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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"

16288 results found.

  1. GRB 150910A: Chuguev observatory optical observations
  2. GRB 150911A: MITSuME Okayama upper limits
  3. GRB 150910A: VLA Detection
  4. GRB 150910A: continued SAO RAS optical observations
  5. GRB 150910A: TSHAO optical observations
  6. GRB 150910A: NOT observations of the afterglow
  7. GRB 150910A: GROND observation of the afterglow
  8. GRB 150910A: MITSuME Ishigakijima Optical Observation
  9. GRB 150910A: SAO RAS optical photometry
  10. GRB 150910A: Kast spectroscopy from 3m Shane telescope
  11. GRB 150910A: Nanshan optical observations
  12. GRB 150910A: MITSuME Okayama Optical Observation
  13. GRB 150910A: LCOGT FTN afterglow observations
  14. GRB 150910A: KAIT Optical Afterglow Detection
  15. GRB 150910A: Swift detection of a burst with an optical afterglow
  16. Short GRB 150906B: proximity to NGC 3313 galaxy group
  17. GRB150907A: Swift/UVOT observations
  18. GRB 150907B: MASTER-SAAO early optical observations
  19. GRB 150818A: TSHAO and SAO RAS optical observations
  20. ANTARES neutrino detection: CAHA photometry & spectroscopy of the Swift source
  21. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  22. ANTARES neutrino detection and Swift/XRT counterpart: GMG observation
  23. GRB 150902A: Swift/UVOT Upper Limits
  24. ANTARES neutrino detection: Optical/NIR spectroscopy of the Swift/XRT counterpart candidate from NOT
  25. GRB 150902A: MASTER-SAAO optical observations
  26. GRB 150831B: Swift/UVOT Upper Limits
  27. GRB 150831B: MASTER-IAC early optical observations
  28. GRB 150831A: Swift/UVOT Upper Limits
  29. GRB 150831A: optical upper limit ISON-SSO
  30. GRB 150818A: possible SN rise in light curve of Mondy observations
  31. GRB 150821A: LCOGT Siding Springs early observations
  32. GRB 150821A: LCOGT Sutherland observations
  33. GRB 150821A: GROND afterglow observations
  34. GRB 150819A: Mondy and TSHAO optical upper limits
  35. GRB 150818A: continued Mondy optical observations
  36. GRB 150821A: VLT/X-shooter redshift
  37. GRB 150821A: Swift detection of a burst with an optical afterglow
  38. GRB 120729A: KAIT Optical Observations
  39. KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
  40. GRB 150818A: Mondy optical observations
  41. GRB150819A: NOT imaging
  42. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  43. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  44. GRB 150818A: Mondy optical observations
  45. GRB 150818A: MITSuME Ishigakijima upper limits
  46. GRB 150819A: RATIR Optical Observations
  47. GRB 150818A: MITSuME Akeno optical upper limits
  48. GRB 150819A: MASTER-IAC early upper limit
  49. GRB 150819A: Swift/UVOT Upper Limits
  50. GRB150818A: NOT imaging
  51. GRB 150817A: AAO optical observations
  52. GRB 150817A: LCOGT observations
  53. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  54. GRB 150817A: P60 Observations
  55. GRB 150817A: Swift/UVOT Upper Limits
  56. GRB 150817A: Continued RATIR Observations, Revised Candidate
  57. GRB 150817A: RATIR Optical Afterglow Candidate
  58. GRB 150811A: Continued RATIR Observations
  59. GRB 150811A: Continued RATIR Observations
  60. GRB 150811A: KAIT Refined Analysis
  61. GRB 150811A: VLA Detection
  62. GRB 150811A: Continued RATIR Observations
  63. GRB 150811A: Swift/UVOT further observations
  64. GRB 150811A: SAO RAS optical observations
  65. GRB 150811A: P60 Observations
  66. GRB 150811A: LCOGT-McDonald afterglow detection
  67. GRB 150811A: Swift/UVOT Detection
  68. GRB 150811A: KAIT optical candidate
  69. GRB 150811A: RATIR Optical Afterglow Detection
  70. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  71. GRB 150728A: TNG optical observations
  72. GRB 150801B: Swift/UVOT Upper Limits
  73. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  74. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  75. GRB 150424A: HST imaging
  76. GRB 150728A: Continued RATIR Optical Observations
  77. GRB 150728A: TSHAO optical observations
  78. GRB 150728A: RATIR Optical Observations
  79. GRB 150727A: Continued RATIR Optical Observations - Fading
  80. GRB 150728A: AAO optical observations
  81. GRB 150728A: Swift/UVOT Upper Limits
  82. GRB 150727A: RATIR Optical Observations
  83. GRB 150727A: Watcher optical upper limit
  84. GRB 150724B: Continued RATIR Optical Observations
  85. GRB 150727A: Swift detection of a burst with an optical counterpart
  86. GRB 150724B: RATIR Optical Observations
  87. Swift 650221/IGR J00291+5934: Liverpool Telescope observations
  88. Swift Trigger 650221 / IGR J00291+5934: MASTER-IAC OT observations
  89. Swift IGR J00291+5934: MASTER Optical flare detection
  90. GRB 150724A: Swift/UVOT Upper Limits
  91. GRB 150722A: Swift/UVOT Upper Limits
  92. GRB 150720A: Swift/UVOT Upper Limits
  93. GRB 150716A: KAIT Optical Upper Limit
  94. GRB 150711A: Burakan-ISON optical observations
  95. GRB 150716A: Swift/UVOT Upper Limits
  96. GRB 150716A: Continued RATIR Optical Observations
  97. GRB 150716A: P60 Candidate Optical Afterglow
  98. GRB 150716A: RATIR Optical Observations
  99. GRB 150711A: Swift/UVOT Upper Limits
  100. GRB 150711A: Observations from the 2.5m NOT

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