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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20954 results found.

  1. Swift J123205.1-105602: XRT and UVOT observations of soft short burst source
  2. GRB 150101A: Swift/UVOT Upper Limits
  3. Swift-XRT and UVOT follow-up of iPTF14jko (GRB 141230A)
  4. GRB 141229A Swift-BAT observations
  5. GRB 141230A: iPTF Optical Observations and Candidate Afterglow iPTF14jko
  6. GRB 141229A: 1.23m CAHA optical observations
  7. GRB 141229A: Swift-XRT observations
  8. Christmas GRB 141225A: GROND Observations
  9. GRB 141229A Tiled Swift observations
  10. GRB 141225A: TAROT Calern observatory optical observations
  11. GRB 141225A: Swift/UVOT refined analysis
  12. GRB 141225A: very early T60 observations
  13. GRB 141225A: MASTER-SAAO first OT detection
  14. GRB 141225A: Nanshan very early optical observations
  15. GRB 141225A: Redshift from OSIRIS at the 10.4m GTC
  16. GRB 141225A: Optical aftergow confirmation
  17. GRB 141225A: 1.23m CAHA optical observations
  18. GRB 141221A: TAROT La Silla observatory optical observations
  19. Swift XRT and UVOT observations of GRB141222A
  20. GRB 141221A: Continued Skynet PROMPT-CTIO observations
  21. GRB 141221A: Swift/UVOT Detection
  22. GRB 141215A: further Swift-XRT observations and afterglow detection
  23. GRB141221A: GROND Afterglow Detection
  24. GRB 141221A: Skynet PROMPT-CTIO observations of the optical afterglow
  25. GRB 141221A: LCOGT-McDonald optical afterglow observations
  26. GRB141221A: REM afterglow
  27. GRB 141220A: Swift/UVOT Detection
  28. GRB 141220A: Photometry from OSIRIS/GTC
  29. GRB 141220A: LT optical afterglow observations
  30. GRB 141220A: Redshift from OSIRIS at the 10.4m GTC
  31. GRB141220A: 1.23m CAHA I-band observations
  32. GRB 141121A: Keck observations
  33. GRB 141215A: Swift-XRT observations
  34. GRB 141215A Tiled Swift observations
  35. GRB 141212A: Zadko observatory - Gingin optical observations
  36. GRB 141212A: Swift/UVOT Upper Limits
  37. GRB 141212B: Swift/UVOT Upper Limits
  38. GRB 141212A: VLA upper limit
  39. GRB 141212A: extended object within the XRT error circle
  40. GRB 141212A: 1.23m CAHA I-band observations
  41. GRB 141212B: initial Swift/UVOT observations
  42. GRB 141212B: Swift/XRT preliminary localization
  43. GRB 141212A: MASTER early optical observations
  44. GRB 141212A: Skynet R-COP Observations
  45. GRB 141207A: Swift-XRT afterglow candidate detection
  46. GRB 141121A: further VLA observations
  47. GRB141208.63: MASTER OT Detection During the Fermi Error Box inspection
  48. GRB141202A: Discovery Channel Telescope Optical Observations
  49. GRB141207A: Discovery Channel Telescope Optical Observations
  50. GRB 141207A: Swift-UVOT Observations
  51. GRB 141207A: Swift-XRT observations
  52. GRB 141207A Tiled Swift observations
  53. GRB141121A: Discovery Channel Telescope Optical Observations
  54. GRB 141205A: Swift/UVOT Upper Limits
  55. GRB 141205A: Nanshan optical upper limit
  56. GRB 141205A: XRT observations
  57. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  58. GRB 141121A: Mondy optical observations
  59. GRB 141130A: Mondy optical observations
  60. GRB 141202A: Swift XRT observations
  61. GRB 141202A Tiled Swift observations
  62. GRB 141130A: Mondy optical light curve
  63. GRB 141030A: Nanshan very early optical observations
  64. GRB 141121A: Continued RATIR Optical Observations
  65. GRB 141130A: Swift/UVOT Detection
  66. GRB 141130A: Nanshan optical observations
  67. GRB 141130A: Mondy optical observations
  68. GRB 141121A: Continued RATIR Optical Observations
  69. GRB 141121A: Mondy optical observations
  70. GRB 141121A: TSHAO optical observations
  71. GRB 141121A: Continued RATIR Optical Observations
  72. GRB 141121A: RATIR Optical Observations - Errata for GCN 17105
  73. GRB 141121A: Khureltogot optical observations
  74. GRB 141121A: Mondy optical observations
  75. GRB 141121A: SPI-ACS/INTEGRAL observations
  76. GRB 141121A: RATIR Optical and NIR Observations
  77. GRB 141121A: three epochs of SAO RAS optical observations
  78. GRB 141121A: Continued RATIR Optical Observations
  79. GRB 141121A: WSRT radio detection
  80. GRB 141121A: TSHAO optical observations
  81. GRB 141121A: Continued Mondy optical observations
  82. GRB 141121A: Continued RATIR Optical Observations
  83. GRB 141121A: RATIR Optical Observations - Steeper Fading
  84. GRB 141121A: AMI 15 GHz detection
  85. GRB 141121A: RATIR Optical Observations - Fading Again
  86. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  87. GRB 141121A: Mondy optical observations
  88. GRB 141121A: LCO-FTN rebrightening confirmation
  89. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  90. GRB 141121A: AAO optical observations
  91. GRB 141121A: Continued RATIR Optical Observations
  92. GRB 141121A: Swift/UVOT Detections
  93. GRB 141121A: RATIR Optical Observations
  94. GRB 141121A: LCO-FTN observations
  95. GRB 141118A: iPTF Optical Observations
  96. GRB 141121A: GROND Afterglow candidate
  97. GRB 141121A: MAXI/GSC detection
  98. GRB141121A: BOOTES-2/TELMA upper limit
  99. GRB 141109A: further VLA observations
  100. GRB 141104A: further Swift-XRT observations and afterglow candidate

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