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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"

16277 results found.

  1. GRB 150910A: MITSuME Okayama Optical Observation
  2. GRB 150910A: LCOGT FTN afterglow observations
  3. GRB 150910A: KAIT Optical Afterglow Detection
  4. GRB 150910A: Swift detection of a burst with an optical afterglow
  5. Short GRB 150906B: proximity to NGC 3313 galaxy group
  6. GRB150907A: Swift/UVOT observations
  7. GRB 150907B: MASTER-SAAO early optical observations
  8. GRB 150818A: TSHAO and SAO RAS optical observations
  9. ANTARES neutrino detection: CAHA photometry & spectroscopy of the Swift source
  10. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  11. ANTARES neutrino detection and Swift/XRT counterpart: GMG observation
  12. GRB 150902A: Swift/UVOT Upper Limits
  13. ANTARES neutrino detection: Optical/NIR spectroscopy of the Swift/XRT counterpart candidate from NOT
  14. GRB 150902A: MASTER-SAAO optical observations
  15. GRB 150831B: Swift/UVOT Upper Limits
  16. GRB 150831B: MASTER-IAC early optical observations
  17. GRB 150831A: Swift/UVOT Upper Limits
  18. GRB 150831A: optical upper limit ISON-SSO
  19. GRB 150818A: possible SN rise in light curve of Mondy observations
  20. GRB 150821A: LCOGT Siding Springs early observations
  21. GRB 150821A: LCOGT Sutherland observations
  22. GRB 150821A: GROND afterglow observations
  23. GRB 150819A: Mondy and TSHAO optical upper limits
  24. GRB 150818A: continued Mondy optical observations
  25. GRB 150821A: VLT/X-shooter redshift
  26. GRB 150821A: Swift detection of a burst with an optical afterglow
  27. GRB 120729A: KAIT Optical Observations
  28. KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
  29. GRB 150818A: Mondy optical observations
  30. GRB150819A: NOT imaging
  31. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  32. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  33. GRB 150818A: Mondy optical observations
  34. GRB 150818A: MITSuME Ishigakijima upper limits
  35. GRB 150819A: RATIR Optical Observations
  36. GRB 150818A: MITSuME Akeno optical upper limits
  37. GRB 150819A: MASTER-IAC early upper limit
  38. GRB 150819A: Swift/UVOT Upper Limits
  39. GRB150818A: NOT imaging
  40. GRB 150817A: AAO optical observations
  41. GRB 150817A: LCOGT observations
  42. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  43. GRB 150817A: P60 Observations
  44. GRB 150817A: Swift/UVOT Upper Limits
  45. GRB 150817A: Continued RATIR Observations, Revised Candidate
  46. GRB 150817A: RATIR Optical Afterglow Candidate
  47. GRB 150811A: Continued RATIR Observations
  48. GRB 150811A: Continued RATIR Observations
  49. GRB 150811A: KAIT Refined Analysis
  50. GRB 150811A: VLA Detection
  51. GRB 150811A: Continued RATIR Observations
  52. GRB 150811A: Swift/UVOT further observations
  53. GRB 150811A: SAO RAS optical observations
  54. GRB 150811A: P60 Observations
  55. GRB 150811A: LCOGT-McDonald afterglow detection
  56. GRB 150811A: Swift/UVOT Detection
  57. GRB 150811A: KAIT optical candidate
  58. GRB 150811A: RATIR Optical Afterglow Detection
  59. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  60. GRB 150728A: TNG optical observations
  61. GRB 150801B: Swift/UVOT Upper Limits
  62. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  63. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  64. GRB 150424A: HST imaging
  65. GRB 150728A: Continued RATIR Optical Observations
  66. GRB 150728A: TSHAO optical observations
  67. GRB 150728A: RATIR Optical Observations
  68. GRB 150727A: Continued RATIR Optical Observations - Fading
  69. GRB 150728A: AAO optical observations
  70. GRB 150728A: Swift/UVOT Upper Limits
  71. GRB 150727A: RATIR Optical Observations
  72. GRB 150727A: Watcher optical upper limit
  73. GRB 150724B: Continued RATIR Optical Observations
  74. GRB 150727A: Swift detection of a burst with an optical counterpart
  75. GRB 150724B: RATIR Optical Observations
  76. Swift 650221/IGR J00291+5934: Liverpool Telescope observations
  77. Swift Trigger 650221 / IGR J00291+5934: MASTER-IAC OT observations
  78. Swift IGR J00291+5934: MASTER Optical flare detection
  79. GRB 150724A: Swift/UVOT Upper Limits
  80. GRB 150722A: Swift/UVOT Upper Limits
  81. GRB 150720A: Swift/UVOT Upper Limits
  82. GRB 150716A: KAIT Optical Upper Limit
  83. GRB 150711A: Burakan-ISON optical observations
  84. GRB 150716A: Swift/UVOT Upper Limits
  85. GRB 150716A: Continued RATIR Optical Observations
  86. GRB 150716A: P60 Candidate Optical Afterglow
  87. GRB 150716A: RATIR Optical Observations
  88. GRB 150711A: Swift/UVOT Upper Limits
  89. GRB 150711A: Observations from the 2.5m NOT
  90. GRB 150710A: Swift/UVOT Upper Limits
  91. GRB 150702A: MASTER-SAAO inspection
  92. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
  93. GRB 150627A: MASTER-SAAO OT Detection
  94. GRB 150627A: Swift/UVOT Detection
  95. GRB 150626B: Swift/UVOT Upper Limits
  96. GRB 150626B: NOT optical upper limits
  97. GRB 150626B: MASTER observations
  98. GRB 150626A: Swift/UVOT Upper Limits
  99. V404 Cyg: MASTER Swift, Integral alert observations
  100. GRB 150616A: Watcher optical upper limit

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