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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

16180 results found.

  1. GRB230414B: VIRT Optical Upper Limit
  2. GRB 230414B: Nickel and KAIT telescope optical observations
  3. GRB 230414B: Swift/UVOT Detection
  4. GRB 230414B: Osservatorio Astronomico Nastro Verde - Sorrento: optical observations
  5. VIRT optical transient detection
  6. GRB 230414B: 3.6m DOT Optical observations, slow decay at early epochs
  7. GRB 230307A: iTelescope optical upper limit (likely)
  8. GRB 230414B: Montarrenti Observatory late time optical afterglow detection
  9. GRB 230414B: Lulin 40cm-SLT optical limit
  10. GRB 230414B: Bassano Bresciano Observatory optical observations
  11. GRB 230414B: AbAO optical observations
  12. GRB 230409B: 3.6m DOT near-infrared detection, afterglow confirmation
  13. GRB 230414B: Dabancheng/GHOST optical observations
  14. GRB 230414B: slow optical light curve decay
  15. GRB 230414B: SAO RAS optical observations
  16. GRB 230414B: 1.3m DFOT Optical observations
  17. GRB 230414B (correction GRB name in the GCN 33615): Mondy optical afterglow candidate
  18. GRB 230414B: Nanshan/HMT optical afterglow detection
  19. GRB 230414A: Mondy optical afterglow candidate
  20. IceCube-230405A: BOOTES-4/MET Optical Upper Limits
  21. GRB 230409B: Mondy optical upper limit
  22. GRB 230409B: OHP/T193 optical upper limit
  23. GRB 230405B: MeerLICHT upper limits
  24. GRB 230405B: Swift/UVOT Upper Limits
  25. GRB 230307A: JWST observations consistent with the presence of a kilonova
  26. GRB 230328B: Multa observatory optical afterglow observation
  27. GRB 230328B: Swift/UVOT Detection
  28. GRB 230328B : GRANDMA/Kilonova-Catcher optical detection
  29. GRB 230328B: 3.6m DOT multiband optical observation
  30. GRB 230328B: Nanshan/NEXT 2nd optical observation
  31. GRB 230328B: Liverpool Telescope afterglow detection
  32. GRB 230328B: OHP/T120 optical observations
  33. GRB 230328B: GIT optical follow-up
  34. GRB 230328B: OASDG optical observations
  35. GRB 230328B: Nanshan/NEXT optical upper limit
  36. GRB 230328B: Mondy, AbAO and Kitab optical observations
  37. GRB 230328B: Mondy optical afterglow confirmation
  38. GRB 230328B: Swift detection of a burst with an optical afterglow
  39. GRB 230325A: Swift/UVOT Upper Limits
  40. GRB 230325A: X-shooter optical afterglow and redshift
  41. GRB 230322B: Swift detection of a burst with optical counterpart
  42. GRB 230314A: TURBO Optical Upper Limit
  43. GRB 230307A: Continued Gemini-South observations confirm rapid optical fading
  44. GRB 230307A: ATCA radio detection
  45. GRB 230307A: INTEGRAL upper limit on Hard X-ray afterglow
  46. GRB 230307A: Swift/UVOT detection
  47. Further improved IPN localization for GRB 230307A
  48. GRB 230307A: SOAR/Goodman detection of the possible host galaxy
  49. TESS Detection of the Optical Afterglow of GRB230307A
  50. GRB 230307A: GECKO optical observations and detections of the afterglow
  51. GRB 230307A: Gemini-South Confirmation of the Optical Afterglow
  52. GRB 230307A: ATLAS information on the ULTRACAM optical afterglow candidate
  53. GRB 230307A: Erratum of the GCN 33441
  54. GRB 230204B: MASTER detection of an object near NTT Optical Afterglow Candidate
  55. GRB 230307A: Possible optical afterglow
  56. GRB 230228A: NUTTelA-TAO / BSTI Optical Limits
  57. GRB 230307A: optical upper limit
  58. GRB 230217A: ATCA rapid-response radio detection
  59. GRB 230307A: Swift/BAT upper limits on the early afterglow
  60. GRB 230228A: VIRT Optical Upper Limit
  61. GRB 230228A: Swift/UVOT Upper Limits
  62. GRB 230228A: OSN optical upper limit
  63. GRB 230228A: Mondy optical upper limit
  64. GRB 230228A: Nanshan/NEXT optical upper limit
  65. GRB 230228A: Miryang Arirang Astronomical Observatory (MAAO) 0.7-m telescope optical upper limit
  66. GRB 230217A: VLT/FORS2 optical observations and candidate counterpart
  67. GRB 230216A Mondy Observations
  68. GRB 230217A: Swift/UVOT Upper Limits
  69. GRB 230216A: Swift/UVOT Upper Limits
  70. GRB 230217A: Continued Gemini Observations
  71. GRB 230217A: Gemini South optical upper limits
  72. GRB 230217A: Gemini-South Optical Observation
  73. IceCube-230217A: BOOTES-4/MET Optical Observations
  74. GRB 230216A: SVOM/C-GFT optical upper limit
  75. GRB 230204B: Lowell Discovery Telescope Observations
  76. GRB 230216A: Zadko observatory - Gingin optical observations
  77. GRB 230204B: ATCA radio detection
  78. GRB 230205A: 6 GHz VLA observations
  79. GRB 221009A: Continued Swift Observations
  80. GRB 230204B: MASTER early OT detection
  81. ZTF23aabmzlp/AT2023azs: Neil Gehrels Swift Observatory X-ray observations
  82. GRB 230204B: LCOGT Optical Upper Limits
  83. GRB 230204B: Swift/UVOT Upper Limits
  84. GRB 230205A: Swift/UVOT Upper Limits
  85. GRB 230205A: LCOGT Optical Upper Limits
  86. GRB 230204B: Swift-XRT afterglow detection
  87. GRB 230204B: 3.6m DOT optical observation
  88. GRB 230205A: SVOM/C-GFT optical upper limit
  89. GRB 230205A: OHP/T193 optical observations
  90. GRB 230204B: VLT/X-shooter redshift
  91. GRB 230204B: ATLAS detection of the optical afterglow and a projected location in a nearby galaxy group
  92. GRB 230205A: BOOTES-5/JGT early optical upper limit
  93. IceCube-230201A: BOOTES-4/MET Optical Upper Limits
  94. GRB 230204B: GIT discovery of the likely optical afterglow
  95. GRB 230204A: Swift/UVOT Upper Limits
  96. GRB 230204A/Swift J1552.8-5055: LCOGT Optical Counterpart Candidate
  97. GRB 230201B: TURBO Optical Upper Limits
  98. ZTF23aabmzlp/AT2023azs: Lulin 1m LOT optical observations
  99. ZTF23aabmzlp/AT2023azs: VLA radio detection
  100. ZTF23aaarlti/AT2023avj: AMI-LA radio detection

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