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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"

5541 results found.

  1. LAT GRB240527.59: Global MASTER-Net observations report
  2. Fermi GRB 240527B: Global MASTER-Net observations report
  3. GRB 240527B: Fermi GBM Final Localization
  4. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  5. GRB 240523A: Swift-BAT refined analysis
  6. Fermi trigger No 738348224: Global MASTER-Net observations report
  7. Fermi trigger No 738330463: Global MASTER-Net observations report
  8. LIGO/Virgo/KAGRA S240525p: Identification of a GW compact binary merger candidate
  9. Fermi GBM Sub-Threshold Detection of GRB 240516B
  10. Fermi trigger No 737996942: Global MASTER-Net observations report
  11. GRB 240516B: AstroSat CZTI detection
  12. GRB 240514B: VZLUSAT-2 detection
  13. GRB 240504A: VZLUSAT-2 detection
  14. Fermi trigger No 737788024: Global MASTER-Net observations report
  15. Fermi GRB 240517A: Global MASTER-Net observations report
  16. IPN triangulation of GRB 240514B (short)
  17. GRB 240516A: AstroSat CZTI detection
  18. GRB 240516A: Fermi GBM Observation
  19. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  20. Fermi trigger No 737523389: Global MASTER-Net observations report
  21. GRB 240516A: Swift detection of a burst
  22. Swift GRB240516.15: Global MASTER-Net observations report
  23. MAXI GRB240514.78: Global MASTER-Net observations report
  24. GRB 240514B: GRBAlpha detection
  25. GRB 240514B: Fermi GBM Detection
  26. LIGO/Virgo/KAGRA S240514c: Identification of a GW compact binary merger candidate
  27. GRB 240514B: Fermi GBM Final Real-time Localization
  28. LAT GRB240513.31: Global MASTER-Net observations report
  29. Fermi trigger No 737277727: Global MASTER-Net observations report
  30. Fermi trigger No 737247400: Global MASTER-Net observations report
  31. GRB 240511A : MITSuME Akeno optical upper limits
  32. LIGO/Virgo/KAGRA S240511i: Identification of a GW compact binary merger candidate
  33. LIGO/Virgo/KAGRA S240422ed: GMOS-S photometry of J-GEM24a
  34. Fermi trigger No 736564880: Global MASTER-Net observations report
  35. GRB 240502C: Zeiss-1000 at Koshka observatory observations of GOTO optical counterpart candidates
  36. GRB 240503A: AstroSat CZTI detection
  37. Fermi trigger No 736387941: Global MASTER-Net observations report
  38. LXT 240402A / GRB 240402B: VLT X-shooter redshift of host
  39. Fermi trigger No 736379109: Global MASTER-Net observations report
  40. GRB 240502C: GOTO possible optical counterpart candidates
  41. Fermi GRB 240502B: Global MASTER-Net observations report
  42. Fermi GRB 240502A: Global MASTER-Net observations report
  43. LIGO/Virgo/KAGRA S240422ed: GECKO/KMTNet Transient Candidates
  44. Fermi GRB 240501A: Global MASTER-Net observations report
  45. Fermi trigger No 736197684: Global MASTER-Net observations report
  46. GRB 240408B: VZLUSAT-2 detection
  47. LIGO/Virgo/KAGRA S240501an: Identification of a GW compact binary merger candidate
  48. LIGO/Virgo/KAGRA S240422ed: GRANDMA Optical Upper Limits for EP240426a
  49. LIGO/Virgo/KAGRA S240422ed: Continued Magellan Observations
  50. LIGO/Virgo/KAGRA S240426s: Identification of a GW compact binary merger candidate
  51. LIGO/Virgo/KAGRA S240422ed: Zwicky Transient Facility contuinued observations of S240422ed and candidate analysis
