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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"

32569 results found.

  1. GRB 260516D: LCO optical observations
  2. GRB 260515A: further Liverpool Telescope observations
  3. GRB 260516D: SVOM/COLIBRÍ (FM-GFT) optical observations
  4. GRB 260516D: GTC/OSIRIS+ spectroscopic redshift z = 1.801
  5. GRB 260516D: GROWTH-India Telescope optical detection
  6. GRB 260516D: SVOM/VT optical bright candidate
  7. GRB 260515A: CrAO ZTSh BVRI optical observations
  8. Fermi GRB 260516C: Global MASTER-Net observations report
  9. Konus-Wind detection of GRB 260515A
  10. GRB 260515A: Liverpool Telescope optical detection
  11. GRB 260515A: LCO optical counterpart detection
  12. GRB 260515A: SVOM/COLIBRÍ (FM-GFT) optical observations
  13. GRB 260515A: EP-FXT follow-up observation
  14. EP260514a: refined analysis of the EP-WXT and follow-up EP-FXT observations
  15. EP260514a: NOT optical counterpart confirmation
  16. EP260514a: TRT optical counterpart candidate
  17. EP260514a: SVOM/VT optical candidate
  18. Fermi GRB 260516B: Global MASTER-Net observations report
  19. GRB 260515A: SVOM/VT optical observations
  20. GRB 260515A: OHP/T193 optical observations
  21. EP260514a: COLIBRÍ optical upper limits
  22. GRID detection of GRB 260507A
  23. GRB 260515A: GTC/OSIRIS+ spectroscopic redshift z = 0.764
  24. GRB 260515A: LCO optical observations
  25. SVOM GRB 260515A: Global MASTER-Net observations report
  26. GRB 260515A: NOT optical observations.
  27. SVOM GRB 260515A: MASTER OT J151044.43+243321.7 optical counterpart detection
  28. GRB 260515A: SVOM/VT optical candidate from VHF data
  29. GRB 260515A: JinShan optical counterpart candidate
  30. GRB 260510C: Glowbug gamma-ray detection
  31. IceCube-260504A: No Candidate Transients from the Zwicky Transient Facility
  32. EP260514a: GROWTH-India Telescope optical upper limit
  33. GRB 260511B: NOT optical observations
  34. Konus-Wind detection of GRB 260512A
  35. GRB 260510C: CALET Gamma-Ray Burst Monitor detection
  36. GRB 260511B: GMG Optical Upper Limit
  37. EP260514a: Global MASTER-Net observations report
  38. EP260512a: LCO optical upper limits
  39. IPN triangulation of GRB 260512A
  40. GRB 260511B: Mephisto multi-band optical followup
  41. Fermi GRB 260514A: Global MASTER-Net observations report
  42. GRB 260512A: AstroSat CZTI detection
  43. EP260512a: EP-FXT follow-up observation
  44. EP260507a: Xinglong Schmidt optical counterpart detection
  45. EP260512a: Global MASTER-Net observations report
  46. Fermi GRB 260513A: Global MASTER-Net observations report
  47. Fermi GRB 260512A: Global MASTER-Net observations report
  48. GRB 260511B: further SAO RAS optical observations
  49. GRB 260509A: SVOM/VT optical observations
  50. Konus-Wind detection of GRB 260511B
  51. EP260512a: COLIBRÍ optical upper limits
  52. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  53. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  54. GRB 260512A: NuSTAR detection of prompt emission
  55. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  56. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  57. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  58. GRB 260511A: Glowbug gamma-ray detection
  59. Konus-Wind detection of GRB 260511A
  60. MASS-Cube (GRID 2.0) detection of GRB 260511A
  61. MASS-Cube (GRID 2.0) detection of GRB 260507A
  62. GRB 260511B: SAO RAS optical observations
  63. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  64. GRB 260511B: FRAM-ORM optical detection
  65. GRB 260511A: EP-FXT follow-up observation
  66. GRB 260511B: EP-FXT follow-up observation
  67. GRB 260511B: LCO optical counterpart detection
  68. GRB260511B: MAO/AZT-22 optical observations
  69. GRB 260511A: SVOM/VT optical observations
  70. GRB 260511B: LCO optical observations
  71. GRB 260511B: OHP/T193 spectroscopic observations
  72. GRB 260511B: GOTO optical counterpart detection
  73. GRB 260511B: Xinglong 2.16m/BEFOSC redshift confirmation
  74. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) further optical observations
  75. GRB 260511B: SVOM/VT optical observations
  76. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  77. GRB 260510B: EP-FXT follow-up observation
  78. GRB 260511B: OSIRIS+/GTC redshift z=2.006
  79. GRB 260510C: Fermi GBM Observation
  80. GRB 260509A: SAO RAS optical observations
  81. GRB 260511A: REM near-infrared detection
  82. GRB 260511B: GROWTH-India Telescope optical observations
  83. GRB 260511B: AstroSat CZTI detection
  84. GRB 260506B: Glowbug gamma-ray detection
  85. GRB 260506A: Glowbug gamma-ray detection of a short burst
  86. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope
  87. GRB 260511B: NuSTAR detection of prompt emission
  88. GRB 260511A: NuSTAR detection of prompt emission
  89. GRB 260511B: Fermi GBM Detection
  90. GRB 260511B: SVOM/VT optical observation with VHF data
  91. GRB 260511B: TRT optical observation
  92. GRB 260510B: SVOM/ECLAIRs refined analysis
  93. GRB 260511B : MITSuME Akeno optical afterglow candidate detection
  94. GRB 260511A: Fermi GBM Detection
  95. GRB 260511B SVOM/C-GFT optical counterpart detection
  96. EP260509a: LCO optical upper limits
  97. GRB 260511A: UTGO H50 optical afterglow observation
  98. GRB 260510C: AstroSat CZTI detection
  99. GRB 260511B: SVOM detection of a burst
  100. GRB 260510C: EP-FXT follow-up observation

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