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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.

Advanced Search Examples (click to copy):

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

19712 results found.

  1. IceCube-220317A: MASTER Global Robotic Net optical observations
  2. GRB 220306B: Swift/UVOT Upper Limits
  3. GRB 220311A: MITSuME Akeno optical upper limits
  4. GRB 220310A: K-800 of Terskol observatory optical upper limit
  5. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  6. Konus-Wind detection of GRB 220310A
  7. GRB 220310C: Swift ToO observations
  8. GRB 220310A: GIT confirmation of optical afterglow.
  9. GRB 220306B: Nanshan/NEXT optical upper limit
  10. GRB 220310A: Swift ToO observations
  11. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  12. GRB 220308B: Fermi GBM detection
  13. MAXI GRB220310.02: Global MASTER-Net observations report
  14. IceCube-220306A: No significant detection in HAWC
  15. IceCube-220303A: No significant detection in HAWC
  16. ZTF22aabjpxh/AT2022cva: AMI-LA radio observation
  17. CALET Gamma-Ray Burst Monitor detection of GRB 220308A and its possible precursor
  18. IPN triangulation of GRB 220308A (long / very bright)
  19. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  20. GRB 220306B: Tautenburg observations
  21. GRB 220306B: AbAO optical observations, possible afterglow candidate
  22. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  23. GRB 220306B: Enhanced Swift-XRT position
  24. GRB 220306B: Swift detection of a burst
  25. GRB 220305A: Enhanced Swift-XRT position
  26. GRB 220305A: Swift-XRT observations
  27. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  28. GRB 220302A: Swift/UVOT Upper Limits
  29. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  30. Swift resumes autonomous slewing
  31. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  32. GRB 220302A: Enhanced Swift-XRT position
  33. GRB 220302A: Swift afterglow detection
  34. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  35. IPN triangulation of GRB 220222A
  36. GCN Circ.draft on GRB 220222A
  37. GRB 220219B: Swift ToO observations
  38. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  39. ZTF22aabjpxh/AT2022cva: GMOS-N spectroscopy
  40. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  41. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  42. Swift GRB220218.94: Global MASTER-Net observations report
  43. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  44. ZTF22aaajecp: GIT optical follow-up observations
  45. ZTF22aaajecp/AT2022cmc: GMOS-N spectroscopy
  46. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  47. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  48. IPN triangulation of GRB 220211A (short)
  49. GRB 210919A: Maidanak optical observations
  50. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  51. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  52. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  53. Konus-Wind detection of GRB 220203A
  54. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  55. GRB 220130A: Fermi GBM Observation
  56. IPN triangulation of GRB 220128A (long)
  57. IPN triangulation of GRB 220124A
  58. GRB 220117A, GROND observations
  59. GRB 220117A: Terskol and AbAO optical upper limits
  60. GRB 220118A: TARGET optical upper limit
  61. GRB 220117B: TARGET optical upper limit
  62. IPN triangulation of GRB 211226A
  63. GRB 220118A: COATLI Optical Observations
  64. GRB 220101A: KAO optical-R observation
  65. GRB 211221A: No V & R detection, KAO telescope
  66. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  67. GRB 220118A: Swift/UVOT Detection
  68. Konus-Wind observation of the recent SGR 1935+2154 activity
  69. GRB 220118A: GIT optical observations
  70. GRB 220118A: Enhanced Swift-XRT position
  71. GRB 220118A: MITSuME Akeno optical observation
  72. GRB 220117B: z-band limit
  73. GRB 220118A: Swift detection of a burst with an optical counterpart
  74. GRB 220117A: MITSuME Akeno optical upper limits
  75. GRB 220117B: Swift/UVOT Upper Limits
  76. GRB 220117A: Swift/UVOT Upper Limits
  77. GRB 220117A: VLT/X-shooter optical afterglow and redshift
  78. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  79. GRB 220117A: Swift-XRT refined Analysis
  80. AMON IC_HAWC NuEm-220116A: No neutrino counterpart detected with ANTARES
  81. GRB 220117B: Nanshan/NEXT optical upper limit
  82. GRB 220117B: MITSuME Akeno optical upper limits
  83. GRB 220117B: Enhanced Swift-XRT position
  84. GRB 220117A: Enhanced Swift-XRT position
  85. GRB 220117B: Swift detection of a burst
  86. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  87. GRB 220117A: Swift detection of a burst
  88. Fermi trigger No 663923149: Global MASTER-Net observations report
  89. GRB 220107A: SAO RAS optical observations
  90. GRB 220107A: further SAO RAS optical observations
  91. GRB 220101A: Additional Liverpool telescope photometry
  92. GRB 220107A: 6m BTA spectroscopic redshift
  93. GRB 220107A: SAO RAS optical observations
  94. GRB 220107A: AbAO and Terskol optical observations
  95. GRB 220107B: MITSuME Akeno optical upper limits
  96. GRB 220107B: Nanshan/NEXT optical upper limits and host galaxy candidate
  97. GRB 220107A: Nanshan/NEXT optical observations
  98. GRB 220107A: Swift/UVOT Detection
  99. GRB 220107A: MITSuME Akeno optical observation
  100. GRB 220107B: Swift-XRT afterglow detection

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