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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"

16200 results found.

  1. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  2. GRB 220412B: Swift/UVOT Upper Limits
  3. GRB 220412B: TNG optical observations
  4. GRB 220412A: GRANDMA observations
  5. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  6. GRB 220412A: BOOTES-network optical upper limits
  7. GRB 220412B: BOOTES-1 optical upper limit
  8. GRB 220412A: RATIR Observations of the Fading Afterglow
  9. GRB 220408A: HCT optical upper limit
  10. GRB 220412B: GIT optical upper limit
  11. GRB 220412A: MITSuME Akeno optical upper limits
  12. GRB 220412B: MITSuME Akeno optical upper limits
  13. GRB 220412A: Swift/UVOT Upper Limits
  14. GRB 220408A: GRANDMA observations
  15. GRB 220408A: Lowell Discovery Telescope Optical Observations
  16. GRB 220408A: RATIR Optical and NIR Observations
  17. GRB 220403B: 1.3m DFOT Optical upper limit
  18. GRB 220408A: 1.3m DFOT Optical upper limit
  19. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  20. GRB 220408A: NOT optical observations and archival detection
  21. GRB 220408A: LCO Optical Afterglow Detection
  22. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  23. GRB 220408A: GIT optical upper limit
  24. GRB 220408A: Xinglong-2.16m optical upper limit
  25. GRB 220408A: KAIT Optical Observations
  26. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  27. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, SAO RAS, CrAO)
  28. GRB 220403B: Mondy optical upper limit
  29. GRB 220403B: 1.5m OSN optical observation
  30. GRB 220403B: Kitab optical observations
  31. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  32. GRB 220403B: Fermi GBM detection
  33. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  34. GRB 220403A: Tautenburg observations
  35. GRB 220403B: optical detection by D50
  36. GRB 220403B: Swift detection of a burst with an optical counterpart
  37. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  38. GRB 220325A: Swift/UVOT Upper Limits
  39. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, TSHAO, AbAO)
  40. GRB 220325A: LCO Optical Upper Limits
  41. GRB 220325A: 1.3m DFOT Optical upper limit
  42. GRB 220325A: MASTER Global Robotic Net optical observations
  43. GRB 220319A: MITSuME Akeno optical upper limits
  44. GRB220319A: Optical observations from NOT
  45. GRB 220319A: LCO Optical Upper Limit
  46. GRB 220319A: Mondy optical uper limit
  47. GRB 220319A: MASTER Global Robotic Net optical observations
  48. GRB 220310A: MITSuME Akeno optical observation
  49. IceCube-220317A: MASTER Global Robotic Net optical observations
  50. GRB 220315A: MASTER Global Robotic Net optical observations
  51. GRB 220306B: Swift/UVOT Upper Limits
  52. GRB 220311A: MITSuME Akeno optical upper limits
  53. IPN triangulation of GRB 220310A
  54. GRB 210722A: TAROT Reunion observatory optical light curve
  55. GRB 210222B: TAROT Reunion observatory optical light curve
  56. GRB 201021C: TAROT Reunion observatory optical light curve
  57. GRB 220310A: K-800 of Terskol observatory optical upper limit
  58. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  59. Integral GRB220311.69: Global MASTER-Net OT detection
  60. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  61. GRB 220310A: GIT confirmation of optical afterglow.
  62. GRB 220306B: Nanshan/NEXT optical upper limit
  63. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  64. GRB 220310A: MASTER optical counterpart detection
  65. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  66. GRB 220306B: AbAO optical observations, possible afterglow candidate
  67. GRB 220306B: BOOTES-1 optical upper limit
  68. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  69. GRB 220302A: Swift/UVOT Upper Limits
  70. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  71. GRB 220302A: BOOTES-5/JGT optical upper limit
  72. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  73. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  74. Konus-Wind observation of GRB 220219B
  75. GRB 220219B: Swift-XRT observations
  76. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  77. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  78. ZTF22aabjpxh/AT2022cva: 1.5m OSN optical observation
  79. ZTF22aabjpxh/AT2022cva: Assy optical observations
  80. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  81. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  82. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  83. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  84. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  85. GRB 220218A: BOOTES-5/JGT optical upper limit
  86. ZTF22aaajecp/AT2022cmc: Keck DEIMOS Redshift
  87. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  88. ZTF22aaajecp/AT2022cmc: VLT/X-shooter redshift
  89. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  90. ZTF22aaajecp: GIT optical follow-up observations
  91. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  92. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  93. ZTF22aaajecp/AT2022cmc: VLA radio detection
  94. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  95. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  96. GRB 220210A: 1.5m OSN optical upper limit
  97. GRB 220210A: BOOTES-5/JGT optical afterglow candidate discarded
  98. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  99. GRB 210919A: Maidanak optical observations
  100. IceCube-211208A: the optical observation of the candidate PKS0735+178

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