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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"

16235 results found.

  1. GRB 220521A: ISON-Castelgrande observatory optical observations
  2. GRB 220521A: MITSuME Akeno optical upper limits
  3. GRB 220521A: Gemini Observations
  4. GRB 220521A: REM optical/NIR upper limits
  5. GRB 220521A: LCO Optical Detection
  6. GRB 220521A: Sintesz-Newton/CrAO optical upper limit
  7. GRB 220521A: RATIR Optical and NIR Observations
  8. GRB 220521A: Swift/UVOT Upper Limits
  9. GRB 220521A: SAO RAS optical observations
  10. GRB 220521A: NOT spectroscopic redshift
  11. GRB 220521A: NOT optical afterglow detection
  12. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  13. GRB 220514A: MITSuME Akeno optical observation
  14. GRB 220514A: GRANDMA Optical Afterglow Observations
  15. GRB 220514A: KAIT Optical Afterglow Confirmation
  16. GRB 220514A: MeerLICHT optical afterglow candidate
  17. GRB 220427A: MeerLICHT afterglow observations
  18. GRB 220511A: BOOTES-2/TELMA optical upper limit
  19. GRB 220506A: MITSuME Akeno optical upper limits
  20. GRB 220506A: GIT optical upper limit.
  21. GRB 220506A: BOOTES-5/JGT optical upper limit
  22. IceCube-220405B - ZTF19aavnpjv unrelated
  23. GRB 220430A: Nanshan/NEXT optical upper limit
  24. GRB 220430A: Nanshan/HMT optical upper limit
  25. GRB 220430A: GIT optical upper limits
  26. GRB 220427A: LCO Optical Observations
  27. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  28. GRB 220501A: BOOTES-1 optical upper limit
  29. GRB 220501A: GRANDMA/TJML Optical Observations
  30. GRB 220430A: CAHA 2.2m telescope optical limit
  31. GRB 220430A: GRANDMA observations
  32. GRB 220430A: Mondy and AbAO optical upper limits
  33. GRB 220430A: MeerLICHT optical upper limits
  34. GRB 220427A: VLT/X-shooter photometry
  35. GRB 220427A: Swift detection of a burst with an optical counterpart
  36. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  37. GRB 220412B: Swift/UVOT Upper Limits
  38. GRB 220412B: TNG optical observations
  39. GRB 220412A: GRANDMA observations
  40. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  41. GRB 220412A: BOOTES-network optical upper limits
  42. GRB 220412B: BOOTES-1 optical upper limit
  43. GRB 220412A: RATIR Observations of the Fading Afterglow
  44. GRB 220408A: HCT optical upper limit
  45. GRB 220412B: GIT optical upper limit
  46. GRB 220412A: MITSuME Akeno optical upper limits
  47. GRB 220412B: MITSuME Akeno optical upper limits
  48. GRB 220412A: Swift/UVOT Upper Limits
  49. GRB 220408A: GRANDMA observations
  50. GRB 220408A: Lowell Discovery Telescope Optical Observations
  51. GRB 220408A: RATIR Optical and NIR Observations
  52. GRB 220403B: 1.3m DFOT Optical upper limit
  53. GRB 220408A: 1.3m DFOT Optical upper limit
  54. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  55. GRB 220408A: NOT optical observations and archival detection
  56. GRB 220408A: LCO Optical Afterglow Detection
  57. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  58. GRB 220408A: GIT optical upper limit
  59. GRB 220408A: Xinglong-2.16m optical upper limit
  60. GRB 220408A: KAIT Optical Observations
  61. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  62. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, SAO RAS, CrAO)
  63. GRB 220403B: Mondy optical upper limit
  64. GRB 220403B: 1.5m OSN optical observation
  65. GRB 220403B: Kitab optical observations
  66. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  67. GRB 220403B: Fermi GBM detection
  68. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  69. GRB 220403A: Tautenburg observations
  70. GRB 220403B: optical detection by D50
  71. GRB 220403B: Swift detection of a burst with an optical counterpart
  72. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  73. GRB 220325A: Swift/UVOT Upper Limits
  74. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, TSHAO, AbAO)
  75. GRB 220325A: LCO Optical Upper Limits
  76. GRB 220325A: 1.3m DFOT Optical upper limit
  77. GRB 220325A: MASTER Global Robotic Net optical observations
  78. GRB 220319A: MITSuME Akeno optical upper limits
  79. GRB220319A: Optical observations from NOT
  80. GRB 220319A: LCO Optical Upper Limit
  81. GRB 220319A: Mondy optical uper limit
  82. GRB 220319A: MASTER Global Robotic Net optical observations
  83. GRB 220310A: MITSuME Akeno optical observation
  84. IceCube-220317A: MASTER Global Robotic Net optical observations
  85. GRB 220315A: MASTER Global Robotic Net optical observations
  86. GRB 220306B: Swift/UVOT Upper Limits
  87. GRB 220311A: MITSuME Akeno optical upper limits
  88. IPN triangulation of GRB 220310A
  89. GRB 210722A: TAROT Reunion observatory optical light curve
  90. GRB 210222B: TAROT Reunion observatory optical light curve
  91. GRB 201021C: TAROT Reunion observatory optical light curve
  92. GRB 220310A: K-800 of Terskol observatory optical upper limit
  93. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  94. Integral GRB220311.69: Global MASTER-Net OT detection
  95. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  96. GRB 220310A: GIT confirmation of optical afterglow.
  97. GRB 220306B: Nanshan/NEXT optical upper limit
  98. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  99. GRB 220310A: MASTER optical counterpart detection
  100. GRB 220306B: Mondy optical observations, confirmation afterglow candidate

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