  52. S240422ed: MeerLICHT/BlackGEM photometry on AT2024hfx and archival ZTF detection
  53. LIGO/Virgo/KAGRA S240422ed: Further near-infrared observations with Subaru/MOIRCS by J-GEM Collaboration
  54. LIGO/Virgo/KAGRA S240422ed: Additional DECam GW-MMADS Candidates from the first two nights of observations
  55. LIGO/Virgo/KAGRA S240422ed: Archival BlackGEM/MeerLICHT detections of AT 2024hdr & AT 2024hdq
  56. LIGO/Virgo/KAGRA S240422ed: No significant counterpart candidates in HAWC observations
  57. LIGO/Virgo/KAGRA S240422ed: No significant candidates in GRANDMA/FRAM Observations
  58. LIGO/Virgo/KAGRA S240422ed: ATCA follow-up of candidate counterparts
  59. LIGO/Virgo S240422ed: Swift-XRT detection of 3 possible counterparts
  60. LIGO/Virgo/KAGRA S240422ed: DECam GW-MMADS Candidates
  61. IceCube Alert 240424.08: Global MASTER-Net observations report
  62. LIGO/Virgo/KAGRA S240422ed: SAGUARO upper limits from CSS
  63. LIGO/Virgo/KAGRA S240422ed: Subaru/MOIRCS near-infrared observations by J-GEM Collaboration
  64. LIGO/Virgo/KAGRA S240422ed: No Counterparts in DDOTI/OAN Optical Observations
  65. LIGO/Virgo/KAGRA S240422ed: Zwicky Transient Facility observations and candidates
  66. LIGO/Virgo/KAGRA S240422ed: GW-MMADS DECam observations
  67. LIGO/Virgo/KAGRA S240422ed: Magellan Observations
  68. LIGO/Virgo/KAGRA S240422ed: Updated NED Galaxies in the Localization Volume
  69. LIGO/Virgo/Kagra S240422ed: NED Galaxies in the Localization Volume
  70. Fermi GRB 240422A: Global MASTER-Net observations report
  71. Fermi trigger No 735280430: Global MASTER-Net observations report
  72. Fermi trigger No 735089036: Global MASTER-Net observations report
  73. Fermi GRB 240417A: Global MASTER-Net observations report
  74. Improved IPN triangulation of GRB 240411A
  75. GRB 240415A: SAO RAS optical observations
  76. Fermi GRB 240415A: Global MASTER-Net observations report
  77. Fermi trigger No 734754044: Global MASTER-Net observations report
  78. IPN triangulation of GRB 240411A
  79. GRB 240414A : OHP/T193 redshift determination
  80. LIGO/Virgo/KAGRA S240413p: Global MASTER-Net observations report
  81. LIGO/Virgo/KAGRA S240413p: Zwicky Transient Facility observations
  82. LIGO/Virgo/Kagra S240413p: NED Galaxies in the Localization Volume
  83. IceCube Alert 240412.23: Global MASTER-Net observations report
  84. GRB 240408B: GRBAlpha detection
  85. EP240408A: MASTER optical observations
  86. Swift Trigger 1220736: detection of 4U 1543-62.
  87. Fermi GRB 240408A: Global MASTER-Net observations report
  88. Fermi GRB 240407A: Global MASTER-Net observations report
  89. Fermi-LAT gamma-ray observations of IceCube-240327B
  90. Fermi-LAT gamma-ray observations of IceCube-240327A
  91. GRB 240331A: GRBAlpha detection
  92. GRB 240403B: Glowbug gamma-ray detection
  93. GRB 240403A: Glowbug gamma-ray detection
  94. IceCube-240327B: GRANDMA observations of 4FGL J0555.9+0030
  95. GRB 240403A: Fermi GBM Detection
  96. LXT 240402A: MASTER optical observations with AGN in error-box
  97. GRB 240402B: GWAC-F50A optical upper limit
  98. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  99. Fermi trigger No 733808041: Global MASTER-Net observations report
  100. Fermi GRB 240402A: Global MASTER-Net observations report

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