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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"

2271 results found.

  1. GRB 240712A: Swift/UVOT Upper Limits
  2. GRB 240713B: AstroSat CZTI detection of a long burst
  3. Fermi GRB 240422A: Global MASTER-Net observations report
  4. GRB 240225B: Glowbug gamma-ray detection
  5. Fermi trigger No 726774492: Global MASTER-Net observations report
  6. GRB 240102C: AstroSat CZTI detection
  7. GRB 230815A: ATCA detection of radio counterpart
  8. GRB 230524A: AstroSat CZTI detection
  9. GRB 230321B: AstroSat CZTI detection
  10. GRB 230307A: Detection by GRBAlpha
  11. GRB 221009A: Detection by GRBAlpha
  12. GRB 220730A: Swift/UVOT Upper Limits
  13. Konus-Wind detection of GRB 220627A
  14. GRB 220518A: Swift/UVOT Detection
  15. Swift GRB210731.93: Global MASTER-Net observations report
  16. Fermi trigger No 647805873: Global MASTER-Net observations report
  17. GRB 210323A: Swift/UVOT Upper Limits
  18. GRB 210318B: Swift/UVOT Upper Limits
  19. GRB 201001A: Swift/UVOT Upper Limits
  20. GRB 200906A: Swift/UVOT Upper Limits
  21. Fermi GRB 200702A: Global MASTER-Net observations report
  22. Fermi trigger No 606263732: Global MASTER-Net observations report
  23. Swift GRB200306.95: Global MASTER-Net observations report
  24. LIGO/Virgo S191216ap: MASTER optical observation
  25. LIGO/Virgo S191216ap: Upper limits from Fermi-GBM Observations
  26. LIGO/Virgo S191216ap: Identification of a GW compact binary merger candidate
  27. LIGO/Virgo S190828j : No significant candidates in TAROT-GRANDMA observations
  28. Fermi trigger No 581645543 Global MASTER-Net observations report
  29. GRB 181203A: Swift/UVOT Upper Limits
  30. LIGO/Virgo G298048: Effelsberg 100-m Radio Telescope observations of SSS17a
  31. LIGO/Virgo G275697: Further Swift-XRT sources
  32. GRB 170208A: Swift/UVOT Upper Limits
  33. GRB 161219B: Swift/UVOT Detection
  34. GRB 160521B: Swift/UVOT Upper Limits
  35. GRB 160412A: Swift/UVOT Upper Limits
  36. GRB 150720A: Swift/UVOT Upper Limits
  37. GRB 150626A: Swift/UVOT Upper Limits
  38. GRB 150615A: Swift/UVOT Detection
  39. GRB 150301B: X-shooter spectroscopy
  40. GRB 150101A: Swift/UVOT Upper Limits
  41. GRB 140829A: Fermi GBM Detection
  42. GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB
  43. GRB 120514A: Swift/UVOT Upper Limits
  44. GRB 120324A: Swift/UVOT Upper Limits
  45. GRB 120211A: Swift/UVOT Upper Limits
  46. GRB 120118B: Swift/UVOT Upper Limits
  47. GRB 120116A: Swift/UVOT Upper Limits
  48. GRB 111211A: Detection of the SN with the 10.4m GTC
  49. GRB 100901A: MASTER optical flare at 420s discovery
  50. GRB 100816A: MASTER Optical Limits
  51. GRB 090407: Swift UVOT Upper Limits
  52. GRB 081226B: Fermi GBM observation
  53. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  54. GRB 071112C: Optical and NIR data observed with KANATA
  55. GRB 071010B: Keck/LRIS Spectroscopy
  56. Swift/UVOT Observations of GRB070707
  57. Konus-Wind observation of GRB 061222A
  58. GRB 060403: Refined analysis of the Swift-BAT burst
  59. GRB 060218/SN 2006aj, high resolution spectra
  60. GRB 051111: Further spectroscopic analysis
  61. GRB050915: Swift/UVOT upper limits
  62. GRB 050721A: Early Swift XRT analysis results
  63. GRB 050509B: WSRT Radio Observations
  64. Type Ic SN2003L (SN/GRB?), optical spectrum
  65. SN2002ap (SN/GRB?) Echelle spectra
  66. GRB 001109 X-ray afterglow with BeppoSAX
  67. GRB000418, UBVRI field photometry update
  68. GRB 000418, UBVRI field photometry
  69. Late-time HST/STIS Observations of GRB 990510
  70. Late Afterglows of GRBs 990510, 990123
  71. IRAS 18119-1342 and the possible new SGR

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