME Okayama optical upper limits
  84. GRB 171115A: MITSuME Akeno optical upper limits
  85. IceCube-171106A: Swift Observations
  86. GRB 171010A: afterglow and SN 2017htp optical observations
  87. GRB 171030A: MASTER OT J034412.48-263556.5 featureless continuum spectrum from Lijiang 2.4m (China) telescope and 2m the Himalayan Chandra
  88. GRB 171010A: possible SN component
  89. AMON ICECUBE EHE 130214 (close by time to Fermi trigger): MASTER early follow-up observations
  90. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  91. LIGO/Virgo G298936: NOT spectroscopy of GWFUNC-17ure
  92. GRB 171010A: VLT spectroscopic identification of the associated SN 2017htp
  93. GRB 171102B: AbAO optical upper limit
  94. GRB 171102B: TShAO optical upper limit
  95. GRB 171102B: Nanshan 0.36m and 0.60m optical upper limits
  96. GRB 171102B: RATIR Optical and NIR Observations
  97. GRB 171102B: MITSuME Akeno optical upper limits
  98. GRB 171102B: Swift/UVOT Upper Limits
  99. Swift Trigger 783893: KAIT Optical Observations
  100. GRB 171027A: KAIT Optical Upper Limit

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