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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"

16293 results found.

  1. GRB 161214B: NOT optical observations, possible counterpart
  2. GRB 161214A: NOT observations of the afterglow
  3. GRB 161214A: GROND afterglow observations
  4. GRB 161214A: TAROT Calern observatory optical observations
  5. GRB 161214A: fading optical afterglow candidate with the LT
  6. GRB 161129A: NOT optical observations and candidate host galaxy
  7. MASTER: Optical Blazar Flare Detection during Fermi trigger 502272781 inspection
  8. GRB 161202A: RATIR Optical and NIR Observations
  9. GRB 161202A: Swift/UVOT Upper Limits
  10. GRB 161202A: MITSuME Okayama upper limits
  11. GRB 161129A: Mondy optical observations
  12. GRB 161129A: ISON/UAFO optical observations
  13. GRB 160821B: HST detection of the optical and IR counterpart
  14. GRB 161129A: MITSuME Okayama Optical Observation
  15. GRB 161129A: Tautenburg Ic-band observations
  16. GRB 161129A: TSHAO optical observations / possible afterglow+host galaxy
  17. GRB 161117A: SMARTS optical/IR afterglow observations
  18. GRB 161117A iTelescope observation
  19. GRB 161117A: MASTER-OAFA (Argentina) prompt OT observations
  20. GRB 161117A: TAROT La Silla observatory optical observations
  21. GRB 161117A: GMG observation limit
  22. GRB 161117B: Swift/UVOT Upper Limits
  23. GRB 161117B: LCO optical observations
  24. GRB161117A: REM optical and NIR afterglow detection
  25. GRB 161117A: VLT/X-shooter spectroscopy and redshift
  26. GRB 161117A: Swift detection of a burst with an optical counterpart
  27. GRB 161113A: Swift/UVOT Upper Limits
  28. GRB 161113A: Kuban State University optical upper limit
  29. GRB 161113A: RATIR Optical and NIR Observations
  30. GRB 161109A: Swift/UVOT Upper Limits
  31. GRB 161104A: Magellan imaging and spectroscopy
  32. GRB 161108A: continued TSHAO optical observations
  33. GRB 161104A: Chandra X-ray observations
  34. GRB 161108A: MITSuME Okayama upper limits
  35. GRB 161108A: TSHAO optical observations
  36. GRB 161108A: Swift/UVOT Upper Limits
  37. GRB 161105A: Swift/UVOT Upper Limits
  38. GRB 161108A: TAROT Calern observatory optical observations
  39. GRB 161105A: TAROT La Silla observatory optical observations
  40. GRB 161108A: NOT redshift
  41. GRB 161108A: NOT candidate afterglow
  42. GRB 161104A: Gemini South optical observations
  43. GRB 161105A: MASTER-IAC early optical observations
  44. GRB 161104A: Swift/UVOT Upper Limits
  45. IceCube-161103: MASTER follow-up observations
  46. GRB 161023A: GROND Observations
  47. GRB 161023A: TAROT La Silla observatory optical observations
  48. GRB 161023A: Zadko observatory - Gingin optical observations
  49. GRB 161023A: Watcher optical observations
  50. GRB 161023A: LCOGT-FTS optical observations
  51. GRB 161023A VLT/X-shooter redshift
  52. GRB 161023A (Integral trigger 7613) MASTER-Net bright OT detection
  53. GRB 161022A: RATIR Optical and NIR Observations
  54. GRB 161022A: Swift/UVOT Upper Limits
  55. GRB 161022A: NOT optical observations
  56. GRB 161022A: TAROT Calern observatory optical observations
  57. GRB 161017A: LT optical observations
  58. GRB161017A optical R band observations with SARA-RM
  59. GRB 161017A: TNG spectroscopy and redshift confirmation
  60. GRB 161017A: GTC additional spectroscopy and refined redshift
  61. GRB 161017A: Lomonosov Gamma Ray and MASTER Optical prompt observations
  62. GRB161017A: optical observations with 1-m LCOGT McDonald
  63. GRB 161017A: TNG optical observations
  64. GRB 161017A: MITSuME Akeno Optical Observation
  65. GRB 161014A: Continued RATIR Optical and NIR Observations
  66. GRB 161015A: Swift/UVOT observations
  67. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  68. GRB161017.74 MASTER-Net OT detection
  69. GRB 161014A: VLT/X-shooter redshift confirmation
  70. GRB 161014A: refined analysis of TSHAO optical observations
  71. GRB 161014A: RATIR Optical and NIR Observations
  72. GRB 161014A: TNG optical observations
  73. GRB 161014A: AROMA-N Optical Observation
  74. GRB 161014A: Continued MITSuME Akeno Optical Observation
  75. GRB 161014A: Swift/UVOT Detection
  76. GRB161014A: NOT optical observations
  77. GRB 161014A: TSHAO optical observations
  78. GRB 161011A: RATIR Optical and NIR Observations
  79. GRB 161014A: Kanata optical observation
  80. GRB 161014A : Xinglong TNT optical observation
  81. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  82. GRB 161014A: MITSuME-Akeno optical observation
  83. GRB 161011A: Swift/UVOT Upper Limits
  84. GRB 161007A: NOT optical observations
  85. GRB 161007A: AbAO optical observations
  86. GRB 161007A: Mondy optical observations
  87. GRB 161007A: Swift/UVOT Upper Limits
  88. GRB 161004A: Maidanak optical observations
  89. GRB 161004A: refined analysis of TSHAO optical observations
  90. GRB 161007A: MASTER-net early optical observations
  91. GRB 160821A: Maisoncelles observatory optical observations
  92. GRB 160925A: Kottamia R-band observation
  93. GRB 160927A: GTC observations
  94. GRB 150302A: late-time imaging and optical afterglow confirmation
  95. GRB 161004B: Swift/UVOT Upper Limits
  96. GRB 161004A: RATIR Optical and NIR Observations
  97. GRB 161004A: SAO RAS optical upper limit
  98. GRB 161004A: Bassano Bresciano Observatory upper limit
  99. GRB 161004A: TSHAO optical observations
  100. GRB 161004A: Swift detection of a burst with a possible optical counterpart

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