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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').
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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"

37771 results found.

  1. GRB 181228A: Swift/UVOT Upper Limits
  2. GRB 181228A: TSHAO optical upper limit
  3. GRB 181228A: Fermi GBM observation
  4. IPN Triangulation of GRB 181227A (long)
  5. GRB 181228A: Global MASTER Net OT detection
  6. GRB 181228A: REM NIR detection
  7. GRB 181228A: Enhanced Swift-XRT position
  8. GRB 181225A: CALET Gamma-Ray Burst Monitor detection
  9. GRB 181225A: KAIT Follow-Up Observations with Upper Limit
  10. GRB 181228A: KAIT Optical Upper Limit
  11. GRB 181228A: Swift detection of a burst
  12. GRB 181227A: Fermi GBM detection
  13. GRB 181222B: Swift ToO observations
  14. GRB 181225A: Insight-HXMT/HE detection
  15. GRB 181222A: AstroSat CZTI detection
  16. GRB 181225A: Swift observations and X-ray candidate afterglow
  17. GRB 181225A: Global MASTER Net optical observations
  18. GRB 181225A: Swift ToO observations
  19. GRB 181225A: Fermi GBM detection
  20. GRB 181225A: Fermi-LAT Detection
  21. GRB 181225A: AGILE/MCAL detection of a burst
  22. Konus-Wind observation of GRB 181222A
  23. GRB 181222B: Global MASTER Net observations of short bright Fermi GRB
  24. Konus-Wind observation of GRB 181222B
  25. IPN Triangulation of extremely bright short GRB 181222B
  26. GRB 181224A: Swift-BAT refined analysis
  27. GRB 181224A: Swift detection of a burst
  28. GRB 181222A: CALET Gamma-Ray Burst Monitor detection
  29. GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box.
  30. GRB 181222B : Fermi GBM detection
  31. GRB 181222A: Fermi GBM observation
  32. GRB 181222A: MAXI/GSC detection
  33. GRB 181217A: Insight-HXMT/HE detection
  34. GRB 181213A: Swift/UVOT Observations
  35. GRB 181213A: Mondy optical observations
  36. GRB 181213A: continued TSHAO optical observations
  37. GRB 181213A:Insight-HXMT/HE detection
  38. GRB 181212A:Insight-HXMT/HE detection
  39. Konus-Wind observation of GRB 181212A
  40. GRB 181213A: AbAO optical observations
  41. GRB 181213A: HMM-0.5m, NEXT-0.6m, CNEOST-1m optical observations
  42. GRB 181213A: NOT optical observations
  43. GRB 181213A: Swift-XRT refined Analysis
  44. GRB 181213A: Enhanced Swift-XRT position
  45. IPN Triangulation of GRB 181212A (long)
  46. GRB 181213A: Swift-BAT refined analysis
  47. GRB 181213A: GWAC-F60A upper limit
  48. GRB 181126A: MeerKAT radio observation
  49. GRB 181213A : TSHAO optical observations
  50. GRB181213A: Swift/UVOT Detection
  51. GRB 181213A: Swift-XRT observations
  52. GRB 181213A: BOOTES-5/JGT optical observations
  53. GRB 181213A: Swift detection of a burst
  54. GRB 181212A: Fermi GBM Detection
  55. GRB 181126B: KAIT Follow-Up Observations of a Fermi Short GRB (Trigger 564897175)
  56. GRB 181201A: continued optical observations in Mondy
  57. MASTER OT J063515.49-624002.9 of Fermi trigger 565936249: optical observations in SAAO
  58. MASTER: OTs detection during Fermi alert trigger 565936249 early observations
  59. GRB 181201A: VLA detection
  60. GRB 181201A: ALMA detection of a fading mm afterglow
  61. GRB 181203A: GROND detection of the afterglow
  62. GRB 181126B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 564897175)
  63. GRB 181201A: continued optical observations in TSHAO and Chilesope
  64. GRB 181203A: BOOTES-3/YA optical observations
  65. GRB 181205A: a long GRB detected by INTEGRAL
  66. GRB 180112B: AstroSat CZTI detection
  67. Fermi-GBM Observations During Four New GW-Detected BBH Mergers (Correction)
  68. GRB 181201A: continued optical observations in TSHAO
  69. Fermi-GBM Observations During Four New GW-Detected BBH Mergers
  70. GRB 181203A: Swift/UVOT Upper Limits
  71. GRB 181201A: Continued GROND observations show that afterglow is still bright
  72. GRB181201A: GOTO optical observations
  73. GRB 181203A: Swift-XRT refined Analysis
  74. GRB 181201A: AstroSat CZTI detection
  75. GRB 181203A: Swift-BAT refined analysis
  76. GRB 181201A: Swift/UVOT Detection
  77. GRB 181202A: Swift/UVOT Detection
  78. GRB 181201A: continued optical observations in SAAO and Chilesope
  79. GRB 181202A: RATIR Optical and NIR Observations
  80. Konus-Wind observation of GRB 181201A
  81. GRB 181203A: Enhanced Swift-XRT position
  82. GRB 181203A: Swift detection of a burst
  83. GRB 181201A: Further COATLI Optical Monitoring
  84. GRB 181201A: Insight-HXMT/HE detection
  85. GRB 181202A: Global MASTER-Net optical observations
  86. GRB 181202A: Swift-BAT refined analysis
  87. GRB 181201A: VLT/FORS2 tentative spectroscopic redshift
  88. GRB 181202A: Swift-XRT refined Analysis
  89. GRB 181201A: GROND detection of the afterglow and redshift upper limit of z < 3
  90. GRB 181201A: optical observations in Chilescope observatory
  91. GRB 181201A: Global MASTER-Net prompt optical descovery and afterglow observations
  92. GRB 181202A: Enhanced Swift-XRT position
  93. GRB 181202A: Swift detection of a burst with an optical counterpart
  94. GRB 181201A: COATLI Optical Detection
  95. GRB 181201A: Fermi-LAT detection
  96. GRB 181201A: Zeiss-1000/CrAO optical observations
  97. GRB 181201A: NOT optical observations
  98. GRB 181201A: optical observations in SAAO
  99. GRB 181201A MASTER-Net OT continued observation
  100. GRB 181201A: iTelescope optical afterglow detection

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