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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"

19722 results found.

  1. GRB 220325A: MASTER Global Robotic Net optical observations
  2. GRB 220325A: Swift detection of a burst
  3. GRB 220319A: GRANDMA observations
  4. GRB 220319A: MITSuME Akeno optical upper limits
  5. GRB220319A: Optical observations from NOT
  6. GRB 220319A: Mondy optical uper limit
  7. GRB 220319A: Enhanced Swift-XRT position
  8. GRB 220319A: Swift detection of a burst
  9. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  10. GRB 220310A: MITSuME Akeno optical observation
  11. IceCube-220317A: MASTER Global Robotic Net optical observations
  12. GRB 220306B: Swift/UVOT Upper Limits
  13. GRB 220311A: MITSuME Akeno optical upper limits
  14. GRB 220310A: K-800 of Terskol observatory optical upper limit
  15. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  16. Konus-Wind detection of GRB 220310A
  17. GRB 220310C: Swift ToO observations
  18. GRB 220310A: GIT confirmation of optical afterglow.
  19. GRB 220306B: Nanshan/NEXT optical upper limit
  20. GRB 220310A: Swift ToO observations
  21. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  22. GRB 220308B: Fermi GBM detection
  23. MAXI GRB220310.02: Global MASTER-Net observations report
  24. IceCube-220306A: No significant detection in HAWC
  25. IceCube-220303A: No significant detection in HAWC
  26. ZTF22aabjpxh/AT2022cva: AMI-LA radio observation
  27. CALET Gamma-Ray Burst Monitor detection of GRB 220308A and its possible precursor
  28. IPN triangulation of GRB 220308A (long / very bright)
  29. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  30. GRB 220306B: Tautenburg observations
  31. GRB 220306B: AbAO optical observations, possible afterglow candidate
  32. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  33. GRB 220306B: Enhanced Swift-XRT position
  34. GRB 220306B: Swift detection of a burst
  35. GRB 220305A: Enhanced Swift-XRT position
  36. GRB 220305A: Swift-XRT observations
  37. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  38. GRB 220302A: Swift/UVOT Upper Limits
  39. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  40. Swift resumes autonomous slewing
  41. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  42. GRB 220302A: Enhanced Swift-XRT position
  43. GRB 220302A: Swift afterglow detection
  44. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  45. IPN triangulation of GRB 220222A
  46. GCN Circ.draft on GRB 220222A
  47. GRB 220219B: Swift ToO observations
  48. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  49. ZTF22aabjpxh/AT2022cva: GMOS-N spectroscopy
  50. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  51. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  52. Swift GRB220218.94: Global MASTER-Net observations report
  53. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  54. ZTF22aaajecp: GIT optical follow-up observations
  55. ZTF22aaajecp/AT2022cmc: GMOS-N spectroscopy
  56. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  57. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  58. IPN triangulation of GRB 220211A (short)
  59. GRB 210919A: Maidanak optical observations
  60. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  61. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  62. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  63. Konus-Wind detection of GRB 220203A
  64. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  65. GRB 220130A: Fermi GBM Observation
  66. IPN triangulation of GRB 220128A (long)
  67. IPN triangulation of GRB 220124A
  68. GRB 220117A, GROND observations
  69. GRB 220117A: Terskol and AbAO optical upper limits
  70. GRB 220118A: TARGET optical upper limit
  71. GRB 220117B: TARGET optical upper limit
  72. IPN triangulation of GRB 211226A
  73. GRB 220118A: COATLI Optical Observations
  74. GRB 220101A: KAO optical-R observation
  75. GRB 211221A: No V & R detection, KAO telescope
  76. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  77. GRB 220118A: Swift/UVOT Detection
  78. Konus-Wind observation of the recent SGR 1935+2154 activity
  79. GRB 220118A: GIT optical observations
  80. GRB 220118A: Enhanced Swift-XRT position
  81. GRB 220118A: MITSuME Akeno optical observation
  82. GRB 220117B: z-band limit
  83. GRB 220118A: Swift detection of a burst with an optical counterpart
  84. GRB 220117A: MITSuME Akeno optical upper limits
  85. GRB 220117B: Swift/UVOT Upper Limits
  86. GRB 220117A: Swift/UVOT Upper Limits
  87. GRB 220117A: VLT/X-shooter optical afterglow and redshift
  88. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  89. GRB 220117A: Swift-XRT refined Analysis
  90. AMON IC_HAWC NuEm-220116A: No neutrino counterpart detected with ANTARES
  91. GRB 220117B: Nanshan/NEXT optical upper limit
  92. GRB 220117B: MITSuME Akeno optical upper limits
  93. GRB 220117B: Enhanced Swift-XRT position
  94. GRB 220117A: Enhanced Swift-XRT position
  95. GRB 220117B: Swift detection of a burst
  96. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  97. GRB 220117A: Swift detection of a burst
  98. Fermi trigger No 663923149: Global MASTER-Net observations report
  99. GRB 220107A: SAO RAS optical observations
  100. GRB 220107A: further SAO RAS optical observations

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